Tripp Lite 18in USB to Null Modem Serial Adapter FTDI w/ COM Retention M/F 18" - serial adapter - USB - RS-232 - U209-18N-NULL - USB Adapters - CDW.com
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1Pcs Mini Null Modem DB9 Female Male plug Adapter Gender Changer cross female to female/male to male RS232 serial Connector - AliExpress
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Amazon.com: DB9 Null Modem Adapter Male to Female Slimline Data Transfer Serial Port Adapter Gold Plated 2 Pack : Electronics
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