Art. No. SC 1000 KNX
4.2.4.2.4 Dimming function
For each rocker or each button with the function set to "Dimming", the ETS indicates a
1-bit object and a 4-bit object. Generally, the push-button extension module transmits a
switching telegram after a brief press and a dimming telegram after a long press. In the
standard parameterisation the extension module transmits a telegram for stopping the dimming
action after a long press. The time needed by the extension module to detect an actuation as a
long actuation can be set in the parameters.
The status LEDs can be configured independently (see page 161-162).
Single-surface and double-surface operation in the dimming function
As a rocker, the device is preprogrammed for double-surface actuation for the dimming function.
This means that the extension module transmits a telegram for switch-on after a brief press and
a telegram for increasing the brightness after a long press of the left button ("brighter").
Similarly, the extension module transmits a telegram for switch-off after a brief press and a
telegram for reducing the brightness after a long press on the right button ("darker").
As a button, the device is preprogrammed for single-surface actuation for the dimming function.
In this mode, the extension module transmits on each brief press ON and OFF telegrams in an
alternating pattern ("TOGGLE"). After a long press, the extension module transmits "brighter"
and "darker" telegrams in an alternating pattern.
The parameter "Command on pressing the button" or Command on pressing the rocker" on the
parameter pages of the buttons or rockers defines the single-surface or double-surface
operation principle for the dimming function.
For the rocker and also for the button function, the command issued on pressing the button or
rocker can basically be selected at the user's discretion.
Advanced parameters
For the dimming function, the extension module can be programmed with advanced parameters
which are hidden in the standard view for greater clarity. If necessary, these advanced
parameters can be activated and thus be made visible.
The advanced parameters can be used to determine whether the extension module is to cover
the full adjusting range of the actuator with one dimming telegram continuously
("Increase brightness by 100 %", "Reduce brightness by 100 %") or whether the dimming range
is to be divided into several small levels (50 %, 25 %, 12,5 %, 6 %, 3 %, 1,5 %).
In the continuous dimming mode (100%), the extension module transmits a telegram only at the
beginning of the long press to start the dimming process and generally a stop telegram after the
end of the press. For dimming in small levels it may be useful if the extension module repeats
the dimming telegram in case of a sustained press for a presettable time (parameter "Telegram
repetition"). The stop telegram after the end of the press is then not needed.
When the parameters are hidden ("Advanced parameters = deactivated"), the dimming range is
set to 100 %, the stop telegram is activated and the telegram repetition is deactivated.
Full-surface operation
When a rocker is used for dimming, the extension module needs some time at the beginning of
each operation in order to distinguish between a short and a long operation. When the full-
surface operation is enabled in the ETS, the extension module can make use of this time span
to evaluate the otherwise invalid simultaneous actuation of both actuation points.
The extension module detects a full-surface operation of a rocker if a control surface is
depressed over a large area so that both buttons of the rocker are actuated.
Full-surface operation must have been detected before the first telegram has been transmitted
by the dimming function (switching or dimming). If this is not so, even a full-surface operation
will be interpreted as a wrong operation and not be executed.
Full-surface actuation is independent. It has a communication object of its own an can optionally
be used for switching (ON, OFF, TOGGLE – toggling of the object value) or for scene recall
without or with storage function. In the last case, a press on the full surface causes a scene to
be recalled in less than a second. If the extension module is to send the telegram for storing a
scene, full-surface actuation must be maintained for more than five seconds. If full-surface
actuation ends between the first and the fifth second, the extension module will not send any
telegrams. If the status LEDs of the rocker are used as "button-press displays", they will light up
for three seconds during transmission of the storage telegram.
Page 147 of 347
Software "Smart Control 501511"
Functional description
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