Can't switch on/off wifi using modbus on RUT241

[PMM]

Hello

I try to use modbus in order to switch on or off wifi on a RUT241 router. To do so I use the mbpoll tool on Ubuntu.
I manage to read data, eg name of the device, but I can’t write any data.

For example in the documentation (RUT241 Modbus - Teltonika Networks Wiki) the register number for Wifi is 204, but:
mbpoll -t 4 192.168.1.1 -a 1 204 1
return
Write output (holding) register failed: Illegal data address

Have you any clue about this issue?

Philippe

[Daumantas]

Hello,

I’ve tested this functionality using the Modbus Master on the device, and everything seems to be working correctly. Could you try setting up Modbus Master using the following parameters:

Then press Save & Apply, re-open the instance and press the TEST button for the created configuration?
Additionally, from what I found online, it seems like the mbpoll service uses Modbus Register Number rather than Modbus Register Address, so please try using 203 instead of 204.
Finally:

• Make sure that Modbus Slave is enabled on the device;

• Make sure function 6 is used to write the value 1;

Best regards,

[PMM]

Hello

With the Modbus Master service on the device I was able to make the change, but I can’t do it remotly.
I try the address register and the register number.
The issue can come from the client I used (mbpoll). Have you a client that work?

[Daumantas]

Hello,

You could try using the built-in Modbus Master instance (specify the IP as 127.0.0.1). Additionally, QModMaster is also a good application for testing Modbus Slave devices.

Best regards,

[PMM]

Hi

Writing my own code solve the issue

Thanks for your help

Philippe