fgets on COM1

[gmontero@xxxxxxx (Gemma Montero)]

I'm trying to do a script which write and read to/from COM1.
All works fine when something is connected on COM1, but when I 
disconnect the rs232 cable or it fails, the script try to do fgets and 
never stop.
set_mode command works, write command works, but fgets don't say that 
nothing is connected, and the script continue trying to read from COM1.
I have to kill the php task to liberate COM1

How can I solve this problem?

Code:
//---------------------------------------------------------------------------------------------------------------
//---------------------------------------------------------------------------------------------------------------
//configuro el puerto
$set_mode = "MODE COM$numcom: BAUD=38400 PARITY=N DATA=8 STOP=1 TO=OFF 
XON=OFF ODSR=OFF OCTS=OFF DTR=OFF RTS=OFF IDSR=OFF";
exec($set_mode, $output, $result);
      
#compruebo el resultado del exec comando mode
switch ($result) {
     case 0:
              echo "COM$numcom configurado correctamente.<br>";
               break;
     default :
              echo "No se ha podido configurar el COM$numcom.<br>";
               $error_configuracion = true;
}
if (!$error_configuracion) {
      //abro el puerto
     $serial_port = fopen("COM$numcom", "wb+");

   if (isset($serial_port)) {
       //si ha podido abrir la conexion ejecuto comandos y leo sus 
respuestas
      
       $comando = "MICOMANDO";
         //Ejecuto el comando
       $result = fwrite($serial_port, "* $comando\r\n");
       //echo $result;
       if (!$result) {
            //no puede escribir
            echo "Error escribiendo en COM$numcom <br>";
      } else {
         //voy leyendo el resultado de mi comando
          $buffer = fgets($serial_port, 1024);
           while (trim($buffer)!="") {
               //echo "BUFFER=$buffer<br>";
              $res .= ";$buffer";
               $buffer = fgets($serial_port, 1024);
           }
           //echo "*$res*<br>";
     }  
   }
}
//---------------------------------------------------------------------------------------------------------------
//---------------------------------------------------------------------------------------------------------------

thanks

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