code: def get_pin_width(self):
          
          command = const.CMD_GET_PINWIDTH
          command_string = b' P'
          response_size = 9
          cmd_response = self.__send_command(command, command_string, response_size)
          if cmd_response.get('status'):
              width = self.__data.split(b'\x00')[0]
              return bytearray(width)[0]
          else:
              raise ZKErrorResponse("can0t get pin width")
docs: :return: the PIN width