- Quick Reference - http://www.rs485.com/rs485spec.html
For RS485, RS422, RS232 and RS423.
- Computer Tips - 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.
- RS-232 - http://www.rad.com/networks/1995/rs232/rs232.htm
Protocols and computer networks, by Dr. D. Koren of Tel-Aviv University.
- 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.
- HW Server - http://www.hw-server.com/rs232
Overview of the RS-232 standard and cabling.
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