UPS devices  > Tripp-lite pinouts
Part# 73-0724 (BC, Internet Office, OmniSmart UPS). Should work with PowerAlert software.
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 male connector layout
9 pin D-SUB male connector
at the UPS
9 pin D-SUB female connector layout
9 pin D-SUB female connector
at the computer
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Tripp-lite OmniPro-450 (675) PowerAlert Cable visual pinout:
Tripp-lite OmniPro-450 (675) PowerAlert Cable diagram
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