StarTech.com 2m Black Straight Through DB9 RS232 Serial Cable - DB9 RS232 Serial Extension Cable - Male to Female Cable (MXT1002MBK), 6.6 ft / 2m

C2G/Cables to Go 02781 DB9 F/F Serial RS232 Mini Gender Changer (Coupler)

StarTech.com DB9 RS232 Serial Null Modem Cable F/F - DB9 Female to Female - 9-Pin RS232 Null Modem Cable, 2-Meter, Black (SCNM9FF2MBK)

CablesOnline DB9 Null Modem Male to Female Slimline Data Transfer Adapter/Gender Changer , (2-Pack) (AD-N04M-2)

SIENOC 5pcs 9 Pin RS-232 DB9 Male to Male 5pcs Female to Female Serial Cable Gender Changer Coupler Adapter Pack of 10

StarTech.com Slimline Serial DB9 Gender Changer - M/M (GC9SM)

Your Cable Store 6 Foot DB9 9 Pin Serial Port Cable Male / Male RS232

BeElion 2PCS Serial RS232 DB9 Pin Gender Male to Male Adapter,Null Modem Gender Connectors

DB9 null modem male to female slimline data transfer serial port adapter 2 Pack

SIENOC 9 Pin RS-232 DB9 Male to Male/Female to Female Serial Cable Gender Changer Coupler Adapter (5 packs of male)

Tripp Lite Keyspan High-Speed USB to Serial Adapter, PC & Mac (USA-19HS)