Description of application and parameters
Application "2-button dimming"
KNX Technical Reference Manual 1473-1-8905 / 2CKA001473B8905
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10.14
Application "2-button dimming"
NOTE
The application is valid for the following parts of the device:
■
Button 1 / rocker 1
■
Button 3 / rocker 2
With the "2-button dimming" application, a button has communication objects for switching and
for dimming. A distinction is made between a short (switching) and long (dimming) press of the
button. Here the application does not differentiate between whether the button is operated on
the left or right side. In each case, the application makes a separate set of parameters and
communication objects available for the right and left side of the button. It also makes dimming
a lamp possible via one side of the button and assigning a further "button-oriented" function to
the other side of the button.
10.14.1 General parameters - Time for long operation
Options:
00.300 ... 03.000
A differentiation can be made between a short or long operation of the button. With a short
operation of the button, the next level forward is switched to in each case. With a long
operation, the first level is activated. Thus with a long button press a jump back from every
position to the first level is possible, without having to run through the remaining levels.
Via the "Duration of long operation", the time is specified from which a long button press is
recognised and the object values are reset. The first level must be set again with a press of the
button. Any time from 0.3 to 3 seconds can be set. A typical value after which a jump-back to
level 1 is made is 0.4 s.
10.14.2 General parameter - Manner of dimming
Options:
Start-stop dimming
Step-wise dimming
You can switch between the two dimming versions "Start-Stop dimming" and "Step-wise
dimming" via this parameter.
"Start-Stop dimming" means that exactly two 4-bit telegrams for dimming are always sent out.
For triggering of a dimming command, a telegram with the information "Dim by 100% brighter"
or "Dim by 100% darker". When the button is released, the second telegram is sent out with the
"Dimming stop" information. Hence, a connected dimming actuator can be halted at any time
during the dimming phase.
The second dimming procedure is the step-wise dimming ("Dim stop is not sent" setting). For
step-wise dimming, a defined value, e.g. "Dim brighter by 6.25%" is always sent out for
triggering of a dimming command. This dimming procedure can be utilised if dimming sensor
and actuator are installed in different lines. In this case, telegram delays can occur through a
coupler and thus varying brightness values if multiple dimming actuators are to be activated in
different lines.