K-BUS
®
KNX/EIB
Dimming Actuators
36
Chapter 4 Application Programming Introduction
It is able to set different parameters to every output channel, and control various targets by modifying the
setup of the internal parameters.
4.1. Switch
The output can be switched ON or OFF by 1 bit data. It is able to set the brightness value as the last one or a
defined one (1%-100%) when switching on the luminaries. It is able to set a delay time (changing time) to dim
UP the luminaries or dim UP gradually in the default period. When receiving the
OFF
message, the dimmer will
be switched off immediately, or dim DOWN gradually after a delay time (changing time) or in the default
changing period.
4.2. Relative dimming
4 data bits control: the relative dimming command means it is possible to dim UP or DOWN to the needed
brightness value during the set brightness threshold range. It is only valid to dim UP when the brightness value is
smaller than the low threshold value and dim DOWN when the brightness value is greater than the high threshold
value. It is also able to set whether to switch on the luminaries by the message “
dim UP to a certain value
” when
the output is 0 by this function. The relative dimming is used to control the relative changes of the brightness by 4
data bits: the lowest 3 bits are controlling-bit and the highest bit is----- “1” means dim UP, “0” means dim DOWN.
Explanation of setting relative dimming: (1-7: dim DOWN; 0-8 remain unchanged (stop dimming); 9-15 dim
UP)
Parameter value
0
1
2
3
4
5
6
7
Dim DOWN
Unchange/stop dimming
255
128
64
32
16
8
4
Parameter value
8
9
10
11
12
13
14
15
Dim UP
Unchange/stop dimming
255
128
64
32
16
8
4
4.3. Absolute dimming
8 data bits control: it is able to dim to the needed brightness value by changing the brightness parameters.
The setting of the parameters is similar as relative dimming with the brightness value range: one low threshold
value and one high threshold value. And it is not allowed to change the brightness value beyond the set range, the
max. range is from 0 to 255. This function offers the possibility to dim UP or DOWN to 0 gradually to the target
value by setting the delay time or the default time.
