code: def _init(self):
          
          self._ready = self._file.read(1)
          self._hall_left = self._file.read(2)
          self._hall_right = self._file.read(2)
          self._carriage_type = self._file.read(1)[0]
          self._carriage_position = self._file.read(1)[0]
docs: Read the success byte.