4 Port Professional RS-232 USB 2.0 to Serial Adapter w/Nuts
Cable AK-CO-02 USB / RS-232
2-Port USB to RS-232 Serial Adapter Cable
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Amazon.com: StarTech.com USB to Serial Adapter - 1 Port - COM Port Retention - Texas Instruments TIUSB3410 - USB to RS232 Adapter Cable (ICUSB2321X),Black : Electronics