Install APCSMART UPS on ouhep1/0: Hook it up to COM 0 on ouhep1. Install nut rpms on both ouhep1/0: # rpm -Uvh nut-0.45.0-3.i386.rpm nut-cgi-0.45.0-3.i386.rpm nut-client-0.45.0-3.i386.rpm Documentation in /usr/share/doc/nut-0.45.0/. on ouhep1: on ouhep0: ========= ========= /etc/sysconfig/ups: ----- SERVER=yes SERVER=no MODEL=apcsmart DEVICE=/dev/ttyS0 /etc/ups/upsd.conf: ----- UPS myups /var/lib/ups/apcsmart-ttyS0 apcsmart /dev/ttyS0 ACL all 0.0.0.0/0 ACL localhost 127.0.0.1/32 ACL ouhep0i 192.68.1.4/32 #ACCESS grant monitor localhost ACCESS grant master localhost ACCESS grant login ouhep0i ACCESS deny all all /etc/ups/upsmon.conf: ----- MONITOR localhost 1 master MONITOR ouhep1i 1 slave Then: # chmod o+rw /dev/ttyS0 # /etc/init.d/ups start # /etc/init.d/ups start # /sbin/chkconfig ups on # /sbin/chkconfig ups on To monitor UPS manually: # /usr/bin/upsc[t] localhost # /usr/bin/upsc[t] ouhep1i