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Option EP factory configure the WattNode® Modbus meter to even parity with eight data bits and one stop bit (E81).

If you have meters that were ordered without Option EP and you need even parity, it can be field configured using the ParityMode (1654) register, which has the following settings:

  • 0 – N81 (no parity, one stop bit)
  • 1 – E81 (even parity, one stop bit)

If you have a meter ordered with Option EP and need to turn off the even parity, it can be overridden or turned off in the field by changing the the ParityMode register. However, you will need to configure your Modbus master device to use even parity in order to write a new value to the ParityMode register.


  • The WattNode Modbus with no options defaults to RS-485 communication with no parity, eight data bits, and one stop bit (N81).
  • Setting all the DIP switches to the OFF (0) position for ten seconds will reset all communications settings to the settings as shipped from the factory. So if you cannot communicate with a meter and suspect a communication setting has been changed in software (baud rate, parity, etc.), you can set all the DIP switches to zero for ten seconds, then change the DIP switches to assign a valid address and the desired baud rate. Then try communicating with the meter.

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