Amazon.com: StarTech.com 3m RS232 Serial Null Modem Cable, Crossover Serial Cable w/Al-Mylar Shielding, DB9 Serial COM Port Cable Female to Male, Compatible w/DTE Devices, Black, F/M (9FMNM-3M-RS232-CABLE) : Electronics
Tera Grand - 6 FT USB C to RS232 Serial DB9 Cable with Thumbscrews
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SF Cable, 6 ft DB9 F/F Null Modem Cable RS232 - Walmart.com
Rocstor Premium 5ft 1 Port USB to Null Modem RS232 DB9 Serial DCE Adapter Cable with FTDI
StarTech.com 10 ft DB9 RS232 Serial Null Modem Cable F/M - SCNM9FM - Serial Cables - CDW.com