Function 0x42?

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Mar 2, 2021, 10:14:21 AM3/2/21

to modbus-tk

New to modbus.

Working with PZEM004Tv (datasheet)

and test code (pzem-004.py)

Board functions correctly

There is a write_single_register call to set the alarm threshold, but how to send the function 0x42 to reset the energy accumulator is my question??