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Motion Detector
3.3.1.2 FALSE "NOT OCCUPIED" DETECTIONS
To prevent undesired detections of no-presence, it is possible to send the KNX bus an
order to save the scene as soon as the trigger value is received, provided that the
current presence state is "Occupied". After the listening time, if no further detections
have taken place, the presence detector will switch (as usual) to "Not Occupied", and
send the bus the corresponding value.
In these circumstances, if motion is detected again without a new reception of the
trigger value, then the above situation will be considered as a false "Not Occupied"
detection (as there was still presence in the room). An order will be sent to play back
the scene previously saved (this will make the room recover the state it had prior to
sending "Not Occupied") and the detector will switch back to "Occupied".
Example: false "non-occupied" detections.
Suppose a room with two people sleeping inside (state "Occupied"). If the false non-
occupied detections are being ignored, when one of them leaves, the room will switch
to "Not occupied". Afterwards, when the other person makes a movement, the room will
switch to "Occupied" and the corresponding order will be sent, so for example the lights
will turn on. On the contrary, with this option in use, such action will not take place
when the person in the room makes a movement, as the trigger value (i.e., the door
being opened) has not been received again.
The only parameters of this function are:
Non-Occupied False Detection: enables or disables this functionality.
Scene Number: number of the scene (1 – 64) to be used.
Figure 24. False Detection of the Non-Occupied event
3.3.2 SLAVE
Slave detectors notify the master detector about detection and no-detection situations
by sending one "1" or one "0", respectively, through the "[Ix] Presence: Slave Output"
object. However the only way a slave can switch from the detection state to the no-
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