RS-232 Diagnosis Tech Bulletin From Mike Sandman RS-232 Serial Communications is not that hard. http://www.sandman.com/rs232.html

Quick Reference For RS485, RS422, RS232 and RS423. http://www.rs485.com/rs485spec.html

Computer Tips RS-232 was created for one purpose, to interface between data terminal equipment and data communications equipment employing serial binary data interchange. http://www.ctips.com/rs232.html

RS-232 Protocols and computer networks, by Dr. D. Koren of Tel-Aviv University. http://www.rad.com/networks/1995/rs232/rs232.htm

Keith's RS-232 Library Documentation with download. http://www.ent.ohiou.edu/~welker/rs232/

Serial/Rs-232 Interfacing Detailed explanations on interfacing the serial port. http://www.beyondlogic.org/serial/serial.htm

The RS232 Standard A tutorial with signal names and definitions. http://www.camiresearch.com/Data_Com_Basics/RS232_standard.html

HW Server Overview of the RS-232 standard and cabling. http://www.hw-server.com/rs232

Micro Channel Linux Home Page From Christophe Beauregard. http://www.dgmicro.com/mca/