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This is an industrial USB to RS485 converter with original FT232RL inside. It features embedded protection circuits such as lightning-proof, resettable fuse, ESD protection, and TVS diode, etc. It's pretty small in size.



  • USB to RS485 communication
  • Adopt original FT232RL, fast communicating, stable and reliable, better compatibility
  • Onboard TVS (Transient Voltage Suppressor), effectively suppress surge voltage and transient spike voltage in the circuit, lightning-proof & anti-electrostatic
  • Onboard self-recovery fuse and protection diodes, ensures the current/voltage stable outputs, provides over-current/over-voltage proof, improves shock resistance
  • 3 LEDs for indicating the power and transceiver status


  • Product type: industrial converter
  • Baudrate: 300-921600bps
  • Host port: USB
  • Device port: RS485
  • USB:
    • Operating voltage: 5V
    • Connector: USB-A
    • Protection: 200mA self-recovery fuse, ESD protection
    • Transmission distance: about 5m
  • RS485:
    • Connector: screw terminal
    • Pins: A+, B-, GND
    • Direction control: hardware automatic control
    • Protection: 600W lightning-proof 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
  • Operating system: Mac, Linux, Android, WinCE, Windows 10 / 8.1 / 8 / 7 / XP

User guide

Driver installation

  • Connect the module to host PC, check Device Manager, if the device is listed with the yellow exclamation mark, it means that the driver was not installed.
USB TO RS485-2.png
  • Download the driver form #Resources, unzip, and install it.
  • After installing, you can find that the mark disappeared and a COM device is listed
USB TO RS485-9.png


  • You should prepare two RS485 device
  • Connect A+ to A+, B- to B-, and connect them to host PC.
Run SSCOM software to test.
USB TO RS485-10.png
  • Expected result
USB TO RS485-11.png



If you encounter a system other than Windows that cannot be used normally, you can go to the official website link below, install the corresponding system driver and use it:


Multi-system compatibility, support Win7/8/8.1/10, Mac, Linux, Android, WinCE and other systems.


Remove the 120 ohm termination matching resistor from RS485.


No support, only USB to one of the three, USB to RS232, RS485 or TTL.


No, RS232, RS485 and TTL cannot be converted to each other, but USB to RS232, RS485 or TTL is supported.



If you require technical support, please go to the Support page and open a ticket.