On 25/09/2006, at 9:55 AM, Michael Chesterton wrote:
James Gray <[EMAIL PROTECTED]> writes:
So I'm trying to see if sending a break to the serial port will reset
the line like my manual cable pulling exercise (after all, unplugging
a serial cable by definition is a "BREAK" right?). So how about it
folks? Anyone know a neat way to send a serial "BREAK" to a serial
device in bash/c/c++/perl (no python on the system I'm working
with).
I've tried:
echo "?BREAK?" > /dev/cua.Serial0 [1]
as root, but no joy. Any pointers gladly accepted :)
chat can send breaks. Don't know how to drive chat, but at a guess
chat '' BREAK </dev/ttyS0
or
chat '' -BREAK- </dev/ttyS0
I think what's really happening is when you unplug the cable, you
lower DTR (not sure if a break does that), so lowering DTR (and I
guess RTS, if it's high) will probably do what you want.
If you have trouble working out how to lower DTR, I can have a go at a
little C program.
The hard-core geek within wants a C/C++ program for this, but then
reality kicks in and if there's something off the shelf that will do
what's necessary I'll go with that :) I can't test any of the
suggestions yet as I need to wait for the unit to go awry and then
start poking around.
Cheers,
James
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