StarTech.com USB to RS232/RS485/RS422 Industrial 4 Port Serial Hub Adapter - USB to Serial Converter - ICUSB234854I - USB Adapters - CDW.com
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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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