Path: utzoo!attcan!uunet!lll-winken!lll-tis!helios.ee.lbl.gov!pasteur!ucbvax!decwrl!decvax!ima!cfisun!lakart!dg
From: dg@lakart.UUCP (David Goodenough)
Newsgroups: comp.dcom.modems
Subject: Re: Break definition
Message-ID: <248@lakart.UUCP>
Date: 15 Sep 88 23:02:57 GMT
References: <402@ucrmath.UUCP>
Organization: Lake - The systems people
Lines: 34

From article <402@ucrmath.UUCP>, by jantypas@ucrmath.UUCP (John Antypas):
> I purchased a California Communications Corp. 2400 baud internal modem.
> Overall, it works just fine under Unix, but I have yet to be able to
> send a "break tone".  The problem appears to be that CCC didn't know how
> to handle a break.  They claim the modem has a litteral serial port
> on it so there should be no problems but...
> 
> CCC is willing to correct the problem but they need to know how to handle
> the break.  After all, there is no such thing as a break character.  What
> must they do to send a break and what do they do when a "break" is received?
> How do external modems do this?
> 
> Many thanks.

I read this with a great deal of concern. I run a 1200 BPS modem, which
is (in efferct) a bit transmitter: I throw a stream of bits into it,
and they come out the far end. I know this to be the case, because on
one occasion the getty here at lakart got stuck at 300 BPS, but with
modems swapping 1200 BPS carrier. So I just dropped my terminal speed
to 300, logged in, did a stty 1200, and re adjusted my local speed, and
all was well.

Reading between the lines of the above posting it would seem that 2400
BPS modems are character transmitters, which means they are going to
break a lot of things for me. For example I call in 7e1 to talk text
with lakart, but if I'm going to do an Xmodem transfer, I have to set
my end to 8n2 to get it to go. Now if the modem is hooked on the notion
of 7e1, I'm in real trouble. How are other people getting around this,
or is it not a real problem, and I don't have a clue what I'm talking
about.
-- 
	dg@lakart.UUCP - David Goodenough		+---+
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