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Null modem - Wikipedia
Crossover or "Null Modem" vs. Straight Through Serial Cable - Decisive Tactics, Inc.
What is a null modem cable? Is it different to a straight through? - Quora
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Null-Modem Serial Cables
USB To Null Modem FTDI Serial Adapter, 18-in. | Eaton
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Null Modem DB9 Male to Female - 22 AWG Plenum Jacket - Serial Data Cab - Custom Cable Connection
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Null Modem Adapter RS232 DB-25 Male to DB-25 Female