The transmission of bus signals in building automation systems is possible via cables, but also via a radio system. This eliminates the need for complex cabling, so that the radio bus is a simple method, especially for the subsequent installation of a bus system, and is characterized by a high degree of flexibility. However, it should be noted that the additional measures required by DIN 18015-4 are taken to prevent the data telegrams from being disturbed from the outside or interfering with neighbouring systems.
A physiological load due to the radio signals can be excluded, as the system only emits a radio signal when activated. This means that no permanent electromagnetic fields are generated in the building.
A major disadvantage of radio bus systems, on the other hand, is that the sensors and actuators are usually battery-powered. In the meantime, however, there are also sensors and actuators that are not dependent on a supply of batteries, but generate the necessary energy to send a radio signal via the piezo effect, for example.
Source: bauwion
