meter.py

#!/usr/bin/python3
import serial
from serial import Serial
from flask import request, redirect
import logging
import time

@app.route('/meter', methods = ['POST'])
def meter():
  UnitID = request.form['UnitID']
  Address = request.form['Address']
  Quantity = request.form['Quantity']
  FC = request.form('FunctionCode')

#slaveID = (0x48)
#FC = (0x03)
#StartAdd_H = (0x00)
#StartAdd_L = (0x66)
#Register_H = (0x00)
#Register_L = (0x01)
  CRC_L = (0x6A)
  CRC_H = (0x4C)

ser = serial.Serial('/dev/ttyUSB0', 1200, parity=serial.PARITY_EVEN)
#print(ser)

data = ([UnitID,FC,Address,Quantity,CRC_L,CRC_H])
#data = ([slaveID,FC,StartAdd_H,StartAdd_L,Register_H,Register_L,CRC_L,CRC_H])
data_bytes = serial.to_bytes(data)

while 1:
      x=["x[1]","x[2]","x[3]","x[4]","x[5]","x[6]","x[7]","x[8]"]
      y=["y[1]","y[2]","y[3]","y[4]","y[5]","y[6]","y[7]","y[8]"]
      for i in range (1,8):
          ser.write(data_bytes)
          ser.send_break(0.1)
          time.sleep(0.1)
          x[i] = ser.readline(1)
          y[i] = int.from_bytes(x[i],byteorder = 'big')
          #v = ((y[4]*256)+y[5])/100
          print(y[i])