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000314_news@newsmaster….columbia.edu _Wed Jul 29 19:17:30 1998.msg
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From: fdc@watsun.cc.columbia.edu (Frank da Cruz)
Newsgroups: comp.protocols.kermit.misc
Subject: Re: Serial ports, cables, and terminals
Date: 29 Jul 1998 23:17:28 GMT
Organization: Columbia University
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References: <6pn0jk$7s0$1@nnrp1.dejanews.com> <6pn8lf$1p7$1@apakabar.cc.columbia.edu> <6po2hq$kip$1@nnrp1.dejanews.com>
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In article <6po2hq$kip$1@nnrp1.dejanews.com>, <yahzell@my-dejanews.com> wrote:
: In article <6pn8lf$1p7$1@apakabar.cc.columbia.edu>,
: fdc@watsun.cc.columbia.edu (Frank da Cruz) wrote:
: > In article <6pn0jk$7s0$1@nnrp1.dejanews.com>, <martinja@exis.net> wrote:
: > : I have been trying to set up a terminal for my dad. He is using an old
: > : 386 with a bootdisk running C-Kermit for MSDOS.
: > :
: > You mean MS-DOS Kermit?
:
Yes.
: > Has Kermit been started on the 386? Has it been told to SET PORT x, where
: > x is the appropriate COM port number?
:
: It has been started. I have done set port 1.
:
And Port 1 is the right port?
: > : When I type "show modem" in C-Kermit this is the output:
: > : Modem is not ready: DSR is off
: > : no carrier detect: CD is off (set carrier is off)
: > : no Clear to send: CTS is off
:
So when you type "show modem" in MS-DOS Kermit (not C-Kermit), it does not
see any modem signals coming in. This means:
1. Port 1 is not the right port.
2. Port 1 is the right port, but the Linux port is not sending any modem
signals, which is a Linux configuration problem. I would expect to see
at least CTS and probably also DSR on a port waiting for login.
3. The Linux port is asserting the modem signals, but the cable isn't
conveying them.
4. The cable is bringing the modem signals to the PC port, but the port
is broken.
5. The port is not broken, but the two serial ports are set to different
speeds.
It's easy to pin down problems like this if you have a breakout box, but
without one, it's a matter of trial and error, and/or swapping things.
For example: Can the PC with MS-DOS Kermit successfully communication with
anything other than the Linux system in question? If so, then you can
rule out 1, 3, and 4.
A couple more things to try:
1. Since you're not seeing CTS from the Linux system, tell MS-DOS Kermit
to "set flow none" so it won't be blocked on CTS-Off.
2. Because CD is off, tell MS-DOS Kermit to "set carrier off" so it won't
require CD.
Now you should be able to give a CONNECT command and get the terminal
emulation screen. Press the Enter key. Do you see a prompt (or anything
else legible)? If not, use Alt-B to send a Break signal. Repeat this
process up to 15 times. The Break tells the Linux system to change its
speed and issue a new login: prompt.
- Frank