DALI, light through a simple touch

October 2019LED technology

What is DALI?

DALI (Digital Addressable Lighting Interface) is the new standard of the multi-functional interface for the digital control of electronic rheostats (EGG). Its function is to manage the systems and the devices according to a digital signal that may individually manage up to 64 modules on the same bus-bar.

Such protocol represents a controlled light system, a network including a controller and one or more lighting devices, such as variators or electrical resistances having DALI interfaces. DALI digital components should have the following main features: digital addressability, digital processing and digital communication.

Therefore, DALI is designed to comfortably manage the light and involved components in a simple way. It is the future of light technology, a smart system energized efficiently and instantly only when it is required.

How does it operate?

DALI architecture is based on a master-slave principle. The user administrates the system with the controller (master) that sends messages to all EGGs (slaves). 64 EGG may connect to this network per each master, as all lights have parallel connections, therefore no engineering components are required.

With the support of bidirectional communication, the controller may monitor the light devices, each having a unique static address within the digital range of 0-63. Also, a feed-back facility controls the status of the electronic actuator (on/off bulb, brightness value, burned out bulbs).

DALI wiring cables are pulled beside the network or through a multi-wire cable that also includes the power supply. DALI has a diode bridge in the interface circuits, so the lighting devices may be connected without considering the polarity. The central interface has a maximum power of 250 mA, and the signal interface has no terminal resistance, being galvanically separated. Also, the control of the lighting devices is achieved both by wires and wireless.