Universal dimmer actuators GDA2K-400 KNX / GDA4K-400 KNX
pdated: Mai-17 (Subject to changes) Page 55 of 63
4.5.2 Parameter: "Switching on/off with a 4-bit telegram"
In general, the setting "Yes" is required.
The setting "No" is available for use with special customer requests, e.g. in conference rooms.
The situation is described below.
A whole group of dimmer channels is operated from a button (4-bit).
A certain lighting situation has been adjusted by a scene or through other means – e.g. channel 1 OFF,
channel 2 40%, channel 3 50%. The requirement is to now dim up and increase the brightness of the
entire scene, but the channels which are switched off should remain off.
The parameter "Switch on/off with a 4-bit telegram" blocks the usual
switch on/off function of the 4-bit telegram.
Table 23
Parameter: "Switching on/off
with a 4-bit telegram"
4 bit
Telegram
Dimmer output
status
Response
yes
brighter/darker
Switched on
(1 %...100%)
Channel is normally dimmed
(to 0%
or 100% if
applicable).
brighter
Off
Channel is switched on and
dimmed
no
brighter /
darker
Off
Dimmer stays switched off
brighter /
darker
Switched on
(1%...100%)
Channel is dimmed in range
from min. to 100%
13
With the 4-bit telegram "Darker", the channel is switched off if the button is kept depressed for
longer than approximately 2 s when the minimum brightness is reached.