public function read($length = self::DEFAULT_LENGTH)
		{
			$bytes = dio_read($this->serial, $length);
			return $bytes;
		}
public function read($length = self::DEFAULT_LENGTH)
		{
			$bytes = dio_read($this->serial, $length);
			return $bytes;
		}
public function read ( $ length = self :: DEFAULT_LENGTH ) { $ bytes = dio_read ( $ this -> serial , $ length ) ; return $ bytes ; }
Read data from serial port
Read data from serial port