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000304_news@columbia.edu_Tue Jul 11 01:17:15 1995.msg
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From: jrd@cc.usu.edu (Joe Doupnik)
Newsgroups: comp.protocols.kermit.misc
Subject: Re: Tektronics Emulation & Flow Control
Message-Id: <1995Jul11.071715.55790@cc.usu.edu>
Date: 11 Jul 95 07:17:15 MDT
References: <3tsnjv$cdj@sifon.cc.mcgill.ca>
Organization: Utah State University
Lines: 25
Apparently-To: kermit.misc@watsun.cc.columbia.edu
In article <3tsnjv$cdj@sifon.cc.mcgill.ca>, ronis@gibbs.chem.mcgill.ca (David Ronis) writes:
> I use kermit (MS-DOS version 3.14 Patch level 0) to connect to
> our Sun's at work through a 14.4 Sportster Modem. It works
> flawlessly for file transfers, and ascii (VT100, etc.) termial sessions.
>
> However, I have a program that switches kermit to Tektronics emulation
> and then tries to plot a graph. If the graph is small, all works as
> expected, but if the graph is complicated, then what invariably
> happens is that the first part comes out correctly, while the latter
> is all messed up. What appears to happen that part of the input stream
> is lost or corrupted. The line I use is clean, and file transfers
> usually happen with no retries.
>
> Is there something strange in the way kermit handles Xon/Xoff in Tektronics
> mode? Alternately is there something special I should be doing the stty
> on the Unix end?
------------
Flow control in Kermit is independent of Tek mode. It may well be
that your host echos received XON/XOFF flow control bytes and that would
certainly mess up the works. In addition, if you use only end to end
flow control the comms line equipment can drain its buffer capacity without
being blocked, and that's not good. Please use point to point flow control,
and the best of these is RTS/CTS hardware flow control between your PC and
modem. Recall that the remote host must be flow controlled too, somehow.
Joe D.