MIL-STD-1553B-Notice4 - NOTE: Notice 4 , dated 15 January...

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Unformatted text preview: NOTE: Notice 4 , dated 15 January 1996, changes the cover pageof this standard for administrative reasons. t There are no other changeso this document. I INCH-POUND I MILSTD-15538 21 SEPTEMBER 1978 SUPERSEDING MI L-STD-1553A 30 APRIL 1975 DEPARTMENT OF DEFENSE INTERFACE STANDARD FOR DIGITAL TIME DIVISION COMMAND/RESPONSE MULTIPLEX DATA BUS AMSC NIA i DISTRIBUTION STATEMENTA. Approved for public release; distributions unlimited. AREA MCCR Supersedes cover pageof MIL-STD-l553B, dated 21 September 1978 --`,,``,-`-`,,`,,`,`,,`--- Provided by IHS No reproduction or networking permitted without license from IHS Not for Resale DEPARTMENT OF DEFENSE Washington DC 20360 DIGITAL TIME DIVISION COMMAND/RESPONSE MULTIPLEX DATA US B 1. This standardi approved for use by all Departments and Agencies f the Department of Defense. s o 2. Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: ASC/ENSI, Bldg 125, 2335 Seventh Street, Suite 6, Wright-Patterson AFB OH 45433-7809 by using the Standardization Document Improvement Proposal (DD Form 1426) appearing at the endthis document or by letter. of Supersedes pagei i of MIL-STD-15538, dated 21 September 1978. Provided by IHS No reproduction or networking permitted without license from IHS --`,,``,-`-`,,`,,`,`,,`--- Not for Resale - MIL-STD-1553B N O T I C E 2 M C m 7777711 0 0 2 g 8 5 9 3 z m MIL-STD-15538 8 S eptember 1 986 FOREWORD T his s tandard contains requirements for a d i g i t a l time d i v i s i o n cOInmnd/ responsemultiplex & ta bus for u se in Bystems i n t e g r a t i o n . m e n w i t h the u se of this s t a n d a r d , d i f f e r e n c e s may e x i s t b etween m ultiplex d ata b uses in d iff e r e n t system applications due t o particular a pplication requirements and t he d e s i g n e r o p t i o n s allowed in this s tandard. The s ystemdesignermustrecognize t h i s f act and design the m u l t i p l e x bus c o n t r o l l e r hardware and software t o accommodate s uch d i f f e r e n c e s . These d esigner selected o ptions must exist t o allow the n e c e s s a r y f l e x i b i l i t y in the d esign of s pecific r m l t i p l e x s y s t e m s in order t o p rovide f or the c o n t r o l mechanism, a rchitectural r edundancy, degradat i o n c o n c e p t and t raffic p a t t e r n s p e c u l i a r t o the s pecific a p p l i c a t i o n r e q u i r e ments. Appendix, Section 30 selects those o ptions which s h a l l be r equiredand further r estricts c e r t a i n p o r t i o n s of the e tandard f or the u s e i n a l l d u a l f or the Army, Navy, and A i r Force. standby redundant applications Provided by IHS No reproduction or networking permitted without license from IHS --`,,``,-`-`,,`,,`,`,,`--- -_ S upersedes p a g e . i i i d ated 1 2 F ebruary 1980. iii Not for Resale Ø MIL-STD-1553B NOTICE 4 15 January1 996 DEPARTMENT OF DEFENSE INTERFACESTANDARD FOR DIGITALTIMEDIVISIONCOMMAND/RESPONSE MULTIPLEX DATA BUS TO ALL HOLDERSOF MIL-STD-1553B: 1. THE FOLLOWING PAGES OF MIL-STD-1553B HAVE BEEN REVISED AND SUPERSEDE THE PAGES LISTED: NEW PAGE Cover Page 1998 January ii DATE 15 January 1996 15 SUPERSEDED PAGE Cover Page i¡ DATE 21 September 1978 1978 September21 2. RETAIN THIS NOTICE AND INSERT BEFORE TABLE OF CONTENTS. 3. Holders of MIL-STD-1553B will verify that page changes and additions indicated above have been entered. This notice page will be retained as a check sheet. This issuance, together with appended pages, is a separate publication. Each notice is tobe retained by stocking points until the military standard is completely revised or cancelled. Custodians: Army - ER Navy - AS Preparing activity: Air Force- 11 AMSC: i DISTRIBUTION STATEMENTA. Approved for public release; distributions unlimited. Provided by IHS No reproduction or networking permitted without license from IHS Not for Resale --`,,``,-`-`,,`,,`,`,,`--- ./ i MIL-STD-3553B V NOTICE 2 MC m 7777733 0 024860 T i MIL-STD-15538 N OTICE 2 8 S eptember 1986 SUPERSEDTNG N OTICE 1 1 2 F ebruary 1980 MILITARY S TANDARD D IGITAL TIME DIVISION COMMAND/RESPONSE MULTIPLEX DATA BUS TO ALL HOLDERS OF MIL-STD-1553B: 1, MAKE THE FOLLOWING PEN A ND N CHANGES: IK Page i D elete t i t l e and s u b s t i t u t e : DATA BUS". "DIGITAL TIME DIVISION CO"AND/RESPONSE MULTIPLEX Page ii D elete t i t l e and s u b s t i t u t e :" D i g i t a l Data Bu6". T ime D ivision Command/Response Multiplex Page 1 P aragraph 1.1, s econd l i n e : Delete "on a i r c r a f t " . Paragraph 1.2, t h i r d l i n e : D elete "an a i r c r a f t " and s u b s t i t u t e "a". P age 3 P aragraph 3.11, f i r s tl i n e ,a f t e r P aragraph 3.12, f i r s t l i n e , a f t e r "Bus c o n t r o l l e r " :I n s e r t "(BC)". ''Bu6 monitor": I nsert "(BM)". P age 21 P aragraph 4 4 3 1 ..., a dd: "No c ombination of RT a d d r e s sb i t s , T /R b i t , subaddress/mode b i t s , and d a t a word count/modecode b i t s of a command word s h a l lr e s u l ti ni n v a l i dt r a n s m i s s i o n s by t h e RT. S ubsequent v a l i d commands s h a l l be properlyrespondedto by t h e RT." P age 30 P aragraph 4 6 . . , ..32 f i r s tl i n e : Delete "Reset d a t a bus' transmitter" and s u b s t i t u t e "Superseding valid commands". Paragraph 4 6 3 2 ..., s econdline: D elete "from e i t h e r d a t a bus" and s u b s t i t u t e "from t h e o t h e r d a t a bus". Page 31 P aragraph 10.2, e i g h t hl i n e : Delete " airborne". --`,,``,-`-`,,`,,`,`,,`--- FSC MCCR DISTRIBUTION STATEMENT A. Approved f o r p u b l i c r elease; d i s t r i b u t i o n is u nlimited Not for Resale Provided by IHS No reproduction or networking permitted without license from IHS , MIL-STD-1553B OTICE N 2 M C W ’777’773L 0 0 2 4 8 6 3 3 MIL-STD-15538 8 .September 1986 2 . TEIL POLWWING PAGES PAGES LISTED: 09, HIL-STD-1553B RAVE BEEN REVISED AND SUPERSEDE TBE SUPERSEDED PAGE N m PAGE DATE 7 DATE iii iV vii Viii viiia 33 8 34 8 35 8 36 8 37 8 38 3 . 4. --`,,``,-`-`,,`,,`,`,,`--- 8 8 8 8 8 21 S eptember S eptember S eptember S eptember September S eptember September iii 12 F ebruary 1986 iV 21 September 1986 vii 21 September 1986 1986 Viii 12 F ebruary 1 986 viiia 12 F ebruary R eprinted Without 33 1978 F ebruary 12 34 1986 September 1986 12 35 F ebruary INITIAL PUBLICATION S eptember 1986 S eptemberPUBLICATION INITIAL 1986 INITIAL PUBLICATION S eptember 1986 1980 1978 1978 1980 1980 Change 1980 1980 RETAIN TBIS NOTICEAND INSERT BEFORE TABLE OF CONTENTS. Holders of MIL-STD-1553B wl v e r i f y t hat p agechangesand il additionsindicated a bovehavebeenentered. This n o t i c e page w i l l be r e t a i n e d as a c heck sheet. This i ssuance,together w i t h a ppendedpages, is a separate p bi a u lc t i o n . Each n o t i c e is t o be r e t a i n e d by s t o c k i n g p o i n t s until t h e m i l i t a r y s t a n d a r d is c ompletely revised of c ancelled. Custodians : Army ER Navy AS A i r Force - - Preparing activity: Air Force 11 - - 11 P roject No. MCCR-O008 ’.. _ f * Provided by IHS No reproduction or networking permitted without license from IHS Not for Resale M IL-STD-25538 N O T I C E 2 M C W 7'77772L 0 02LIBb2 3 W i MIL-STD-9553E NOTICE 1(USAF) 12 Februarv 1980 MILITARY -STANDARD AIRCRAFT INTERNAL TIME DIVISION COMMAND/RESPONSE MULTIPLEX DATA BUS TO ALL HOLDERS OF MIL-STD-1553B. I THE FOLLOWING PAGES OF MIL-STD-1553B HAVE BEEN REVISED AND SUPERSEDE THE PAGES LISTED: ED PAGE NEW iii viii DATE 2 September 1978 1 iii 2S 1 viiieptember 1978 2 1 September 1 978 34 2. 34 THE FOLLOWING NEW PAGES ARE BE INSERTED AS LISTED: TO NEW PAGE viiia 35 3. RETAIN THIS NOTICE PAGE AND INSERT BEFORE THE TABLE OF CONTENTS. 4. Holders of MIL-STD-1553B will verify that page changes indicated above have a been entered. The notice page will be retaineds a check sheet. This issuance, together with appended pages, a separate publication. Each notice is is to be retained by stocking points until the Military Standard is completely revised or cancelled. ,activities, 5. This notice is applicable to all U.S. Air Force aircraft internal avionics : Provided by IHS No reproduction or networking permitted without license from IHS --`,,``,-`-`,,`,,`,`,,`--- i * b Custodian: Air F orce - 11 Preparing activity: Air Force - 1 1 Project MISC-FD32 ... *US. GOVERNMENT PRINTING OFFICE: 1980-603-121/1244 FSC MISC .. Not for Resale M IL-STD-1553B N O T I C E 2 M C W 9 9997LL 0 02Lt863 5 I lUL-GTD-1553B 8 September 1 986 CONTENTS Paragraph 1. 1.1 1 .2 2. 2 *1 3. 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3 .11 3 .12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4. 4 .1 4.2 . 4.3 4.3.1 4.3.2 4.3.3 4.3.3.1 4.3.3.2 4.3.3.3 4.3.3.4 4.3.3.5 4.3.3.5.1 4.3.3.5.1.1 4.3.3.5.1.2 4.3.3.5.1.3 4.3.3.5.1.4 4.3.3.5.1.5 4.3.3.5.1.6 4.3.3.5*1.7 4.3.3.5.1.7.1 Provided by IHS No reproduction or networking permitted without license from IHS Page SCOPE Scope Application REFERENCED DOCUMENTS Issue o Document f DEFINITIONS Bit Bit Rate Pulse Code Modulation ( P M ) Time Division Multiplexing (TDM) Half Duplex Word Message subsystem 1 1 1 * * Data BUS TedMl Bus Controller (BC) B s Monitor ( BM) u Remote Terminal(RT) Asynchronous Operation Dynamic Bus Control Command/Response Redundant Data Bus B&adcas t Mode Code GENER?& R E Q U I R N T S 1 1 1 1 1 1 3 3 3 3 3 3 3 3 3 3 3 3 3 4 4 4 4 4 4 4 4 4 4 4 4 8 8 8 8 8 8 8 8 9 Test and Operating Requirements Data Bus Operation Characteristics Data Form Bit Priority Transmission Method Modulation Data Code Transmission Bit Rate Word Size Word Formats Command Word sync Remote Terminal Address Transmit/Receive Subaddress/Mode Data word Count/Mode Code Parity Optional Mode Control Dynamic Bus Control --`,,``,-`-`,,`,,`,`,,`--- Supersedes page iv dated1 September 1 978. 2 Not for Resale MIL-STD-1553B 21 S eptember 1978 CONTENTS (Cont'd) . J " 4.3.3.5.1.7.2 4.3.3.5.1.7.3 4.3.3.5.1.7.4 4.3.3.5.1.7.5 4.3.3.5.1.7.6 4.3.3.5.1.7.7 4.3.3.5.1.7.8 4.3.3.5.1.7.9 4.3.3.5.1.7.10 4.3.3.5.1.7.11 4.3.3.5.1.7.12 4.3.3.5.1.7.13 4.3.3.5.1.7.14 4.3.3.5.1.7.15 4.3.3.5.1.7.16 4.3.3.5.1.7.17 4.3.3.5.2 4.3.3.5.2.1 4.3.3.5.2.2 4.3.3.5.2.3 4.3.3.5.3 4.3.3.5.3.1 4.3.3.5.3.2 4.3.3.5.3.3 4.3.3.5.3.4 4.5.3.5.3.5 4.3.3.5.3.6 4.3.3.5.3.7 4.3.3.5.3.8 4.3.3.5.3.9 4.3.3.5.3.10 4.3.3.5,3.11 4.3.3.5.3.12 4.3.3.5.4 4.3.3.6 4.3.3.6.1 4.3.3.6.24.3.3.6.3 4.3.3.6.4 4.3.3.6.5 4.3.3.6.6 4.3.3.6.7 4.3.3.6.7.1 4.3.3.6.7.2 4.3.3.6.7.3 4.3.3.6.7.4 4.3.3.7 4.3.3.8 Synchronize(WithoutData Word) T r a n s m i t S t a t u s Word Initiate Self Test T r a n s m i t t e r Shutdown O v e r r i d e T r a n s m i t t e r Shutdown I n h i b i t T/F B i t Override Inhibit TIF B i t R eset Remote Terminal Reserved Mode Codes (01001 t o 01111) T ransmit Vector Word Synchronize(WithData Word) T r a n s m i t L a s t Command Word TransmitBuilt-In-Test ( B I T ) Word S e l e c t e d T r a n s m i t t e r Shutdown Override Selected Transmitter Shutdown Reserved mode Codes (10110 t o 1 1111) D ata Word Sync Data Parity S t a t u s Word Sync RT A ddress Message E r r o r B i t Instrumentation B i t S ervice Request B i t R e s e r v e d S t a t u s B its B roadcast Command Received B i t B usy B i t S ubsystem Flag B i t Dynamic Bus C ontrolAcceptance B i t T erminal Flag B i t Parity B i t S t a t u s Word Reset MessageFormats B us c o n t r o l l e r t o Remote T e r m i n a l T r a n s f e r s Remote T e r m i n a l t o Bus C o n t r o l l e r T r a n s f e r s Remote T e r m it n a l o Remote Terminal Transfers Command Mode Without Word. Data MCommand ode W ith D ata Word (Transmit) Mode Command Wh D ata Word (Receive) i t Broadcast O ptional Command Bus c o n t r o l l e r to R emote TerminalCs) T r a n s f e r( B r o a d c a s t ) Remote T e r m i n a o tl Remote T e r m i n a l ( s 1 T r a n s f e r( B r o a d c a s t ) Mode Command Without Data Word ( B r o a d c a s t ) Mode Command With Data Word ( B r o a d c a s t ) I ntermessage Gap R esponse Time ' 9 9 9 9 9 9 9 9 9 11 11 11 11 11 11 11 11 11 12 12 12 12 12 12 12 12 12 13 13 13 13 13 13 53 Provided by IHS No reproduction or networking permitted without license from IHS --`,,``,-`-`,,`,,`,`,,`--- 13 14 14 14 14 14 14 14 14 1 7 17 1 7 1 7 17 1 I .. Not for Resale PilL-STD-I 553b 21 S e p t e m e r 1976 Paragraph 4 .3.3.9 4 4.4.1 4 .4.1.1 4.4.1.2 4.4.1.3 4.4.2 4.4.3 4 . 4 . j. 1 4.4.3.2 4.4.3.3 4 .4.3.4 4.4.3.5 4.4.3.6 I;. 4.4.4 4 .5 4.5.1 4.5.1.1 4.5.1.2 4.5.1.3 4.5.1.4 4.5.1.5 4.5.1.5.1 4.5.1.5. I . 1 4.5.1.5.1.1.1 G.5.1.5.1.1.2 4.5.1.5.1.1.3 4.5.1.5.1.2 4.5.1.5.1.j 4,5.1.5.1.4 ri.5.1.5.2 4.5.1.5.2.1 4.5.1.5.2.2 4.5.1.5.2.3 4.5. 1 .5.3 4.5.2 4.5.2.1 4.5.2.1.1 4.5.2.1.1.1 4.5.2.1.1.2 4.5.2.1.1.3 4.5.2.1.1.4 4.5.2.1.2 4.5.2.1.2.1 4.5.2.1.2.2 4.5.2.1.2.3 4.5.2.1.2.4 k.5.2.2 4.5.2.2.1 4.5.2.2.1.1 4.5.2.2.1.2 h inimum h o-nesponse l'ime-Out 'terminalOperation Cornmon Ciperatiorl hord V a l i a a t i o n Transmission Continuity Terminalt;ail-Safe b us C o n t r o l l e rO p e r a t i o n herno t e Term i n a l uperation Super sed ing Val i d Commands I n v a l i d Commands l l l e g a l Command ValidLatarieception I n v a l i db a t aR e c e p t i o n E us b a n i t o rO p e r a t i o n h a r a w a r eC h a r a c t e r i s t i c s b a t a b us C h a r a c t e r i s t i c s Cab1e C h a r a c t e r i s t i c s lmpedance ChbleAttenuation Cable lermination CauleStubhequirements IransrorBerLoupleaStuDs m uplir4 ' Iransfornler Iransf'ormer I n p u t I mpedance Transiormerhaveformintegrity l r a n s f o r m e r Lonlmcrl h o d eh e j e c t i o n E a u l ti s o l a t i o n CableCoupling StuoVoltagettequireaents LiircctCoupled S t u b 6 k a u l tl s o l a t i o n LableCoupling S t u b V oltagefiequirements h i r i n g a na C a b 1 i ng f'or h C ' l ~ r m i n a lC h a r a c t e r i s t i c s Terminals h i t h T ransformer CoGplea S t u b s 'ierminal b u t p u t C h a r a c t e r i s t i c s u u t p u t L evels b u t p u t h aveforin b u t p u t MOi s e t i u t p u t Symnroetry Term i n a l I n p u t C haracter i st i c s InputiiavetormCompatiuility Lommon Fad e fte j e c t i o n i n p u t l mpeuance h o i s e he j e c t i o n Terminals k i t h L i r e c t CoupledStubs lerminal ( l u t p u t C h a r a c t e r i s t i c s butputLevels b u t p u t k avefom vi i 17 17 17 21 21 21 21 21 21 21 21 21 22 22 22 22 22 22 22 22 22 Zj 23 r 3 23 . 23 23 23 23 2j 23 25 25 25 25 25 25 25 25 25 25 25 27 27 27 27 27 27 27 25 Provided by IHS No reproduction or networking permitted without license from IHS Not for Resale --`,,``,-`-`,,`,,`,`,,`--- 22 " ~ - MIL-STD-LS53B TICE NO t 2 MC q7777LL 0 024Bbb O MIL-STD-1553B 8 SepterPber 1986 Paragraph . Page Output Uoise OutputGymretry T r i a Input Characteristics em l n Input Waveform Compatibility CoamK>n Mode Rejection Input U p d a n c e N oise Rejection RedundantDataBus Requirements Electrical Isolation Single Event Failures DualStandbyRedundant Data Bus Data BUB A ctivity Superseding Valid Connnands DETAIL REQUIREMENTS 452213 ..... 452214 ..... 45222 .... 452221 ..... 452222 e.... 452223 ..... 452224 ..... 46 . 461 .. 462 .. 463 .. 4631 ... 4632 ... 5 . 29 29 29 29 29 29 29 30 30 30 30 30 30 30 ~ . Supersedes page v i i d a t e d 21 September 1978. Provided by IHS No reproduction or networking permitted without license from IHS vii Not for Resale --`,,``,-`-`,,`,,`,`,,`--- Provided by IHS No reproduction or networking permitted without license from IHS --`,,``,-`-`,,`,,`,`,,`--- MIL-STD-1553B 8 S eptember 1986 CONTENTS ( Cont'd) P aqe FIGURES 1. 2 . 3 . 4 . 5 . 6 . 7 . 8 . 9 . 10. 11. 12. 13. Sample M ultiplex Data Bus A r c h i t e c t u r e Data E ncoding Word F ormats Command and S t a t u s Sync Data Sync Information Transfer Formats Broadcast I nformation Transfer Formats I ntennessage Gap and Response T ime Data Bus I n t e r f a c e Using Trans. C oupling Data B us I n t e r f a c e Using Direct C oupling Coupling Transformer Terminal 1/0 C h a r a c t e r i s t i c s f o r Transformer Coupled and Direct C oupled 2 5 6 7 7 15 16 18 19 20 24 24 26 stubs O utput Waveform TABLES I . II. A ssigned Mode C o d e s C riteria f or A cceptance or R ejection of a T erminal for the Noise R e j e c t i o n Test APPENDIX 10 28 10. 1. 01 1. 02 1. 03 1. 04 1. 05 1. 06 10.7 G eneral Redundancy B s Controller u M z l t i p l e x S e l e c t i o n C riteria High R e l i a b i l i t y Requirements Stubbing Use o B roadcast O ption f Other related documents REFERENCED DOCUMENTS GENERAL REQUIREMENTS Optionselection Application Unique address Mode codes Subaddress/mode R equired mode codes Remote t erminal required d e codes B s c o n t r o l l e r r e q u i r e d mde codes u Reset remote t erminal I n i t i a t e R T s e l f t est 31 31 31 33 33 33 34 34 34 34 34 34 35 35 35 35 35 35 35 . 20. * * * * * * * 30. 3. 01 30.2 3. 03 30.4 3.. 041 3.. 042 3... 0421 3... 0422 3.. 043 3.. 044 ' S upersedes page v i i i d ated 12 F ebruary 1980. viii . Not for Resale ” - flIL-STD-1553B c NOTICE 2 ! C W 9 9999LL O 024868 L I MIL-STD-1553B 8 September 1986 CONTENTS ( Cont’d) Paragraph Page * * * * * * * * * * 30.5 3.. 051 3.. 052 3.. 053 30.6 30.7 3. 08 30.9 30.10 30.10.1 30.10.2 30.10.3 30.10.4 30.10.5 30.10.6 Gtatus word b i t s Information content Gtatus b i t requirements Busy b i t Broadcast Datawrap-around Message formats RT t o RT v alidation Electrical characteristics Cable shielding Shielding Connector polarity Characteristic impedance Stub coupling Power -/off n oise 36 36 36 36 36 37 37 37 37 37 37 37 37 38 38 APPENDIX FIGURES I l l u s t r a t i o n o P ossible Redundancy f I l l u s t r a t i o n o P ossible Redundancy f 32 32 S upersedes page v i i i a dated 12 February 1980. viiia --`,,``,-`-`,,`,,`,`,,`--~~ Provided by IHS No reproduction or networking permitted without license from IHS \ Not for Resale MIL-STD-1553B TICE NO 2 MC 79777LL 0 02LIBb7 b kIL-STD-1553B 21 September 1978 1. SCOPE 1 .1 ScoDe. This standard stablishes equirements or igital, e r fd command/response , time d i v i s i o n m u l t i p l e x i n g ( D a t a b u s ) t e c h n i q u e s o n aircraft. It e ncompasses t h e d a t a b u s l i n e and i t s i n t e r f a c e e l e c t r o n i c s i l l u s t r a t e d o n f i g u r e 1 , a na a l s o d e f i n e s t h e c o n c e p t o f o p e r a t i o n and informationflowonthe m u l t i p l e xd a t a b u s a nd t h 6 e l e c t r i c a l and f u n c t i o n a lf o r m a t st o b e e mployed. 1.2 ADDliCatiOn. hhen invoked i n a s p e c i f i c a t i o n o r s tatementofwork, t hese r e q u i r e m e n t ss h a l la p p l yt o t h e m u l t i p l e x d ata b u s a ndassociateaequipment w hich i s d eveloped e i t h e r a l o n e o r a s a p o r t i o n o f an a i r c r a f t weapon system o r s ubsystemdevelopment. The c o n t r a c t o r i s r e s p o n s i b l ef o ri n v o k i n ga l lt h e applicablerequirementsof t h i s kilitaryStanaardonany and a l l s u b c o n t r a c t o r s he may employ. 2. HEPEHENChD DOCWIENTS --`,,``,-`-`,,`,,`,`,,`--- 2 . 1I s s u e o f d ocument. The f o l l o w i n gd o c u m e n t ,o ft h ei s s u ei n e f f e c t o n d ate o f i n v i t a t i o n f o r b i d o r r e q u e s tf o rp r o p o s a l ,f o r m s a p a r t o f t h e s t a n d a r dt o t he e x t e n t s pecified h e r e i n . S PECIF'lCATION N ILITARY kIL-E-6051 Electromagnetic Compatibility Requirements, Systems by ( Copies o fs p e c i f ' i c a t i o n s ,s t a n d a r d s ,d r a w i n g s and p u b l i c a t i o n s r e q u i r e d c o n t r a c t o r s i n c o n n e c t i o n w i t h s pecific p rocurementfunctionsshould be obtainedfromtheprocuringactivity or a s directed b y t h e c o n t r a c t i n g officer .) 3. DEFINITIONS 3 .1 Contraction f inary ob d i g i t : may b e e i t h e r z ero o r o ne. In information theory a b i n a r y d i g i t i s equal to one binary decision or the d e s i g n a t i o n o f o n e of' t wo p o s s i b l e v a l u e s o r s t a t e s o f a n y t h i n g used t o s t o r e o r conveyinformation. 3.2 b i t rate. m. T he number o f b i t s t r a n s m i t t e d e r e c o n d . ps ( PCh). The form o fm o d u l a t i o ni n ' w h i c h the 3.3Pulsecodemodulation m o d u l a t i o ns i g n a l i s s ampled, q uantizedand coded s o t h a t each e l e m e n to f i n f o r m a t i o n c o n s i s t s o f d i f f e r e n t t y p e s o r n umbers of' p u l s e s and s p a c e s . Time d i v i s i o nr n u l t i o l e x i n n ( TDMl. The t r k s m i s s i o no fi n f o r m a t i o n from s e v e r a ls i g n a ls o u r c e st h r o u g ho n ec o m m u n i c a t i o n s ystem w i t h d i f f e r e n t s i g n a l time t o form a c o m p o s i t ep u l s et r a i n . s a m p l e ss t a g g e r e di n 3.4 3.5 H alf duDleX. O p e r a t i o no f a d a t at r a n s f e rs y s t e mi n e i t h e r d i r e c t i o no v e r a single line, but not in both directions on that line simultaneously, 3.6 parity. m. l n t h i s d ocument a word i s a s equenceof 16 b i t s p l u ss y n c There a r e t hree t ypes words: of c ommand, s t a t u s and d a t a . and Provided by IHS No reproduction or networking permitted without license from IHS Not for Resale MIL-STD-3553B OTICE N 2 M C W 7 777933 0 0 2 q 8 7 0 2 I I MIL-STD-1553B 21 September 1978 i : , i , I Provided by IHS No reproduction or networking permitted without license from IHS --`,,``,-`-`,,`,,`,`,,`--- i +- """_' 1 ._ ". " H k . I T t d I i. Not for Resale t - M I L - S T D - 3 5 5 3 8O T I C E N 2 MC 9 37933L 0 0 2 4 8 7 3 4 I / * I bIIL-STD-1553b 2 1 S eptember 1 978 3 . 7 k essane. A s i n g l e message i s t h et r a n s m i s s i o n o f a command w o r d ,s t a t u s word,and d ata w oras i f t h e y a re s p e c i f i e d . For t h e c ase o f a remote t e r m i n a l t o remoteterminal ( R T t o R T) t r a n s m i s s i o n ,t h em e s s a g e s hall i n c l u d e t h e two cmnrandwords, t h e t wo s t a t u s w o r d s , a n d d ata w ords. 3 . 6 S ubsvstem. The d e v i c e o r f u n c t i o n a lu n i tr e c e i v i n g from t h e d a t a b u s . 3.9 d ata t r a n s f e rs e r v i c e Data b us.hhenever a d ata b u s o r b u s i s r eferred t o i n this d ocument i t s h a l l i mply a l l t h e h ardware i n c l u d i n g t w i s t e d s h i e l d e d pair c ables, i s o l a t i o n r e s i s t o r s , t r a n s f o r m e r s , etc r e q u i r e d t o p r o v i d e a s i n g l e d ata p a t h b etween t h e b u s c o n t r o l l e r and all t he a s s o c i a t e d r e m o t e t e r m i n a l s . ., 3 . I O T erminal. The e l e c t r o n i c module n e c e s s a r y t o i n t e r f a c et h e d ata b u s w i t h t h e s ubsystemand t h e s ubsystem w i t h t h e d a t a b u s . T e r m i n a l s may e x i s t a s s eparate l i n e r e p l a c e a b l e u n i t s t h e s ubsystem. (LRU's) o r b e c o n t a i n e d w i t h i n t h e e l e m e n t s o f t h e t ask o f i n i t i a t i n gi n f o r m a t i o n 3 .11 b u s c o n t r o l l e r . The t e r m i n a l s s i g n e d a transfers o n t h e d a t a b u s . 3 .12 B us m onitor. The t e r m i n a la s s i g n e d t h e t a s k o f r e c e i v i n g b u s t r a f f i c a nd e x t r a c t i n g s elected i n f o r m a t i o n t o b e u sed a t a l a t e r time. 3 .13 Remote t e r m i n a l (HT). or a s a b u s m o n i t o r . A l l t e r m i n a l sn o to p e r a t i n g as t h e bus c o n t r o l l e r 3 .14 A svnchronous oDeration. F or t h e p u r p o s e o f t h i s s t a n d a r d , s y n c h r o n o u s a o p e r a t i o n i s t h e u s e o f an i n d e p e n d e n t c l o c k s o u r c e i n e ach t e r m i n a l f o r message t ransmission. Decoding i s a c h i e v e di nr e c e i v i n g t erminals u s i n g c l o c k i n f o r m a t i o n d e r i v e d from t h e message. 3 .15 D vnamic bus c o n t r o l . The o p e r a t i o n o f a d ata b u ss y s t e mi n a e s i g n a t e d t e r m i n a l s a re o f f e r e d c o n t r o l o f t h e a a t a b u s . w hich 3 . 1 6 Command/HesDonse. O p e r a t i o no f a d ata b u s s ystemsuch t h a t r emote t e r m i n a l s r e c e i v e and transmit d a t a o n l y when c o m a n d e d t o d o s o b y t h e b u s controller. 3 .17 k edundant d ata b us. The use o f m orethanone d ata b u st op r o v i d e ruore t h a n o n e d a t a p ath between t h e s u b s y s t e m s , i . e . , d u a l r e d u n d a n t a a t a b u s , tri-redundant data b u s , etc. 3 .18 B roadcast. C p e r a t i o no f a d ata b u s s ystem s uch t h a t i n f o r m a t i o n t r a n s m i t t e d by t he b u s c o n t r o l l e r o r a r emote terminal i s a ddressed t o m ore t h a no n eo f t h e r emoteterminalsconnected to t h e data bus. 3 .19 h odecode. k means b y w hich t h e b u s c o n t r o l l e r c a n c m u n i c a t e with the m u l t i p l e x ' b u s r elated hardware, i n o r d e r t o a ssist i n t h e m anagement o f i n f o r m a t i o nf l o w . Provided by IHS No reproduction or networking permitted without license from IHS Not for Resale --`,,``,-`-`,,`,,`,`,,`--- MIL-STD-1553B 21 September 1978 4. GElvEIiAL F iEQUIREM3TS 4 .1 T est a n do p e r a t i n nr e a u i r e m e n t s . A r e q u i r e m e n t s a s s pecified h e r e i n l s h a l l b e v a l i d o v e r t h e e n v i r o n m e n t a l c o n d i t i o n s w hich t h e m u l t i p l e x d a t a b us system s h a l l b e r e q u i r e d t o o p e r a t e . 4.2 P ata b u so p e r a t i o n . The m u l t i p l e x d ata b u ss y s t e mi n i ts most e l e m e n t a l c o n f i g u r a t i o n s h a l l b e a s shown on f igure 1The . m u l t i p l e x d a t a b us s y s t e m s h a l l functionasynchronouslyin a c ommand/response mode, a n d t r a n s m i s s i o n s h a l l o c c u r i n a h a l f - d u p l e xm a n n e r .S o l ec o n t r o lo fi n f o r m a t i o nt r a n s m i s s i o n on t h e b u s s h a l l r eside w ith t h e b u s c o n t r o l l e r , w hich s h a l l i n i t i a t e a l l t r a n s m i s s i o n s . The i n f o r m a t i o nf l o wo n t h e d a t a b u s s h a l l b e c o m p r i s e do f messages w hich a r e , i n t u r n , formedby t hree t y p e s o f w ords (command, d a t a , a nd s t a t u s ) a s d e f i n e di n4 . 3 . 3 . 5 . 4C h a r a c t e r i s t i c s .3 4.3.1 p ata f orm. D igital d ata may b e t r a n s m i t t e di na n yd e s i r e df o r m , provided that t h e c hosenform s h a l l b e c ompatible w i t h t h e message a nd word formats d e f i n e di n this s t a n d a r d . Any unused b i t p o s i t i o n s i n a word s h a l l b e transmitted as l o g i c z e r o s . 4.3.2 B i t D r i o r i t y . The m o s ts i g n i f i c a n t b i t s h a l l b e t h e l ess s i g n i f i c a n t b i t s f o l l o w i n g i n d e s c e n d i n g o raer word. The number o f b i t s r e q u i r e d t o d e f i n e a quantity w ith t h e r e s o l u t i o n o r a ccuracy r e q u i r e d . I n t h e e v e n t t r a n s m i t t e d f irst w i t h o f' v a l u e i n t h e d ata shall be consistent that m u l t i p l e p r e c i s i o n quantities(informationaccuracyorresolutionrequiringmorethan 16 b i t s ) a r e t r a n s m i t t e d , t h e m o s t s i g n i f i c a n t b i t s s h a l l b e t r a n s m i t t e d f i r s t , f ollowedby t he w o r d ( s )c o n t a i n i n g t h e l esser s i g n i f i c a n t b i t s i nn u m e r i c a ld e s c e n d i n g o rder. b i t p acking o f m u l t i p l e q u a n t i t i e s i n a s ingle d ata word i s p ermitted. 4 .3.3 Transmission method 4 .3.3.1 Nodulation. The s i g n a l s h a l l b e t ransferred o ver t h e d ata b u s i n s e r i a l d i g i t a l p u l s e code m o d u l a t i o n f o r a . 4.3.3.2 Data c ode. The d ata code s h a l l b e M anchester II b i - p h a s e e v e l . l A l ogic o ne s h a l l b e t r a n s m i t t e d a s a b i p o l a r c o d e ds i g n a l1 / 0 (i.e., a positive p ulse f ollowed by a n e g a t i v e p u l s e ) . A l ogic z e r o s h a l l b e a b i p o l a r coded s i g n a l0 / 1 ( i . e . , a n e g a t i v e p ulse f ollowedby a p o s i t i v ep u l s e ) . A transition t h r o u g h z ero o c c u r s a t t h e m i d p o i n t o f each b i t time ( see f i g u r e 2 ) . 4 .3.3.3Transmission b i t r ate. The t r a n s m i s s i o n b i t r a t e o n t h e b u s s h a l l b e 1 .0 megabit p ersecond w i t h a c ombined a ccuracyand long-term s t a b i l i t y o f 2 0.1ercent p (i.e., 1 000 Hertz ( Hz)). The s hort-term s t a b i l i t y ( i . e . , s t a b i l i t y o v e r 1 .0 s e c o n di n t e r v a l ) s h a l l b e a t l e a s t 0 .01 p e r c e n t ( i . e . , ,+ 1 00 Hz) . 4 .3.3.4 Kord s i z e . The word s i z e s h a l l b e 16 b i t s p l u s t h e s ync waveform and t h e p a r i t y b i t f or a total o f 20 b i t s times a s shown on f igure 3 . 4 .3.3.5 Word f o r m a t s . The word f o r m a t s s h a l l b e a s shown o n f igure 3 f o r t h e command, d a t a , a nd s tatus w ords. --`,,``,-`-`,,`,,`,`,,`--- Provided by IHS No reproduction or networking permitted without license from IHS T Not for Resale 1 MIL-STD-I 5536 2 1 September 1978 L O "-" " " " " O L ! I ""_ """_ F I " " " I l I I I I I l Provided by IHS No reproduction or networking permitted without license from IHS Not for Resale --`,,``,-`-`,,`,,`,`,,`--- MIL-STD-1553B 21 September-1978 -. PARITY rl " T ERMINAL FLAG - rl DYNAMIC CONTROL BUS ACCEPTANCE S UBSYSTEM rl FLAG BUSY " d BROADCAST COMMAND RECEIVED a rl d S ERVICEREQUEST ._ - I NSTRUMENTATION m H Fzr m T i n H na H lW H .. H æ --`,,``,-`-`,,`,,`,`,,`--- Provided by IHS No reproduction or networking permitted without license from IHS Not for Resale f Provided by IHS No reproduction or networking permitted without license from IHS --`,,``,-`-`,,`,,`,`,,`--- + VOLTS O r -1 I I ! I r1 I I - VOLTS I LJ C 4, " J DATA BIT - -/ W ORD SYNC I DATA BIT > FIRURE 4 . Command and status sync. < DATA BIT " c/ TJORD SYNC P DATA BIT FIGURE 5. Data s ync. c Not for Resale 21 S eptember 1978 MIL-STD-1553B Command word. A command word s h a l l be comprised o f a s ync waveform, 4.3.3.5.1 r e m o t et e r m i n a la d d r e s sf i e l d , t ransmit/receive (T/R) bit,subaddress/mode f i e l d , word count/modecodefield,and a p a r i t y ( P ) b i t ( s e e f i g u r e 3). T he command sync waveform s h a l l be a n i n v a l i dM a n c h e s t e r 4.3.3.5.1.1 times, w i t h t h e waveform a s shown o nf i g u r e 4. T h ew i d t hs h a l lb et h r e eb i t b i t t imes, a ndthen sync waveform b e i n g p o s i t i v e f or t h e f i r s t o neandone-half n e g a t i v ef o rt h ef o l l o w i n go n ea n do n e - h a l fb i t times. If t h e n ext b i t f o l l o w i n gt h es y n c waveform i s a l ogic z ero, t h e n t h e l a s t h a l f o f t h e s y n c of two c l o c k p e r i o d s d u e t o theManchester waveform will h a v e a n a p p a r e n t w i d t h encoding. Remote t e r m i n a l d d r e s s . a The n ext f i v e b i t s f ollowing t h es y n c s h a l lb et h e R T a ddress.Each RT s h a l lb ea s s i g n e d a u niqueaddress. Decimal a d d r e s s 3 1 ( 1 1 1 1 1 ) s h a l l n ot b ea s s i g n e d a s a u n i q u ea d d r e s s .I na d d i t i o n to i t s u n i q u ea d d r e s s , a RT s h a l lb ea s s i g n e dd e c i m a la d d r e s s 31 ( 1 1 1 1 1 ) a s t h e common a d d r e s s , i f t h e b r o a d c a s t o p t i o n i s u sed. m. 4.3.3.5.1.2 T r a n s m i t / r e c e i v e . The n ext b i t o l l o w i n g h e f t remote t erminal addressshallbethe T /R b i t , which s h a l l i n d i c a t e t h e a c t i o n r e q u i r e d o f t h e RT. A l o g i c z e r o s h a l l i n d i c a t e t h e RT i s t o r e c e i v e ,a n d a l o g i c one s h a l l i n d i c a t e t h e R T i s t o t ransmit. 4.3.3.5.1.3 S ubaddress/mode. The n ext f i v e b i t sf o l l o w i n gt h e R /T b i t s h a l l b e u t i l i z e d t o i n d i c a t e a n RT s u b a d d r e s s o r use of mode c o n t r o l , a s i s d i c t a t e d by t h ei n d i v i d u a lt e r m i n a lr e q u i r e m e n t s . The subaddress/mode v alues o f O0000 a nd 1 1 1 1 1 a re r e s e r v e d f or s p e c i a lp u r p o s e s , a s s p e c i f i e d i n 4.3.3.5.1.7, a nd shallnotbeutilizedforanyotherfunction. 4.3.3.5.1.4 Data word count/mode code. The n ext f i v e b i t sf o l l o w i n gt h e s u b a d d r e s s / m o d e f i e l d s h a l l be t h e q u a n t i t y o f d a t a words t o b e e i t h e r s ent o u t o r r e c e i v e d by t h e RT o r t h eo p t i o n a l mode code a s s p e c i f i e d i n 4.3.3.5.1.7. A maximum o f 32 d a t a words may b e t r a n s m i t t e d o r r e c e i v e d i n a n y o n e m e s s a g e block. A l l 1's s h a l l i n d i c a t e a d ecimalcount o f 31, a nd a l l O ' s s h a l l i n d i c a t e a d e c i m a l c o u n t o f 32. 4.3.3.5.1.5 4.3.3.5.1.6 t h ep r e c e d i n g p a r i t v . T he l a s t b i t i n t h e word s h a l l be used 1 6 b i t s . Odd p a r i t ys h a l lb eu t i l i z e d . f or p a r i t yo v e r Provided by IHS No reproduction or networking permitted without license from IHS --`,,``,-`-`,,`,,`,`,,`--- O Dtional mode c o n t r o l . For R T ' s e x e r c i s i n gt h i so p t i o n a s ubaddress/modecode o f O0000 o r 1 1 1 1 1 s h a l l i m p l y t h a t t h e c o n t e n t s of t h e command. d a t a wordcount/modecode f i e l d a re t o b edecoded a s a f i v e b i t mode The mode c o d e s h a l l o n l y b e u s e d t o c ommunicatewiththemultiplexbusrelated hardware,and t o a ssist i n t h e management of i n f o r m a t i o n f low, a nd n ot t o e xtract d a t a from o r f e e dd a t at o a f unctionalsubsystem.Codes O0000 t h r o u g h 0 1111 s h a l l o n l y b e u s e d f or mode codeswhichdo n ot r e q u i r e t ransfer o f a d a t a word. For t h e s ec o d e s ,t h e T /R b i t s h a l l be s e t t o 1. C odes 10000 t hrough 1 1 1 1 1 shallonlybeused f or mode c o d e s w h i c h r e q u i r e t r a n s f e r of a s i n g l e d a t a of d a t a word. F or t h e s e mode c o d e s ,t h e T /R b i t s h a l l i n d i c a t e t h e d i r e c t i o n word f l o w a 3 s p e c i f i e d i n 4.3.3.5.1.3. No m u l t i p l e d a t a word t ransfer s h a l l be implementedwithany mode code. The mode codes a re r e s e r v e d f or t h e s p e c i f i c f u n c t i o n s as s p e c i f i e d i n t a b l e I a n ds h a l ln o tb eu s e d f or a n y o t h e r p u r p o s e . If t h e d e s i g n e r c h o o s e s t o i mplementany of t h e s e f u n c t i o n s , t h e s p e c i f i c 4.3.3.5.1.7 8 t Not for Resale M IL-STD-1553B N O T I C 1 . MIL-STD-1553B 21 S eptember 1978 . c o d e s , T /R b i t a ssignments, a nd u se o f a d a t a word, s h a l l beused a s i n d i c a t e d . The u se o f h e r o a d c a s t tb command o p t i o ns h a l lo n l yb ea p p l i e dt op a r t i c u l a r mode codes a s s p e c i f i e d i n t a b l e I . Dvnamic b u sc o n t r o l .T h ec o n t r o l l e rs h a l l i ssue a t ransmit command t o a n RT c a p a b l eo fp e r f o r m i n gt h eb u sc o n t r o lf u n c t i o n .T h i s RT s h a l l r e s p o n dw i t h a s t a t u s word a s s p e c i f i e d i n 4.3.3.5.3. C o n t r o lo ft h ed a t ab u s passesfromtheofferingbuscontrollertotheaccepting RT u poncompletionof s t a t u s word by t h e RT. If t h e RT r e j e c t s c o n t r o l o f t h et r a n s m i s s i o no ft h e t h ed a t ab u s ,t h eo f f e r i n gb u sc o n t r o l l e r r etains c o n t r o l o f t h e d a t a b u s . 4.3.3.5.1.7.1 4.3.3.5.1.7.2 S vnchronize (without word). data This command s h a l l cause t h e RT t o s y n c h r o n i z e ( e . g . , t o r eset t h e i n t e r n a l t imer, t o s tart a s equence, etc.). The R T s h a l l t r a n s m i t t h e s t a t u s word a s s p e c i f i e d i n 4.3.3.5.3. 4.3.3.5.1.7.3 T ransmit s t a t u s word. T h i s command s h a l l cause t h e RT t o t ransmit t h e s t a t u s word a s s o c i a t e d w i t h t h e l a s t v a l i d command word p r e c e d i n g t h i s command. T h i s mode command s h a l l n o t a l t e r t h e s t a t e o ft h e s tatus word. 4.3.3.5.1.7.4 t e s t w i t h i nt h e 4.3'3.5.3. .-RT. T h i s command s h a l l be used t o i n i t i a t e s elf The RT s h a l l t r a n s m i t t h e s t a t u s word as s p e c i f i e d i n 4.3.3.5.1.7.5 T ransmitter shutdown. This command ( t oo n l yb eu s e dw i t hd u a l c ause t h e R T t o d i s a b l e t h e t ransmitter a s s o c i a t e d r e d u n d a n tb u ss y s t e m s )s h a l l R T s h a l l n o t comply w i t h a command t o s h u t down a w i t ht h er e d u n d a n tb u s .T h e t r a n s m i t t e r on thebusfromwhichthis command i s r e c e i v e d . I n a l l c ases, t h e RT s h a l l r e s p o n d w i t h a s t a t u s word a s s p e c i f i e d i n 4.3.3.5.3 a f t e r t h i s command. 4.3.3.5.1.7.6 O v e r r i d e t ransmitter s hutdown. This command ( t o n l y e s e d o bu c ause t h e R T t o e n a b l e a t ransmitter w i t hd u a lr e d u n d a n tb u ss y s t e m )s h a l l w hich was p r e v i o u s l yd i s a b l e d .T h e R T s h a l l n o t comply w i t h a command t o e n a b l e a t ransmitter o n thebusfromwhichthis command i s r e c e i v e d .I n all c ases, t h e R T s h a l l r e s p o n d w i t h a s tatus word a s s p e c i f i e d i n 4.3.3.5.3 a f t e r t h i s command. 4.3.3.5.1.7.7 Inhibit erminal lae: f (T/F! b i t .T h i s command s h a l l cause t h e R T t o s e t t h e T/F b i t i n t h e s t a t u s word s p e c i f i e d i n 4.3.3.5.3 t o l o g i c z e r o u n t i l o t h e r w i s e commanded. The R T s h a l l t r a n s m i t t h e s tatus word as s p e c i f i e d i n 4.3.3.5.3. 4.3.3.5.1.7.8 O v e r r i d ei n h i b i t T/F b i t .T h i s command s h a l l c ause t h e RT t o o v e r r i d et h ei n h i b i t T/F b i t s p e c i f i e d i n 4.3.3.5.1.7.7. The RT s h a l l t r a n s m i t t h e s tatus word a s s p e c i f i e d i n 4.3.3.5.3. 4.3.3.5.1.7.9 P eset r e m o t et e r m i n a l .T h i s command s h a l l be used t o r eset t h e RT t o a p ower up i n i t i a l i z e d s tate. The R T s h a l l f i r s t t ransmit i t s s t a t u s w ord,andthen r eset. 4.3.3.5.1.7.10 R eserved mode codes ( 01001 t o 01111). r e s e r v e d f or f u t u r e u s ea n ds h a l ln o tb eu s e d . T hese mode codes a re 9 --`,,``,-`-`,,`,,`,`,,`--- Provided by IHS No reproduction or networking permitted without license from IHS , Not for Resale . . MIL-STD-L553B N O T I C E 2 MC 79777LL 0 0 2 4 8 7 8 7 W hIL-STD-1553B 2 1 S eptember 1978 TABLE I. A ssigned mode c o d e s Associated Data k ord T /R B i t 1 1 1 1 1 1 1 1 1 1 Mode Code 00000 Function Dynamic bus C ontrol Synchronize T r a n s m i t S tatus k ord . I n i t i a t e S elf Test B roadcast Command Allowed N o No NO O000 1 O001 o O001 1 Yes No No lu0 Yes O0 1O0 O0101 O01 10 O01 11 o1O00 O1001 Transmitter S hutdown O v e r r i d e T r a n s m i t t e r Shutdown I n h i b i t Terminal P l a g b i t O v e r r i d eI n h i b i tT e r m i n a lM a gb i t Heset fiemote Terminal Yes Yes Yes Yes h0 No N o No N o Yes TB D Reserved o1111 1O000 1O001 10010 10011 1o1 O0 1o1 o1 1 or O 1 R eserved TransmitVector Synchronize l'ransmit Last Command Transmit bIT Nord S e l e c t e dT r a n s m i t t e r Shutdown Giord J NO 1 TED 1 Yes Yes Yes Yes Yes No No Yes O v e r r i d eS e l e c t e dT r a n s m i t t e r Shutdown Reserved Yes Yes Yes Tb D 10110 1 or O 11111 1 R eserved ( TBD) J Yes 1 TBD 1 NOTE: To b e determined --`,,``,-`-`,,`,,`,`,,`--- Provided by IHS No reproduction or networking permitted without license from IHS Not for Resale MIL-STD-1553B 21 S eptember 1 976 4.3.3.5.1.7.11 Transmit vector word. T h i s command s h a l l c ause t h e BT t o transmit a s t a t u s word a s s p e c i f i e d i n 4 . 3 . 3 . 5 . 3 and a d a t a word c o n t a i n i n g servicerequestinformation. 4.3.3.5.1.7.12 Svnchronize ( K i t h d ata word). T he hT s h a l lr e c e i v e a command word followedby a d a t a word a s s p e c i f i e di n4 . 3 . 3 . 5 . 2 . T he d ata word s h a l l t h e RT. A fter r e c e i v i n g t h e command c o n t a i ns y n c h r o n i z a t i o ni n f o r m a t i o nf o r a nd d ata w ord, t h e n T s h a l l transmit t h e s t a t u s word a s S p e c i f i e d i n 4 . 3 . 3 . 5 . 3 . 4.3.3.5.1.7.13 Transmit l a s t command word. T h i s command s h a l l c a u s e t h e R T t o t r a n s m i t i t s s t a t u s wora a s s pecified i n 4 . 3 . 3 . 5 . 3 f ollowed b y a s ingle d ata word w hich c o n t a i n s Dits 4-19 o f t h e l a s t command word,excluding a transmit l a s t commana K ord mode c o d e r e c e i v e d b y t h e HT. ' í h i s mode c m a n d s h a l l n o t a l t e r t h e s t a t e o f t h e h l " s s t a t u s word. 4.3.3.5.1.7.14 Transmit built-in-test (&IT) w ord. T h i s command s h a l l c a u s e t h e hT t o transmit i t s s t a t u s word a s s pecified i n 4 . 3 . 3 . 5 . 3 f o l l o w e d by a s i n g l e d ata word c o n t a i n i n g t h e h T E I I ' d afa. T h i s f u n c t i o n i s i n t e n d e a t o supplement t h e a v a i l a b l e b i t s i n t h e s t a t u s wora when t h e FtT hardware i s s u f f i c i e n t l y complex t o warrant i t s u se. The d ata w o r d ,c o n t a i n i n g t h e R T b lT d a t a , s h a l l n o t b e a ltered by t h e r e c e p t i o n o f a t r a n s m i t l a s t command o r a t r a n s m i t s t a t u s word mode code. 'This f u n c t i o n s h a l l n o t b e u sed t o convey B I T d ata f rom t h e a ssociated subsystem( s) . 4 .3.3.5.1.7.15 S elected t r a n s m i t t e r shutdown. T h i s command s h a l l c a u s e h e t RT t o d i s a b l e t h e transmitter a s s o c i a t e d w i t h a s p e c i f i e d r e d u n d a n t d a t a b us. The command i s d e s i g n e d f o r u s e w i t h s ystemsemployingmorethan two redundant b u s e s . The transmitter t h a t i s t o b e d i s a b l e d s h a l l b e i d e n t i f i e d i n t h e d a t a word f o l l o w i n g t h e command word i n t h e f ormat a s s pecified i n4 . 3 . 3 . 5 . 2 . The H T s h a l l n o t comply w i t h a command t o s h u t down a t r a n s m i t t e r o n t h e b u s from w hich t h i s command i s r e c e i v e a . I n a l l c ases, t h e HT s h a l lr e s p o n dw i t h a s t a t u s word a s s pecified i n4 . 3 . 3 . 5 . 3 . 4.3.3.5.1.7.16 Override s elected t r a n s m i t t e r shutdown. T h i s command s h a l l c a u s e t h e h l' t o e n a b l e a t r a n s m i t t e r w hich was p r e v i o u s l y d i s a b l e d , The command i s d e s i g n e d f o r u s e w i t h s ystemsemployingmorethantworedundant buses. The t r a r l s m i t t e r t h a t i s t o b e e nabled s h a l l b e i d e n t i f i e d i n t h e d a t a word f o l l o w i n g t h e command word i n t h e f -ormat a s s p e c i f i e d i n4.3.3.5.2. The lìl' s h a l l n o t comply w i t h a command t o e n a b l e a t r a n s m i t t e r o n t h e b usfrom w hich t h i s command is r e c e i v e d .I n a l l c ases, t h e R T s h a l l r espond w i t h a status word a s s pecified i n4 . 3 . 3 . 5 . 3 . 4.3.3.5.1.7.17 heserved mode codes (10110 t o1 1 1 1 1 ) . r e s e r v e d f or f u t u r eu s ea n d s h a l l n o t b e u sed. 4.3.3.5.2 D ata w ord. A d ata word s h a l l b e c omprisedof b i t s , a nd a p a r i t y b i t ( see f igure 3 ) . These mode c odes a r e a s ync waveform, d ata 4.3.3.5.2.1 m. The d a t a sync waveform s hall b e a ninvalidManchester waveform a s shdwn o n f igure 5 . T he w idth s h a l l b e t h r e e b i t times, w i t h t h e waveform b e i n g n e g a t i v e f o r t he f irst o neanàone-half b i t t imes, a ndthen p o s i t i v e f or t h e f ollowingoneandone-half b i t t imes. N ote t h a t i f t h e b i t s p r e c e d i n g a nd f o l l o w i n g t h e sync a re l o g i c o n e s , t h e n the apparent width o f the s yncwaveform w l b e i n c r e a s e d t o f o u r b i t times. il --`,,``,-`-`,,`,,`,`,,`--- Provided by IHS No reproduction or networking permitted without license from IHS Not for Resale M I L - S T D - 1 5 5 3 BO T I C E N 2 MC 7777711 0 0 2 4 8 8 0 5 M 2 1 S eptember 1978 MIL-STD-1553B 4.3.3.5.2.2 The s i x t e e n b i t s f o l l o w i n g t h e s ync s h a l l b e u t i l i z e d f o r d ata t r a n s m i s s i o n a s s p e c i f i e d i n 4.3.2. &fa. Provided by IHS No reproduction or networking permitted without license from IHS --`,,``,-`-`,,`,,`,`,,`--- 4.3.3.5.2.3 4.3.3.5.1.6. paritv. T he l ast b i t s h a l l b e u t i l i z e d f o r p a r i t y a s s pecified i n 4.3.3.5.3 S t a t u s word. A s t a t u s word s h a l l b ecomprisedof a s yncwaveform, R T a ddress, message e r r o r b i t , i n s t r u m e n t a t i o nb i t ,s e r v i c er e q u e s t b i t , t hree r e s e r v e d b i t s , b r o a d c a s t command r e c e i v e d b i t , busy b i t , s ubsystem f l a g b i t , dynamic bus c o n t r o la c c e p t a n c eb i t ,t e r m i n a l f lag b i t , a nd a p a r i t y b i t . F or o p t i o n a lb r o a d c a s to p e r a t i o n ,t r a n s m i s s i o no f t h e s t a t u s word s h a l l be s u p p r e s s e d a s s p e c i f i e d i n 4.3.3.6.7. 4.3.3.5.3.1 4.3.3.5.1.1. m. T he s t a t u ss y n c waveform s h a l l b e a s s p e c i f i e di n 4.3.3.5.3.2 E. a ddress. T he n e x tf i v eb i t sf o l l o w i n gt h es y n cs h a l lc o n t a i n T t h e a ddress o f t h e RT w hich i s t r a n s m i t t i n g t h e s t a t u s word a s d e f i n e d i n 4.3.3.5.1.2. jlessaae e r r o r b i t . T he s t a t u s word b i t a t b i t time n i n e ( see 4.3.3.5.3.3 f i g u r e 3) s h a l l b e u t i l i z e d t o i n d i c a t e t h a t o n e o r more o f t h e d ata w ords a s s o c i a t e d w i t h t h e p r e c e d i n g r e c e i v e command word from t h e b u s c o n t r o l l e r h as f a i l e d t o p ass t h e R T's v a l i d i t y t ests as s p e c i f i e d i n 4.4.1.1. This b i t shall a l s o b e s e t u nder t h e c o n d i t i o n s s p e c i f i e d i n 4.4.1.2, 4.4.3.4 a nd 4.4.3.6. A l o g i co n es h a l li n d i c a t e t h e p r e s e n c e of a message e r r o r ,a n d a l o g i c z e r o s h a l l show i t s a bsence. All R T ' s s h a l l i mplement t h e message e r r o r b i t . 4.3.3.5.3.4 J n s t r u m e n t a t i o n b i t . T he s t a t u s word a t b i t time t e n ( see f i g u r e 3) s h a l l be r e s e r v e d f o r t h e i n s t r u m e n t a t i o n b i t a nd s h a l l a lways be a l o g i c zero. T h i s b i t i s i n t e n d e d t o b e u sed i n c o n j u n c t i o n w i t h a l o g i c o n e i n bit time t e n of t h e command word t o d i s t i n g u i s h b e t w e e n a command word and a s t a t u s word. T he u s eo f the instrumentation b i t is optional. 4.3.3.5.3.5 S e r v i c er e a u e s t b i t . T he s t a t u s word b i t a t b i t time e l e v e n ( see f i g u r e 3) s h a l l b e r e s e r v e df o r t h e s e r v i c e r e q u e s t b i t . The u s eo f t h i s b i t i s o p t i o n a l . T h i s b i t when used, s h a l l i n d i c a t e t h e n eedfor t h e b us c o n t r o l l e r t o t ake s p e c i f i c p r e d e f i n e d a c t i o n s r e l a t i v e t o e i t h e r t h e RT o r t o a s i n g l e R T, w hich a s s o c i a t e ds u b s y s t e m .M u l t i p l es u b s y s t e m s ,i n t e r f a c e d i n d i v i d u a l l y r e q u i r e a s e r v i c e r e q u e s t s i g n a l s h a l l l o g i c a l l y OR t h e i r i n d i v i d u a ls i g n a l si n t o t h e s i n g l e s t a t u s word b i t . I n t he e v e n t t h i s l o g i c a l O R i s p erformed,then t h e d e s i g n e r must make p r o v i s i o n s i n a s e p a r a t e d a t a word t o i d e n t i f y t h e s pecific r e q u e s t i n gs u b s y s t e m . T he s e r v i c e r e q u e s t b i t i s i n t e n d e d t o be u s e d o n l y t o t r i g g e r d ata t r a n s f e r o p e r a t i o n s w hich t a k e p l a c e o na ne x c e p t i o n r ather t h a np e r i o d i c b asis. A l o g i c o n e s h a l l i n d i c a t e t h e p r e s e n c eo f a s e r v i c er e q u e s t ,a n d a l o g i cz e r o i t s a bsence. If t h i s f u n c t i o n i s n otimplemented, t he b i t s h a l l b e s et t o z e r o . 4.3.3.5.3.6 R e s e r v e ds t a t u s b i t s . T he s t a t u s word b i t s a t b i t times t w e l v e t h r o u g hf o u r t e e n a re r e s e r v e d f o r f u t u r e u s e a n d s hall n o t be used. These b i t s s h a l l b e s et t o a l o g i c z e r o . 12 i ' Not for Resale MIL-STD-1553B 21 S eptember 1978 B r o a d c a s t command r e c e i v e d b i t . The s t a t & word a t b i t time f i f t e e n s h a l l b e s et t o a l o g i c o n e t o i n d i c a t e t h a t t h e precedingvalid command word w s a b r o a d c a s t command and a l o g i c z e r o s h a l l show i t was n o t a a b r o a d c a s t command. I f t h e b r o a d c a s t command o p t i o n i s n o tu s e d , t h i s b i t s h a l l be s e t t o a l o g i c z e r o . 4.3.3.5.3.7 B usv b i t . T he s t a t u s word b i t a t b i t time s i x t e e n ( see f i g u r e 3) s h a l l b e r e s e r v e df o r t h e b usy b i t . T he u s eo f t h i s b i t i s optional. This b i t , when used, s hall i n d i c a t e t h a t t h e RT o r s ubsystem i s u n a b l e t o move d a t a t o o r from t h e s ubsystemincompliance w i t h t h eb u sc o n t r o l l e r ' s command. A l o g i c o n e s h a l l i n d i c a t e t h e p resenceof a b usycondition,and a logiczero i t s a b s e n c e .I n t h e e vent t h e b usy b i t i s s e t i nr e s p o n s et o a t r a n s m i t command, t h e n t h e RT s h a l l t r a n s m i t i t s s t a t u s word only. If t h i s f u n c t i o n i s n o t implemented, t h e b i t s h a l l be s et t o l o g i c z e r o . 4.3.3.5.3.8 4.3.3.5.3.9 .L-3 T he s t a t u s word b i t a t b i t time s everiteen ( see f i g u r e 3 ) s h a l l b er e s e r v e df o r t h e s ubsystemflag b i t . T he u s eo f t h i s b i t i s o p t i o n a l . T h i s b i t , when u s e d , s h a l l f l a g a s u b s y s t e mf a u l tc o n d i t i o n , and a l e r t t h eb u sc o n t r o l l e rt op o t e n t i a l l yi n v a l i d d ata. M u l t i p l es u b s y s t e m s , i n t e r f a c e d t o a s i n g l e R T, w hich i n d i v i d u a l l y r e q u i r e a s u b s y s t e m f l a g b i t s i g n a l s h a l l l o g i c a l l y OR t h e i r i n d i v i d u a l s i g n a l s . i n t o t h e s i n g l e s t a t u s word b i t . I n t h e e v e n t t h i s l o g i c a l OR i s p erformed,then t h e d esignermust make p r o v i s i o n s i n a s e p a r a t e d a t a word t o i d e n t i f y t h e s pecific r e p o r t i n g t h e p resenceof t h e f l a g , and a l o g i c subsystem. A l o g i c o n e s h a l l i n d i c a t e z e r o i t s a bsence. If n o tu s e d , t h i s b i t s h a l l be s et t ol o g i cz e r o . p vnamicbuscontrolacceDtance b i t . T he s t a t u s word b i t a t b i t time e i g h t e e n ( see f i g u r e 3) s h a l l b e r e s e r v e df o rt h ea c c e p t a n c eo f dynamic b u sc o n t r o l . T h i s b i t s h a l l b e u sed i f t h e RT i mplements t h e o ptionaldynamic T h i s b i t , when u s e d ,s h a l li n d i c a t ea c c e p t a n c e or b u sc o n t r o lf u n c t i o n . r e j e c t i o n o f a d ynamicbuscontrol o ffer a s s p e c i f i e d i n 4.3.3.5.1.7.1. A l o g i co n e s h a l l i n d i c a t ea c c e p t a n c eo fc o n t r o l , and a l o g i c z e r o s h a l l i n d i c a t e r e j e c t i o n of c o n t r o l . I f t h i s f u n c t i o n i s n o tu s e d , t h i s b i t s h a l l b e s et t o l o g i cz e r o . Provided by IHS No reproduction or networking permitted without license from IHS --`,,``,-`-`,,`,,`,`,,`--- 4.3.3.5.3.10 4.3.3.5.3.11 .T he s t a t u s word b i t a t b i t time n i n e t e e n ( see f i g u r e 3) s h a l l b e r e s e r v e df o r t h e t e r m i n a lf l a gf u n c t i o n . T he u s eo ft h i s b i t i s o p t i o n a l . T h i s b i t , when used, s h a l l f l a g a RT f a u l tc o n d i t i o n . A l o g i co n es h a l li n d i c a t e a bsence. If n o tu s e d , t h e p resenceof t h e f l a g ,a n d a l o g i c z e r o , t h i s b i t s h a l l b e s et t ol o g i cz e r o . its 4.3.3.5.3.12 . P a r i t v b i t . The l east s i g n i f i c a n t b i t i n t h e s t a t u s word s h a l l be u t i l i z e d f o r p a r i t y a s s p e c i f i e d i n 4.3.3.5.1.6. S t a t u s word r eset. The s t a t u s word b i t , w i t h t h e e xceptionof the a ddress, s h a l l b e s et t o l o g i c z e r o a f t e r a v a l i d command word i s r e c e i v e d by t h e RT w i t h t h e e x c e p t i o n a s s p e c i f i e d i n 4.3.3.5.1.7. If t h e c o n d i t i o n s w hich c aused b i t s i n t h e s t a t u s word t o b e s et ( e . g . , t e r m i n a l f l a g ) c o n t i n u e after t h e b i t s a re reset t o l o g i c z e r o , t h e n t h e a f f e c t e d s t a t u s word b i t s h a l l b e a g a i n s e t , a ndthentransmittedon t h e b us a s r e q u i r e d . 4.3.3.5.4 4.3.3.6 M essage f o r m a t s . . T he m essagestransmittedon t h e d ata b us s h a l l b e i n accordance w i t h t h e f o r m a t so nf i g u r e 6 a n df i g u r e 7. The maximum and minimum No m essageformats, r e s p o n s e t imes s h a l l b e a s s tated i n 4.3.3.7 a nd 4.3.3.8. o t h e rt h a nt h o s ed e f i n e dh e r e i n , s h a l l b e u sed on t h e b us. Not for Resale L . MIL-STD-L553B N O T I C E 2 M C 79777LL 0 0 2 4 8 8 2 7 I t MIL-STD-1553B 2 1 S eptember 1978 4.3.3.6.1 Bc o n t r o lrlteom o t e m i n a a n s f e r s . us er ter tr l T he bcu sn t r o l l e r o s h a l l i s s u e a r e c e i v e command followed by t h e s p e c i f i e d number of d ata w ords. T he RT s h a l l , a fter m e s s a g e v a l i d a t i o n , t r a n s m i t a s t a t u s word back t o t h e c o n t r o l l e r . T he command and d ata w ords s h a l l b et r a n s m i t t e di n a contiguous f a s h i o n w i t h n o interword gaps. 4.3.3.6.2 R emote t e r m i n a lt ob u sc o n t r o l l e rt r a n s f e r s . The b u sc o n t r o l l e r s h a l l i ssue a t r a n s m i t command t o t he RT. T he RT s h a l l , a fter command word v a l i d a t i o n , t r a n s m i t a s t a t u s word back t o t h e b u sc o n t r o l l e r ,f o l l o w e d by t h e s p e c i f i e d number o f d ata w ords. T he s t a t u s and d ata w ords s h a l lb et r a n s m i t t e d i n a e o n t i g u o u s f a s h i o n w i t h no i n t e r w o r d g a p s . B emote terminal t o r e m o t et e r m i n a lt r a n s f e r s . The b u sc o n t r o l l e r s h a l l i s s u e a r e c e i v e command t o RT A f o l l o w e d c o n t i g u o u s l y by a t r a n s m i t command t o RT B. RT B s hall, a fter command v a l i d a t i o n ,t r a n s m i t a s t a t u s word followed by t h e s p e c i f i e d number o f d ata w ords. The s t a t u s and d ata w ords s h a l l b e t r a n s m i t t e d i n a c o n t i g u o u sf a s h i o n w i t h no gap. A t t h e c onclusionof t h e d ata t r a n s m i s s i o n by RT B , RT A s h a l l t r a n s m i t a s t a t u s word w i t h i n t h e s p e c i f i e d time p e r i o d . 4.3.3.6.3 4.3.3.6.4 Mode command w i t h o u t d ata w ord. T he b u sc o n t r o l l e r s h a l l i s s u e a t r a n s m i t command t o t h e RT u s i n g a mode c o d e s p e c i f i e d i n t a b l e I. T he RT s h a l l , a f t e r command word v a l i d a t i o n , t r a n s m i t a s t a t u s word. Mode command w i t h d ata word ( t r a n s m i t ) . The b us c o n t r o l l e rs h a l l i s s u e a t r a n s m i t command t o t h e R T u s i n g a mode c o d e s p e c i f i e d i n t a b l e I. The R T s h a l l , a f t e r command word v a l i d a t i o n , t r a n s m i t a s t a t u s word followed by one d a t a word. T he s t a t u s word and d ata word s h a l l b e t r a n s m i t t e d i n a c ontiguous f a s h i o n w i t h nogap. 4.3.3.6.5 4.3.3.6.6 Mode command w i t h d a t a word ( r e c e i v e ) . T he b u sc o n t r o l l e r shall i s s u e a r e c e i v e command t o t h e RT u s i n g a mode c o d e s p e c i f i e d i n t a b l e I, f ollowed by one d ata word. The command word anddata word s h a l l b e t r a n s m i t t e d i n a c o n t i g u o u sf a s h i o n w i t h no gap. T he R T s h a l l , a f t e r command and d ata word v a l i d a t i o n , t r a n s m i t a s t a t u s word back t o t h e c o n t r o l l e r . 4.3.3.6.7 the use of O Dtional broadcast command. t h e b r o a d c a s t command. S e e 10.6 f o ra d d i t i o n a li n f o r m a t i o no n B u sc o n t r o l l e rt or e m o t et e r m i n a l ( s 1t r a n s f e r( b r o a d c a s t ) . T he buscontrollershallissue a r e c e i v e command word w i t h 1 1 1 1 1 i n t he RT a ddress f i e l df o l l o w e d by t h e s p e c i f i e d number of d ata w ords. The command word and d ata w ords s h a l l b e t r a n s m i t t e d i n a c o n t i g u o u sf a s h i o n w ith n ogap. T he R T ( s ) w i t h thebroadcastoption s h a l l a f t e r m e s s a g e v a l i d a t i o n , s et t h e b r o a d c a s t command r e c e i v e d b i t i n t h e s t a t u s word a s s p e c i f i e d i n 4.3.3.5.3.7 a nd s h a l l n o t t r a n s m i t t h e s t a t u s word. 4.3.3.6.7.1 Provided by IHS No reproduction or networking permitted without license from IHS Not for Resale --`,,``,-`-`,,`,,`,`,,`--- MIL-STD-1553B N O T I C E 2 MC m 777791L 0 02LI883 O W ' . MIL-STD-1553B 2 1 September 1 978 * * .. s 2 54 W * 3 : L ""- * 1 I * * * 3 : 15 Provided by IHS No reproduction or networking permitted without license from IHS Not for Resale --`,,``,-`-`,,`,,`,`,,`--- MIL-STD-1553s 2 1 September 1978 . " 7 =%2 Provided by IHS No reproduction or networking permitted without license from IHS --`,,``,-`-`,,`,,`,`,,`--- 16 =- Not for Resale MIL-STD-1553B 21 September 1978 4.3.3.6.7.2 pemote terminal t o remote erminal(s1 ransfers broadcast). t t ( The b u s c o n t r o l l e r s h a l l i s s u e a r e c e i v e command word w i t h 11111 i n t h e R T a ddress f i e l df o l l o w e db y a transmit command t o R T A u sing t h e R T ' s a ddress. R T A s h a l l , a f t e r command word v a l i d a t i o n , t r a n s m i t a s t a t u s word followedby t h e s p e c i f i e d number o f d ata w ords. The s tatus a nd d ata w ords s h a l l b e t r a n s m i t t e d i n a c o n t i g u o u sf a s h i o n w i t h n o g ap. The R T ( s ) w i t h t h e b r o a d c a s to p t i o n , -excluding HT A , s h a l l a f t e r message v a l i d a t i o n , s et t h e b r o a d c a s t r e c e i v e d b i t i n t h e s t a t u s word a s s pecified i n 4.3.3.5.3.7 a nd s h a l l n o t t r a n s m i t t h e s t a t u s word. 4.3.3.6.7.3 Mode command w i t h o u td a t a word ( b r o a d c a s t ) . The b u sc o n t r o l l e r s h a l l i s s u e a t r a n s m i t command word w ith 11 111 i n t h e R T a ddress f i e l d , and a mode code s p e c i f i e d i n t able I. The R T ( s ) w i t ht h eb r o a d c a s to p t i o n shall a f t e r command word v a l i d a t i o n , s et t h e b r o a d c a s t r e c e i v e d b i t i n t h e s t a t u s word as s p e c i f i e d i n 4 . 3 . 3 . 5 . 3 . 7 and s h a l l n o t t r a n s m i t t h e s t a t u s word. ' i ssue a r e c e i v e command word w i t h 11111 i n t h e RT a d d r e s s f i e l d a nd a mode code s p e c i f i e di nt a b l e I , f ollowedbyone d ata w ord. The command word and d ata word s h a l l b e t r a n s m i t t e di n a c o n t i g u o u sf a s h i o n w i t h n ogap. T he R T ( s ) w i t h t h e b r o a d c a s t o p t i o n s h a l l a f t e r message v a l i d a t i o n , s et t h e b r o a d c a s t r e c e i v e d b i t i n t h e s t a t u s word a s s p e c i f i e di n4 . 3 . 3 . 5 . 3 . 7 a nd s h a l l n o t t r a n s m i t t h e s t a t u s word. 4.3.3.7 Jntermessane QaD. The b u s c o n t r o l l e rs h a l lp r o v i d e a minimum gap time o f 4.0 m icroseconds ( u s ) b etween messages a s shown o n f i g u r e 6 and f igure 7 . This time p e r i o d , shown a s T o n f i g u r e 8 , i s measured a t p o i n t A o f t h e b us c o n t r o l l e r a s shown o nf i g u r e 9 o r f igure 1 0. The time i s m easuredfrom t h e mid-bit zerocrossingof t h e l a s t b i t o f t h e p receding message to mid-zero C r o s s i n g o f t h e n e x t command word s y n c . 4.3.3.8 ResDonse time. The R T s h a l l r e s p o n d ,i na c c o r d a n c e w i t h 4 .3.3.6, t o a v a l i d command word w i t h i n t h e time p e r i o do f 4 .0 t o 12.0 31s. T h i s time p e r i o d , shown a s T o n f i g u r e 8 , i s measured a t p o i n t A o f t h e RT a s shown o n f i g u r e 9 o r f igure 1 0. The time i s measured from t h e m id b i t z e r o c r o s s i n g o f t h e l a s t word a s s p e c i f i e d in 4 .3.3.6 and a s shown o n f i g u r e 6 and f i g u r e 7 t o t h e m i d - z e r o c r o s s i n g o f t h e s t a t u s word s y n c . 4.3.3.9 hinimum no-remonse time-out. The minimum time t h a t a t e r m i n a ls h a l l wait b e f o r e c o n s i d e r i n g t h a t a r e s p o n s e a s s p e c i f i e d i n 4 . 3 . 3 . 8 h as n o t occurred s h a l l b e 14.0 us. The time i s measured from t h e m i d - b i t z e r oc r o s s i n g o f t h e l a s t b i t o f t h e l a s t word t o t h e m i d - z e r o c r o s s i n g o f t h e e xpected s t a t u s word sync a t p o i n t A o f t h e t e r m i n a l a s shown o n f i g u r e 9 o r f i g u r e IO. 4.4 Terminal oDeration. 4.3.3.6.7.4 Mode command w i t h d ata word ( b r o a d c a s t ) . T he b u sc o n t r o l l e r shall 4.4.1 Common o o e r a t i o n .T e r m i n a l s s h a l l h a v ec m m o no p e r a t i n gc a p a b i l i t i e s s p e c i f i e di nt h ef o l l o w i n g p aragraphs. as --`,,``,-`-`,,`,,`,`,,`--- Provided by IHS No reproduction or networking permitted without license from IHS Not for Resale MIL-STD-1553B OTICE N 2 MC m 77777LL 0024886 b m. I ML-STU-1553B 2 1 September 1978 I H $1 U H W a , I s PI c H H L" " " a I v) H O cl O + + I --`,,``,-`-`,,`,,`,`,,`--- Provided by IHS No reproduction or networking permitted without license from IHS Not for Resale MIL-STD-1553B 2 1 September 1 978 \ , : l \ I /t DATA WIRE I R = 0.75Z0 f 2% . I, COUPLING TRANSFORMER --ISOLATION TRANSFORMER FIGURE 9. Data bus interface u sing transformer c oupling. Provided by IHS No reproduction or networking permitted without license from IHS Not for Resale --`,,``,-`-`,,`,,`,`,,`--- I TERMINAL Provided by IHS No reproduction or networking permitted without license from IHS --`,,``,-`-`,,`,,`,`,,`--- hIL-STD-1553b 2 1 S eptember 1 978 I I I I / BUS / S HlELD I ." I "'. \ < " - DATA BUS WR PAIR IE ' i _" $&' I I '! \ \ I I I SHIELDING STUB OF SPECIFIED LENGTH R R " 4" "" - ISOLATION TRANSFORMER I TRANSMITTER/RECEIVER TERMINAL I FIGURe 10. D ata b us i n t e r f a c e u s i n g d i r e c t c o u p l i n g . 20 Y=- Not for Resale -P - MIL-STD-L553B NOTICE 2 M C W 7 777711 0 0 2 4 8 8 7 1 m’ NIL-STD-1553B 21 S eptember 1978 Word v a l i d a t i o n . The t e r m i n a l s h a l l insure that each word conforms t o 4.4.1.1 t h e f o l l o w i n g minimun c r i t e r i a : a. b. c. d. The The The The word b e g i n s w i t h a v a l i ds y n c f i e l d . b i t s a r e i n a v alidManchester Il c ode. i n f o r m a t i o n f i e l d has 16 b i t s p l u sp a r i t y . word p a r i t y i s o dd. t h e p receding c r i t e r i a , t h e word s h a l l b e k hen a word f a i l s t o conformto c o n s i d e r e di n v a l i d . T r a n s m i s s i o nc o n t i n u i t y . The t e r m i n a l s h a l l v e r i f y t h a t t h e m essage i s c o n t i g u o u s a s d e f i n e d i n 4.3.3.6. I m p r o p e r l y timeá d ata s y n c s s h a l l b e considered a messageerror. 4.4.1.2 T erminal f ail-safe. The terminal s h a l l c o n t a i n a hardware i mplemented time-out t o p recltide a s i g n a lt r a n s m i s s i o n o f g reater t h a n 8 00.0 us. T h i s hardware s h a l l n o t p r e c l u d e a c orrect t r a n s m i s s i o n i n r e s p o n s e t o a command. Reset o f t h i s t ime-out function s h a l l b e p erformed by t h e r e c e p t i o n o f a v a l i d command o n t h e b us o n which t h e t ime-out h as o c c u r r e d . 4.4.1.3 4.4.2 Bus c o n t r o l l e ro p e r a t i o n . s h a l l b e r e s p o n s i b l ef o rs e n d i n gd a t a A t e r m i n a lo p e r a t i n g a s a b u sc o n t r o l l e r b u s c ommands, p a r t i c i p a t i n g i n d a t a t ransfers, r e c e i v i n g s t a t u s r e s p o n s e s , a n d m o n i t o r i n g system s t a t u s a s d e f i n e d i n t h i s s t a n d a r d . t h e b u s c o n t r o l l e rf u n c t i o n may b e e mbodied a s e i t h e r a s t a n d - a l o n e t e r m i n a l , whose s o l e f u n c t i o n i s t o c o n t r o l t h e d a t a b u s ( s ) , o r c o n t a i n e dw i t h i n a s ubsystem.Onlyoneterminal shall b e i na c t i v ec o n t r o lo f a d ata b u s a t a ny one time. 4.4.3 Remote t e r m i n a l . 4.4.3.1 O p e r a t i o n . A r emote termirial (RT) s h a l l o p e r a t ei nr e s p o n s et ov a l i d The H T s h a l l a ccept a command word commands r e c e i v e d from t h e b u s c o n t r o l l e r . a s v a l i d when t h e command word meets t h e c r i t e r i a o f 4.4.1.1, a nd t h e command word c o n t a i n s a t erminal a ddress w hich m atches t h e R T a ddress o r a n a ddress o f 1 1 111, i f t h e R T h as t h e b r o a d c a s t o p t i o n . S u D e r s e d i n av a l i d commands. The R T s h a l l b e c a p a b l e o f r e c e i v i n g a command word on t h e d ata b u s a f t e r t h e minimum i n t e r m e s s a g e g a p t i n e a s s p e c i f i e d i n 4.3.3.7 has b eenexceeded, when t h e HT i s n o t i n t h e time period T a s s pecified i n 4.3.3.8 p r i o r t o t h e t r a n s m i s s i o n o f a s t a t u s word,and when i t i s n o t transmitting o n t h a t d a t a b u s . A s e c o n dv a l i d command word s e n t t o a n RT s h a l l t a k e p recedenceover t he p r e v i o u s command. l h e RT s h a l l r e s p o n dt o t h e s e c o n d v a l i d command a s s p e c i f i e d i n 4.3.3.8. 4.4.3.2 4.4.3.3 I n v a l i d commands. A r emote t erminal s h a l l n o tr e s p o n dt o word w hich f ails t o meet t h e c r i t e r i a s p e c i f i e d i n 4.4.3.1. a command 4.4.3.4 I l l e a a l command. A i l l e g a l command i s a v a l i d command a s s p e c i f i e d n i n 4.4.3.1, where t h e b i t s i n t h e s ubaddress/mode f i e l d , d ata word count/mode code f i e l d , a nd t he T/R b i t i n d i c a t e a mode command, s u b a d d r e s s , o r word c o u n t that has n otbeenimplementedin t h e RT. I t i s t h e r e s p o n s i b i l i t y o f t h e b u s c o n t r o l l e r to assure that n o i l l e g a l commands a r e s e n t o u t . T he AT d e s i g n e r has t h e o p t i o n o f m o n i t o r i n g f o r i l l e g a l ccxnmands. If a n R T t h a t i s d e s i g n e d w ith t h i s o p t i o n d e t e c t s a n i l l e g a l command a nd t h e p roper number o f c o n t i g u o u s 21 a Provided by IHS No reproduction or networking permitted without license from IHS Not for Resale --`,,``,-`-`,,`,,`,`,,`--- MIL-STD-1553B 21 S eptember 1978 v a l i d d ata w ords a s s p e c i f i e d by t h e i l l e g a l command word, i t s h a l l r e s p o n d w ith a s t a t u s word o n l y , s e t t i n g t h e m essage e r r o r b i t , andnotuse the informationreceived. - 4.4.3.5 V a l i dd a t ar e c e D t i o q . T he r e m o t et e r m i n a ls h a l lr e s p o n dw i t h a status d ata word when a v a l i d command word and t h e p roper number o f c o n t i g u o u s v a l i d w ords a r e r e c e i v e d , o r a s i n g l e v a l i d word a s s o c i a t e d w i t h a mode code i s r e c e i v e d . Each d a t a word s h a l l meet t h e c r i t e r i a s p e c i f i e d i n 4.4.1.1. 4.4.3.6 I n v a l i dd a t ar e c e D t i o n . Any d a t aw o r d ( s )a s s o c i a t e dw i t h a valid r e c e i v e command t h a t d o e sn o t meet t h e c riteria s p e c i f i e d i n 4.4.1.1 a nd 4.4.1.2 o r a n e r r o r i n t h e d a t a word count s h a l l c a u s e t h e r e m o t e t e r m i n a l t o s e t t h e m e s s a g ee r r o r b i t i n t h e s t a t u s word t o a l ogiconeandsuppress the t r a n s m i s s i o no f t h e s t a t u s word. If a m e s s a g ee r r o r h a s o c c u r r e d ,t h e nt h e e n t i r e m e s s a g e s hall b e c o n s i d e r e d i n v a l i d . . 4.4.4 B usmonitoroDeration. A t e r m i n a lo p e r a t i n g a s a b usmonitor shall r e c e i v eb u s t r a f f i c a nd e x t r a c ts e l e c t e di n f o r m a t i o n . While o p e r a t i n g a s a b us monitor, t h e t e r m i n a l s h a l l n o tr e s p o n dt oa n ym e s s a g ee x c e p to n ec o n t a i n i n g i t s own u n i q u ea d d r e s s i f o ne i s a s s i g n e d . A l l i n f o r m a t i o no b t a i n e d w hile a c t i n g a s a b usmonitor s h a l l b e s t r i c t l y u s e d f o r o f f - l i n e a p p l i c a t i o n s ( e . g . , f l i g h t t e s t r e c o r d i n g ,m a i n t e n a n c er e c o r d i n go rm i s s i o na n a l y s i s )o rt op r o v i d e the back-upbuscontrollersufficientinformationto t ake o ver a s t h e b us controller. 4.5 4.5.1 Bardware haracteristics. c Data us haracteristics. bc 4.5.1.1 Cable. T he c a b l eu s e df o r t h e m ain and bus a l l s t u b s s h a l l be a two c o n d u c t o r , t wisted, s h i e l d e d , j acketed c able. T he w i r e - t o - w i r e i s t r i b u t e d d c a p a c i t a n c e s h a l l n otexceed 3 0.0 p i c o f a r a d sp e rf o o t . T he c ables s h a l l b e formed w i t h n o t l ess t h a nf o u r twists p e rf o o t where a twist i s d e f i n e d a s a 360 d e g r e e r o t a t i o n o f t h e wire p a i r s ; a n d , t h e c able s h i e l d s h a l l p r o v i d e a minimum o f 7 5.0 p ercent coverage. 4.5.1.2 . C haracteristic i mDedance. T he n o m i n a l h a r a c t e r i s t i c m p e d a n c e f c i o the c able ( zo) s h a l l b e w i t h i n t h e r ange of 70 .O ohms t o 85 .O ohms a t a s i n u s o i d a l frequency of 1 .O m egahertz (MHz). s h a l l n otexceed 4.5.1.3 C a b l ea t t e n u a t i o n . A t t h e f requency of 4.5.1.2, 1.5 d ecibels (dB)/100 f eet ( f t ) . t h e c able p ower l o s s 4.5.1.4 C able t e r m i n a t i o n . T he two endsof t h e c able s h a l l b e t e r m i n a t e d w i t h a r e s i s t a n c e ,e q u a lt o t h e s e l e c t e d c able n o m i n a lc h a r a c t e r i s t i ci m p e d a n c e ( Zo) + 2.0 p e r c e n t . - 4.5.1.5 C a b l es t u br e o u i r e m e n t s . The c able s h a l l b e c o u p l e dt o t h e t e r m i n a l a s shown on f i g u r e 9 o r f i g u r e 10. T he u s eo fl o n gs t u b s is discouraged,'and t h e l e n g t h of a s t u bs h o u l d b e m inimized. However, if installation requirements d i c t a t e , s t u bl e n g t h se x c e e d i n gt h o s el e n g t h ss p e c i f i e di n 4.5.1.5.1 a nd 4.5.1.5.2 a re p e r m i s s i b l e . 22 --`,,``,-`-`,,`,,`,`,,`--- , Not for Resale Provided by IHS No reproduction or networking permitted without license from IHS MIL-STD-1553B 21 S eptember 1978 4.5.1.5.1 T ransformer CouDled s t u b s . The l e n g t h of a t r a n s f o r m e r o u p l e d t u b c s s h o u l dn o t exceed 20 f e e t . If a t r a n s f o r m e r c oupled s t u b i s u sed,then the following shall apply. 4.5.1.5.1.1 C ouDlinn transformer. A couplingransformer, t a s shown o n i g u r e f 9, s h a l l be r e q u i r e d . T h i s t r a n s f o r m e r s h a l l h ave a t u r n s r a t i o o f 1 :1 .h1 k 3.0 p e r c e n t , w i t h t h e h i g h e r t u r n s o n t h e i s o l a t i o n r esistor s ide of t h e s t u b . 4.5.1.5.1.1.1 T ransformer inDut imDedance. The o pen c i r c u i t impedance a s s e e n a t p o i n t B o n f i g u r e 1 1 s h a l l be g reater t h a n 3000 ohms o v e r t h e f requency r a n g e o f 75.0 k i l o h e r t z (kHz) t o 1.0 m egahertz (MHz), when measured w i t h a 1.O'V r oot-mean-square ( RMSI s i n wave. 4.5.1.5 .l. 1.2 T r a n s f o r m e rw a v e f o r mi n t e a r i t v . T he d roop of t h e t r a n s f o r m e r u s i n g t h e t e s t c o n f i g u r a t i o n shown o n f i g u r e 1 1 a t p o i n t B, s h a l l n otexceed 20.0 p ercent.Overshootandringing a s m easured a t p o i n t B s h a l l b e l ess t h a t 2 1 V p eak. For t h i s t e s t , R s h a l l e q u a l 360.0 ohms 2 5.0 p ercentand t h e .0 i n p u t A o f f i g u r e 1 1 s h a l l b e a 250.0 kHz s q u a r e wave. 27.0 V p eak-to-peak, w i t h a r ise a nd f a l l time n o g reater t h a n 100 n anoseconds(ns). 4.5.1.5.1.1.3 T T . T he c o u p l i n gr a n s f o r m e r t s h a l l h ave a common mode r e j e c t i o n r a t i o g reater t h a n 45.0 d B a t 1.0 MHz. 4.5.1.5.1.2 F a u l ti s o l a t i o n . An i s o l a t i o n r esistor s h a l l b ep l a c e di n series w i t h e ach c o n n e c t i o nt o t h e d ata b us c able. T h i s r esistor s h a l l h ave a v a l u e of 0 .75 Z O ohms p l u s o r m inus 2.0 p e r c e n t , where Z O i s t h e s elected c able n ominal c h a r a c t e r i s t i c i mpedance. T he i mpedance placed across t h e d ata b us c a b l e s h a l l b eno l ess t h a n 1.5 20 ohms f or a n y f a i l u r e o f t h e c o u p l i n g t r a n s f o r m e r , c able s t u b , o r t e r m i n a lt r a n s m i t t e r / r e c e i v e r . 4.5.1.5.1.3 C able C ouDlina. A l l c o u p l i n g r a n s f o r m e r s n d s o l a t i o n t ai r esistors, a s s p e c i f i e d i n 4.5.1.5.1.1 a nd 4.5.1.5.1.2, s h a l l h avecontinuous s h i e l d i n g w hich w l p r o v i d e a minimum o f 75 p ercentcoverage. il T he i s o l a t i o n r esistors a n dc o u p l i n gt r a n s f o r m e r s s h a l l b e p laced a t minimum p o s s i b l e d i s t a n c e from t h e j u n c t i o n o f t h e s t u b t o t h e m ainbus. 4.5.1.5.1.4 S t u b voltasTe reauirements. Every d ata b us s h a l l be d esigned such t h a t a l l s t u b s a t p o i n t A of f i g u r e 9 s h a l l h ave a p eak-to-peakamplitude, t h e r a n g e o f 1 .O a nd 14.0 V f or a t r a n s m i s s i o n by a n y line-to-linewithin t e r m i n a lo n t h e d ata b us. T h i s s h a l l i n c l u d e t h e maximum r e d u c t i o n of d a t a b us s i g n a l a m p l i t u d e i n t h e e v e n t t h a t o ne o f t h e t e r m i n a l s has a f a u l t w hich c a u s e s i t t o r e f l e c t a f a u l t i m p e d a n c e s pecified i n 4.5.1.5.1.2 o n t h e d ata b us. T h i s s h a l l a l s o i n c l u d et h e worse c ase o u t p u tv o l t a g e of t h e t e r m i n a l s a s s p e c i f i e d i n 4.5.2.1.1.1 a nd 4.5.2.2.1.1. D i r e c t couDled stubs. T he l e n g t h of a d i r e c t c o u p l e ds t u bs h o u l d 4.5.1.5.2 n o te x c e e d 1 f oot. Refer t o 10.5 f o r comments c o n c e r n i n g d i r e c t c oupledstubs. If a d i r e c t c o u p l e ds t u b i s u s e d ,t h e nt h e f ollowing s h a l l a p p l y . 4 - 5- 1 -5.2.1 F a u l t i s o l a t i o n . w i t h e ach c o n n e c t i o nt o t h e d ata b us c able. o f 55.0 ohms p l u s o r m inus 2.0 p e r c e n t . The p l a c e d w i t h i n t h e RT a s shown o n f i g u r e 1 0. An i s o l a t i o n r esistor s h a l l b e p l a c e d i n s eries T h i s r esistor s h a l l h ave a v a l u e i s o l a t i o n r esistors s h a l l b e --`,,``,-`-`,,`,,`,`,,`--- Provided by IHS No reproduction or networking permitted without license from IHS Not for Resale M IL-STD-IJ553B N O T I C E 2 M C W 77777LL 0 0 2 4 8 9 2 I W- h I L S T D - I 553B 2 1 S e p t e m b e r 1978 ' OUTPUT B R :N A ol PERCENT DROOP = C 6 x 100 FIGURE 1 1. CouDlina t ransformer. TERMINAL P FIGURE 12. e Terminal I f 0 characteristics for transformer coupled and direct stubs. oupled c 24 E --`,,``,-`-`,,`,,`,`,,`--- Provided by IHS No reproduction or networking permitted without license from IHS Not for Resale MIL-STD-1553B 21 September 1978 Cable c ouDlinq. All b u s - s t u b u n c t i o n s j s h a l l h ave continuous 4.5.1.5.2.2 il s h i e l d i n g w hich w l p r o v i d e a minimum o f 75 p e r c e n t c o v e r a g e . 4.5.1.5.2.3 $ tubvoltaaereauirements.Everydatabus s h a l l be d esigned such t h a t a l l s t u b s a t p o i n t A o f f i g u r e 10 s h a l l h ave a p eak-to-peakamplitude, l i n e - t o - l i n e w i t h i n t h e r a n g e o f 1.4 a nd 20.0 V f o r a t r a n s m i s s i o n by any t e r m i n a lo n t h e d atabus. T h i s s h a l li n c l u d e t he maximum r e d u c t i o n o f d a t a bussignalamplitudeintheevent t h a t o n e o f t h e t e r m i n a l s h a s a f a u l t w hich c a u s e s i t t o r e f l e c t a f ault i mpedanceof 110 ohms on t h e d ata b us, T his s h a l l a l s o i n c l u d e t h e w orst c ase o u t p u t v o l t a g e o f t h e t e r m i n a l s as s p e c i f i e d i n 4.5.2.1.1.1 a nd 4.5.2.2.1.1. W iring cabling and for EM€. For p u r p o s e so fe l e c t r o m a g n e t i c 4.5.1.5.3 MIL-E-6051 s h a l l a p p l y . c a p a b i l i t y ( EMC), t h e w i r i n ga n dc a b l i n gp r o v i s i o n so f 4.5.2 . 4.5.2.1 T T e r m i n a l s w i t h t r a n s f o r m e r CouDled s t u b s . 4.5.2.1.1 1 T he f o . l l o w i n g c haracteristics s h a l l b emeasured w i t h R L, a s shown On f i g u r e 12, e q u a l t o 7 0.0 ohms 2 2.0 percent. 4.5.2.1.1.1 OUtDUt levels. The t e r m i n a lo u t p u tv o l t a g el e v e l s s h a l l be m easuredusingthe t e s t c o n f i g u r a t i o n shown on f i g u r e 12. The t e r m i n a lo u t p u t v o l t a g e s h a l l b ew i t h i n t h e r a n g eo f 18.0 t o 27.0 V , p eak-to-peak, l i n e - t o - l i n e , when measured a t p o i n t A o n f i g u r e 12. 4.5 -2.1.1.2 OUtDut waveform. T he w aveform, when measured a t p o i n t A o nf i g u r e 12 s h a l l h a v e z e r o c r o s s i n g d e v i a t i o n s w hich a re e q u a l t o , or l ess t h a n , 25.0 n s from t h e i d e a l c r o s s i n g p o i n t , m e a s u r e d w i t h r espect t o t h e p r e v i o u s z e r o c r o s s i n g ( i . e . , .5 2 .O25 P S , 1.0 2 .O25 PS, 1 5 2 .O25 P S , a nd 2.0 2 .O25 . T he r ise a nd f a l l time o f t h i s w aveform s h a l l b e f rom 100.0 t o 300.0 n s when measuredfromlevelsof 10 t o 90 p e r c e n t o f f u l l waveformpeak-to-peak, a s shown on f i g u r e 1 3. Any d i s t o r t i o n o f t h e waveform l i n e - t o - l i n e ,v o l t a g e i n c l u d i n go v e r s h o o ta n dr i n g i n gs h a l ln o te x c e e d f 9 00.0 m i l l i v o l t s (mV) peak, l i n e - t o - l i n e , a s m easured a t p o i n t A , f i g u r e 12. 4.5.2.1.1.3 O utDut noise. Any n o i s et r a n s m i t t e d when t h e t e r m i n a l i s r e c e i v i n g o r h as p owerremoved, s h a l l n otexceed a v a l u e of 14.0 m V, RMS, l i n e - t o - l i n e , a s m easured a t p o i n t A , f i g u r e 12. 4.5.2.1.1.4 O utDut svmmetrv. From t h e time b eginning 2.5 p s a fter t h e m id-bit c r o s s i n g o f t h e p a r i t y b i t o f t h e l a s t word t r a n s m i t t e d by a t e r m i n a l ,t h e maximum v o l t a g e a t p o i n t A o f f i g u r e 12 s h a l l b e no g r e a t e r t h a n 2 250.0 m V p eak, l i n e - t o - l i n e . T h i s s h a l l be t ested w ith t h e t e r m i n a lt r a n s m i t t i n g t h e maximum number ofwords i t i s d e s i g n e dt ot r a n s m i t , up t o 33. T h i s t e s t s h a l l b e r u n s i x t imes w ith each word i n a c ontiguousblockofwordshaving t he same b i t p a t t e r n . T he s i x word c o n t e n t s t h a t s h a l l b e u sed a re 800016, 7FFF16, 0 000 6 FFFF1 555516, a nd A AAA16. T he O utput Of t h e t e r m i n a l h a l l be a s s specified i n 815.2.1.1.1 a nd 4.5.2.1.1.2. 4.5.2.1.2 b e m easured independently. l’erminal nDut haracteristics. i c T he f o l l o w i n g c haracteristics s h a l l --`,,``,-`-`,,`,,`,`,,`--- Provided by IHS No reproduction or networking permitted without license from IHS .. Not for Resale MIL-STD-1553B 2 1 September 1 978 ro F: O O T rl Provided by IHS No reproduction or networking permitted without license from IHS --`,,``,-`-`,,`,,`,`,,`--- N O o \ O u ) m O H I4 - m * O E= I H I4 O Not for Resale p MIL-STD-15538 N O T I C E 2 MC 799991L 0 0 2 4 8 9 5 ? - ' 7 MIL-STD-1553E 21 S eptember 1978 4.5.2.1.2.1 I nDut waveform ComDatibilitv. 'The t e r m i n a ls h a l l be c a p a b l eo f r e c e i v i n g a n d o p e r a t i n g w i t h t h e i n c o m i n gs i g n a l s s p e c i f i e d h e r e i n , a n d s h a l l a c c e p t waveform varyingfrom a s q u a r e wave t o a s i n e wave w ith a m a x i m u m z e r o crossing deviation from the i deal w i t h r e s p e c t t o t h e p r e v i o u s z e r o c r o s s i n g o f 2 150 n s , ( i . e . , 2.0 2 .15 p , 1.5 2 .15 P S , 1.0 2 .15 P S , .5 2 .15 PS). T he t e r m i n a l s h a l l r espond t o a n i n p u t s i g n a l whose peak-to-peakamplitude, l i n e - t o - l i n e , i s w i t h i nt h er a n g eo f .86 t o 14.0 V . The t e r m i n a l s h a l l n o t r e s p o n dt oa ni n p u ts i g n a l whose peak-to-peakamplitude,line-to-line, is w i t h i n t h e r a n g e o f 0.0 t o .20 V . The v o l t a g e s a re m easured a t p o i n t A o n f i g u r e 9. 4.5.2.1.2.2 Any s i g n a l s from d irect c u r r e n t (DC) t o 2.0 MHz,with a m p l i t u d e s e q u a l t o o r l e s s t h a n +, 10. O V p e a k , l i n e - t o - g r o u n d , measured a t p o i n t A o n f i g u r e 9, s h a l l n o t d egrade t h e p erformance of t h e receiver. 4.5.2.1.2.3 I nDut imoedance. The magnitudeof t h e t erminalinputimpedance , when t h e R T i s n o t t r a n s m i t t i n g , o r h as power r emoved, s h a l l b e a minimum of 1000.0 ohms w i t h i n t h e f r e q u e n c y range o f 75.0 k hz t o 1 .O MHz. T h i s i mpedance i s t h a t measuredline-to-line a t p o i n t A o n f i g u r e 9. 4.5.2.1.2.4 T he t e r m i n a l s h a l l e x h i b i t a maximum word e r r o r r a t e o f o n e p a r t in 107 , o n a l l w ords received by t h e t e r m i n a l , a f t e r v a l i d a t i o n checks a s s p e c i f i e d i n 4.4, when o p e r a t i n g i n t h e p r e s e n c e o f a d d i t i v e w hite G a u s s i a n n o i s e d i s t r i b u t e d o v e r a b andwidthof 1.0 kHz t o 4.0 MHz a t a n R S a m p l i t u d e f M o 140 m V. A word e r r o s h a l i n c l u d e n y a u l t r l af w hich c a u s e s t h e m e s s a g e e r r o r b i t t o b e set i n t h e t e r m i n a l ' s s t a t u s word , o r o ne which c a u s e s a t e r m i n a lt on o tr e s p o n dt o a v a l i d command. T he word e r r o r r a t e s h a l l b emeasured w i t h a 2.1 V p e a k - t o - p e a k , l i n e - t o - l i n e , i n p u t t o the t e r m i n a l a s m easured a t p o i n t A o n f igure 9 , The n o i s e t ests s h a l l b e r u n c o n t i n u o u s l y u n t i l , f o r a p a r t i c u l a r number o f f a i l u r e s , t h e number o f words r e c e i v e d by t h e t e r m i n a l , i n c l u d i n g b o t h command and d ata w ords,exceeds t h e r e q u i r e d number f o r a c c e p t a n c e o f t h e t e r m i n a l , o r i s l e s s t h a n t h e r e q u i r e d number f o r r e j e c t i o n o f t h e t e r m i n a l , as s p e c i f i e d i n t a b l e I I. A l l d ata w ords used i n t h e t ests s h a l l c o n t a i n random b i t p a t t e r n s . T hese b i t p a t t e r n s s h a l l b e u n i q u e f o r each d a t a word i n a message, a nd s h a l l c hangerandomlyfrom message t o message. Noiseraiection. .- .- 4.5.2.2 1 . 4.5.2.2.1 T erminal O U t D U t c haracteristics. T he f o l l o w i n g c haracteristics s h a l l b emeasured w i t h R L, a s shown o n f i g u r e 12, e q u a l t o 35.0 ohms f 2 . 0 percent. 4.5.2.2.1.1 Ü utDut l e v e l s . The t e r m i n a lo u t p u tv o l t a g el e v e l s s h a l l be measured u s i n g t h e t e s t c o n f i g u r a t i o n shown o nf i g u r e 12. The t e r m i n a lo u t p u t v o l t a g e s h a l l b e w i t h i n t h e r a n g e o f 6 .0 t o 9 . 0 V , p e a k - t o - p e a k ,l i n e - t o - l i n e , when measured a t p o i n t A o n f igure 12. --`,,``,-`-`,,`,,`,`,,`--- Provided by IHS No reproduction or networking permitted without license from IHS Not for Resale kIL-STD-1553B 21 S eptember 1978 T able II. C r i t e r i a f o r a c c e D t a n c e o r r e . i e c t i o n t e r m i n a l for t h en o i s er e . i e c t i o n test of a f TOTAL W R S RECEIVED BY THE TERMINAL OD ( i n m ultiples of 107) No. o f Errors heject ( Eaual o r l e s s 1 NIA NIA h/A A ccept (Eaual or morel O 1 2 3 4 5 6 7 8 9 10 11 N/A 1 /A 4 NIA 12 13 14 15 16 17 la - 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 .45 1.26 2.07 2.88 3.69 4.50 5.31 6.12 6.93 7.74 8.55 9.37 10.18 1 o. 99 11.80 4.40 5.21 6.02 6.63 7.64 8.45 9.27 10.08 12.61 13.42 14.23 15.04 15.85 16.66 17.47 18.29 19.10 19.90 20.72 21 -53 22.34 23.15 23.96 24.77 25.58 26.39 27.21 28.02 33-00 10.89 11.70 12.51 13-32 14.13 14.94 15.75 16.56 17-37 18.19 19.00 19.81 20.62 21.43 22.24 23.05 23.86 24.67 25.48 26.29 27.11 27.92 28.73 29.54 30.35 31.16 31 97 32.78 33 * 0 0 3 3-00 33 0 0 33.00 33.00 N/A *- 28 --`,,``,-`-`,,`,,`,`,,`--- c Provided by IHS No reproduction or networking permitted without license from IHS Not for Resale MIL-STD-1553B 21 September 1978 4.5.2.2.1.2 O utDut waveform. T he w aveform, when measured a t p o i n t A o n f i g u r e 12, s h a l l h a v ez e r oc r o s s i n gd e v i a t i o n s w hich a re e q u a l t o , o r l e s s t h a n , 25.0 n s from t h e i d e a l c r o s s i n g p o i n t , m e a s u r e d w i t h r espect t o t h e p r e v i o u s z e r o c r o s s i n g ( i - e . 1 -5 5 -025 P S, 1 - 0 2 .o25 ,us 1.5 2 .o25 u s a nd 2.0 2 .O25 p l . T he r ise a nd f a l l time o f t h i s w aveform s h a h b e f rom 100.0 t o 300.0 n s when m e a s u r e df r o ml e v e l so f 10 t o 9 0 p e r c e n t o f f u l l waveformpeak-to-peak, l i n e - t o - l i n e ,v o l t a g ea s shown on f i g u r e 13. Any d i s t o r t i o no f t h e waveform i n c l u d i n go v e r s h o o ta n dr i n g i n gs h a l ln o te x c e e d 2 300.0 mV p e a k , l i n e - t o - l i n e , a s m easured a t p o i n t A o n f i g u r e 12. Q utDut noise. Any n o i s et r a n s m i t t e d when t h e t e r m i n a l i s 4.5.2.2.1.3 r e c e i v i n g o r h as power removed, s h a l l n o t e x c e e d a v a l u e o f 5.0 m V , RMS, l i n e - t o - l i n e , a s m easured a t p o i n t A o n f i g u r e 12. O utDut svmmetrv. From t h e time b eginning 2.5 afterhe t mid-bit 4.5.2.2.1.4 c r o s s i n g o f t h e . p a r i t y b i t o f t h e l a s t word t r a n s m i t t e d by a t e r m i n a l , t h e maximum v o l t a g e a t p o i n t A o n f i g u r e 12, s h a l l b e no g r e a t e r t h a n t 90.0 mV p e a k ,l i n e - t o - l i n e . T h i s s h a l l be t e s t e d w i t h t h e t e r m i n a lt r a n s m i t t i n g t h e maximum number ofwords i t i s d e s i g n e d t o t r a n s m i t , up t o 33. T h i s t e s t s h a l l b e r u n s i x times w i t h each word i n a c ontiguousblockofwordshaving t h e same b i t p a t t e r n . T he s i x word c o n t e n t s t hat s h a l l b e u s e da r e 800016, 7 FFF16, 0 000 FFFFl 555516, a nd AAAA16. The O utput Of t htee r m i n a l s h a l l be a s s p e c l f l e d i n 6:5.2.2.1.1 a nd 4.5.2.2.1.2. 4.5.2.2.2 T erminal inDut c haracteristics. T he f o l l o w i n gc h a r a c t e r i s t i c ss h a l l b e m easuredindependently. 4.5.2.2.2.1 I nDut waveform ComDatibilitv. T he t e r m i n a ls h a l l be capable of r e c e i v i n ga n do p e r a t i n g w i t h t h e i n c o m i n gs i g n a l ss p e c i f i e dh e r e i n , and s h a l l a c c e p t waveform varying from a s q u a r e wave t o a s i n e wave w i t h a maximum z e r o of c r o s s i n g d e v i a t i o n from t h e i d e a l w i t h r e s p e c t t o t h e p r e v i o u s z e r o c r o s s i n g p l u s o r m inus 150 n s , ( i . e . , 2.0 t .15 P S 1.5 t .15 P S 1.0 2 .15 P S .5 2 .15 PS). The t e r m i n a l s h a l l r e s p o n d t o a n i n p u t s i g n a l whosepeak-to-peak i s w i t h i n t h e r angeof 1.2 t o 20.0 V . T he t e r m i n a l a m p l i t u d e ,l i n e - t o - l i n e , shall notrespondtoaninputsignal whosepeak-to-peakamplitude, l i n e - t o - l i n e , i s w i t h i n t h e r a n g eo f 0 .0 t o .28 V. T he v o l t a g e sa r em e a s u r e d a t p o i n t A o n f i g u r e 1 0. 4.5.2.2.2.2 Common mode r e . i e c t i o n s . Any s i g n a l sf r o m D C t o 2 .O MHz, w i t h a m p l i t u d e se q u a lt oo r l ess t han ,+ 10.0 V p eak,line-to-ground,measured at p o i n t A o n f i g u r e 1 0, s h a l l n o t d egrade t h e p erformanceof t h e r e c e i v e r . 4.5.2.2.2.3' J nDut imDedance. T he m agnitude of t he t erminalinputimpedance, h as p owerremoved, s h a l l b e a minimum o f when t h e RT i s n o t t r a n s m i t t i n g , o r 2000.0 ohms w i t h i n t h e f requencyrangeof 75.0 kHz t o 1 .0 MHz. Thisimpedance is thatmeasuredline-to-line a t p o i n t A o n f i g u r e 1 0. 4.5.2.2.2.4 B o i s er e i e c t i o n . T he t e r m i n a l s h a l l e x h i b i t a maximum word e r r o r r ate o f o n e p a r t i n 107, o n a l l w ordsreceived by t h e t e r m i n a l , a f t e r - v a l i d a t i o n c hecks a s s p e c i f i e d i n 4.4, when o p e r a t i n g i n t h e p resenceof a d d i t i v e white Gaussian noise distributed over a b andwidth o f 1.0 kHz t o 4.0 M z a t a n RMS a m p l i t u d e f 200 mV. A word e r r o r s h a l l i n c l u d ea n yf a u l t H o w hich c a u s e s t h e m e s s a g ee r r o r b i t t o b e s e t i n t h e t e r m i n a l ' s s t a t u s word, o r o ne w hich c a u s e s a t e r m i n a l t o n o t r e s p o n d t o a v a l i d command. The word e r r o r r a t e s h a l l b e.measured w i t h a 3..O V p e a k - t o - p e a k , l i n e - t o - l i n e , input to the 29 I . ~ --`,,``,-`-`,,`,,`,`,,`--- Provided by IHS No reproduction or networking permitted without license from IHS c Not for Resale p _" ' MIL-STD-1553B N O T I C E 2 M C W 7777933 0024878 2 W ' 1 t MIL-STD-15536 21 S eptember 1978 t e r m i n a l a s m easured a t point A o ni g u r e f 10. The n o i s e t e s t s s h a l l b e r u n continuouslyuntil,for a p a r t i c u l a r n u n b e r o f f ailures, t h e n unber o f w ords command a nd d ata w ords,exceedsthe r e c e i v e d b y t h e t e r m i n a l ,i n c l u d i n gb o t h r e q u i r e d number f o r a c c e p t a n c e o f t h e t e r m i n a l , o r i s l e s s t h a n t h e r e q u i r e d number f o r r e j e c t i o n o f t h e t e r m i n a l , a s s pecified i n t a b l e I I. A d atawords l l usedin t h e t ests s h a l l c o n t a i n random b i t p a t t e r n s . T hese b i t p a t t e r n s s h a l l b e u n i q u ef o r each d a t a word i n a m essage,and s h a l l c hangerandomlyfrom message t o inessage. R edundant d ata b usreauirements. If r edundant d ata b uses a r e u sed, t h e requirements as s p e c i f i e d i n the following s h a l l apply to those data buses. 4.6 E l e c t r i c a l i s o l a t i o n . A t e r m i n a l s s h a l l h ave a minimum o f 45 dB l l i s o l a t i o n b e t w e e n d ata b u s e s . I s o l a t i o n h ere means t h e r a t i o i n d b b etween t h e outputvoltageon t he a c t i v e d ata b u s a nd t h e o u t p u t v o l t a g e o n t he i n a c t i v e d a t a b u s . T h i s s h a l l b e m easuredusing t h e t e s t c o n f i g u r a t i o ns p e c i f i e di n 4.5.2.1.1 o r 4.5.2.2.1 f o r each d ata b u s . Hach d ata b u ss h a l l b e a l t e r n a t e l y a c t i v a t e d w i t h a l l m e a s u w n e n t s b e i n g t aken a t p o i n t A o n f i g u r e 12 f o r e ach d ata b u s . 4.6.1 S i n a l ee v e n tf a i l u r e s . A d ata b u s e s s h a l l b e r outed minimize l to the p o s s i b i l i t y that a s ingle e v e n t f a i l u r e t o a d a t a b u s s h a l l c a u s e t h e l o s s o f m orethan t h a t p a r t i c u l a r d a t a b u s . 4.6.2 4.6.3 D ualstandbvredundant d ata b us. t h e n i t s h a l l b e a d u a ls t a n d b yr e d u n d a n t f ollowingparagraphs. Data b u sa c t i v i t y .O n l yo n ed a t a e x c e p t a s s p e c i f i e d i n 4.6.3.2. If a d u a lr e d u n d a n t d ata b u s i s u sed, d a t a bus a s s p e c i f i e d i n t h e 4.6.3.1 4.6.3.2 b us c a n b e a c t i v e a t a n yg i v e n time Heset d ata b u st r a n s m i t t e r . If while o p e r a t i n g0 n . a command, a t erminal r e c e i v e s a n o t h e r v a l i d corncland, from e i t h e r d a t a b u s , i t s h a l l r eset a ndrespond t o t he new command on t he d a t a b u so n w hich t h e new command is r e c e i v e d . The t e r m i n a l s h a l l r e s p o n dt o t h e new command a s . s p e c i f i e di n 4.3.3.8. 5. D ETAIL HLQLiIREl4ENTS (Not A pplicable) Custodians : Army Navy Air - AS F orce - 1 1 - EL P r e p a r i n gA c t i v i t y : Air F orce 11 - P r o j e c t hISC-ODO3 Provided by IHS No reproduction or networking permitted without license from IHS Not for Resale --`,,``,-`-`,,`,,`,`,,`--- flIL-STD-1553B OTICE N 2 MC M 7 999933 0 0 2 4 8 7 9 4 m! 4 MIL-STD-I 553B 21 S eptember 1978 A PPEkIjIX IO. G e n e r a l . The f o l l o w i n g a r a g r a p h s n p i t h i s a ppendix a r e p r e s e n t e d n r d e r io a g e n e r a ls e n s e . They a re todiscusscertainaspectsofthestandardin i n t e n d e dt op r o v i d e a user o f t h e s t a n d a r d m o r e i n s i g h t i n t o t h e a spects discussea. IO. 1 R edundancv. It i s i n t e n d e dt h a tt h i ss t a n d a r d b e u sed t os u p p o r tr a t h e r i t h as b eenfound, t h a n t o s u p p l a n t t h e s ystemdesignprocess.However, throughapplicationexperienceinvarious aircraft, that the useof a d m 1 s tandby redundancy technique i s v e r y d esirable f o r u s e i n i n t e g r a t i n g m i s s i o n a v i o n i c s .F o rt h i sr e a s o n ,t h i sr e d u n d a n c y scheme i s d e f i n e d i n 4 .6 o f t h i s s t a n d a r d . None t h e l e s s , t h e s y s t e md e s i g n e rs h o u l du t i l i z e t h i s standard as t h en e e d so f a p a r t i c u l a ra p p l i c a t i o nd i c t a t e . T he u s eo fr e d u n d a n c y ,t h e degreetowhich i t i s i mplemented,and t h e f ormwhich i t t akes m ust b e d e t e r m i n e do na ni n d i v i d u a la p p l i c a t i o n b a s i s . F i g u r e s 1 0.1 a nd 1 0.2 i l l u s t r a t e some p o s s i b l ea p p r o a c h e st od u a lr e d u n d a n c y .T h e s ei l l u s t r a t i o n s a r e n o ti n t e n d e dt o b e i n c l u s i v e ,b u tr a t h e rr e p r e s e n t a t i v e . It s hould b e nòtedthatanalogousapproachesexist f o r t h e t r i p l e andquad r e d u n d a n t c ases. 10.2 b us c o n t r o l l e r . The bus c o n t r o l l e r i s a k ey p a r t o f t h e d ata b ussystem. The f u n c t i o n s o f t h e b u s c o n t r o l l e r , i n a d d i t i o n t o t h e i s s u a n c e o f commands, m u s t i n c l u d et h ec o n s t a n tm o n i t o r i n g o f t h e d ata b usandthe t r a f f i c o nt h e bus. I t i s e n v i s i o n e d t h a t m o s t o f' t h e r o u t i n e m i n u t e d e t a i l s o f b u s m o n i t o r i n g ( e .g , p a r i t y c h e c k i n g , t e r m i n a l n o n - r e s p o n s e t i m e - o u t , e t c . ) wl il b e e mbodied i nh a r d w a r e , w hile t h e a l g o r i t h m s f o r b u s c o n t r o l and d e c i s i o n making will r eside i ns o f t w a r e . It i s a l s oe n v i s i o n e dt h a t ,i ng e n e r a l ,t h e b u s c o n t r o l l e r will b e a g e n e r a l p u r p o s e a i r b o r n e c o m p u t e r w i t h a special i n p u t / o u t p u t (1/ci) t o i nterface w i t h t h e d ata b u s . I t i s o fextremeimportance i n b u s c o n t r o l l e r d e s i g n t h a t t h e b u s c o n t r o l l e r b e r e a d i l y a ble t o accommodate t e r m i n a l so fd i f f e r i n gp r o t o c o l ' sa n ds t a t u s word b i t s u sed. Equipment d e s i g n e d t o MIL-STD-1553A w l b e i n u s e f o r il a c o n s i d e r a b l ep e r i o do ft i m e ; thus, bus c o n t r o l l e r s m u s t b e capable of adjusting to their differingneeds. It i s a l s o i m p o r t a n t t o remember t h a t t h e b u s c o n t r o l l e r will b e t h e f o c a l pointformodification and growthwithin t h e m u l t i p l e xs y s t e m ,a n dt h u s the s o f t w a r e m u s t o e w r i t t e n i n s u c h a m anner a s t o p e r m i t m o d i f i c a t i o n w i t h r e l a t i v e e ase. . , Provided by IHS No reproduction or networking permitted without license from IHS Not for Resale --`,,``,-`-`,,`,,`,`,,`--- MIL-STD-1553B OTICE N 2 M C W 979791L 0 02'4900 7 W 1 Provided by IHS No reproduction or networking permitted without license from IHS --`,,``,-`-`,,`,,`,`,,`--- MIL-STD-1553B 2 1 S eptember 1978 BUS CONTROLLER BUS N O. 1 BUS NO. - W 2 - A REMOTE TERMINAL SUBSYSTEM . " T 1 FIGURE 1 0.1 . Z l l u s t r a t i o n o f D ossibleredundancy.. - ~ BUS _ _ N O. 1 - . -.BUS-._ ---.. . " RT RT " ..-.-. .- - "_ " " . . " .. SUBSYSTEM SUBSYSTEM 1F i g u r e 1 0.2 . " .. EMBEDDED RT CAPABILITY . . . . .. . NOTE: RT - Remote erminal T FIGURE.10.2. I l l u s t r a t i o n o f possible r e d u n d a n c y . Q I Not for Resale 10.3 M ultiplex r e l e c t i o n c riteria. The s e l e c t i o n o candidete r i g n a l e for f m ultiplexing is a f unction o t h e p a r t i c u l a r a p p l i c a t i o n i n v o l v e d , f a nd c riteria will i n general v ary fran s ystem t o s ystem.Obviously, those e i g n a l s which f havebandwidths o 4 00 Hz or less a re p rime candidates for i n c l u s i o n on t h e bus. I t is a lsoobviousthatvideo,audio,andhigh speed p arallel d i g i t a l s i g n a l s s h o u l d be e xcluded. f i e area of questionable a pplication i s u sually between 4 00 Hz a nd 3KHt bandwidth. The t r a n s f e r of these s i g n a l s an t h e d a t a b s in a p articular a pplicau bus will depend h e a v i l y upon the l oading of the t i o n . The decision must be b ased on p r o j e c t e d f u t u r e b s n eeds as w l as t h e u e l class of s i g n a l s which in g e n e r a l a re n ot euítable currentloading.Another f or m ultiplexing a re t hose which can be t y p i f i e d by a low r ate ( over a m ission) but possessing a h i g h p r i o r i t y or u rgency.Examples o s uch signala might be a f n uclear event d etector o utput or a missile l aunch alarm fran a w arning r e c e i v e r . Such s i g n a l s are u sually b etter l e f t h ardwired, but th,ey m ay be accommodated by t h e m u l t i p l e x s y s t e m i f a direct c onnection t o t h e b s u c o n t r o l l e r ' s i n t e r r u p t hardware i s u sed t o t r i g g e r a s o f t w a r e a c t i o n in r esponse t o t h e s i g n a l . 10.4 High reliability r equirements. The u se of simple p a r i t y f or e rror d e t e c t i o n w i t h i n the m ultiplex bus s ystem was d ictated by a a mpromise between t he n eed f o r reliable data t ransmission, system overhead, and r emote t r i a emn l s i m p l i c i t y . Theoretical and empirical e v i d e n c e i n d i c a t e s t hat an u ndetected b i t error r ate of 1 0-12 c an be e xpected fran a p ractical a l t i p l e x system b u i l t to t h i s s t a n d a r d . If a particularsignalrequires a b i t error r ate which is b etter t han that provided by the p arity checking, then it i s i ncumbent upon the s ystem designer t o provide the r e l i a b i l i t y w i t h i n the c o n s t r a i n t s of the s t a n d a r d or t o n o t i n c l u d e this s i g n a l w i t h i n the m ultiplexbussystem. A possible a pproach in this case would be t o h ave the s ignal s ource and sink provide appropriate error d etection and correction encoding/decoding and employ would be t o e x t r a d ata words t o t ransfer the information. Another approach p a r t i t i o n the niessage, transmit a p ortion a t a time, and t h e n v e r i f y ( by i n t e r r o g a t i o n ) t h e praper t r a n s f e r of each segment. S tubbinp.Stubbing is the method w herein a separate l i n e i s c onnected between the primary data b s l i n e and a t erminal. T e d irect c onnection of a u h stub l i n e c a u s e s a m ismatch which appears an the waveforms. T his mismatch c an be r educed by f i l t e r i n g a t t he r e c e i v e r and by u sing bi-phase m odulation. Stubs are o f t e n employed not only as a c onvenience i n b s l a y o u t b u t as a means u o f coupling a u n i t t o the l i n e i s uch a manner t hat a f a u l t on the s t u b or n t e r m i n a l wl n o t g r e a t l y a ffect the t r a n s m i s s i o n l i n e o p e r a t i o n . il In this case, a network i s employed i n the s t u b l i n e t o p r o v i d e i s o l a t i o n f o t h e rm the f a u l t . These n etworks are a l s o u sed f or s t u b s t hat are of s uch length that m ismatch and r e f l e c t i o n d e g r a d e s bus o peration. The preferred method of s tubbing is t o u setransformercoupled stubs, as d e f i n e d in 4.5.1.5.1. This method prcrrrides the b e n e f i t s o DC i s o l a t i o n , i n c r e a s e d 'common m d p rotection, f oe a d oubling of e ffective s t u b impedance,and f a u l t i s o l a t i o n f or t h e e n t i r e stub a nd terminal. Direct c oupled stubs, as d efined in 4.5.1 5.2 of this s tandard, should be a voided i f a t all p ossible. Direct c oupled stubs provide no DC i s o l a t i o n QT common mode r e j e c t i o n for the terminal e x t e r n a l t o i ts s ubsystem. F u r t h e r , any s h o r t i n g f a u l t between the s u b s y s t e m s i n t e r n a l i s o l a t i o n resistors ( u s u a l l y on a c i r c u i t b o a r d ) and the main bus junction wl c a u s e f a i l u r e of il t h a t e n t i r e bus. I t c an be e xpected t hat when the direct c oupled stub length u exceeds 1.6 f eet, t hat it w i l l b egin t o d istort t h e main b s waveforms. Note t h a t t h i s l e n g t h i n c l u d e s the cable r u n s i n t e r n a l t o a g iven subsystem. 10.5 . --`,,``,-`-`,,`,,`,`,,`--- 33 Not for Resale Provided by IHS No reproduction or networking permitted without license from IHS IIIL-STD-1553B APPENDIX 8 S eptember 1986 4 1. 0 6 Ose of b r o a d c a s t o p t i o n . The use of a b roadcast message as d efined in 43367 .... o f t h i s s t a n d a r d represents a s i g n i f i c a n t d e p a r t u r e €ran t h e basic p hilosophy of t h i s s t a n d a r d i n t h a t it is a m essageformatwhich does n ot u p r o v i d ep o s i t i v e closed-loop c o n t r o l of b s t r a f f i c . The systemdesigner is a trongly encouraged to s olve a nydesign problems t hrough the use o t h e three f basic m essage f o n n a t s w i t h o u t r e s o r t i n g t o u se of t h e broadcast o ption. If 8ystem d e s i g n e r s do choose t o u se t he b roadcast command, they should carefully consider t he p o t e n t i a l e f f e c t s of a missed broadcast m essage,and t h e subor error r ecovery design in t h e remote tersequent implications for fault minals a nd bus c o n t r o l l e r s . 1. 0 7 O t h e r r elated d ocuments. Several documents e x i s t which are r elated t o this s tandard. MIL-HDBK-1553 describes i mplementation p ractices f o r this s tand ard arid o t h e r r elated data. T hî6 s tandard i s e bdd in or r eferenced by t h e moi e f o l l o w i n gi n t e r n a t i o n a l documents: NATO STANAG 3838, ASCC Air S tandard 50/2, a nd UK DEF STAN 00-18 (PART P ) / I s s u e 1 . 20. REFERENCED DOCUMENTS * lot applicable. 30. GENERAL REQUIREMENTS 3. 0 1 O p t i o ns e l e c t i o n . This s ection o the a p p e n d i xs h a l l s elect t hose f f options required to f u r t h e r d e f i n e p o r t i o n s o the s tandard to e nhance tris e r v i c ei n t e r o p e r a b i l i t y .R e f e r e n c e s i n p arentheses are t o p aragraphs in this s tandard w hich are a f f e c t e d . 3. 0 2 A pplication.Section 3 0 of this a ppendix s h a l l a pply t o all d ualstandby redundantapplications for t he A rmy, Navy, and A i r Force. A l l A i r Force a ircraft i n t e r n a l a v i o n i c s a p p l i c a t i o n s s h a l l be d ual standby redundant, except where s a f e t y c r i t i c a l or f l i g h t c ritical r equirements d ictate a h i g h e r l e v e l of r edundancy. ' 30.3 Unique address ( 4.3.3.5.1.2). A r emoteterminals s h a l l be capable o l l f b eingassignedanyunique address fran decimal address O ( 00000) t hrough . decimal address 30 (11110). The address shall be e s t a b l i s h e d t hrough an e xternal c onnector, which is p r of the s ystem wiring and connects at t o the r emote terminal. C hanging the u nique address of a remote t e r m i n a l s h a l l n o t r e q u i r e t he p h y s i c a l m o d i f i c a t i o n or m anipulation o any part of the r emote terminal. f T he r emote terminal s h a l l , as a m n m m d etermine and v alidate i t s address iiu, d uring power-up conditions. No s i n g l e p o i n t f a i l u r e shall c ause a t erminal t o v alidate a f alse address. The remote terminal s h a l l n otrespond t o any messages i f it has d etermined i t s u nique address i s n o t v alid. Supersedes p age 34 d ated 12 February 1980. --`,,``,-`-`,,`,,`,`,,`--- Provided by IHS No reproduction or networking permitted without license from IHS 34 Not for Resale MIL-STD-15538 APPENDIX 8 September 1 986 * * 30.4 M d c odes ( . . . . . ) oe 433517 3.. 041 Subaddress/mode ( . . . . . ) 433514. An RT s h a l l have t h e c a p a b i l i t y t o r espond to m d d e s w ith both subaddress/mode of O0000 and 1 1111. oe Bus c o n t r o l l e r s s h a l l have t h e c a p a b i l i t y t o i s s u e mode commands w ith both 8ubaddress/mode o f O0000 a nd 1 1111. T hesubaddress/mode of O0000 a nd 1 1 1 1 1 shall n ot convey d i f f e r e n t i n f o r m a t i o n . 3.. 042 R equired m ode codes ( . . . . . ) 433517 A n RT * --`,,``,-`-`,,`,,`,`,,`--- 3... 0421 Remote t e r m i n a l r equired mode codes, f ollowing mode codes as a minimum: Mode C o d e s h a l l implement the F unction T ransmit s tatus word Transmitter shutdown Override transmitter s hutdown Reset r emote terminal O001 o 00100 0 0101 01000 * * 3... 0422 Bus c o n t r o l l e r r equired m d codes. The bus c o n t r o l l e rs h a l lh a v e oe t h e c a p a b i l i t y t o i mplement all o f t he m d codes as d efined in 433517 oe ...... For A i r Force a p p l i c a t i o n s , t h e dynamic b s c o n t r o l p u rode cormand s h a l l n e v e r be i s s u e d by t h e bus c o n t r o l l e r . 3.. 043 Reset remote t erminal ( . . . . . . ) 4335179. An RT r eceiving the reset r emote terminal mode code s h a l l r espond w i t h a s t a t u s word as s p e c i f i e d 4335179 ...... a nd then reset. While the RT i s b eing reset, the RT s h a l l r espond t o a v a l i d command with any of t he f ollowing:noresponse on either d a t a bus, s t a t u s word t r a n s m i t t e d w i t h the b usy b i t set, or normal response. I f a ny d ata i s t r a n s m i t t e d fran the RT w hile it is b eing r eset, the i nformation code shall content of the data s h a l l be v alid. An RT r e c e i v i n g t h i s mode complete the reset f unction within 5.0 m illiseconds following transmission of t h e s t a t u s word s p e c i f i e d i n 4 - 3 51 79 .3 . .. The time shall be measured fran t h e mid-bit z e r o c r o s s i n g o the p a r i t y b i t of the s t a t u s word to t he m id-sync f zero crossing of -the command word a t p o i n t A o n figures 9 a nd 10. .in .. . * 3.. 044 I n i t i a t e RT s e l f t est ( . . . . . . ) 4335174. I f the i n i t i a t e s e l f t est m d oe c amand i s i mplemented i n t he RT, . then the RT r e c e i v i n g the i n i t i a t e s e l f test m o d e code s hall r espond w i t h a s t a t u s word as s p e c i f i e d in 4335174 ...... a nd may t e r m i n a t e t h e n i n i t i a t e the RT s e l f t est f unction. Subsequent v a l i d commands t h e s elf-test f unction. While the RT s elf t est is i n p r o g r e s s , the RT s h a l l r espond t o a v a l i d command w ith any of t he f ollowing: no response on e ither d ata bus, s t a t u s word t r a n s m i t t e d w i t h the b usy b i t set, or normal response. I f any d ata i s t r a n s m i t t e d from t h e R T while it i s i n s e l f t est, the i nformation content of the d ata s h a l l be v alid. A n RT r e c e i v i n g this mode code shall c omp lete the self test f unction andhave the r e s u l t s of t h e self t est a v a i l a b l e within 100.0 m illiseconds following transmission of the s tatus word s pecified in 4335174 ....... T he time s hall be m a s u r e d from t he m id-bitzerocrossing of t he p a r i t y b i t of the s t a t u s word t o the mid-sync zero crossing of the command word a t p o i n t A on f i g u r e s 9 a nd 10. SuEiersedes page 3 5 d ated 12 F ebruary 1980. 35 Provided by IHS No reproduction or networking permitted without license from IHS Not for Resale dp L ~ NIL-STD-3553B N O T I C E 2 M C I_ 7 777733 0 0 2 4 7 0 4 q MIL-STD-15538 ..i. ‘. APPENDIX 8 September 1986 30.5 S t a t u s word b its ( . . . . ) 43353 3.. 051 I nformationcontent. The s t a t u s word transmitted by a n - R T e h a l l c o n t a i n v alid i nfonnation a t a l l t imes, e.g., following RT power u p, during i n i t i a l i z a t i o n , and U i n g normal o peration. * 30.5.2 S t a t u s b i t r equirements ( . . . . ) 43353. b i t s as follows : An RT s h a l l implement t h e s t a t u s Message error b i t ( . . . . . ) 433533 433534 Instrumentation b i t ( . . . . . ) - R equired - Always logic zero - O ptional Servicerequest bit (.....) 433535 Reserved s t a t u s b its ( . . . . . ) 433536 Broadcast command received b i t broadcast o ption, then this b i t shall be r equired. - Always l o g i c z e r o (.....) 433537 - I f the RT implements t he - I --`,,``,-`-`,,`,,`,`,,`--- Busy b i t ( . . . . . ) 433538 - As r e q u i r e d by 30.5.3 - s u b s y s t e m f l a g b i t (.....) 433539 I f an associated s ubsystem has t h e c a p a b i l i t y f or self t est, t h e n this b i t shall be r equired. Dynamic b s c ontrol acceptance b i t ( . . . . . 0 u 4335311 If the RT i mplements t he dynamic b s c o n t r o l f u n c t i o n , t h e n u t h i s bit shall be r equired. T erminal f l a g b i t ( . . . . . 1 433531) If an RT has t he c a p a b i l i t y f or s e l f t est, $ hen t h i s b i t s hall be r equired. - * 3.. 053 Busy b i t ( . . . . . ) 433538. The e x i s t e n c e of busy conditions i s d iscouraged. However, any.busycondition, i n t h e RT or the s ubsysteminterface t h a t w ould a ffect communication over the b s shall be conveyed v ia the b usy u b i t . Busy conditions, and t hus t he s e t t i n g of the busy b i t , s h a l l o ccuronly as a r e s u l t of p a r t i c u l a r commands/messages s e n t t o an RT. Thus f o r a nonf ailed RT, t he b us controller can, with p rior knowledge of the remote terminal c h a r a c t e r i s t i c s , d e t e r m i n e when the remote t a i a can become b usy and when it e sn l w i l l n o t be pUsy. However, the RT may a l s o set the busy b i t ( i n a d d i t i o n t o e e t t i n g t h e t r i a f l a g b i t or s ubsystem flag b i t ) as a r esult of f a i l u r e / emn l f a u l t c o n d i t i o n s within the RT/subsystem. 3. 06 Broadcast ( . . . . ) 43367. T e o nly broadcast oommands a llowed t o be h transmitted on the data b s by t he b u s c o n t r o l l e r shall be the broadcast m ude u c a m a n d s i d e n t i f i e d in table 1. The broadcast o ption may be i mplemented i n remote terminals. However, i f i mplemented, t he RT s hall be c a p a b l e - o f d i s t i n g u i s h i n g b etween a broadcast a nd a n on-broadcast message t o the same subaddress f or non-mode command messages. The RT address of 1 1 1 1 1 i s still r e s e r v e d f o r broadcast and s h a l l n o t be u sed f or any other p urpose. * 36 Provided by IHS No reproduction or networking permitted without license from IHS Not for Resale XIL-STD-15538 APPENDIX 8 S eptember 1986 D ata map-around (4.3.3.5.1.4). Remote terminals a hall p rovide a r eceive s ubaddress to which one to N d ata words of any b i t p a t t e r n c a n be received. Remote t e r m i n a l s a h a l l p r o v i d e a t ransmit subaddress f r m which a rninimum of H d a t a words c an be t ransmitted. N i s e qual t o the rrraximum word count from t h e s et of a l l m essages d e f i n e d f o r t h e RT. A v a l i d r e c e i v e message t o the d ata m ap-around receive subaddress followed l a v alid t ransmit aommand g t o t h e data wrap-around t r a n s m i t subaddress, w i t h t h e same word c ount and without any i n t e r v e n i n g v a l i d oommands to t h a t RT, shall c ause the RT to r espond with each d ata word h aving t h e same b i t p a t t e r n as the c orresponding transmit s ubaddress o 30 f r e c e i v e d d ata word. A d ata w raparound receive and (11110) i s desired. 30.7 * * RT t o RT v a l i d a t i o n ( 4.3.3.9). For RT t o RT transfers, in a d d i t i o n to t h e if a v a l i d r eceive command i s r eceived v a l i d a t i o n c riteria s pecified in 4.4.3.6, by t h e RT a nd the f irst data word i s r eceived a fter 57.0 p l u s or minus 3.0 m icroseconds, the RT s h a l l c o n s i d e r the message i n v a l i d and r espond as s p e c i f i e d in 4.4.3.6. The time s hall be m asured f o the m id-bit zero crossing rm of the p a r i t y b i t o the r eceive command t o the mid-sync z e r o c r o s s i n g of the f irst f e xpected d ata word a t p o i n t A a s shown cm f i g u r e s 9 a nd 1 0, It i recommended s t h a t the r eceiving RT of an RT t o RT transfer v e r i f y the proper O ccurrence of t h e t r a n s m i t cuumand word a nd s t a t u s word as s p e c i f i e d in 4.3.3.6.3. 30.9 3 0.10 * E lectrical characteristics ( 4.5) !&e cable s h i e l d shall p rovide a minimum Of * * 3 0.10.1 Cable s h i e l d i n g ( 4.5.1.1). 90.0 p ercent coverage. 3 0.10.2 S hielding ( 4.5.1). A cable to c onnectorjunctions, l l cable term inations, and bys-stub.junctions s h a l l have continuous 3 60 degree s h i e l d i n g which s h a l l p rovide a minimum o 75.0 p ercent coverage. f 3 0.10.3 C onnector polarity. For a p p l i c a t i o n s t hat use c oncentricconnectors o r i n s e r t s f or each bus, t he c e n t e r p i n of the c onnector or i n s e r t s hall be u sed f or the h igh(positive)Manchesterbi-phasesignal. The i n n e r r i n g s h a l l be u s e d f o r the low ( negative) Manchester bi-phase signal. * * C haracteristic impedance ( 4.5.1.21. The a c t u a l ( not n ominal) charact eristic impedance of the data b s cable s hall be w ithin the r ange o 70.0 ohms u f to 85.0 ohms a t a s inusoidal frequency of 1.0 m egahertz. 30.10.4 37 Provided by IHS No reproduction or networking permitted without license from IHS Not for Resale --`,,``,-`-`,,`,,`,`,,`--- Message formats ( 4.3.3.6). Remote terminals shall, as a minimum, formats as d e f i n e d in 4.3.3.6: implement the f ollowing non-broadcast message RT to BC t r a n s f e r s , B t o RT t r a n s f e r s , RT t o RT t r a n s f e r s ( receive and 2 t r a n s m i t ) , and arode command w i t h o u t d ata word transfers. For n on-broadcast messages, the RT shall n o t d i s t i n g u i s h between d ata r eceived during a BC t o RT t r a n s f e r or d ata r eceived during a RT t o RT t r a n s f e r ( receive) t o the same subaddress. The RT s h a l l n o t d i s t i n g u i s h between data to be t r a n s m i t t e d during an RT t o BC t r a n s f e r or d ata to be t ransmitted during an RT t o RT t r a n s f e r ( transmit) f ran the s ~ m e ubaddress. B s c o n t r o l l e r s shall h ave t h e s u c a p a b i l i t y to i s s u e all message formats defined in 4.3.3.6. 30.8 e& ~ U - S T D - 1 S53B APPENDIX 8 September 1986 3.05 01. S tubcoupling ( . . . ) 4515. For Navy a p p l i c a t i o n s , each terminal a h a l l have both t ransformer and d irect coupled stub c o n n e c t i o n s e x t e r n a l l y a v a i l a b l e . Por r p y e ystems using these terminals, e ither t ransformer o d irect o oupled mv r connections may be u sed. For Army and A i r Force a p p l i c a t i o n s , e a c h terminal s h a l l h ave transformer coupled stub c onnections, but may a lso h ave direct c oupledstubconnections. For Army a nd A i r Force s ystems,onlytransformer coupled s t u b c o n n e c t i o n s s h a l l be used. Unused terminal c onnections shall have a minimum of 7 5 p ercent shielding coverage. 3.06 01. Power m/off n oise. A terminal shall l m t any s puriousoutputduring ii -igure p12. mV eak, f + 90 a power-up or power-down sequence. The maximum allowable o utput noise amplit ude s hall be $250 mV peak, l i n e - t o - l i n e f or t ransformer c oupled s t u b s and line-to-line f or d irect c oupled s tubs, m easured a t p o i n t A of " 38 Provided by IHS No reproduction or networking permitted without license from IHS Not for Resale --`,,``,-`-`,,`,,`,`,,`--- ...
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