EasyModbusTCP/UDP/RTU .NET / Discussion / General Discussion: 'Unable to read data from transport connection error..' while reading holding registers

Anonymous - 2017-06-13

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- Rossmann Engineering - 2017-06-13
  
  Hi could you try to set the "unitIdentifier" to "0" or "0xFF" (Try both)
  
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  - Anonymous - 2017-06-14
    
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    - 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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'Unable to read data from transport connection error..' while reading...

Modbus TCP, UDP and Modbus RTU client/server library

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

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

Modbus TCP, UDP and Modbus RTU client/server library

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