3onedata GW11 Series User Manual page 44

TCP master device sends request to gateway;
○
1
Gateway forwarding request to RTU slave device;
○
2
RTU slave device returns a response;
○
3
The gateway sends back the response.
○
4
The parameters of the TCP master are as follows:
Slave ID: 2

TCP port number: 502

The parameters of the RTU slave are as follows:
Communication port: COM 2

Baud rate: 115200

Parity bit: None

Data bit: 8

Stop bit: 1

Operation steps
The screenshot reference model for this manual is GW1108-8D (3IN1) Modbus. Other
types of products in addition to supporting the serial type (RS-232, RS-422, RS-485), and
the number of network ports and the number of serial ports are different, the interftions are
the same.
Step 1 Connect the COM serial port of the computer and the COM2 serial port of the Modbus
gateway using a cable or a converter.
Step 2 Configure the IP address of the Modbus gateway.
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(I)GW11XX Modbus User Manual
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