Setting The Jumper Options - ADEMCO 7720PLUS Installation Instructions Manual

SETTING THE JUMPER OPTIONS (Set Before Installing)
Removing The Cover
Remove the 7720PLUS's cover by inserting a screwdriver into the 4 removal points at the bottom of
the unit and gently releasing the locking tabs from the cover slots as shown.
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(J2) Zone Inputs Activate on High or Low
If using zone input connections, set the J2 jumper so that zone 1 & 2 inputs are activated either with
a ground or with a positive voltage, whichever is required.
If the trigger level is set for positive voltage, +4.5 to +14.2 volts must be applied to zones 1 & 2 to
trigger an alarm. If the zone is connected to a normally high voltage trigger (i.e. goes low on alarm),
invert this zone when programming (questions 13 and 14).
If ground is selected, zones 1 & 2 are internally pulled up to 5 volts through a 10k ohm resistor. This
voltage should normally be pulled down (closed contact to ground) and released for alarm (opening the
contact). If a normally open contact is being used, invert this zone when programming (questions 13
and 14).
(J3) Fault Output Select
Refer to the diagram on the following page when setting jumpers.
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