GCAN-204 Modbus RTU to CAN converter

Brand: GCAN
Model: GCAN-204
The serial communication device is connected to CAN-bus;
PLC connection CAN-bus;
Modbus RTU and CAN communication;
CAN-bus and serial bus gateway;
Monitor industrial site network data;
Beginners learn CAN;
CAN industrial automation control system;
Collect low-speed CAN network data.

Product Introduction


The GCAN-204 is a CAN to Modbus RTU Slave Converter with one Serial interface and one CAN interface. It allows user to connect some Modbus Master (for example: PLC, HMI, etc) with an existing CAN network.
It has integrated isolation protection module and easier to install with DIN-rail.

CAN connectorOpen terminal block
CAN interfaceCAN 2.0A, CAN 2.0B, conform to ISO11898-2
CAN baud rate5kbit/s to 1Mbit/s
Serial interfaceOpen3 terminal block
Serial baud rate600bps~115200bps
IsolationDC 1500V electrical isolation
Modbus slave function code03H, 04H, 06H, 16H
Size (LxWxH)113 x 100 x 21 mm
Operating temperature-40°C~85°C
Humidity15 to 95% non-condensing
InstallationDIN rail
Power supply
Voltage9~30V DC
Current20mA, 24V DC

The GCAN-204 converter is a standard Modbus Slave station. It will load the data received on CAN bus into the register (address) and wait for the instructions sent by Modbus Master station to read.
When the converter receives the reading instruction, it will send the data from specified register (address) to the Modbus Master station.
When the converter receives the sending instruction, it will progress the Modbus data and send to CAN bus.


  • Modbus slave support function code: 03H, 04H, 06H, 16H;
  • Serial baud rate: 600bps ~ 115200bps;
  • CAN-Bus supports CAN2.0A and CAN2.0B frame format, conform to ISO/DIS 11898 standards;
  • CAN baud rates: 5Kbps ~ 1Mbps;
  • CAN-Bus isolation module insulation voltage: DC 1500V;
  • Power supply: 9~30V (20mA,24V DC);
  • Interface using terminal blocks;
  • Installation method: DIN rail;
  • Working temperature range from -40 to 85 °C;
  • Size: (L)113mm * (W)100mm * (H)21mm.
Our Service

Standard package: Carton
Delivery Time
2~5 days after receipt of your payment by air express
After-sale service
GCAN provide one year free after-sales warranty, lifetime free software and technical support.
User Manual(Click to view)

GCAN-204 (CAN to Modbus RTU) converter