public function close()
		{
			if (isset($this->serial))
			{
				dio_close($this->serial);
				unset($this->serial);
			}
			return true;
		}
public function close()
		{
			if (isset($this->serial))
			{
				dio_close($this->serial);
				unset($this->serial);
			}
			return true;
		}
public function close ( ) { if ( isset ( $ this -> serial ) ) { dio_close ( $ this -> serial ) ; unset ( $ this -> serial ) ; } return true ; }
Close connection to serial port
Close connection to serial port