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000295_news@columbia.edu_Sun Nov 4 00:12:55 1995.msg
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From: fdc@columbia.edu (Frank da Cruz)
Newsgroups: comp.protocols.kermit.misc
Subject: Re: Hangup on receive
Date: 3 Nov 1995 19:12:55 -0500
Organization: Columbia University
Lines: 50
Message-Id: <47eb67$nmi@watsun.cc.columbia.edu>
References: <174447818S86.JJSTEP00@ukcc.uky.edu> <47de00$q7a@gateway.dircsa.org.au>
Nntp-Posting-Host: watsun.cc.columbia.edu
Cc:
In article <47de00$q7a@gateway.dircsa.org.au>,
Arthur Marsh <arthur@gateway.dircsa.org.au> wrote:
>Jason Stephenson (JJSTEP00@ukcc.uky.edu) wrote:
>: I just recently got a new machine with a faster (Global Village Teleport
>: Gold II) modem and am now having problems downloading with Kermit. It
>: seems when I try to download a file on my Performa 6116CD at 9600 bps my
>: modem hangs up.
>
>Have you tried getting your modem to ignore DTR (&D0), and consulted with Mac
>modem experts on settings, hardware-handshaking cables and the like?
>
The ckmker.bwr file goes into some detail about this. Quoting:
USING MAC KERMIT WITH MODEMS
The Macintosh serial port is not an RS-232 device and does not support the
full repertoire of modem signals needed for normal operation with modems.
Communication with modems is accomplished using various "fakeouts", each of
which sacrifices some feature in order to accomplish some other feature,
since the Mac has only one modem signal to send to the modem, and reads only
one modem signal from the modem. Thus, for example, the Mac can't hang up
the phone by dropping DTR and use hardware flow control at the same time.
To have the ability to hang up the phone by dropping DTR, you need a regular
Macintosh modem cable that connects the Mac's "Handshake Out" signal
(Mini-Din-8 Pin 1) to the modem's DTR signal (DB25 pin 20), and the modem
should be configured to hang up when DTR goes down. In Mac Kermit, you should
NOT check "DTR input flow control" or "CTS output flow control".
To use hardware flow control with high-speed modems, you need:
1. A special Macintosh hardware-flow-control-modem cable that connects the
modem's CTS signal (DB25 pin 5) to the Macintosh's "Handshake In" signal
(Mini-Din-8 Pin 2) and the Mac's "Handshake Out" signal (Mini-Din-8 Pin 1)
to the modem's RTS signal (DB25 pin 4). This cable *might be* available
from stores or suppliers as a "Macintosh Hardware Handshake Modem Cable"
(buy at your own risk).
2. You MUST configure your modem to ignore DTR ("&D0" on most Hayes and
compatible modems) and to use RTS/CTS flow control. NOTE: This means
you can't hang up the phone by "dropping DTR". Normally, it will hang
up automatically when you log out from the remote computer or service.
If it doesn't, use the escape sequence (such as +++) to get back to the
modem's command processor, and then type the modem command for hanging
up (usually ATH0).
3. In Mac Kermit's Communications Settings menu, uncheck Xon/Xoff flow
control, and check DTR input flow control and CTS output flow control.
- Frank