Instruction Manual

Page 14
SIGNALS AND INTERFACING
This system is designed to be compatible with most sophisticated operating systems when they
feature a UPS monitoring function. These signals are made available through the DB-9
subminiature female connector at the rear of the UPS. The communications connector at the
rear of the UPR is for a RS232 interface connection. The Signal connector features open-
collector alarm signals. Closing the points between pins 6 and 8 while running on battery will
shutdown the UPS. Below is a diagram of the signal jacks and their pin-outs:
RS232 CONNECTOR
1- LOW BATTERY/
2- TX
3- RX
4- DTR
5- GROUND
6- DSR
7- RTS
8- AC FAIL/
NOTE: Pins 4 and 7 enable relays on the Interface board that allow communications directly with
the UPS from the RS232 Connector. When relays are enabled, SNMP is disabled.
SIGNAL CONNECTOR
2- AC FAIL
3- UPS ON
4- GROUND
5- LOW BATTERY
6- REMOTE SHUTDOWN+
7- REMOTE SHUTDOWN (RETURN)
8- +9VDC