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9 pin D-SUB male connector layout
Разъем 9 pin D-SUB male

For models manufactured before 2003

UPS
Signal Name
DB-9 Male
(UPS end)
DB-9 Female
(PC end)
PC
Signal Name
Direction
RxD 1 2    
AC Fail 2 9 Power Fail-normally open status, will become closed during active OUTPUT
n/a 3 1 not used  
GND 4 5 Reference GND for pin2,5   OUTPUT
Bat Low 5 6 Battery Low- normally open status, will become closed during
active
OUTPUT
TxD 6 3 Remote shutdown UPS-keep this pin at high voltage(+5V~+12V)
500ms to shutdown UPS. Activates at battery mode
INPUT
GND 7 8 Reference GND for pin6  INPUT
RTS 8 7    
DTR 9 4    

AC Fail and Bat Low - normally open (shorted to GND when active).

For models manufactured after 2003 (some pre-2003 models also use this cable)

UPS
Signal Name
DB-9 Male
(UPS end)
DB-9 Female
(PC end)
PC
Signal Name
Direction
n/a 1 -    
TxD 2 2,9 RxD, RI OUTPUT
RxD 3 3 TxD INPUT
+12V 4 4 DTR (internally used as source for logical 0 of pin 2) INPUT
GND 5 5 GND OUTPUT
AC Fail 6 -   OUTPUT
-12V 7 7 RTS (internally used as source for logical 1 of pin 2) INPUT
Bat Low 8 -   OUTPUT
n/a 9 -    

Note: pins 4 and 7 are used as voltage sources for pin 2 so they should be driven to 0 and 1 accordingly.

9 pin D-SUB female connector layout
Разъем 9 pin D-SUB female
На распиновку PowerCom King UPS cable есть 4 отзыв(а): 3 положительных и 0 отрицательных.

Эта распиновка
Источник(и) этой и дополнительной информации: UPS FAQ in russian, http://pcm.ru/support/docs/
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