http://qkpm2ov2rjhjkhfsftskqho77uj5rewd5y44unkf6cb7tdhaxwcvh2id.onion/books/apc/APCUPSD%20User%20Manual.html
If your UPS doesn't appear in the list at all, check the obvious
things: The UPS must be powered on, and a cable must be properly
seated in both the data port of the UPS and one of your machine's
USB ports. Many UPSes have phone ports to provide surge protection
for phones or modems -- make sure you haven't plugged your USB
cable into one of those rather than the data port (which will
usually be near the top edge of the case.)