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DB9 D Sub Connector 9 Pin Connector to Screw Terminals RS232 Serial Port Adapter | eBay
Rocstor Premium 5ft 1 Port USB to Null Modem RS232 DB9 Serial DCE Adapter Cable with FTDI
Amazon.com: ASHANT D-SUB 9 PIN 9P DB9 Female to RJ9 RJ10 RJ11 4P4C Plug RS232 Serial Communication Cable, RJ9 RJ11 to COM DB9 Female Connect KABLE (Size : 1M, Color : Wiring