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USB to Serial Converter - TRENDnet TU-S9
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Replace PL2303 USB TO TTL 232 RS232 Serial Port CH340 for arduiuo PIC AVR Modbus | eBay
CH340 CP2102 FTDI USB RS485 Isolated Serial Adapter Module Converter Modbus Communication Cable
MicroLink-HM+ USB/RS-485/RS-232 HART Modem with Modbus Accumulator – Microflex
