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VIATOR USB HART Interface - - Amazon.com
USB HART modem - 277
Amazon.co.jp: USB Hart Modem WS232UP USB To Hart Protocol Modem Hart Transmitter HART Convertor With 24VDC & Built-in Loop Resistor Temperaturer Controller : パソコン・周辺機器
USB Hart Modem WS232UP Hart-USB Modem Hart Transmitter With Built-in 24VDC Loop Resistor Hart Communicator 475 375 Modem Modem
Amazon.com: GLTL Integrative USB Hart Modem USB to Hart Protocol Modem Hart Transmitter HART Convertor(Suitable for All Devices Which Support Hart Protocol) : Electronics