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Amazon.com: StarTech.com 6 ft Professional RS422/485 USB Serial Cable Adapter w/ COM Retention (ICUSB422) : Electronics
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USB 2.0 to RS-232 / RS-422 / RS-485 Selectable Industrial Serial Adapter w/ 15kV ESD Surge Protection - Coolgear
USB 2.0 to RS485/RS422 RS-485/RS-422 serial cable converter FT23 [PAUB003D] - $18.99 : Sintech Eshop!, The World of PC Adapter Card
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Amazon.com: ATEN USB to RS422 RS485 2 Port Plug-and-Play Adapter Converter UC485, up to 921.6 Kbps, Supports Windows Vista / 7 and Above, Mac and Linux, Terminal/Echo Mode by Mode, UK, 1
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