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000131_fdc@watsun.cc.columbia.edu_Fri May 11 17:02:28 EDT 2001.msg
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Article: 12422 of comp.protocols.kermit.misc
Path: newsmaster.cc.columbia.edu!watsun.cc.columbia.edu!fdc
From: fdc@watsun.cc.columbia.edu (Frank da Cruz)
Newsgroups: comp.protocols.kermit.misc
Subject: Re: kermit can send, but does not display incoming characters
Date: 11 May 2001 21:02:19 GMT
Organization: Columbia University
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In article <3AFC4DC3.A85668E7@bivio.net>,
Martin Lichtin <lichtin@bivio.net> wrote:
: I have two PCs connected with a null-modem cable.
:
: On one PC, there's a getty process running, kermit on the other PC.
: When I attach to the getty process (strace on Linux), I can
: see how the proper characters are received from kermit and
: also how it echoes the characters back over the line. So the cable
: seems to be setup properly, the baud rate, etc match.
:
: However, kermit does not display the characters coming in from the
: getty side! Any ideas what the problem could be? The only setting I
: have on the kermit side is "set carrier-watch off".
:
: This is C-Kermit-7.0.197-7 under RH7.1.
:
The fact that strace shows characters being echoed does not necessarily
prove they are going out the port. A few suggestions:
. How do you know the getty PC's transmit speed is the same as
the Kermit PC's receive speed? Use Kermit's SET SPEED command
to select the right speed. If you don't know, try different ones.
If that doesn't help:
. Make sure the cable is OK. Maybe the wire that goes from the
getty PC's TxD to the Kermit PC's RxD is broken (or miswired).
If the cable is OK and the speed isn't the problem:
. Tell Kermit to "show comm". If it does not say that DSR and CTS
are both ON, maybe your Linux device driver is refusing to read
characters from the port.
. Finally, ability to send characters but not receive them on a PC is
a classic symptom of an interrupt conflict.
- Frank