Re: [PLUG] UPS-- probably not the way it's SUPPOSED to work

[bergman@merctech.com]

In the message dated: Wed, 28 Oct 2009 11:53:26 EDT,
The pithy ruminations from jeff on 
<[PLUG] UPS-- probably not the way it's SUPPOSED to work> were:
=> Buoyed and encouraged by all this UPS talk, I installed the software to 
=> monitor my trusty APC mega-ups.
=> 
=> The rear has an amusing jack labeled USB, which is really RJ45 (yeah, I 

RJ45 or RJ11?

Yes, in APC land that really is USB. APC supplies a special USB-to-RJxx cable.

=> know).  I chose serial.  Plugged it into the pc, then into the ups, and

Did you plug in the special (APC-supplied) serial cable? APC UPSs do NOT use 
straight-through or null-modem wiring, which is probably why you caused the 
shutdown.


=> 
=> POOF.
=> 
=> The UPS shut down immediately.
=> 
=> 
=> I believe it's called irony when your battery backup shuts down 
=> completely, to the point where the battery does not come online.  Not 
=> much of a battery backup at this point, no?

Um, I believe it's called "user error", no?

=> 
=> I shall not repeat this experiment.

You can safely repeat it...with the correct cables.

I believe I've got some spare APC cables (we recycled the UPSs long ago, but 
possibly not all the cables) that are available for the asking.

Mark

=> 
=> The only analog I can think of is in audio, getting a ground loop. 
=> Fortunately a ground loop does not shut down the equipment.  [this one 
=> shut down four pc's plus the guy at the next desk leeching off me]
=> 
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