<?php

	// declare variables
	$handle 	= $reply = null;
	$filename	= '/dev/ttyUSB1';
	$handle	= fopen($filename, 'r+');

	// validate file handle
        // main code.

		if ( fwrite($handle, 'AT') ) {
			echo 'Command is sent';
			$reply = fread($handle, 4);
			echo $reply;


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

		fclose( $handle );


	die;

?>