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9 pin D-SUB male connector layout
9 pin D-SUB male connector
Pin#
 
Function
 
1
Low Battery (Optocoupler Collector: +V)
 
2
UPS TxD
 
3
UPS RxD
 
4
Remote ShutDown (+5..12VDC, 10 mA max); on battery operation
 
5
Common
 
6
Remote ShutDown (Short to pin 5); any mode operation
 
7
Low Batery (Optocoupler Emitter: -V)
 
8
Utility/Mains Fail (Optocoupler Emitter: -V)
 
9
Utility/Mains Fail (Optocoupler Collector: +V)
На распиновку Liebert UPStation-GXT interface есть 2 отзыв(а): 2 положительных и 0 отрицательных.

Эта распиновка
Источник(и) этой и дополнительной информации: UPS FAQ in russian
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