[Serial port connection works only after connecting with hyperterminal or putty]

Hello btherl!

 

Do you think the script bellow is correct? I'm trying to execute it, and still PHP is hanging forever.

 

error_reporting(E_ALL);

$descriptorspec = array(
   0 => array("pipe", "r"),  // stdin is a pipe that the child will read from
   1 => array("pipe", "w"),  // stdout is a pipe that the child will write to
   2 => array("file", "error-output.txt", "a") // stderr is a file to write to
);

$cwd = NULL;
$env = array('some_option' => 'aeiou');

$process = proc_open('c:/fontes/web/sisbalance/lib/plink -serial COM6', $descriptorspec, $pipes, $cwd, $env);

if (is_resource($process)) 
{    
    fclose($pipes[0]);

    echo stream_get_contents($pipes[1]);
    fclose($pipes[1]);
    
    $return_value = proc_close($process);

    echo "command returned $return_value\n";
}

[Serial port connection works only after connecting with hyperterminal or putty]

btherl, thank you for replying.

 

Using your idea, I executed the following script:

 

error_reporting(E_ALL);

$command = exec('c:\fontes\web\sisbalance\lib\plink -serial COM6 -sercfg 4800,7,n,1,n');

 

With that, PHP hangs forever, just like the other script, because he waits for serial response. So I tried to send the output to a txt file, like this:

 

error_reporting(E_ALL);

$command = exec('c:\fontes\web\sisbalance\lib\plink -serial COM6 -sercfg 4800,7,n,1,n >> c:\fontes\web\sisbalance\lib\log.txt 2>&1 &'); 

 

PHP still hangs forever. However, the serial port data is sent correctly to log.txt.

 

My question is: Is there a way to execute the script using plink.exe without hanging forever?

 

Thanks in advance!

[Serial port connection works only after connecting with hyperterminal or putty]

Hello everybody.

 

I have a script that connects with a weight scale serial port, reads the data and prints the result.

Here it is:

error_reporting(E_ALL); 

exec('mode COM6: baud=4800 data=7 stop=1 parity=n xon=on'); 
$fd = dio_open('COM6:', O_RDWR); 

if(!$fd) 
{ 
    echo "Error!"; 
} 
else 
{ 
    sleep(5); 
     
    $buffer = dio_read($fd); 
     
    if ($buffer) 
    { 
        echo $buffer; 
    } 
}  

 

The script should print the buffer when the weight scale print some result. However PHP keeps waiting forever. No error. BUT, if I start a connection with COM6 using Hyperterminal or PUTTY before I run the script, it works perfectly.

 

Any ideas? I'm using Windows, Apache 2.2 and PHP 5.3

 

Thank you and sorry for my english.