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