132B_1_Recitation2_RS232_Introduction

132B_1_Recitation2_RS232_Introduction - EE132B - Recitation...

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EE132B - Recitation 2 RS232 Introduction Prof. Izhak Rubin [email protected] Electrical Engineering Department UCLA 1
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A Standard • Definition: – A standard is a set of conventions that is designed to resolve equipment incompatibilities, as well as to coordinate data transmission between senders and receivers. • The devices in a network are divided into 2 main categories – DTE: Data Terminal Equipment, such as a computer. – DCE: Data Communications Equipment, such as a modem. 2
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RS232 RS232 RS-232 (Recommended Standard 232) is a standard for serial binary data signals connecting between a DTE (Data terminal equipment) and a DCE (Data Circuit-terminating Equipment). It is commonly used in computer serial ports. In its simplest it dictates how computers and modems communicate. Physical layer: where transmission of data between devices is defined. RS232 dictates 4 types of specifications (Spec) Mechanical : 25 pin connector, physical dimension of plug and connectors, assignments of circuits to pins. Electrical : “ON” if voltage < -3V; “OFF” if voltage > 4V.
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This note was uploaded on 01/12/2011 for the course EE 132B taught by Professor Izhakrubin during the Fall '09 term at UCLA.

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132B_1_Recitation2_RS232_Introduction - EE132B - Recitation...

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