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©
1999 Directed Electronics, Inc.
Your system has DEI's Nuisance Prevention® Circuitry (NPC
™
). It
prevents annoying repetitive trigger sequences due to faulty door
pin switches or environmental conditions such as thunder, jack-
hammers, airport noise, etc.
Here's how it works: Let's say the alarm triggers three times. Each
time, the same sensor or switch is triggering the alarm. The three
triggers are within 60 minutes of each other. NPC will interpret
this pattern of triggers as false alarms. After the third trigger, NPC
ignores, or bypasses, that sensor or switch (along with any other
sensors or switches sharing the same zone).
If the bypassed sensor tries to trigger the system while it is being
bypassed, the 60 minute bypass period will start over. This ensures
that a sensor that continuously triggers will remain bypassed.
Doors are covered by NPC differently: If the alarm is triggered by
an open door for three full cycles (one-and-one-half minutes), the
doors will be bypassed until the trigger ceases.
NOTE: Arming and disarming the system does not reset this function!
The only ways to reset a bypassed zone are for it to remain untriggered
for 60 minutes, or to turn on the ignition. If testing your system, it is
important to remember that the NPC programming can cause zones to
be bypassed and seem to stop working. If five chirps are heard when dis-
arming, NPC has been engaged. If you wish to clear the NPC memory,
turn the ignition on.
Nuisance Prevention® Circuitry