ADDITIONAL UPS FEATURES
Avaya
t
S9RM UPS Site Preparation, Installation and Operator’s Manual
S
05147387 Rev C
45
Table 3. 25-Pin Assignment
Pin Number
Signal Name/Relay
Function
7
GND
Signal common
8
Power Source
+V (8 to 24 volts DC power)
14
Normally Open Relay 2
Utility fail
15
Common Relay 2
Utility fail return
18
Common Relay 3
UPS on bypass return
19
Normally Open Relay 3
UPS on bypass
24
Normally Open Relay 4
Battery low
25
Common Relay 4
Battery low return
NOTE No connection on pins 1-6, 9-13, 16, 17, and 20-23.
To establish communication between the UPS and a computer, connect
your computer to the UPS communication port using the supplied
communication cable.
When the communication cable is installed, power management
software can exchange data with the UPS. The software polls the UPS
for detailed information on the status of the power environment. If a
power emergency occurs, the software initiates the saving of all data
and an orderly shutdown of the equipment.