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000310_news@newsmaster….columbia.edu _Wed Jul 29 09:38:57 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 13:38:55 GMT
Organization: Columbia University
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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?
: I am running Linux 2.0.34
: (Slackware 3.4). I am trying to use a null modem cable to connect out two
: serial ports together. We are using the 25 pin serial ports. The null modem
: adapter I bought at CompUSA did not work, so my dad took apart the serial
: cable and rewired it to these specs:
:
: PC male DB25 Terminal DB25
: TxD Transmit Data 2 --> 3 RxD Receive Data
: RxD Receive Data 3 <-- 2 TxD Transmit Data
: RTS Request To Send 4 --> 5 CTS Clear To Send
: CTS Clear To Send 5 <-- 4 RTS Request To Send
: DSR Data Set Ready 6
: |
: DCD Carrier Detect 8 <-- 20 DTR Data Terminal Ready
: SG Signal Ground 7 --- 7 SG Signal Ground
: 6 DSR Data Set Ready
: |
: DTR Data Terminal Ready 20 --> 8 DCD Carrier Detect
:
This is about what a commercial null modem cable would do. So if neither
cable works, it is probably not a cable problem.
: The connect still does not work! I have Linux using agetty for the serial
: connection. It ran for half an hour without any errors, but the terminal
: showed nothing on the screen. Is that the right config for a serial PC-PC
: connection? How can I test if the serial ports and cable actually work?
:
: 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
:
: With the serial config shown above shouldn't I have a modem ready status?
:
Has Kermit been started on the 386? Has it been told to SET PORT x, where
x is the appropriate COM port number?
The object is to let the 386 log in to Linux, right? So until this works,
you don't need C-Kermit on Linux for anything. As long as you have a getty
running on the port to which the cable is connected, and the cable indeed
does what you say it does (all pins work), and the serial ports are not
broken, and there are no interrupt conflicts, etc etc, it should work.
You can use "show comm" in MS-DOS Kermit to look at the modem signals.
Or, if you have an external modem handy, try plugging each end of the cable
into it, gender permitting, and see what lights do and don't go on.
- Frank