Page 86 - Basic Course

KNX BASIC COURSE

5.2 Dimming with cyclical telegrams

DIMMING SPEED OF THE ACTUATOR SHALL BE ADAPTED TO THE CYCLICAL TRANSMISSION OF DIMMING TELEGRAMS

Brightness

100%

7/8

6/8
5/8

4/8

3/8

2/8

1/8

Time
+ 12,5 % + 12,5 % + 12,5 % + 12,5 % + 12,5 % + 12,5 % + 12,5 % + 12,5 %

Figure 6: Dimming with cyclical telegrams
In a system controlled by wireless remote controls, e.g. infrared senders, the transmission
signal might be interrupted as somebody passes through the IR beam. In order to avoid a
situation where the dimming actuator does not receive important telegrams (e.g. the stop
telegram), in most cases one will choose the setting 'cyclical dimming' during
parameterisation of a remote control. The transmitter in these settings transmits the
telegram “increase brightness by 12,5 %”. The consequences of losing such a telegram
are not as serious as the loss of a stop telegram, which is only sent once.

Home and Building Management Systems KNX Association
KNX Bus Devices Bus devices_E1213a 12/16