Tripp-lite OmniPro-450 (675) PowerAlert Cable

9 pin D-SUB male connector to the UPS

UPS Signal Name	DB-9 Male (UPS end)	DB-9 Female (PC end)	PC Signal Name
Ground	1	3
AC Fail	5	8	CTS
LOW BATT	6	1	DCD
Inverter shutoff-	4	5	GND
Inverter shutoff+	2	7	this wire includes one 1N4148 or 1N4149 diode \|<

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