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COMMUNICATION
DB-9 Communication Port
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.
Figure 23 identifies the cable pins and Table 2 describes the pin
functions.
Table 2. Communication Port Pin Assignment
Pin
Number
1
2
3
4
5
6
7
8
9
44
t
Avaya
Line Interactive RM UPS Site Preparation, Installation and Operator's Manual
5
4
3
9
8
Figure 23. Communication Port
Signal Name
Function
Low Batt
Low Battery relay contact; 20 mA, 30 Vdc
contact rating
TxD
Transmit to external device
RxD
Receive from external device
DTR
PnP (Plug and Play) from external device
(tied to Pin 6)
GND
Signal common (tied to chassis)
DSR
To external device (tied to Pin 4)
—
No Connection
AC Fail
AC Fail relay contact; 20 mA, 30 Vdc
contact rating
Power Source
+V (8 to 24 volts DC power)
2
1
7
6
Direction
from the UPS
Out
Out
In
In
—
Out
—
Out
Out
S
164201663 Rev 1
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