D279A Operation and Installation Guide
D279A
Page 11© 2002 Bosch Security Systems 46456E
Operation
4.0 Operation
4.1 Loop Inputs
The D279A branches one zone or point of the panel into two separate loops: one delayed and one instant. Sensors can be
wired to these loops in series (normally closed), or in parallel (normally open), or both. The loops are supervised by a 1 kΩ
end-of-line resistor.
4.2 Delayed Loop
Faulting the delayed loop while the D279A is armed starts the 30-second entry delay time on both loops. Allowing the entry
delay time to expire without disarming triggers an alarm, even if both loops are restored. Exit time is provided when arming.
4.3 Instant Loop
Faulting the instant loop while the D279A is armed causes an immediate alarm. No entry time is provided unless the delay
loop is faulted first. An entry delay time will be provided if both the instant and delayed loops are faulted at the end of the
exit delay period. Exit time is provided when arming.
4.4 Restorals
When both the delayed and instant loops return to normal after an alarm, the D279A is ready to detect another alarm. When
one loop is faulted, a fault on the other loop cannot signal a new alarm to the panel. The restoral to the panel occurs
3 seconds after both loops are restored.
4.5 Entry/Exit Delay
Both loops must be normal before the D279A can be armed. When you enter your passcode, an exit delay of 60 seconds is
provided before the unit arms. An entry delay time will be provided if both the instant and delayed loops are faulted at the
end of the exit delay period. When the IZC (Independent Zone Control) is armed, faulting the delayed loop starts an entry
delay of 30 seconds. The D279A must be disarmed during this entry time to prevent an alarm. Once entry or exit delay starts,
both loops are delayed.
4.6 Arming and Disarming
Entering the passcode arms and disarms the D279A.
4.7 Burglary Alarm Output
Opening or shorting the delayed or instant loop while the D279A is armed causes the output (green wire) to short the panel
zone (after entry delay on delayed loop) or point for a minimum of 3 seconds.
4.8 Panic Alarm Function
Simultaneously pressing both asterisk [*] buttons shorts the Panic output (yellow wire) and initiates an alarm. Panic
outputs from several D279A Independent Zone Controls can be connected to the same zone or point. If you do this, place
the J4 jumper on the bottom two pins (see Figure 2 on page 9). The Panic output can be connected to the same zone or
point as the burglary alarm output, but if you do this, the Central Station will not be able to distinguish between panic and
burglary alarms. It is recommended that you NOT wire panic and burglary alarm outputs together to zones or points
programmed for opening and closing reports.
4.9 Relay Output
A Form “C” relay (with normally open and normally closed contacts) is provided for connection to an optional
annunciation device, such as a bell or light. An external supply may be required to power this optional annunciation device.
The relay activates when the D279A goes into alarm. It resets when the D279A is disarmed.
Panic [*] buttons: Pressing the Panic [*] buttons does NOT activate the relay.
4.10 Delayed LED
This green LED lights when the delayed loop is normal. It is not affected by armed status.
4.11 Instant LED
This green LED lights when the instant loop is normal. It is not affected by armed status.
(2 pages)
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