Server Fault is a question and answer site for system and network administrators. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I've got an APC SC1000I which I want to set up to be monitored with NUT, likely with newhidups.
The basic config doesn't work:

# tail -n 1 /var/log/messages
Poll UPS [apc@localhost] failed - Driver not connected

What puzzles me, is that the UPS connected over USB is detected as

# lsusb
Bus 002 Device 004: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port

Is it possible to monitor this given UPS with NUT at all? A working ups.conf section would be welcome.

share|improve this question

I've a SmartUPS 1500 and a BackUPS XS 1500 both plugged into a system and monitored by NUT. The BackUPS uses the usbhid-ups driver; the SmartUPS uses the apcsmart driver. Here's the section of ups.conf that contains both UPSes:

  driver = usbhid-ups
  port = auto
  desc = "BackUPS XS 1500 on rack top"

  driver = apcsmart
  port = /dev/ttyS0
  desc = "SmartUPS 1500 in rack"

You may want to use better names than these, though.

Note that in both cases these require a special cable. Two things to note about the SmartUPS (which APC seems to think your UPS is) - the serial cable is a special cable, and if the UPS was used with a serial cable before, then the USB port is essentially shut off. To reset the selected port, you'll have to perform some magic with the UPS.

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.