UPS Manual (Deltec PRM450a) Needed

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I was given a Deltec PRM450a UPS and serial cable but no manual or other
documentation.  The box is working fine but I would like to know more about
the indicator lights and other stuff.

If you know where I can download an electronic copy of the manual it would
be appreciated.

I've tried a few web searches but everything I can find says the company was
bought out one or two times by now and the latest company does not support
the old product line.

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