NYCPHP Meetup

[Corey Fogarty]

Hi again,

I spoke with Keyspan and they assured me the USB to Serial device was
working if I could use the Screen tool.

I asked why I was unable to redirect stdin/stdout to and from the /dev/tty.
device and was told there was no reason I shouldn¹t be able to do so.

I have tried:

    #echo ³A² > /dev/ tty.USA28Xb2P1.1

The terminal window just hangs.

I have also tried #chat and #efax with no luck...

Has anyone had any luck with serial port communication from any other shell
scripting language on a unix/linux box?

Thanks!

Corey




> Subject: [nycphp-talk] Serial communication in Mac OS X
> To: <talk at lists.nyphp.org>
> Message-ID: <C42C2CE7.59796%corey at bmfenterprises.com>
> Content-Type: text/plain; charset="us-ascii"
> 
> Hi All,
> 
> I am trying to connect to /dev/tty.USA28Xb2P1.1 which is a Keyspan USB to
> Serial adapter. I have had success using the screen utility, #screen
> /dev/tty.USA28Xb2P1.1 but I would like to use PHP to create a web interface
> to a microcontroller.
> 
> I have attempted fopen with no luck:
> 
>> > $port = "/dev/tty.USA28Xb2P1.1";
>> > 
>> > $p = fopen($port, 'r+');
>> > $read = fread($p, filesize($port));
>> > fclose($p);
>> > 
>> > echo $read;
>> > 
>> > $p = fopen($port, 'r+');
>> > fwrite($p, "A");
>> > fclose($p);
> 
> I have tried SerProxy but cannot get a connection through telnet. I have
> also tried LibSerial but could only find version 0.5.2 which does not yet
> support PHP apparently... I have read about IOKit but I am not sure it will
> get me where I want to be.
> 
> Any help would be greatly appreciated.
> 
> Thank you!
> 
> Corey


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