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National Devices
NCD209
Whos Controlling Your World?
Phone: [phone] Fax: [phone] Email: [e-mail]
P.O. Box 455 Osceola, MO 64776
Device Description: NCD209
SCAM is a 8-pin preprogrammed microcontroller based on the PIC12C671/672 core, and is available in DIP and SOIC packages. SCAM is programmed to position two hobby servo motors and control a single logic-level output. SCAM accepts RS-232 commands at 9600 baud and is E3C compliant, allowing user-control of 256 different SCAM chips or other devices using a single RS-232 serial port.
BYTE BUGS: SCAM
Current Pricing in US Dollars: NCD209
Package Type
DIP SOIC
Qty 1-9
$10 $11
Qty 10-25
$9.00 $10.00
Qty 26-100
$8.10 $9.10
Qty 101+
MARKET PRICE MARKET PRICE
Example Device Wiring: NCD209
SCAM, shown at left, is easily connected to the serial port of your computer using only a 22K Ohm resistor. SCAM requires a regulated +5 volt power supply. SCAM has a single logic-level output (TTL/CMOS 0/+5 volt), and two servo motor outputs. A 220 Ohm current limiting resistor should be connected between the output of the chip and servo motor as show in the diagram. An 8 MHz ceramic resonator is connected to the OSC lines of the SCAM chip. When power if first applied, both motors are centered, and the processor waits for command packets while controlling the servos. The program within this CPU uses a time share algorithm for accepting commands and controlling the servo motors and the logic-level output. Because of this, it is possible for command packets to be missed. While infrequent, it may be necessary to duplicate the transmission of some commands before a reaction can be realized.
+5
+5 OSC
CR1
DB9 Female: Solder Side Connect to any Available RS-232 Serial Port. GND SV1 SV2 DO
OSC RSI Logic Level Output
Pin
1 2,3 4 5
Label Function
+5 OSC RSI DO SV2 SV1 GND Connect to Regulated +5 Supply 8 MHz Ceramic Resonator Connection RS-232 Data Input, 9600 bps, 8,N,1 TTL/CMOS Logic Level Output Bit Servo Motor Control Output 2 Servo Motor Control Output 1 Ground
+5
CR1: 8 MHz Ceramic Resonator Center Lead Connects to Ground Not Polarity Sensitive Device Number 0-255 Programmed Into Device at Time of Purchase
SERVO SERVO
6 7 8
Recommended Usage
This device is provided with programming examples for the following systems. If programming examples are not provided for the Basic Stamp, then it is NOT RECOMENDED for use with this device at this time. E3C Compliance allows 256 Devices to interface to a single serial port. QBasic Compatible Visual Basic 6 Pro Yes Basic Stamp II Compatible Basic Stamp II SX E3C Compliance Compatible Yes
Page 23
www.controleverything.com
National Control Devices
NCD209
Whos Controlling Your World?
Phone: [phone] Fax: [phone] Email: [e-mail]
P.O. Box 455 Osceola, MO 64776
Programmers Notes
The SCAM chip supports eleven commands for controlling two servo motors, a logic level output, and all network communication functions. The SCAM chip is designed to accept ASCII character codes as commands, easily generated by any programming language that supports serial communications. To send a command to the SCAM chip, you must first send ASCII character code 254 to place the device in command mode. Once in command mode, any of the commands listed in the table below may be issued. Some E3C commands have parameters, used to control which device you are speaking to. To set the position of servo motor 1, ASCII character codes 254 and 1 must be received by the SCAM chip, a Parameter is also required (0-255) to set the position of the Servo motor. To conclude transmission to the SCAM chip, a terminator byte, 85, must be received by the SCAM chip. You do NOT need to send ASCII character code 85 to terminate an E3C command (Commands 248-253). Similarly, Command 2 is used to control the position of Servo motor 2. Command 0 is used to control the position of BOTH servo motors. Commands 3 and 4 set the status of the AUX output bit. The program within this CPU uses a time share algorithm for accepting commands and controlling the servo motors and the logic-level output. Because of this, it is possible for command packets to be missed. While infrequent, it may be necessary to duplicate the Command Parameter Description transmission of some commands before a re0 0-255, Set Servo Both Positions: Servo1, Servo2 action can be realized. 0-255 Send TWO Parameters for This Command E3C compliance allows 256 devices to share a single serial port. Some E3C commands re1 0-255 Set Servo 1 Position quire a parameter, indicating a specific device 2 0-255 Set Servo 2 Position number to speak to. In most applications, E3C command 252 will be the only command you 3 None Turn ON Aux Data Output Bit will ever need. All other commands are provided for network compliance purposes only. 4 None Turn OFF Aux Data Output Bit Command 252 is used to speak to an individ248 None E3C: Enable All Devices ual device, and turn all others off.
P ROGRAMMING S C A M
249 250 251 252 253
None 0-255 0-255 0-255 0-255
E3C: Disable All Devices E3C: Enable Selected Device E3C: Disable Selected Device E3C: Enable Selected Device, Disable All Other Devices E3C: Disable Selected Device, Enable All Other Devices
To send E3C command 252 to the SCAM chip, send ASCII character code 254 to put the SCAM chip in command mode. Next send ASCII character code 252, followed by a third parameter indicating which device should be active. All subsequent commands will only be acknowledged by the selected device. Note that E3C device numbers are programmed into the chip at the time of purchase. Once programmed, they cannot be changed.
Example Software Notes
Example communication software for this device was written under Visual Basic 6 Professional. communication software for this device was written under Visual Basic 6 Professional. Example source code can be downloaded from our web site at www.controleverything.com. If you Program areProgrammingBasic Programmer, Program Description NOT a Visual Source code can be viewed using a text editor such as Language Notepad or WordPad. Source code is clearly commented for easy migration to other languages.
Basic Stamp II Programming Basic Stamp II SX Language QBasic Basic Stamp II VisualStamp 6 Pro Basic Basic II SX QBasic Visual Basic 6 Pro NONE Program NONE NONE AB.ZIP NONE NONE BUGS.ZIP
Anabug has not been tested with the Basic Stamp II
Program Description
Anabug has not been tested with the Basic Stamp II SX Coming Soon been tested with the Basic Stamp II SCAM has not Simple has not been tested with the Basic Status of SX5 Inputs SCAM Program Graphically Displays the Stamp II all Coming Soon Simple Program Graphically Displays the Status of Servos and TTL.
Availability
SCAM will begin shipping February 1, 2000.
Page 24
www.controleverything.com
National Control Devices
NCD209
Whos Controlling Your World?
Phone: [phone] Fax: [phone]...