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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)
According to 2 reports in our database (2 positive and 0 negative) the Liebert UPStation-GXT interface pinout should be correct.

Is this pinout
Liebert UPStation-GXT interface visual pinout:click to enlarge
Source(s) of this and additional information: UPS FAQ in russian
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