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9 pin D-SUB male connector layout
9 pin D-SUB male connector
Should work with Windows NT UPS Service
Signal Name
DB-9 Male
(UPS end)
DB-9 Female
(PC end)
Signal Name
Shutdown 2 4 DTR
PWR Fail 5 8 CTS
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)

9 pin D-SUB female connector layout
9 pin D-SUB female connector
According to 1 reports in our database (1 positive and 0 negative) the Tripp-lite OmniPro-450 (675) WinNT Cable pinout should be correct.

Is this pinout
Tripp-lite OmniPro-450 (675) WinNT Cable visual pinout:click to enlarge
Source(s) of this and additional information: UPS FAQ in russian
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