USB TO RS232/485

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USB TO RS232/485
USB TO RS232-485.jpg

RS232, RS485





USB TO RS232/485 is a USB to RS232/485 non-isolated serial port converter, featuring the original FT232RNL chip for improved stability and compatibility. It comes with a built-in self-recovering fuse, TVS protection circuit, etc. USB TO RS232/485 offers simple operation, zero-delay automatic transmission and reception conversion, and boasts characteristics such as fast, stable, reliable and safe communication.


  • Onboard Original FT232RNL chip. Fast communication, stable and reliable, better compatibility.
  • Onboard TVS (Transient Voltage Suppressor), effectively suppresses surge voltage and transient spike voltage in the circuit, lightning-proof & anti-electrostatic.
  • Onboard self-recovery fuse and protection diodes, ensure the current/voltage stable outputs, provide over-current/over-voltage proof, and improve shockproof performance.
  • Onboard RS232/485 communication switching circuit, configured by switch.
  • Onboard 120R terminal resistor on the RS485 interface, enabled/disabled via switch.
  • 3x LEDs for indicating the power and transceiver status.
  • ABS case design, small in size, easy to use, portable and cost-effective.


Model USB to RS232/RS485
Host Interface USB
Device Interface RS232/RS485
USB Interface Operating Level 5V
Interface Type-A male
Protection 200mA self-recovery fuse
Transmission Distance About 5m
RS232 Interface Interface Screw Terminal
Transmission Distance About 15m
Transmission Mode Point to Point
Baud Rate 300 bps ~ 921600bps
RS485 Interface Interface Screw Terminal
Direction Control Hardware automatic control
Protection Provide TVS diode protection, anti-surge, and ESD protection (onboard 120R resistor)
Transmission Distance About 1200m (at low rate)
Transmission Mode Point to multi-point (up to 32 nodes, add the relay for up to 16 nodes)
Baudrate 300 bps ~ 921600bps
Indicator PWR Red power indicator, connect to USB, light on when the voltage is detected
TXD Transmitting indicator, green light is on when data is sent from the USB interface
RXD Receiving indicator, blue light is on when the data is sent back from the device interface
Usage Environment Temperature Range -15℃ ~ 70℃
Humidity Range 5% ~ 95%RH
OS Mac, Linux, Android, Windows 11 / 10 / 8.1 / 8 / 7

Onboard Interface

USB TO RS232-485 Interface.png


USB TO RS232-485 Dimensions.jpg

Driver Installation

USB Driver Installation

  • Download the VCP Driver.
  • Double click on CDM212364_Setup.exe and install it.
  • Click on Extract, and then "NEXT".

USB TO 4CH Serial Converter -03.png

  • Click on I accept this agreement, and then click on "NEXT", and click on "Finish".

USB TO 4CH Serial Converter -04.png

  • After connecting the PC, you can see the usable COM port number in the device manager.

USB TO RS232-485 Driver-3.jpg

Hardware Test

Test environment: PC (Windows)
Required accessories:

  • USB TO RS232/485 x 2pcs
  • USB-A male-to-female cable x 1 (or directly connect to the USB port of the computer)
  • Wires

RS232 Test

  • Connect the RS232 interface of the USB TO RS232/485 module to the RS232 interface, that is, RXD and TXD are connected in a staggered manner, GND and GND are connected, and the toggle switch on top of the module is switched to RS232, and the connection diagram is referenced as follows:

USB TO RS232 Test.png

  • Open two SSCOM windows and the corresponding COM port numbers.

USB TO RS232 Test02.jpg

  • Select the baud rate as 115200, input the characters to be sent, check show time and package, and click on Open COM:

USB TO RS232 Test03.jpg

  • Set the two SSCOM windows sending at 100ms intervals, and then you can see the 2 Windows send and receive data normally, the effect as shown below:

USB TO RS232 Test30.jpg

RS485 Test

  • Connect the RS485 connector of the USB TO RS232/485 module, that is, A+ --> A+, B- --> B-, GND --> GND, and switch the toggle switch on it to RS485, the connection diagram is referenced below:

USB TO RS485 Test.png

  • Open two SSCOM windows on the PC and the corresponding COM ports:

USB TO RS232 Test02.jpg

  • Select the baud rate as 115200, input the characters to be sent, check show time and package, and Open COM.

USB TO RS232 Test03.jpg

  • Select one SSCOM, send it at 100ms intervals, and then you can the 2 Windows send and receive data as shown below:

USB TO RS232 485 test06.jpg



Software & Driver


Technical Support

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