D279A Operation & Installation Manual
Copyright © 2000 Radionics
Page 11
46456B
D279A
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 k
W
end of line resistor.
4.2
Delayed Loop
Faulting the delayed loop while the D279A is armed starts the entry delay time on both loops. Allowing the entry
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. 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 three 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. 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 to short the panel zone
(after entry delay on delayed loop) or point for a minimum of three seconds.
4.8
Panic Alarm Function
Simultaneously pressing both asterisk buttons shorts the Panic output 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). 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 (asterisk) buttons:
Pressing the Panic (asterisk) 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.
4.12
Armed LED
This red LED is off while the Independent Zone Control is disarmed. It blinks after you enter your passcode to
indicate exit time in progress, and remains lighted while the system is armed. It is not affected by alarms.
