[102366] in RedHat Linux List
Re: Newbie Modem Questions
daemon@ATHENA.MIT.EDU (Jan Carlson)
Wed Dec 2 16:22:18 1998
Date: Wed, 02 Dec 1998 16:15:52 -0500
From: Jan Carlson <janc@iname.com>
To: redhat-list@redhat.com
Resent-From: redhat-list@redhat.com
Reply-To: redhat-list@redhat.com
Marshall Dunlap wrote:
> From: Jan Carlson <janc@iname.com>
>
> Check the man page for setserial, and run setserial to test the modem.
> # man setserial
> If it shows a 16550 uart at com2 irq5 you are on the way.
> After installing the uucp rpm, try talking to the modem on COM2:
> # cu -l /dev/cua1 See if you can send AT and get an OK back.
> Type <return>~. (return tide period) to exit cu. Or try minicom and
> maxicom. I like cu because it needs no setup.
>
> *************I did a setserial on /dev/cua1 and I got:
> UART 16550A, Port: 0x02f8, IRQ: 3
>
> Since I had already installed the uucp rpm, at this point I went ahead and
> did a # cu -l /dev/cua1 What I got back was:
> cu: /dev/cua1: Line in use.
Read more in the setserial man page. You can use setserial
to tell Linux what irq to use for a given port. Try that.
However, none of this is necessary if you set up the
modem to one of the STANDARD configurations in the last
message. You can do that as a second possibility,
and reconfigure any other cards that are in the road.
There is no reason for another card to use up IRQ3 or IRQ4
unless your machine has a LOT of cards installed. Those
IRQs normally belong to serial ports and modems.
>
>
> I don't understand why it says IRQ 3 when I physicaly changed it on the
> card via the jumpers. Well, I DO understand that that is the default IRQ
> for that port but I guess I was hoping that it would probe the card somehow
> and realise that it was suposed to use IRQ 5. Is there a way to change
> this in Linux? Besides that, what does "Line in use" mean exactly?
While it did find the modem on 2f8, it seems to have gotten the
IRQ wrong. That may be why it cannot use the line yet.
However, also try using /dev/ttyS1 instead of /dev/cua1.
Both refer to the same port, but behave a little different.
Also, it could be that something IS USING the port.
Perhaps a ppp setup, diald, minicom or another cu?
>
>
> Thank you for the help. I do feel like I am geting somewhere but my boss
> is NOT happy with my progress. He wants it done yesterday. Is that what
> they teach bosses in boss school? :) Face it: No amount of presure on me
> is going to get it done before it's done.
It is also possible to buy a computer with Linux already installed, for money.
But this way you are learning.
>
>
> Thanks again.
>
> Marshall***********************
--
Jan Carlson
janc@iname.com Scarborough, Ontario, Canada
Mailed with Netscape 4.5 on Red Hat Linux 5.2
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