Serial Port Access via PHP

# Goal
- Access Serial Port on a Linux (Ubuntu 9.4) machine with Php.
- The serial device is an usb serial converter chip "ft232r".
- The Receiver must always be online, because the timepoint of incoming data is unnown.
- The transmitted data has raw format.

# Not Working
- The "php_serial" class works pretty good with the build in serial port, but with the usb serial converter chip there are some errors. Other software doesn't have any problem with the chip. Moreover with directly php acess the "online goal" can't be archieved.

# Ideas - receive
- Serial_sniffer. Didn't get out how to use yet.
- Script below. Problem: Waits for lines, not for every single byte.

# Ideas - transmit
- $ echo "mem" > /dev/ttyS0. Does this works with raw files?
- $ sz fifo >/dev/ttyUSB0 </dev/ttyUSB0 &. Can't file an installation file for ubuntu.

#!/usr/bin/expect
 
proc Reader { pipe } {
global done
 
if {[eof $pipe]} {
catch {close $pipe}
set done 1
return
}
gets $pipe line
set tagxmitdate [clock seconds]
#puts $line $tagxmitdate
puts "$tagxmitdate $line"
}
 
set pipe [open "|cat /dev/ttyS0" r]
fileevent $pipe readable [list Reader $pipe]
vwait done

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