As well as motion detection, the Motion Sensor 360 - KNX has an integrated brightness sensor which can be used to great effect. In ETS you will find the ‘Brightness’ tab on the left hand side which contains the brightness parameter menu.
By default, the sensor will use the internal brightness sensor, but there is the option to use an ‘external device’ which, when selected, gives a group object that can be connected to another, third party brightness sensor in the KNX system. When using the internal brightness sensor there is a ‘Calibration object’ parameter which, when enabled, shows a group object that can be sent a LUX value. We recommend doing this by using a handheld LUX meter, measuring the brightness below the sensor in the room, then when the LUX value is sent to the sensor via the group object the device will then calibrate the sensor to it environment.
The ‘Transmit update on’ parameter lets the integrator configure how often the measured LUX value is transmitted on the bus. 'Cyclical' sends this value at the interval (in seconds) set on the ‘Cyclical transmission of brightness’ parameter. 'Change of value' only transmits when the LUX reading changes by a change greater than the value set on the ‘Transmission on change greater than’ parameter. There is also the option to transmit brightness value on change and cyclically.
We have also included the option to set brightness threshold objects. These can be used to trigger actions when the LUX reading reaches a certain level. There are up to 2 trigger objects available so the sensor can be commissioned to monitor for a greater than and a lower than threshold from the same device. For each trigger object the threshold is set in LUX, there is also a hysteresis value (deadband value) and the option to set whether a ‘1’ or a ‘0’ is sent on the group object at that specific trigger object.
A great use case example of these brightness threshold triggers might be do send a command to lower blinds if it is a particularly bright day. This could be useful to protect flooring, furniture or art work that could be damaged by too much persistent sunlight.
These various brightness specific parameters give the device some added functionality that can make for a more intelligent, comfortable, and energy efficient KNX building.
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