The standard controls for a dunb UPS are:

power fail:   active low   ups -> computer
battery fail: active low   ups -> computer
shutdown:     active high  computer -> ups

The shutdown command hopefully works only when the UPS is running on
battery otherwise you will (may) have serious setup problems with a
straight cable (peripheral probing during boot can shutdown). Check with a
desk lamp and a PSU (or 4.5V battery + 1k resistor).

You can check the PSU outputs with a DVM set for diode range.

Then make a cable (you may also refer to the Linux UPS-Howto which is way
out of date imho but contains useful clues and doubtful circuits - beware
!).

Peter

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