code: def serial_disconnect(self):
  		
  		if self._serial_connected:
  			try:
  				self.serial_connection.close()
  			except c1218.errors.C1218IOError as error:
  				self.logger.error('caught C1218IOError: ' + str(error))
  			except serial.serialutil.SerialException as error:
  				self.logger.error('caught SerialException: ' + str(error))
  			self._serial_connected = False
  			self.logger.warning('the serial interface has been disconnected')
  		return True
docs: Closes the serial connection to the meter and disconnects from the
  		device.