Should work with Windows NT UPS Service
9 pin D-SUB male connector to the UPS
Pin 7 at the PC end (RTS) connected by R1 2k0 to pin 8 (CTS) and connected by R2 2k0 to pin 1(DCD)
Power_Failure - Negative, Low_Battery - Negative, UPS_Shutdown - Positive.
9 pin D-SUB female connector to the computer