Re: Modem not responding in Mulinux v6r4.

From: Michele Andreoli (
Date: Tue Dec 14 1999 - 12:11:31 CET

On Tue, Dec 14, 1999 at 03:28:20AM +0000, nicely wrote:
> > I think there is a mismatch with the START/STOP bits, speed
> > settings or the number of bits setup. How do I set this up
> > in mulinux?

My modem is attached to /dev/ttyS1 (USR 33.6, external). When I
                # setserial -a /dev/ttyS1

it give me:

        Baud_base: 115200, close_delay: 50, divisor: 0
        closing_wait: 3000, closing_wait2: infinte
        Flags: spd_normal skip_test session_lockout

In Linux there is the command "stty" to control serial line, but
can be used only for mouse port, not modem. Serial protocol
handshaking have to be established directly by the com software.

When you use ppp, try to edit by hand the file /etc/ppp/options.
Add and remove in turn the options


This disable hardware flow control.

Also, take care of IRQ conflict ( cat /proc/interrupts) and use
the setserial feature in "setup port".

Check in Windows Control-Panel what IRQ are used for your COM


I'd like to conclude with a positive statement, but I can't 
remember any. Would two negative ones do?       -- Woody Allen
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