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Join Date: Sep 2007
Location: Give a monkey a brain...
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The other port is for a trigger to an unamplifies local source interrupt (LSI) switch or local source amplifier (LSA) switch, sending a signal to the switch to let it know the zone is active or not.
Check the manuals for specifics.
Believe nothing, no matter where you read it, or who said it, no matter if I have said it, unless it agrees with your own reason and your own common sense. -Buddha
Give a monkey a brain and he'll swear he's the center of the universe. -Fishbone