What is null modem? Null Modem cable vs Straight serial cable
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C2G 1.5ft USB to DB9 Serial Cable - RS232 Adapter Cable - Serial adapter - USB - RS-232 - blue | Dell USA
3ft (0.9m) DB9 M/F Serial RS232 Extension Cable - Black | Serial RS232 | Computer Cables | USB and PC
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Amazon.com: StarTech.com 2m Black Straight Through DB9 RS232 Serial Cable - DB9 RS232 Serial Extension Cable - Male to Female Cable (MXT1002MBK), 6.6 ft / 2m : Electronics