MDT SCN-DTSEN1.01 Technical Manual page 10

Technical Manual
Twilight-/Temperature Sensor KNX [SCN-DTSEN1.01]
Threshold value 1 / 2
Two threshold values can be configured independently of each other. It is possible to adjust the
resolution of the brightness range. With the setting "twilight 10-1000 Lux", a threshold value can
be finely adjusted in a range of less than 1000 Lux (typical range for twilight).
With the setting "brightness 1-100 kLux", a threshold value can be set in a range from 1000 lux to
100000 lux (typical values for sunlight).
The threshold value is determined by one value each for the "Upper limit" and the "Lower limit".
To avoid frequent triggering, a minimum time can be set for exceeding and falling below the
threshold. This means that the set limit value must be permanently exceeded/undercut for this
time before a telegram is sent.
This avoids, for example, frequent movement of the sunshade when a cloud only darkens for a
short time.
Datapoint type
The selected datapoint type determines whether either "ON" or "OFF" telegrams (1 bit) or scenes
(1 byte) are sent when the threshold value is exceeded/undercut.
The determination is made via the parameters "Value/Scene number when exceeded/undercut".
In addition, it can be determined whether the telegrams are to be sent cyclically.
Reacts to lock object: Threshold values
The communication object 4 "Lock object: Threshold values" is permanently displayed. For both
threshold values, it can be decided in each case whether this should react to the lock object.
Example:
Set the parameter for threshold value 1 to "active" and for threshold value 2 to "not active".
If a "1" is now sent to the lock object, the lock only affects threshold value 1.
The lock is cancelled with a "0".
The following table shows the associated communication objects:
Number Name/Object function
1 Brightness – Send measured value
2 Brightness – Threshold value 1
3 Brightness – Threshold value 2
4 Brightness – Lock object: Threshold
values
Table 5: Communication objects – Light sensor
MDT technologies GmbH • 51766 Engelskirchen • Papiermühle 1 • Germany
10
Phone: +49-2263-880 • knx@mdt.de • www.mdt.de
Length Usage
2 Byte Sending the current measured value
1 Bit Sends a telegram when threshold value
1 is exceeded/undercut.
1 Byte
DTP depending on parameter setting.
1 Bit Sends a telegram when threshold value
2 is exceeded/undercut.
1 Byte
DTP depending on parameter setting.
1 Bit Set/unset a lock