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000118_fdc@columbia.edu_Thu May 29 09:13:13 EDT 2003.msg
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Article: 14343 of comp.protocols.kermit.misc
Path: newsmaster.cc.columbia.edu!news.columbia.edu!news-not-for-mail
From: fdc@columbia.edu (Frank da Cruz)
Newsgroups: comp.protocols.kermit.misc
Subject: Re: Mac OS X, Break, and Keyspan USB Twin Serial Adaptor
Date: 29 May 2003 09:13:08 -0400
Organization: Columbia University
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In article <ac67ee9b.0305281820.6fd13658@posting.google.com>,
Josh Kuperman <josh@ssimr.com> wrote:
: I downloaded the most recent OS X binary, and followed some
: instructions someone else provided on how to set up permissions for
: the lock file. Everything seemed to be working.
:
: I wanted to see if I could control a Sun Sparc 10 running headless
: from an iMac using Kermit. To get at the serial port on the SS 10 I
: have the following set up [ iMac -> [ Linksys 4-Port Hub] -> USB Twin
: Serial Adaptor -> Old Mac 9 mini din to 25DB modem cable -> null modem
: -> SS10.
:
: I was able to connect as far as I can tell, but I was not able to send
: a Break.
:
The way to send a Break in Kermit is to type Ctrl-\, then b. Is that
what you did?
: I emailed Keyspan and have been scouring the net, but I'm
: wondering if anyone here can offer me insight. I was able to do some
: form of loop back testing by taking an old Mac 9 pin mini-din (both
: ends) printer cable and connecting both ports on the Keyspan USB twin
: serial adaptor.
:
I would not necessarily depend on that. Is a Mac printer cable the same
as a Mac null-modem cable?
: All I established there was I don't seem to get line
: feeds and sending a break seems to disconnect. Anyone have good
: suggestions on loopback testing, connecting through USB ports, or Mac
: OS X perculiarities?
:
Sending Break is one of those crannies of Unix that was never noticed by
standards makers; there are almost as many ways to do it as there are
varieties of Unix.
C-Kermit's Break code for Mac OS X uses the 4.4BSD method, just like
FreeBSD, etc. I don't have hands-on access to Mac OS X so I can't put a
breakout box on it to see if it's really working. Maybe somebody with
physical access can try this. If you don't have a breakout box, use an
external modem that has lights. Ctrl-\ b should make the TxD light
come on for 250 milliseconds (1/4 second). Ctrl-\ l (letter L) should
send a 1.5-second Long Break.
If the Break-sending code in Mac OS X doesn't work, then somebody who
has Mac OS X is invited to fix it. That's why we publish the source
code.
- Frank