http://qkpm2ov2rjhjkhfsftskqho77uj5rewd5y44unkf6cb7tdhaxwcvh2id.onion/books/apc/APCUPSD%20User%20Manual.html
If you have an
APC-made UPS, whether sold under the APC nameplate or OEMed (for example, the HP
PowerTrust 2997A), and you want you get it working with a computer running
Linux, Unix, or Windows, you are reading the right document. This manual is divided into parts which increase in technical depth
as they go. If you have just bought a state-of-the-art smart UPS
with a USB or Ethernet interface, and you are running a current
version of Red Hat or SUSE Linux, then apcupsd is
very nearly...