[plug] UPS's with Linux support

[Paul Wilson]

I'm now informed by the writer of the monitoring software for Alpha UPSs
that they beast is actually intelligent, so it *does* talk through Rx, but a
proprietary protocol !

Now it just has to live until the software arrives in 2-3 weeks.

Bugger.

>Not the data line - it won't stay at +12 V, just flickers there when
there's
>data.  Must be a handshaking line (RTS, return on CTS?)

>> From: Paul Wilson
>> Linux has to provide a signal to the UPS (via Tx I think), and if the
>> mains disappears,
>> the UPS switches the signal back to the server (using Rx).  That's it !


Paul