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000301_news@newsmaster….columbia.edu _Thu Nov 20 13:09:48 1997.msg
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From: fdc@watsun.cc.columbia.edu (Frank da Cruz)
Newsgroups: comp.protocols.kermit.misc
Subject: Re: One-way null-modem cable?
Date: 20 Nov 1997 18:09:47 GMT
Organization: Columbia University
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In article <Y3Fd0w8Z727Q092yn@netcom.com>,
Jeffrey Hurwit <jhurwit@netcom.com> wrote:
: Following up on my last question about 16650 UARTs: Ok, so I got the
: null-modem cable (DB25 to DB9) to connect between a desktop and notebook
: (both running Windows 95 OSR2), put each in DOS mode, started MSK314 on
: each, and set the comm parameters so that they could talk to each other
: (at 115200 bps, to start). I put both in terminal (connect) mode, just
: to test the connection-- characters typed on one machine should appear
: on the other's terminal screen, right?
:
: Wrong. Characters typed on the desktop machine appeared on the
: notebook's screen, but not visa versa. A test file transfer showed the
: same results: The notebook received the init packets from the desktop,
: but the desktop didn't receive ACKs/NAKs from the notebook. I tried
: slower speeds, xon/xoff (instead of rts/cts), and half duplex. Nothing
: worked. 'Show comm' always indicated that the RTS, CTS, and CD signals
: were on, on both machines (suggesting that the cable was connected and
: functioning correctly?) I checked the serial ports on each machine with
: Norton diagnostics (part of Norton Utilities for Win 95-- runs in DOS
: mode) as far as I could (I don't have loop-back plugs), and both checked
: out ok.
:
: Suggestions?
:
The most likely explanation is that you don't have TxD and RxD fully
crossed. This kind of thing is always confusing when building a 25-to-9
pin null modem cable. Instead, we recommend you use a regular 25-to-25
pin straight-through modem cable on the one PC, a regular 9-to-25 pin
modem cable on the other, and then connect them with a male-male modem
eliminator.
: Frank and Joe: Thanks again for your continued help and support.
:
Our pleasure.
: jhurwit@netcom.com Jeffrey Hurwit
: "NETCOM: It's not just an ISP, it's a way of life."
:
Kermit too :-)