In RTU Master Mode, the RTU master device accesses the TCP slave device through
the gateway.
RTU master device sends request to gateway;
○
1
Gateway forwarding request to TCP slave device;
○
2
TCP slave device returns a response;
○
3
The gateway sends back the response.
○
4
The parameters of the RTU master are as follows:
Communication port: COM1
Baud rate: 115200
Parity bit: None
Data bit: 8
Stop bit: 1
The parameters of the TCP slave are as follows:
IP address: 192.168.1.80
Slave ID: 1
TCP port number: 501
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 COM1 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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