COMMUNICATION
Eaton 5115 Rack-Mount UPS (500–1500 VA) User's Guide S 164201449 Rev B www.eaton.com/powerquality
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
245
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
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