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9 pin D-SUB male connector layout
9 pin D-SUB male connector
Part# 73-0724 (BC, Internet Office, OmniSmart UPS). Should work with PowerAlert software.
Signal Name
DB-9 Male
(UPS end)
DB-9 Female
(PC end)
Signal Name
Ground 1 3  
AC Fail 5 8 CTS
Inverter shutoff- 4 5 GND
Inverter shutoff+ 2 7 this wire includes one 1N4148 or 1N4149 diode |<

Two 10 k resistors present DB9F 8-4, 4-1. Pin 4 at the PC end (DTR) connected by R1 10kOhm to pin 8 (CTS) and by R2 10kOhm to pin 1(DCD)

PC End

1 - Black

3 - Brown

5 - Orange

7 - Red

8 - Yellow

Cover - Bare Metal

9 pin D-SUB female connector layout
9 pin D-SUB female connector
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