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000194_news@columbia.edu_Mon Aug 21 01:15:15 1995.msg
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1995-12-25
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Path: news.columbia.edu!merhaba.cc.columbia.edu!cf77
From: cf77@columbia.edu (Carrson Fung)
Newsgroups: comp.protocols.kermit.misc
Subject: uart problem
Date: 21 Aug 1995 01:15:15 GMT
Organization: Columbia University
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Message-Id: <418mn3$cbm@apakabar.cc.columbia.edu>
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Apparently-To: kermit.misc@watsun.cc.columbia.edu
Hello,
I was wondering if anyone could help me with a problem using
the serial port on a compaq aero laptop.
I was trying to hook up the computer with a UPS unit in this
fashion:
UPS--signal converter (home-made)--laptop serial port (DB9)
The computer uses a 16550AF UART chip.
We use the UPS s/w to talk to the UPS. The problem is the computer frozed
when I started using the s/w.
My believe is that the converter is sending RS-232C signals
(voltage levels) that might be slightly off the tolerance level
of the UART.
I also noticed when I used kermit (instead of the mfr prog) to
talk to the UPS, I got a msg saying "This port operates through
the BIOS". I didn't get the msg if I am talking to a modem (external).
And if I use the Terminal prog under Windows-Apps, the initialization can
fix the prob, and make subsequent progs (like kermit or the mfr prog)
works as it suppose to. Can someone tell me what sort of initialization
does the Terminal prog use that makes things go right?
I believe it might have something to do with setting the right IRQ,
but I am not sure.
If anyone has a solution, please send me email.
Thanks,
Carrson Fung