Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!rutgers!tut.cis.ohio-state.edu!ucbvax!pasteur!ames!amdahl!pacbell!att!chinet!les
From: les@chinet.chi.il.us (Leslie Mikesell)
Newsgroups: comp.dcom.modems
Subject: Re: xyzmodem problems
Message-ID: <8500@chinet.chi.il.us>
Date: 20 May 89 04:04:00 GMT
References: <24404@agate.BERKELEY.EDU> <8457@chinet.chi.il.us> <24440@agate.BERKELEY.EDU> <206@bilver.UUCP>
Reply-To: les@chinet.chi.il.us (Leslie Mikesell)
Distribution: usa
Organization: Chinet - Public Access Unix
Lines: 19

In article <206@bilver.UUCP> bill@bilver.UUCP (Bill Vermillion) writes:

>Something doesn't sound right here, to me at least.  17 (decimal) is a control
>Q which is a restart after xoff.  Control S is decimal 19.  The way I see it,
>either kermit doesn't use the lower numbers, and sends a 19 for 17 - that
>doesn't seem at all logical, or something else is coming in to play.

Right, it is control Q but that is generally not passed through links
that process xon/xoff flow control.  As another posting mentioned it
could also be 16 or control P which is sometimes used as Data Link Escape
in packet networks.
Kermit forces everything into the printable character range by preceding
control characters with a prefix character and making the character itself
into the printable representation.  For example, control-M is sent as #M
which is somewhat inefficient but it often works where other methods fail. 
Most kermits allow similar quoting to done (or not) for characters with the
high bit set according to the needs of the transmission medium.

Les Mikesell