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BUILDING AUTOMATIONS

Motion detector

20850, 19850, 16850, 14850

Passive infrared motion detector, KNX standard, grey – 2 modules.

Functionality

This device detects motion within the sensor's range of action.

When the movement has been validated by an internal filter, a

"presence message" is sent over the KNX bus and the green

LED lights up. This is done according to the set brightness

threshold. Note that the green LED does not light up every time

a movement is detected, but only when a "presence message"

is sent.

The device is capable of activating a movement event from an

external source or from any KNX device.

A twilight sensor is also present which causes the lights to be

turned on or off according to daylight brightness levels. It is

possible to set two types of threshold (upper and lower) and to

perform various operations according to the current level.

These actions allow individual or cyclical On/Off messages to

be sent. It is also possible to postpone message sending to

validate the effective level of the light sensor. For MASTER-

SLAVE operation with multiple motion detectors, refer to

the explanation of KNX object no. 2 "External trigger".

Behaviour after bus on/off

Bus off: data are not saved.

Bus on: motion detection is enabled after 30 seconds,

the time necessary for the IR sensor to stabilise.

Behaviour after reset

As for bus on.

Communication objects

List of existing communication objects

20850 198501685014850

Communication objects

KNX objects: motion detector in detail.

Motion detector communication objects

NumberETS nameFunctionDescriptionLengthFlag 1

CR W TU

0Motion

detector Movement switch(if the "Motion Detector" parameter is enabled) - a bit that goes to "1" if a

movement is detected1 bitXX

1Motion

detector Forced Disabled

(if the "Motion Detector" parameter is enabled) to deactivate the motion

detector via the bus so that the device does NOT send multiple messages

on detecting a moving body

1 bitXX

2Motion

detector External trigger

(if the "Motion Detector" parameter is enabled) if there are multiple PIRs

set as "Motion detector" controlling the same light, choose one as MAS-

TER and associate its "Command on movement" object with the "Trigger"

objects of the other SLAVE PIRs in the same group as the relay to be con-

trolled (so for the SLAVE PIRs the "Command on movement" object will

be unused). This way each SLAVE PIR will be able to reset the time count

of the PIR, which via the "Command on movement" object efMASTER-

fectively activates/deactivate the light relay of the same group. For exam-

ple, in a long corridor this ensures that the light does not go out during the

time it takes to walk from the detection zone of one PIR to that of another

1 bitX X

4TwilightSwitch if the "Twilight" parameter is enabled: the light turns on/off according to

daylight brightness levels1 bitXX

5TwilightForced Disabled

(if the "Twilight" parameter is enabled) to deactivate the twilight sensor via

the bus so that the device does not send multiple messages on reaching

the set daylight brightness threshold

1 bitXX

CRW T= Communication; = Read; = Write; = Transmission; = Enable updateU

Motion detector: communication objects

Produktspezifikationen