Zephyr MODBUS samples

[Tiit]

Hi

We wan't use in our project some MODBUS sensors and I found, that Nordic Connect SDK (I use version 1.9.1) with Zephyr has support for MODBUS. I tried the samples (rtu- server and rtu-client), but I don't get  them work. They  compile OK and if I look with logic analyzer, client is asking and the server is answering with right data and frames, but client shows always:

Everything is connected as it should (server is answering). Has anyone tried the MODBUS samples and get them to work?

I add also logic analyzer images:

That is the client asking

And server answers:

Tiit

[Tiit]

I forgot to mention, that I use RS232 and not RS485 and the DE pin is commented out in app.overlay.

Tiit

[dejans]

Hi Tilt,

Which board are you using?

Best regards,
Dejan

[Tiit]

Two NRF52840-DK -s

Tiit

[dejans]

Hi Tiit,

Do you have Driver Enable (DE) pin commented out on both boards i.e. on both server and client side?

Best regards,
Dejan

[Tiit]

Yes :

&arduino_serial {

    status = "okay";

    modbus0 {

        compatible = "zephyr,modbus-serial";

        label = "MODBUS0";

        status = "okay";

        //de-gpios = <&arduino_header 15 GPIO_ACTIVE_LOW>;  /* D9 */

    };

};

 

Tiit