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5.4 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 environ-
ment. If a power emergency occurs, the software initiates the saving of all data and an orderly
shutdown of the equipment.
The pin functions are described in Table 1.
Table 2. Communication Port Pin Assignment
Pin Number Signal Name Function Direction from the
Multi-Port Module
1 Low Batt Low Battery relay contact Out
2 RxD Transmit to external device Out
3 TxD Receive from external device In
RS-232 low Conditional Power Off: In absence In
level signal of AC power, output is turned off
for>0.4 until normal AC power returns
seconds
4 - No Connection -
5 GND Signal Ground -
6 - No Connection -
7 - No Connection -
8 AC Fail AC Fail relay contact Out
9 Power Source +V (8 to 24 volts DC power) Out
USB Port
The UPS is also equipped with a USB communication port. Either the DB-9 communication port or
the USB port may be used to monitor the UPS; however, they cannot operate simultaneously.
Refer to the power management software instructions for using the USB port.
5.5 Communication Slot
The Powerware 9120 UPS has a communication slot that allows quick installation of the optional
SNMP/Web adapter or future communication interfaces. These interface adapters extend the
capabilities of the Powerware 9120 system to provide compatibility with network and remote moni-
toring/management systems.
5.6 SNMP/Web Adapter
This adapter provides the Powerware 9120 system with its own ethernet network connection,
allowing it to be remotely monitored and controlled via industry-standard internet browsers. The
HTML interface enables UPS monitoring and management from anywhere on the internet or with-
in your intranet. In addition, third-party Simple Network Management Protocol (SNMP) software
packages may also be used to communicate remotely with the Powerware 9120 system.