DB9/DB25 Serial (RS232) Female Loopback Tester Adapter - CablesOnline TS-LB02 These loopback testers help diagnose problems with DB9 or DB25 Serial RS232 interfaces. Pinout: For DB9 side: (1 - 4 - 6), (2 - 3), (7 - 8) For DB25 side: (2 - 3), (4 - 5), (6 - 8 - 20)
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