How to calculate Energy readings from the raw data on an Power Meter

Question

I\'m IoT newbie and I have a project with Schneider Power Meter. I read voltage raw data from registers using pymodbus but I don\'t know how to convert it to the co

Answer 1

Still, I'm waiting for your code, but with my guess, you will need like the following stuff:

Reading and decoding:

from pymodbus.constants import Endian
from pymodbus.payload import BinaryPayloadDecoder
from pymodbus.client.sync import ModbusTcpClient

def validator(instance):
    if not instance.isError():
        '''.isError() implemented in pymodbus 1.4.0 and above.'''
        decoder = BinaryPayloadDecoder.fromRegisters(
            instance.registers,
            byteorder=Endian.Big, wordorder=Endian.Little
        )   
        return float(decoder.decode_32bit_float())

    else:
        # Error handling.
        print("There aren't the registers, Try again.")
        return None


client = ModbusTcpClient('X.X.X.X', port=502)
connection = client.connect()

if connection:
    request = client.read_holding_registers(3927, count=2, unit=1)
    data = validator(request)
    print(data)

    client.close()

else:
    print('Connection lost, Try again')

---

[NOTE]:

Your data either is float32 or float32_inverse.

• Thus, with the float32 you will have:

   wordorder=Endian.Big
  

• And with the float32_inverse you will have:

   wordorder=Endian.Little