I have a very recalcitrant modem directly connected to the serial
port of an Indigo r4k (running 4.0.5F).
Sometimes (far too regularly :-() the comms application that we are
using over this line completes, but the modem then ends up in a strange
state and the modem lines aren't set correctly to allow another
Specifically, even if I power on/off the modem, unplug/plug the
serial cable, sometimes DTR never gets reasserted even when there is
a getty running on the port (/dev/ttyf2). This means the modem just
never answers an incoming call and just rings, rings, rings .....
The only way I've found to date to clear the problem is to turn the
machine off and power up again -- something I certainly am loath to
do every time.
So ..... can the individual lines of the serial port be controlled??
I'd like to have a small application such that if I detect that my modem
has screwed up yet again, I can simply toggle the input lines to some
/\/\ : Ian Hoyle, Senior Research Scientist
/ / /\ : Image Analysis Group
/ / / \ : BHP Research
/ / / /\ \ : 245 Wellington Rd, Mulgrave, 3170, AUSTRALIA
\ \/ / / / : Phone +61-3-560-7066
"If the idea of a protocol behaving like a rabid, diseased sex-crased
bunny rabbit appeals to you, AppleTalk is for you."
-- John Kennedy, comp.dcom.sys.cisco