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In telecommunications, RS-232 is a standard for serial binary data interconnection between a DTE (Data terminal equipment) and a DCE (Data communication equipment). It is commonly used in computer serial ports. A similar ITU-T standard is V.24. RS is an abbreviation for "Recommended Standard".

Scope of the standard


The Electronic Industries Alliance (EIA) standard RS-232-C as of 1969 defines:
  • Electrical signal characteristics such as voltage levels, signaling rate, timing and slew-rate of signals, voltage withstand level, short-circuit behavior, maximum stray capacitance and cable length
  • Interface mechanical characteristics, pluggable connectors and pin identification
  • Functions of each circuit in the interface connector
  • Standard subsets of interface circuits for selected telecom applications

The standard does not define such elements as character encoding (for example, ASCII, Baudot or EBCDIC), or the framing of characters in the data stream (bits per character, start/stop bits, parity). The standard does not define bit rates for transmission, although the standard says it is intended for bit rates less than 20,000 bits per second. Many modern devices can exceed this speed (38,400 and 57,600 bit/s being common, and 115,200 and 230,400 bit/s making occasional appearances) while still using RS-232 compatible signal levels.

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Computer Tips - RS-232 was created for one purpose, to interface between data terminal equipment and data communications equipment employing serial binary data interchange.

HW Server - Overview of the RS-232 standard and cabling.
Meta Description: [ RS232 - overview of RS-232 standard - HW serever, serial, interface, ]

Keith's RS-232 Library - Documentation with download.

Quick Reference - For RS485, RS422, RS232 and RS423.

RS-232 Diagnosis Tech Bulletin From Mike Sandman - RS-232 Serial Communications is not that hard.

Serial/Rs-232 Interfacing - Detailed explanations on interfacing the serial port.
Meta Description: [ Describes interfacing the Serial (RS-232) Port in relation to both Hardware and Software. Gives Practical Examples using CDP6402 UART and Software Examples in C. ]

The RS232 Standard - A tutorial with signal names and definitions.
Meta Description: [ Tutorial discussion of the RS232 (EIA232) standard with signal names, definitions, and examples. ]

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