Delta 3KVA User Manual page 29

Its major functions normally some or all of following:
To broadcast a warning when power fails.
To close the files before the battery is exhausted.
To turn off the UPS 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.
Caution:
Every time when you connect your UPS and computer, please make sure the utility exists.
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