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Serial Port 9 Pin Null Modem Adapter DB9 Male / Female RS232
Amazon.com: USB to RS-232 DB9 Female 9 Pin Null Modem Rollover Serial Adapter Cable for Windows,Linux MAC OS (Null Modem) : Electronics
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Amazon.com: StarTech.com 10' RS232 Serial Null Modem Cable - Null modem cable - DB-9 (F) to DB-9 (F) - 10 ft (SCNM9FF) : Electronics
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C2G DB9 Male to DB9 Female Null Modem Adapter 1 Pack 1 x 9 pin DB 9 RS 232 Serial Male 1 x 9 pin DB 9 RS 232 Serial Female Beige - Office Depot