<?php
 if (!extension_loaded("dio")) print "skip";

	// declare variables
	$handle 	= $reply = null;
	$filename	= '/dev/ttyUSB1';
	$handle	= dio_open($filename, O_RDWR | O_NOCTTY | O_NONBLOCK);

	//validate file handle
	if ( !is_file($handle) ){

		echo 'The device isn\'t detected';

	}else{ // main code.
               dio_fcntl($handle, F_SETFL, O_SYNC);

   dio_tcsetattr($handle, array(
  'baud' => 9600,
  'bits' => 7,
  'stop'  => 1,
  'parity' => 0));

		if ( dio_write($handle, 'AT') ) {
			echo 'Command is sent';
			$reply = dio_read($handle, 10);
			//echo $reply;


		}else{
			echo 'The device isn\'t read';
		}

		dio_close( $handle );
	}

	die;

?>