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Serial/Rs-232 Interfacing
Detailed explanations on interfacing the serial port.
http://www.beyondlogic.org/serial/serial.h...
Keith's RS-232 Library
Documentation with download.
http://www.ent.ohiou.edu/~welker/rs232/
RS-232 Diagnosis Tech Bulletin From Mike Sandman
RS-232 Serial Communications is not that hard.
http://www.sandman.com/rs232.html
HW Server
Overview of the RS-232 standard and cabling.
http://www.hw-server.com/rs232
Quick Reference
For RS485, RS422, RS232 and RS423.
http://www.rs485.com/rs485spec.html
The RS232 Standard
A tutorial with signal names and definitions.
http://www.camiresearch.com/Data_Com_Basic...
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