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http://www.ctips.com/rs232.html

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

HW Server

http://www.hw-server.com/rs232

Overview of the RS-232 standard and cabling.

Keith's RS-232 Library

http://www.ent.ohiou.edu/~welker/rs232/

Documentation with download.

Quick Reference

http://www.rs485.com/rs485spec.html

For RS485, RS422, RS232 and RS423.

RS-232

http://www.rad.com/networks/1995/rs232/rs232.htm

Protocols and computer networks, by Dr. D. Koren of Tel-Aviv University.

RS-232 Diagnosis Tech Bulletin From Mike Sandman

http://www.sandman.com/rs232.html

RS-232 Serial Communications is not that hard.

Serial/Rs-232 Interfacing

http://www.beyondlogic.org/serial/serial.htm

Detailed explanations on interfacing the serial port.

The RS232 Standard

http://www.camiresearch.com/Data_Com_Basics/RS232_standard.html

A tutorial with signal names and definitions.