> Chuck Dale wrote:
>
> 1) What sort of cable do I need? Null modem?
Aye.
> 2) How do I attach to the serial line? My first clue would be to
> more /dev/ttyS0 and cat commands to it but that seems rather
> clandestine.
minicom has served you well in the past... :)
> 3) How do I set up a getty listening on the serial port?
On which machine? The kernel does the dirty work on the machine you're
talking to, whilst Minicom does the work on the machine you're talking from.
Check the serial howto, and the serial console mini-howto.
> I want it to work both ways so that if either box goes down I can use
> the remaining box to mess with the dead box.
My first guess would be two cables. I doubt there would be a better solution
for a funciton that requires absolute guaranteed connections - I'd love to
be proved wrong though. At first thought, it doesn't sound possible without
a few hacks to the kernel.
> Any ideas on what models provide this feature and
> how it is generally done - by serial connection or SNMP or ?
Jill Rowling answered my question on similar things last week. I was mostly
interested in communication *from* the UPS (via a daemon and scripts), but
it wouldn't surprise me by half if you could control certain UPSes via the
same daemon. I'd wager they'd be the expensive models tho.
- Jeff
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