http://qkpm2ov2rjhjkhfsftskqho77uj5rewd5y44unkf6cb7tdhaxwcvh2id.onion/books/apc/APCUPSD%20User%20Manual.html
Verifying Device Detection and Driver To make sure that your USB subsystem can see the UPS, just do this
from a shell prompt: cat /proc/bus/usb/devices This information is updated by the kernel whenever a device is
plugged in or unplugged, irrespective of whether apcupsd is running
or not.