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From: vax@sylvester.cc.utexas.edu (Vax)
Newsgroups: comp.os.386bsd.questions,comp.os.386bsd.development
Subject: Re: Regarding Cables on com [NetBSD-0.9]
Date: 26 Sep 1993 14:16:18 -0500
Organization: The University of Texas - Austin
Lines: 46
Message-ID: <284pq2$kld@sylvester.cc.utexas.edu>
References: <283pb6$ier@sylvester.cc.utexas.edu> <1993Sep26.170855.27095@gmd.de>
NNTP-Posting-Host: sylvester.cc.utexas.edu
In article <1993Sep26.170855.27095@gmd.de>,
Holger Veit <veit@borneo.gmd.de> wrote:
>This is a correct 9-to-25 cable (at least from the numbering, look at
>the connectors itself; they should have numbers printed on the soldering
>side)
The numbers on one of the sides (the female) were printed on the outside.
I assumed the other side was numbered opposite, so they'd match up when
mated. I really doubt it'd work at all if my cable had left-right
reversed.
>Fortunately you didn't want to have a "correct Null-Modem cable"
>which is one of the most controversal items in the interfacing world.
Yes, that would be a problem, especially when connecting to a modem :-)
>CTS-off signals to the computer that the input buffer of the modem is
Yes, I am aware of this. I have read enough on RS-232 interfacing to
understand what is going on.
>Since I have seen RTS/CTS flow control working on
>my system with TE/2 or Telix (and 386bsd-pk0.2.4, com driver), it might
>be bad hardware or - which is possible as well - a wrong or missing
>jumper.
Well, as usual, "it works fine under DOS".. in telemate, I have RTS/CTS
enabled and I get trasfer rates of 1500cps or more. I'll check to see
if CTS ever goes down during DOS downloads.
>My 4-serial line board has many, of course undocumented, jumpers,
>labeled DSR/DTR/CTS/RTS/DCD which seem to open the corresponding
>line from the RS232 driver to the connector. This should make sense for
>connecting a terminal TXD/RXD/GROUND only, but can cause certainly
>interesting effects with a modem.
No doubt! I plan on calling the board maker's BBS and asking about the
problem.
>This may be an overrun effect on the modem.
I am sure it is :-)
>This is certainly not normal. But the message from VM system I sometimes
>get with slip ("VM object something ... not clean", 386bsd & FreeBSD,
>I've seen this reported with emacs some time ago) isn't kosher as well.
Yes. But then again, crashing every time someone tries to FTP something
is no fun. Of course, rcp works just fine, probably due to its lower
bps rate.
--
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