How can i write a modbus register through MQTT?

Teltonika Networks
1

Hello!

Firmware version: RUT9_R_00.07.06.5
Router: RUT950 (i have another one RUT956 but i think is the same)

I configured the following:

  • modbus TCP Client1 => reg1: 16bit integer READ /
  • modbus TCP Client2 => reg2: 16bit integer WRITE /
  • and data to server

The result is like this, after I customized the message:
/topicRUT950
reg1 = {“data”: 100, “server_name”: Modbus_Test_1, “Request name”: Reg1}
reg2 = {“data”: OK, “server_name”: Modbus_Test2, “Request name”: Reg2}

I have that "ok"on reg2 writing and I don’t know where it comes from because it is an integer.

how do I send a message through mqtt to write a variable on modbus?

Thanks

2

see my post link

4

Hello,

As another user pointed out, this can be done via scripts. However, an easier option would be to use Modbus MQTT Gateway. Configuration examples for each can be found here:

This can be used to write/read Modbus registers on the RUT device itself, as well as any connected devices.
Hope this helps!

Best regards,

5

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