
Technical Manual
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Central Operation Unit Smart
MDT technologies GmbH •
51766 Engelskirchen • Papiermühle 1
Phone: +49-2263-
880 • Fax: +49-2263-4588 • [email protected] • www.mdt.de
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Text messages
In addition to the 4 status displays, a further 4 text messages with a maximum of 14 characters can
be permanently set. These 4 text messages are shown on the display as soon as the associated
communication object receives the value 1. The message remains until it is acknowledged by push-
button or a defined time has elapsed. A fifth variable text message can also be activated. Any text
with a length of 14 characters can be sent to this object. When the object is received, this variable
text is shown in the display until it is acknowledged by pressing the key or until a defined time has
elapsed.
Active colour display
The Central Operating Unit Smart has a large, active colour display. This is adjustable in 10 brightness
levels and has an automatic adjustment by a brightness sensor. The display of the background colour
can be set to white or black for day or night operation, depending on customer requirements.
Logic functions
The application of the Central Operating Unit Smart provides a total of 6 logic functions with which
nested function calls can also be implemented, e.g. to enable a scene call in day mode only. The logic
function can process both internal and external status information. This enables, for example, a
second telegram to be triggered when a button is pressed. The logic operations AND, OR and XOR are
available. If the conditions are met, 1 bit / 1 byte values can be sent at the output or scenes can be
called up.
Device Configuration App
The DCA app for the Central Operating Unit Smart is available for free download in the KNX Online
Shop and on the MDT homepage. DCA Apps are supported from ETS 5 on. The file of the DCA App
"MDT_DCA_Operation_Unit_Smart_v10 .etsapp" will be installed as an additional app after the
download in ETS 5.6.x. After successful installation, the DCA app appears in the application of the
Central Operating Unit Smart. With this app, pictures/symbols in the Central Operating Unit Smart
can be exchanged for own symbols. The images to be reloaded must meet the following
requirements:
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Format: Bitmap
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Size: 64x64 Pixel
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Colour: Black/White
Already finished symbols/icons can be found in a good quality and selection on the Internet at the
KNX User Forum at:
https://service.knx-user-forum.de/?comm=iconset
The symbols / icons in the KNX User Forum are available in the formats *.hsm, *.png and *.bmp.
For the Central Operating Unit Smart, please select the *.bmp format.
Mounting height
The recommended mounting height for the Central Operating Unit Smart is 1.6 m.