Part# 73-0724 (BC, Internet Office, OmniSmart UPS). Should work with PowerAlert software.
9 pin D-SUB male connector to the UPS
Pin 4 at the PC end (DTR) connected by R1 10kOhm to pin 8 (CTS) and by R2 10kOhm to pin 1(DCD)
9 pin D-SUB female connector to the computer