PROBLEMA errore serial class php

[joker320t]

Ciao a tutti ragazzi sto cercando di far comunicare in seriale php e arduino ho scrtto tutto lo script ma la classe seriale di php mi da questi errori potreste darmi una mano??

<?
phpinclude "php_serial.class.php";
error_reporting(E_ALL);ini_set("display_errors", 1);
$serial = new phpSerial;
$serial -> deviceSet("/dev/ttyACM0");
$serial -> confBaudRate(9600);
$serial -> confParity("none");
$serial -> confCharacterLength(8);
$serial -> confStopBits(1);
$serial -> confFlowControl("none");
$serial -> deviceOpen();

if (isset($_GET['action'])) {        
    if ($_GET['action'] == "on") {            
        $serial->sendMessage("h");
    } else if ($_GET['action'] == "off") {
            $serial->sendMessage("l");        }
        $serial->deviceClose();}?>

Questi sono gli errori invece

Warning: Specified serial port is not valid in /var/www/html/php_serial.class.php on line 145

Warning: Unable to set the baud rate : the device is either not set or opened in /var/www/html/php_serial.class.php on line 238

Warning: Unable to set parity : the device is either not set or opened in /var/www/html/php_serial.class.php on line 292

Warning: Unable to set length of a character : the device is either not set or opened in /var/www/html/php_serial.class.php on line 340

Warning: Unable to set the length of a stop bit : the device is either not set or opened in /var/www/html/php_serial.class.php on line 381

Warning: Unable to set flow control mode : the device is either not set or opened in /var/www/html/php_serial.class.php on line 426

Warning: The device must be set before to be open in /var/www/html/php_serial.class.php on line 171


Grazi mille in anticipo ragazzi :DD