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Table 2. Communication Port Pin Assignment
Pin Number Signal Name Function Direction from the
Multi-Port Module
1 Low Batt Low Battery signal 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 after 120 seconds until normal
seconds AC power returns
4 DTR Signal from external device In
5 GND Signal Ground -
6 - Tied to Pin 4 -
7 - No Connection -
8 AC Fail AC Fail signal 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.
6.3 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.
6.4 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.
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