UPS – Backup Battery

I have three servers currently, one is a domain controller, one is a macintosh, and the other an xp “FileMaker” Server. I currently have one Back – UPS x5 1500. I’m not sure how to configure the UPS. It was already here when I took the job. I’m not even sure if it’s strong enough to support all three servers. Also, sre you supposed to do more than just plug the power cords into the back, because I see what appears to be data connections also.