Page 190 - Advanced Course

KNX ADVANCED COURSE

Establishing the control characteristics for L1 and L2
Switch off the ambient lighting (artificial sun)
Dim the lighting to the required brightness value. Note that the window luminaire (L1)
requires a lower modulation (see also the sketch of the characteristic curve below).
Mark the group address ‘Calibration request’ and select the item “read/write…”. In the
telegram monitor then check if it is already online, otherwise connect to the bus first
before the next step !
Now be sure the selected group address still is selected; click on the “write” – button
and enter the value ‘1’ for control characteristic 1 (L1), then click on “OK”.
Change to the ‘Read value’ page and read out the status of the group address
‘Dimming value for calibration’. Note the value.
Now read out the status of the group address ‘Brightness value for calibration’. Also
note this value.
Repeat the process for control characteristic 2 (L2).

An interpolation point of the two control characteristics is now known. Determine further
points (at least 3) with different ambient light values (simulated external brightness
values), whereby the last one should be carried out at the maximum brightness level of
the ‘artificial sun’. Your determined values (hex code) could look as follows:

Characteristic 1 Characteristic 2
Measured value of Dimming value L1 Measured value Dimming value
sensor of sensor L2
02A3 FF 02A3 B8
0651 7A 0651 4F
0F0A 37 0F0A 07
2714 01 2714 00

Converting the determined interpolation points of the characteristic curves

As only decimal values can be entered in the parameters for the interpolation points of
the characteristic curves, the determined hex values must be converted into decimal
values. To do so, use the calculator (scientific) in the ‘Programs’ folder under
‘Accessories’.

Example:

Control curve 1 Control curve 2

Dimming value Dimming value

255 255
L1 184 L2

122 Measured
Measured 79 value
55 value
7
675 1617 3850 10004 675 1617 3850 10004

Home and Building Management Systems KNX Association
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