Filtering Of Intruder Alarms - ADE Accenta G3 Engineering Information

Accenta/Optima G3 intruder system
These outputs would normally be connected
directly to the input channels of wire in type
communicators and STUs.
Alternatively each output can be used to drive a
relay(coil resistance > 1200 W ) connected
between the output terminal and the 13V supply
terminal. The relay will energise when the
output port operates. It is recommended that a
back EMF protection diode is used in parallel
with the relay coil.
FIRE The fire output operates when the fire
zone is triggered.
PA The PA output operates when a PA alarm is
triggered or a duress code is used.
INT The intruder output is operated when an
intruder condition is triggered whilst the system
is set.
SET The Set output operates whenever the
system becomes set and is used to indicate
opening and closing.
ABORT Operates when an intruder alarm
condition is switched off.
CONF The confirmed alarm output operates
when 2 independent zones are activated during
the same alarm condition.
Important Notes
a. Each output has been configured as
active low and will normally require the
EPROM or NVM for the communicator
or STU to be programmed as active
low or positive removed. However
there may be differences between
some pieces of equipment and some
Alarm Receiving Centres (ARCs).
b. Where the communicator is powered
from an external source, not the panel
and the outputs are being used without
relays, the panel and external power
supply will require a commoned
negative supply rail.
4PI175 issue 1_6/01
Engineering information
c. If the communicator is not fitted inside
the panel and abort is being used, care
should be taken to ensure that the
abort connection cannot be damaged
or severed as this could cause the
ARC to incorrectly filter an alarm
signal.
d. It is very important that communicating
systems are fully tested and that all
signals are correctly received at the
ARC when the system is installed and
serviced.

Filtering of Intruder alarms

A condition of most police Force Policies and
under the guidance of NACOSS NACP 14
(Code of Practice for intruder Alarm Systems
Signalling to Alarm Receiving Centres) is that
all intruder alarm signals received by an Alarm
Receiving Centre (ARC) must be filtered to
establish their validity before passing to the
police.
The exact method of filtering should be decided
according to the regional Police Force Policy
and ARC procedures.
In general, the panels offer the following
methods which could be used to filter an alarm.
Set/Unset A Set or Unset signal which is
received by the ARC at around the same time as
an intruder signal can be used to filter the alarm.
Abort Output The abort output operates
whenever a user code is entered or a keyswitch
is used to switch off an intruder alarm condition.
When an abort signal is received by ARC at or
around the same time as an intruder signal, the
alarm can be filtered.
Restore of the Intruder Output The intruder
alarm output is restored to 12V whenever a user
code is entered or a keyswitch is used to switch
off an intruder alarm condition. Where an
intruder alarm is shortly followed by a restore at
the ARC, this can be used to filter the alarm.
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