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5.1 RS-232 and USB Communication Ports
To establish communication between the UPS and a computer, connect your computer to one of the UPS communication
ports using an appropriate 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.
The cable pins for the RS-232 communication port are identified as below, and the pin functions are described in Table 6.
Table 6. DB9 Female (RS232 +dry contact)
PIN #
Description
I/O
Function Explanation
1
BATLOW
Output
Battery low
2
RXD
input
RXD
3
TXD
Output
TXD
4
DTR
Input
N/A
5
Common
--
Common (tied to chassis)
6
DTR
Input
N/A
7
RING
Output
Ring
8
LNFAIL1
Output
Line fail
9
Vcc
-----
N/A
RS232 Communication Port
5.2 Emergency Power Off (EPO)
EPO is used to shut down the load from a distance. This feature can be used for shutting down the load on Emergency.
Warning:
This circuit must be separated from hazardous voltage circuits by reinforced insulation.
Caution:
The EPO must not be connected to any utility connected circuits. Reinforced insulation to the utility is required. The EPO
Switch must have a minimum rating of 24Vdc and 20mA and be a dedicated latching-type switch not tied into any other circuit.
The EPO signal must remain active for at least 20ms for proper operation
EPO Connections
Wire Function Terminal Wire Size Rating Suggested Wire Size
EPO 4-0.32mm
2
(12-22AWG) 0.82mm
2
(18AWG)
Note:
Leave the EPO connector installed in the EPO port on the UPS even if the EPO function is not needed.