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Null Modem Cable Serial RS232 9 Pin DB9 Male to Female Gender Changer Lead UK 8944849703093 | eBay
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3ft (0.9m) Serial RS232 DB9 Null Modem Cable with Low Profile Connectors M/M - In-Wall CMG-Rated | Serial RS232 | Computer Cables | USB and PC
Null modem - Wikipedia
Serial Cable DB9, Female/Female, 6ft - Null Modem Cable
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 | www.publicsector.shidirect.com