DALI stands for Digital Addressable Lighting Interface. It is a lighting control protocol that allows luminaires, drivers and control devices to communicate over a dedicated two-wire network.

DALI is commonly used in commercial and architectural lighting systems where individual control, grouping, dimming and scene setting are required.

How DALI Works

A DALI system uses a controller and one or more lighting devices connected through a DALI interface. The controller communicates with each device using bidirectional data exchange, which means it can both send commands and receive status information.

This allows the system to:

• Switch lights on and off
• Dim individual luminaires
• Create lighting groups
• Store and recall lighting scenes
• Monitor device status and faults

DALI Addressing

Each DALI device can be assigned a unique address from 0 to 63. This allows up to 64 individually addressable devices on a single DALI line.

Devices can also be controlled using:

• Individual addresses
• Group commands
• Scene commands
• Broadcast commands

For larger installations, DALI can be expanded using gateways or multiple DALI lines.

DALI Wiring and Network Layout

DALI uses a simple two-wire communication bus. This reduces wiring complexity because all devices on one DALI line can share the same communication pair.

DALI wiring can be arranged as:

• Bus topology
• Star topology
• A combination of both

DALI is not polarity sensitive, which simplifies installation and commissioning.

DALI Communication

DALI uses an asynchronous, half-duplex serial protocol with a data rate of 1200 bits per second. Communication is transmitted over the two-wire bus using Manchester encoding, which helps improve reliability in electrically noisy environments.

Because of its robust communication method, DALI is well suited to commercial and industrial lighting installations.

DALI and SELV

A DALI system is not classified as SELV. This means DALI control wiring may be installed alongside mains-rated wiring where appropriate regulations and installation practices are followed.

DALI cabling should be suitably rated for the installation environment.

DALI Signal Levels

DALI signal levels are typically defined as:

• Around 0V for a digital “0”
• Around 16V for a digital “1”

The interface is isolated and does not require termination resistors, which simplifies system design.

Why DALI Is Used

DALI is used because it provides flexible, intelligent lighting control. Key benefits include:

• Individual luminaire control
• Group and scene control
• Two-way communication
• Fault monitoring
• Flexible wiring options
• Easier reconfiguration than traditional switched circuits

This makes it valuable in offices, retail spaces, schools, hospitals and commercial buildings.

DALI vs Traditional Lighting Control

Traditional lighting systems often rely on fixed switching circuits. DALI is more flexible because lighting behaviour can be changed through programming rather than rewiring.

For example:

• A luminaire can be reassigned to a different group
• Scenes can be adjusted after installation
• Faults can be monitored through the control system

This reduces long-term maintenance and reconfiguration costs.

People Also Ask

What does DALI stand for?

DALI stands for Digital Addressable Lighting Interface, a protocol used for intelligent lighting control.

How many devices can be connected to a DALI system?

A single DALI line can support up to 64 individually addressable devices.

Is DALI polarity sensitive?

No, DALI wiring is not polarity sensitive, which makes installation simpler.

What is the difference between DALI and 0-10V lighting control?

DALI is digital and bidirectional, while 0-10V is analogue and generally offers simpler one-way dimming control.

Where is DALI lighting used?

DALI is commonly used in commercial buildings, offices, schools, hospitals, retail spaces and architectural lighting systems.