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1a
1b
1c
Your model may differ.
Your model may differ.
25
Optional Connections
Your UPS will function properly without these connections.
1
USB and RS-232 Dry Contact Communications
Use the included USB cable (see figure
1a
) and/or RS-232
serial cable (see figure
1b
) to connect the communication port
of your computer to the communication port of your UPS. Install
on your computer the Tripp Lite PowerAlert Software appropriate
to your computer's operating system. Consult your PowerAlert
manual for more information.
1c
RS-232 dry contact communications are simple, but some
knowledge of electronics is necessary to configure them. The
RS-232 port’s pin assignments are shown in the diagram. If the
UPS battery is low, the UPS sends a signal by bridging pins 8
and 5. If utility power fails, the UPS sends a signal by bridging
pins 1 and 5. To shut the UPS down remotely, short pin 3 to pin
9 for at least 4 seconds. Additional functions of these pins can
be configured through the LCD or via Web management
accessory card communication.
PIN
Assignment Description
RS-232 Dry Contact
1 Utility Fail (Open Collector)
2 UPS TxD
3 UPS RxD Remote Shutdown (5-12V)
4 Reserved Reserved
5 GND GND
6 Reserved Reserved
7
8 Low Battery (Open Collector)
9 +12V (1KΩ source)
Rating and characteristics of pin 1 and 8 to GND
Parameter Value Conditions
Maximum collector
voltage
30V
Maximum collector
current
10mA
Maximum reverse
collector voltage
-5V
Maximum leakage
current
0.1μA Collector voltage = 20V,
pin function is not active
Typical voltage drop
0.5V Collector current = 5mA,
pin function is active
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