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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3in1 USB 232 485 TO RS485 / USB TO RS232 / 232 TO 485 converter adapter ch340 WITH LED Indicator for WIN7,XP,Linux PLC - AliExpress
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