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    Modbus RTU slave device not communicating

    Mervis
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    • G
      GrahamCC last edited by

      Hi,

      I am having trouble getting a modbus slave to communicate with a Unipi Neuron.
      The slave unit is a Parker inverter drive.
      I have been trying to read a single holding register:
      slave address 01
      function code 03
      read offset 1004

      I can read the register fine using a different device (programmed via codesys) but the unipi does not seem to be getting a response.

      I am writing '13' to 'Neuron S10x_UART_config_1.01' to set baud at 9600
      Watching the port monitor shows the sent message looks correct but it times out with no response. the timeout is set to 1000ms.

      Any ideas?

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      • P
        pascal @GrahamCC last edited by

        Hi

        @GrahamCC
        I am having the same trouble.
        Could you find a solution for this problem?

        Thanks

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        • T
          tomas_hora administrators @pascal last edited by

          Hello @pascal and @GrahamCC,

          please check the latest step by step manual for RS485 guide. Make sure to also check the parity (which must be set through the uart_config variable)

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          • P
            pascal @tomas_hora last edited by

            @tomas_hora where can i find this manual?
            Parity is set correct.

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            • T
              tomas_hora administrators @pascal last edited by

              @pascal http://downloads.unipi.technology SW-Mervis

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