How about this:

A short adapter cable (DB9M on one end, DB9F on the other, ribbon cable
between. I sever the "low battery" line, and cut in a normally-closed
reed relay, held open by a small "wall wart.") If the UPS fails a
self-test, the "wall wart" is still powered, holds the relay open, and
blocks the low battery warning, but if the power really goes down, the
relay falls closed, and any low battery warning gets through.

-- 
James H. H. Lampert
Professional Dilettante
http://www.hb.quik.com/jamesl
http://members.hostedscripts.com/antispam.html
http://www.thehungersite.com

Help America's Passenger Trains. http://www.saveamtrak.org

Read My Lips: No More Atrocities!


As an Amazon Associate we earn from qualifying purchases.

This thread ...

Replies:

Follow On AppleNews
Return to Archive home page | Return to MIDRANGE.COM home page

This mailing list archive is Copyright 1997-2025 by midrange.com and David Gibbs as a compilation work. Use of the archive is restricted to research of a business or technical nature. Any other uses are prohibited. Full details are available on our policy page. If you have questions about this, please contact [javascript protected email address].

Operating expenses for this site are earned using the Amazon Associate program and Google Adsense.