 sensors and push-buttons), bus power supplies (which may be built into any of the products), control gear (e.g., electrical ballasts, LED drivers and dimmers) that have DALI interfaces.Application controllers can control, configure or query each device by means of a bi-directional data exchange.The DALI protocol permits devices to be individually addressed and it also allows multiple devices to be addressed simultaneously via group and broadcast messages.DiiA - Introducing DALI

Each device is assigned a unique short address in the numeric range 0 to 63, making possible up to 64 control gear plus 64 control devices in a basic system.