Here's a quick post showing how to configure and setup an Eaton Ellipse ASR 1500 UPS with CentOS 5 using NUT in about 5 minutes flat!
Firstly install NUT. To do that we'll need to install Fedora EPEL.
# rpm -Uvh http://download.fedora.redhat.com/pub/epel/5/i386/epel-release-5-3.noarch.rpm
Then we install NUT.
# yum install nut
# chkconfig ups on
Add the following to /etc/ups/ups.conf.
[eaton]
driver = usbhid-ups
port = auto
desc = "Eaton Ellipse ASR 1500"
Add a UPS user to /etc/ups/upsd.users. Please change your password to something sensible.
[upsmon]
password ...
— Andrew