The HP R1500 XR UPS is currently not compatible with ReadyNAS. The issue is the HP R1500 XR send a message announcing to be an "HP/Compaq AF401A". The ReadyNAS will interpret the announcement and try to manage an "AF401A". The communication path is never established between ReadyNAS and the UPS.
HP R1500 XR Part Number: 204404-B31 Protocol: XCP Version: 3.04
