Not finished, work in progress …

apt-get install nut nut-cgi

cp -a /usr/share/doc/nut/examples/ups.conf /etc/nut
cp -a /usr/share/doc/nut/examples/upsd.conf /etc/nut
chown nut:nut /dev/ttyS0

vim ups.conf

[power]
  driver = powercom
  port = /dev/ttyS0
  desc = "Powercom UPS System"

cp -a /usr/share/doc/nut-cgi/examples/* /usr/share/nut
cd /var/www
ln -s /usr/share/nut ups

access the web interface at http://localhost/ups/upsstats.html