Broadcast mode

Figure 3.241: Schematic representation:
DALI dimmer, e.g. as a "rotary potentiometer" for flush socket installation.

  • for broadcast operation without addressing

  • switching by pressing and

  • dimming by turning the thumb wheel

  • commercially available are these control units as well with additional colour temperature control function for DT8 gears

In broadcast mode, all participants are controlled via one joint signal. Addressing is not required. Luminaires can be connected to the control device and operated without DALI commissioning (plug and play). The number of selectable control gear units is generally limited to 64 or fewer (see chapter ). An expansion can be achieved via one or more repeaters which can also be cascaded. Thus, the number of DALI participants that can be dimmed simultaneously is unlimited (see figure).

Electrical installation is done similarly to 1...10 V interface applications. In this respect, three of the aforementioned DALI properties (see above) prove advantageous in direct comparison to the 1…10 V interface:

  • Observing polarity is not necessary.

  • Various light sources are dimmed uniformly.

  • Connected luminaires can be switched using the interface.

If separate control for luminaire groups is intended, they must be operated at separate control lines.

With DT8 control gear units (Device Type 8, see chapter “DALI colour control”) and control devices supporting the particular DT8 commands, colour control can also be achieved in broadcast mode. Colour temperature adjustments can be made e.g. using a “DALI potentiometer” (see figure) by rotating the adjustment wheel while pressing it down.