Path: utzoo!utgpu!water!watmath!clyde!bellcore!rutgers!gatech!bloom-beacon!tut.cis.ohio-state.edu!mailrus!uwmcsd1!ig!agate!ucbvax!ucsd!ucsdhub!ucrmath!jantypas
From: jantypas@ucrmath.UUCP (John Antypas)
Newsgroups: comp.unix.questions
Subject: Talking to serial devices on Sys V?
Message-ID: <349@ucrmath.UUCP>
Date: 11 Jul 88 15:58:01 GMT
Reply-To: jantypas@ucrmath.UUCP (John Antypas)
Organization: University of California at Riverside
Lines: 12

Hello again.

Does anyone out there in Sys V know what the correct procedure for 
openning a two-way connection to a serial device is?  I want to be to
send ascii strings to a few devices and read results back, but every 
time I fiddle with all of the various stty type values, I get various
results -- all wrong.

How can one for example, write a C program which will open a 2400 baud
connection to a modem on /dev/tty0, send the string "AT<return>" and
then attempt to read the "OK" from the modem?  Sounds trivial, but it hasn't
been for me!