RE: [PHP] More about problems reading COM ports

> -----Original Message----- > From: John McCaskey [mailto:mccaskey@stanford.edu] > Sent: Sunday, March 27, 2005 5:13 AM > Others have reported problems reading COM ports using fopen and fgets or > fread. They open the port and start reading but nothing ever arrives. I had the "problem" and solved it, I believe I posted the answer here too? What kinda device are You listening to? I was listening to a switch and got nothing using the example from the fgetc manual until I restarted the switch, then all the boot info became visual... It reads each byte from the port, so use that as a "listen_wrapper", send try some [enter] commands, have a terminal ready to check if something goes wrong, try output the buffer, when $char is a "\n" and basically know exactly what the device shows and expects. Here´s a hint to get You started: if($fp = fopen('com1', 'wb')) // b for windows // send [enter] fwrite($fp, "\r\n"); // listen to device while (false !== ($char = fgetc($fp))) { echo "$char\n"; $buffer .= $char; if($char == "\n" || $char = "\r") { echo "\nBUFFER: $buffer\n\n"; sleep(3); $buffer = ""; } } } else { echo 'can´t connect to com1, got a terminal open?'; } Play some more with the sleep and [enter] > I have the same problem and discovered the following. There is an 8K > input buffer. Only after 8K bytes have arrived does fgets or fread see the > first. Won´t be a problem with fgetc() since You read char by char. > How does one get around this feature (or bug)? > > This is with php 5.0.2.2 on Windows XP. I´m using 4.3.10 -- Med venlig hilsen / best regards ComX Networks A/S Kim Madsen Systemudvikler/systemdeveloper