fgets on COM1

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.
";
break;
default :
echo "No se ha podido configurar el COM$numcom.
";
$error_configuracion = true;
}
if (!$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
";
} else {
//voy leyendo el resultado de mi comando
$buffer = fgets($serial_port, 1024);
while (trim($buffer)!="") {
//echo "BUFFER=$buffer
";
$res .= ";$buffer";
$buffer = fgets($serial_port, 1024);
}
//echo "*$res*
";
}
}
}
//---------------------------------------------------------- -----------------------------------------------------
//---------------------------------------------------------- -----------------------------------------------------

thanks

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Re: fgets on COM1

Hello



This won't solve your problem entirely, but you could alter the
max_execution_time (in php.ini) to a lower value so that it times out
quickly when your device is disconnected.



Mark



"(Gemma Montero)" wrote in message
news:42C1115D.7020600@isid.es...
> 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$numcom configurado correctamente.
";
> break;
> default :
> echo "No se ha podido configurar el COM$numcom.
";
> $error_configuracion = true;
> }
> if (!$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
";
> } else {
> //voy leyendo el resultado de mi comando
> $buffer = fgets($serial_port, 1024);
> while (trim($buffer)!="") {
> //echo "BUFFER=$buffer
";
> $res .= ";$buffer";
> $buffer = fgets($serial_port, 1024);
> }
> //echo "*$res*
";
> }
> }
> }
>
//---------------------------------------------------------- ----------------
-------------------------------------
>
//---------------------------------------------------------- ----------------
-------------------------------------
>
> thanks

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