The alarm repeat interval set for the device is not used for this type of zone. Instead, it is set to a value of 5 seconds.
Thus, pressing the panic button again not earlier than after 5 seconds will result in the transition of another event
to the panel.
“Temperature Sensor” Zone Type
If a wired temperature sensor is connected to the device, and the 1-Wire line polling mode is enabled (enabled
on the
tab), it will appear automatically in the “Zones” tab and will have a zone number in the
range from 48 to 51. For temperature sensors, the upper and lower thresholds shall be specified, at which alarms
will be generated. Range of permissible values for thresholds: from -55
∘
C to 127
∘
C. Read more
. A total of 4 temperature sensors can be connected to the device.
5.3.5
Zone Normal State
Using the value that is set in the “Norm” column, it is possible to define
normal
state for the alarm zone:
∙
if the normal state for the zone is defined as
closed
, then there shall be detectors in this zone. which also
have
closed
contacts of their output relay in the normal state. In case of alarm, these detectors shall
open
the
contacts of the output relay;
∙
if the normal state for the zone is defined as
open
, then there shall be detectors in this zone, which have
open
contacts of their output relay in the normal state. In case of alarm, these detectors shall
close
the contacts
of the output relay;
It shall be noted that the vast majority of modern infrared and magnetic contact detectors have
normally closed
contacts of their output relay. Thus, for zones with these detectors, the normal state shall be defined as
closed
.
5.3.6
Terminating Resistors
Using the value, which is set in the “Resistors” column, it is possible to specify the number of terminating resistors
installed in the zone.
If the terminating resistors are not used when connecting the zone, then for this zone the device can determine only
one of two states: “Alarm” or “Norm”. This zone is very vulnerable: if the normal state for the zone is defined as
open
, then it is very simple to cut the zone cable in any accessible location, and the zone will remain in the normal
state forever, there will never be any alarms on such a zone. The zone, which normal state is defined as
closed
, does
not look any better: if one can short-circuit the signal cables of the zone, then there will never be any alarms on it.
One terminating resistor, installed in the zone, allows to distinguish the failure in the zone from the alarm. What
kind of fault can be detected - break or short circuit - depends on the normal state of the zone: for the zone
open
normal state, one terminating resistor allows to determine the zone break, and for the
closed
normal state – short
circuit.
Two terminating resistors allow to determine both break and short circuit for a zone with any normal state.
For
minimal
counteraction against the alarm zone disabling, it is recommended to include one termi-
nating resistor in the zones.
5.3.7
Entry Delay
The “Entry delay” parameter will allow delaying the generation of the “Alarm” signal for the time, which is indicated
as the value for this parameter. Typically, this parameter is set for zones that the user
shall
violate to get to the
alarm management device. As common examples of such zones, one can mention magnetic contact detectors that
protect entrance doors to a guarded room.
How does the entry delay work? Suppose that we have a zone, it includes a magnetic contact detector, which is
installed on the entrance door to the office. For this zone, an entry delay of 15 seconds is specified. The codebook,
with which it is possible to disarm it, is inside the office, that is, it is necessary to open the front door to get to it.
The user opens the entrance door, the magnetic contact detector is triggered, but the device does not generate an
alarm, but starts counting the entry delay. If within 15 seconds the user enters the code with which the alarm will
be disarmed, the alarm will not be generated, instead of it an event will be sent to the security panel to disarm the
device. If the device is not disarmed within 15 seconds, an alarm will be generated.
The value of the “Entry delay” parameter can be specified only for zones of the type specified as “Arm” or “Arm
without siren”. This is due to the fact that zones of all other types (with the exception of “Bypass”) cannot be
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