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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
Should work with Windows NT UPS Service
UPS
Signal Name		 DB-9 Male
(UPS end)		 DB-9 Female
(PC end)		 PC
Signal Name
Shutdown 2 4 DTR
PWR Fail 5 8 CTS
LOW BATT 6 1 DCD
Common 1,4 5 GND

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.
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Pinouts.ru > UPS devices pinouts > Pinout of Tripp-lite OmniPro-450 (675) WinNT Cable and layout of 9 pin D-SUB male connector and 9 pin D-SUB female connector
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