Industrial Modbus RS485 to USB Adaptor

£23.60 (Inc. VAT)
£19.67 (Ex. VAT)
50.00 Grams
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Modbus RS485  to USB Adaptor, used to allow emonPi / emonBase / RaspberryPi + emonSD to read from SDM120 electricity meter




Baudrate: 300-921600bps

Host port: USB

Device port:  RS485


  • Operating voltage: 5V
  • Connector: USB-A
  • Protection: 200mA self-recovery fuse, ESD protection
  • Transmission distance: about 5m


  • Connector: screw terminal
  • Pins: A+, B-, GND
  • Direction control: hardware automatic control
  • Protection: 600W lightningproof and surge-suppress, 15KV ESD protection (onboard 120R balancing resistor)
  • Transmission distance: about 1200m (low rate)
  • Transmission mode: point-to-multipoints (up to 32 nodes, it is recommended to use repeaters for 16 nodes or more)

LED indicators:

  • PWR: red power indicator, light up when there is USB connection and voltage is detected
  • TXD: red TX indicator, light up when the USB port sends data
  • RXD: red RX indicator, light up when the device ports send data back

Operating environment:

  • Temperature: -15℃ ~ 70℃
  • Humidity: 5%RH ~ 95%RH


Use emonHub to read data via ModBus and post to Emoncms

Windows driver (not required for Linux emonPi / emonBase)