P73335u_UPS_man.qxd
Communication Interface (continued)
8-2 Dry Contact
Pin 4:
Output signal transfers from HIGH to LOW when utility fails.
The pin is normally at high level.
Pin 6:
Output signal transfers from HIGH to LOW upon low battery.
The pin is normally at a high level.
Pin 3:
The UPS will shut down when a high level sustained for at least
3.8 seconds is applied.
Pin 5:
Signal ground.
Other: Not used.
The communication port at the back of the UPS may be connected to a
computer. This port allows the computer to monitor the UPS and control the
operation of the UPS in some cases. Its major functions normally include
the following:
• To broadcast a warning when power fails.
• To close the files before the battery is exhausted.
• To turn off the UPS and computers.
Some computers may have a special connector to link this communication
port, or require a special plug-in card, or need a special UPS monitoring
software. Contact your dealer for details of different interface kits.
4/30/01
12:19 PM
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Low Battery
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