Read data via RS-458 modbus from pzem-003 module

Module datasheet:

https://solar-thailand.com/pdf/PZEM-003-Manual.pdf

https://de.aliexpress.com/item/32912901621.html

Wiring:

Modbus addresses

RegAddr	Description	Resolution
0x0000	Voltage value	1LSB correspond to 0.1V
0x0001	Current value	1LSB correspond to 0.1A
0x0002	Power value low 16 bits	1LSB correspond to 0.1W
0x0003	Power value high 16 bits
0x0004	Energy value low 16 bits	1LSB correspond to 1Wh
0x0005	Energy value high 16 bits
0x0006	High voltage alarm status	0xFFFF is alarm 0x0000 is not alarm
0x0007	Low voltage alarm status	0xFFFF is alarm 0x0000 is not alarm

Install requirements with:

pip install -r requirements.txt

Run with:

    python modbus-pzem-003.py 
    Voltage: 8.88 V
    Current: 0.77 A
    Power: 0.68 W
    Energy: 0.02 WH

• if you get a "serial.Serial" Argument error, please uninstall libraries "serial" and "pyserial" with pip uninstall serial pip uninstall pyserial
• then run pip install -r requirements.txt again
• if you are running under Windows, please replace the

instrument = minimalmodbus.Instrument('/dev/tty.usbserial-120', SALVE_ADDRESS)

with

instrument = minimalmodbus.Instrument('COMx', SALVE_ADDRESS)

replacing x with the actual COM-Port number of your PC interface