MPP solar PIP-1012-MSE interfacing

SolarInterface.py

#!/usr/bin/python3

## which serial port the MPP Solar inverter is connected to
serial_port = '/dev/ttyS0'

###
import serial ## provided by 'pyserial' from pip
import crc16 ## provided by 'crc16' from pip
import sys ## inbuilt library

def send(ser, command) :
        ## convert the command to bytes
        command_bytes = command.encode('utf-8')
        ## calculate the CRC16 checksum of the command
        crc = crc16.crc16xmodem(command_bytes).to_bytes(2, 'big')
        ## add the CRC and a carrige-return to the command
        command_send = command_bytes + crc + b'\r'
        ## send the command
        print('Sending: ' + str(command_send))
        ser.write(command_send)
        ## flush the serial buffer to make sure the command is sent
        ser.flush()

## open the serial port as 2400-8-N-1
serial_connection = serial.Serial(serial_port, 2400, timeout = 1)

## send the command passed as the first command-line argument
send(serial_connection, sys.argv[1])

## get the response
response = serial_connection.readline()[:-1]

## get the response checksum
checksum_received = response[-2:]

## get the response data and convert it to a string
data = response[1:-2].decode('utf-8')

## calculate the response checksum
checksum_actual = crc16.crc16xmodem(response[:-2]).to_bytes(2, 'big')

## print the response if the checksum is ok
if checksum_received == checksum_actual:
        print('Data: ' + str(data))
else:
        print('ERROR: Checksum mismatch!')

For example, use the QPIGS command to get current inverter status.