18
The use of high-quality, sensitive receivers results in a wireless range of up to 300m in free-
field.
Here, the term ‘free-field’ stands for the ideal case, in which there is direct visual
contact between the transmitter and receiver, as in a meadow, for example.
In practice, however, walls, windows, doors and concrete ceilings or other objects
between the sensor and the base station may reduce the range.
Weak batteries also reduce the range.
You can find further information in section ‘16. Information on the range’, page 107.
The radio transmission takes place in the 868 MHz frequency band (868.0 to 868.6 MHz). Thanks
to the legal restriction of transmission duration in this band to a maximum 36 seconds per hour
(1% duty cycle; 1 hour = 3600 seconds), the danger of interference from other radio services
is minimised.
Unlike the 433 MHz frequency band, which most conventional wireless alarm sys-
tems use, no permanent transmitters can emerge in the 868 MHz frequency band
(for example, wireless headphones).
Such devices can permanently disrupt another radio transmission, which makes it
impossible to transmit an alarm signal.
c) ‘disarmed’, ‘int. armed’ and ‘ext. armed’ operating modes
• ‘Disarmed’ operating mode
In the ‘disarmed’ operating mode, all sensors are deactivated (except for the smoke detectors,
which are always active). You can move around your house freely without setting off the
alarm.
The alarm is always set off when a smoke detector or one of the glass break sensors
connected to a door/window detector is triggered.
• ‘Internally armed’ operating mode
This provides protection of the exterior of a building. This protects you against intruders from
outside (at night, for example), whilst you are in your house. You can move around freely
within your house, while the exterior shell of the house (doors, windows, etc.) is monitored.
• ‘Externally armed’ operating mode
This operating mode serves to monitor a house whilst it is unoccupied. The indoor rooms are
also monitored (for example, via PIR motion detectors).
‘external’ sensor assignment (setting the sensor attribute in the alarm base station’s
‘
I n t e r n : N
I n t e r n : N
I n t e r n : N
I n t e r n : N
I n t e r n : N
’ menu)
Sensor is triggered for ‘internally armed’ and ‘externally armed’
‘internal’ sensor assignment (setting the sensor attribute in the alarm base station’s
‘
I n t e r n : Y
I n t e r n : Y
I n t e r n : Y
I n t e r n : Y
I n t e r n : Y
’ menu)
Sensor is only triggered for ‘externally armed’
Summary of Contents for FAZ 3000-PIR-2
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