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000229_news@columbia.edu _Tue Apr 25 17:36:41 2000.msg
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From: Mark Sapiro <msapiro@value.net>
Subject: Re: MS-DOS null cable
Date: 25 Apr 2000 21:09:37 GMT
Organization: Not Very Much
Message-ID: <8e51ih$prv$1@news.value.net>
To: kermit.misc@columbia.edu
Andr? Cormeau <NOacorSPAM@home.com> wrote:
: Hello,
: I am having no luck with a null modem connection between a WIN98 PC
: running kermit 3.14 in a dos window
: and a 286 laptop running the same kermit under DOS 5.0.
: The cable is supposed to be a full handshaking cable as follows:
: 1 Not Connected
: 2 --> 3
: 3 --> 2
: 4 --> 6
: 5 --> 5
: 6 --> 4
: 7 --> 8
: 8 --> 7
: 9 Not Connected
: Does pin 1&6 need to be connected on each Dsub9 to pin 4?
Pin assignments on a DB-9 serial port are as follows:
1 Carrier Detect
2 Receive Data
3 Transmit Data
4 Data Terminal Ready
5 Signal Ground
6 Data Set (Modem) Ready
7 Request to Send
8 Clear to Send
9 Ring Indicator
Your connections above are good as far as they go. If you want
to use Carrier Detection, it is best to provide the carrier detect
from the other computer's "Data Terminal Ready" signal. Thus,
pin 1 and 6 should be connected together at one end and through
the cable to pin 4 at the other end, and vice versa. I.e, with
your indicated connections, just add a jumper from 1 to 6 on each
DB-9.
: What modem type should I use for a null modem?
: Does anyone have a .scr or .ini file that I could use?
As Joe indicates in another reply, you don't need a modem
script since you aren't dialing or sending any "AT" commands.
--
Mark Sapiro <msapiro@value.net> The highway is for gamblers,
San Francisco Bay Area, California better use your sense - B. Dylan