The basic elements are defined as:
- A sensor connected to coupler.
- A coupler with a Micro-controller "Intelligence"
- An actuator, which responds to the sensor's instruction.
- The bus line, through which the information flows.
Note: If the coupler is separated from the sensor, you can connect different types of sensors to it. Some keyboards come with the coupler integrated, in that case it is not possible to connect other sensors into that coupler. And always, one sensor for one coupler.
A domotic component if formed by the sensor (keyboard), the coupler and the actuator. Therefore each component must be from the same manufacturer so they can comunicate properly.
On the other hand, different components can be from different manufacturers and they can communicate with each other, thanks to the KNX Standard. (Notice: this only applies for KNX manufacturers).
THE WIRING:
The sensors and the coupler are only connected to the red-black wire low voltage, where the information is sent.
The actuator has a connection to the bus (red/black wires) in order to get the info. And it is also connected to de AC current by the conventional wires.
NO LOOPS: It is crucial not to have any loops on the red-black wiring, otherwise the components can get damaged.
