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5. Communication Port
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) set up
EPO port that allows power to be shut down the protected equipment immediately and does not follow the shutdown
procedure from any power management software.
Note: When EPO switch is reset, the equipment will not return to battery power until the UPS is manually restarted. If
pressing power switch to turn off UPS after EPO is activated, the UPS remains in Standby mode when restarted until
pressing power switch to turn on the UPS again.
Follow the procedure to install the EPO switch as below.
1. Check the UPS is turned off.
2. Remove the EPO connector from the EPO port on the rear panel of UPS
3. Connect isolated, normally-open, dry contacts (rated to handle 60Vdc maximum, 30Vac RMS maximum,
and 20mA maximum) across the EPO device to Pin 1 and Pin 2. Use non-shield wiring, size 18-22 AWG
(0.75 mm
2
– 0.3 mm
2
).
4. Reconnect the EPO connector to the EPO port.
5. Verify that the externally-connected EPO switch is not activated to enable power to the UPS output
receptacles.
6. Plug in the UPS, then pressing power switch button to turn on the UPS.
7. Activate the external EPO switch to test the EPO function(
The EPO signal must remain active for at least
20ms for proper operation)
8. De-activate the external EPO switch and restart the UPS.
