kod

import serial
import time

try:
  ser = serial.Serial( # set parameters, in fact use your own :-)
    port="COM8",
    baudrate=19200,
    bytesize=serial.EIGHTBITS,
    parity=serial.PARITY_NONE,
    stopbits=serial.STOPBITS_ONE
  )
  ser.isOpen() # try to open port, if possible print message and proceed with 'while True:'
  print ("port is opened!")

except IOError: # if port is already opened, close it and open it again and print message
  ser.close()
  ser.open()
  print ("port was already open, was closed and opened again!")
command = ''
time.sleep(1.8)
command = str('r')
command += str('\n')
ser.write(command.encode(encoding = 'ASCII', errors = 'strict'))  
ser.write(command.encode(encoding = 'utf8', errors = 'strict'))  
ser.write(b'R\n')
time.sleep(2)
data = ser.readline()
print(data)