KNX Universal Interface
Product Manual
©2019 INTERRA 14 PM190207005BEN
3.3. DIMMING
3.3.1. Description
With this function it is possible to dim and switch a
lighting circuit using one or two pushbuttons. There
are two different objects for each function and they
are controlled depending on the duration of the
push button press. A short press is processed as
switching action and the value (1 bit) is sent via
“On/Off” object. Otherwise a longer one is
interpreted as dimming and the value (4 bit) is sent
via “Dimming” object. The minimum period for
detecting a long push button action is
parameterized previously. When the button is
released after a long press a “stop” telegram is sent.
The dimming function can be configured with 1
button or 2 buttons:
Dimming with one button: Just one input is used for
dimming function. Short presses are interpreted as
toggle action (function described above) switching
on and off alternately in every press. For longer
presses the behaviour is similar, each press of the
button sends to the bus 4-bit object with the value
“up” or “down”. If “up” is transmited through the first
long press, the next value will be “down” and
viceversa. The object value can be update via the
bus from others devices thus there is an status
object, only visible with this configuration, which
prevent any incorrect behaviour. This object must
be connected with the state of the actuator via a
group address.
Dimming with two buttons: Two inputs are
necessary for this option. Each input providing the
function of one push button defined as “Up” or
“Down” through the parameter “Direction” . One
input configured as “Up” will send ON and increase
telegrams while another configured as “Down” will
send OFF and decrease telegrams.
3.3.2. Parameters
This parameter is used to configure whether the
dimming function works with 1 button or 2.
Dimming with 1 Button: when the contact is closed
briefly the inverted value of the status is sent via
“On/Off” object. Otherwise if the the push-button
is pressed longer a dimmer telegram is sent via
“Dimming” object. The dimming telegram can be
“up” or “down”, it depends on the status. When the
button is released after a long press a “stop”
telegram is sent.
Dimming with 2 Buttons: when the contact is
closed briefly the value “on” (corresponding to UP
direction parameter) or “off” (corresponding to
DOWN direction parameter) is sent via “On/Off”
object. Otherwise if the the push-button is pressed
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