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9 pin D-SUB male connector layout
9 pin D-SUB male connector
at the UPS
The pinout should fit 1 devices/models. Click to list>
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)
Maximum voltage and current on pins 1,7,8,9 shall be 80 VDC, 10.0 mA max
Pinout status: +2 -0
According to 2 reports in our database (2 positive and 0 negative) the Liebert UPStation-GXT interface pinout should be correct.

Is this pinout
NO DIY devices
Liebert UPStation-GXT interface visual pinout:click to enlarge
Source(s) of this and additional information: UPS FAQ in russian
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