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Crossover or "Null Modem" vs. Straight Through Serial Cable - Decisive Tactics, Inc.
The main differences between RS-232, RS-422 and RS-485
Building the Null Modem Cable
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Should I Use Null Modem or Straight Through Serial Cables? - NI
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All you have to learn about serial connector pinouts
Null modem - Wikipedia
10 ft DB9 RS232 Serial Null Modem Cable - DB9 Cables & DB25 Cables | StarTech.com
Serial Port and Modem Cables
