old_contents: #!/usr/bin/python
  import minimalmodbus
  from time import sleep
  ADDRESS1 = 1
  ADDRESS2 = 2
  
  minimalmodbus.CLOSE_PORT_AFTER_EACH_CALL = True
  sensor = minimalmodbus.Instrument('/dev/ttyUSB5', slaveaddress=ADDRESS1)
  print("writing new address: " + str(ADDRESS2))
  sensor.write_register(0, value=ADDRESS2, functioncode=6)
  
  sleep(0.2)
  sensor = minimalmodbus.Instrument('/dev/ttyUSB5', slaveaddress=ADDRESS2)
  print("reading address from holding register: ")
  print(sensor.read_register(0, functioncode=3))
  
  print("writing new address: " + str(ADDRESS1))
  sensor.write_register(0, value=ADDRESS1, functioncode=6)
  
  sleep(0.2)
  sensor = minimalmodbus.Instrument('/dev/ttyUSB5', slaveaddress=ADDRESS1)
  print("reading address from holding register: ")
  print(sensor.read_register(0, functioncode=3))
  
new_contents: #!/usr/bin/python
  
  """Looks for sensor with ADDRESS1 and changes it's address to ADDRESS2 then changes it back to ADDRESS1""" 
  
  import minimalmodbus
  import serial
  from time import sleep
  ADDRESS1 = 1
  ADDRESS2 = 2
  
  minimalmodbus.CLOSE_PORT_AFTER_EACH_CALL = True
  minimalmodbus.PARITY=serial.PARITY_NONE
  minimalmodbus.STOPBITS = 2
  minimalmodbus.BAUDRATE=19200
  
  minimalmodbus.CLOSE_PORT_AFTER_EACH_CALL = True
  sensor = minimalmodbus.Instrument('/dev/ttyUSB5', slaveaddress=ADDRESS1)
  sensor.debug=True
  print(("reading address: ") + str(sensor.read_register(0, functioncode=3)))
  print("writing new address: " + str(ADDRESS2))
  sensor.write_register(0, value=ADDRESS2, functioncode=6)
  
  sleep(0.2)
  sensor = minimalmodbus.Instrument('/dev/ttyUSB5', slaveaddress=ADDRESS2)
  print("reading address from holding register: ")
  print(sensor.read_register(0, functioncode=3))
  
  print("writing new address: " + str(ADDRESS1))
  sensor.write_register(0, value=ADDRESS1, functioncode=6)
  
  sleep(0.2)
  sensor = minimalmodbus.Instrument('/dev/ttyUSB5', slaveaddress=ADDRESS1)
  print("reading address from holding register: ")
  print(sensor.read_register(0, functioncode=3))
  
subject: Add utility for address change functionality testing