All UPS units tend to have an alarm (also known as the beeper) that sounds when the power is removed from the unit. This alarm maybe valuable to some people, but I would say for my computer room closet it would be more annoying in the middle of the night than necessary. I'll deal with a power outage when I wake up.
I am running NUT on Gentoo Linux to manage my Tripp Lite OMNI1000LCD UPS (USB) and to turn off the alarm one simply needs to run the following command, remember the username is what you defined in /etc/nut/upsd.users:
#upsrw -s ups.beeper.status=disabled -u nutusername
-p nutpassword theUPS@localhost:3493
immediately following that the command
upsc verified the change was live:
# upsc theUPS@localhost
driver.version.data: TrippLite HID 0.1
ups.mfr: Tripp Lite
ups.model: TRIPP LITE UPS
ups.serial: 692195 B
ups.status: OL CHRG
Now when there is a power loss to the unit it is silent and will shut down the computer when the low battery signal occurs.
keywords: UPS, NUT, alarm off, beeper off, disable alarm, disable beeper, linux, Gentoo, Tripp Lite OMNI1000LCD UPS USB.