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Interfacing The Serial / RS-232 Port
Wiring A Simple Null Modem – tommycoolman
RS232 serial null modem cable wiring and tutorial
Serial Port and Modem Cables
How to Build a Null Modem Cable - Tech Spirited
All you have to learn about serial connector pinouts
Null Modem Cable Specification
Crossover or "Null Modem" vs. Straight Through Serial Cable - Decisive
