Question

Hi all

I am using a RUT240 (firmware RUT2_R_00.07.02.6) with the Modbus funcionality. Reading data acc. to the wiki is working just fine, however setting parameters does not seem to work as expected.

Example: Switch mobile data connection register address 204 (one register), Function Code 03, returns an error. See attached screenshot for raw communication.

The RUT240 responds with error code 02 (illegal data address), therefore I assume there is an issue with this register in the RUT240?

Thanks!

David

Answer 1

Hello,

Based on data provided here, MODBUS register 204 is not available to get information. It is used for setting device parameters. Besides, function code 3 is used to read holding registers, to set register values code 6 has to be used.

Using the following configuration with internal RUT240 MODBUS TCP Master application available to download in Package manager I was able to successfully disable mobile data with the following MODBUS request configuration and reenable it by replacing 0 to 1:

Best regards,