help reading data from a serial port

skydemon · 08-08-2006, 09:12 PM

Hi all, I am a bit of a newbie to this but I'm trying to write a shell script that will get a modem to dial out via a serial port and then wait for a CONNECT string to be returned. I can get it to dial out ok using:

echo -e "ATDTXXXXXXX\r" > /dev/ser1

however I am not sure how I can read data from the serial port to make sure the modem is connected. I cant use a chat script to do this for me unfortunately as I am using a cut down version of *nix and it does not have this installed. Can anyone help out?

Cheers

Mick

blackhole54 · 08-10-2006, 08:48 AM

I don't know what /dev/ser1 is (unless it's a symlink), but if you know what you are talking about, OK.

You can see what comes back (if you have privilege to read /dev/ser1) with

cat /dev/ser1 ,

which can be subjected to the usual tricks such as redirecting, piping, etc.

Before doing any echos or cats, you probably want to set the I/O options with

stty [options] -F /dev/ser1

Consult the stty man page for details.

Good luck.