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'Unable to read data from transport connection error..' while reading holding registers

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Anonymous
2017-06-13
2017-06-13

  • Anonymous

    Anonymous - 2017-06-13
    Post awaiting moderation.

    • Rossmann Engineering

      Rossmann Engineering - 2017-06-13

      Hi could you try to set the "unitIdentifier" to "0" or "0xFF" (Try both)

       

      • Anonymous

        Anonymous - 2017-06-14
        Post awaiting moderation.

        • Rossmann Engineering

          Rossmann Engineering - 2017-06-15

          Yes the UnitIdentifer is not needed for ModbusTCP, only for Modbus RTU.

          It is specified to set the unitidetifier for ModbusTCP to "0" of "0xFF".

          However I experienced some problems with a ModbusServer to set it to "0", thats why I changed the default setting to "1". But I think I will change that in the future again to meet the specification.

           

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