- DALI – Digital Addressable Lighting Interface, is a trademark of DiiA (DALI Alliance), a IEEE (Industry Standards and Technology Organization, Inc) for network-based systems that control lighting in building automation.
- DALI is specified by technical standards IEC 62386 and IEC 60929.
- A DALI network consists of a controller, a power supply and one or more slave devices.
- Each device is assigned a unique short address in the numeric range 0 to 63.
- DALI gateways can be used to implement systems that have upto 64 devices.
Data is transferred between controller and devices over a two-wire bus, with a fixed data transfer rate of 1200 bit/s.
- The bus is used for both signal and power. A power supply provides ≤ 250 mA at 16 V DC; each device may draw up to 2 mA.
DALI 2 Introduction
- DALI-2 is the updated and improved version of the DALI lighting protocol, which includes more features and more product types and has a strong focus on product interoperability.
- Specifically, DALI-2 refers to version 2 of IEC 62386, the international DALI standard. DALI-2 extends and enhances the strengths of DALI as a dedicated, standardised protocol for digital lighting control.
- DALI-2 brings standardisation to system components such as sensors and other input devices, as well as application controllers, which are the ‘brains’ of a DALI system.
- Which are intended to ensure that products from different suppliers are able to work together.
- Compared with the original DALI version 1 standard, DALI-2 includes clearer specifications for control gear features such as timing, fading, power-on and start-up, as well as new features such as extended fade times.
- DALI-2 is designed for backwards compatibility, so DALI-2 control gear can be used in older systems.
- DALI-2 certification brings the promise of significantly improved multi-vendor interoperability compared with the current DALI (version-1) systems in the market.
- Testing procedures for DALI-2 are much more detailed and comprehensive than for DALI version-1, and will be further improved if new issues are identified.
- DALI-2 includes control devices for the first time
- Control devices were not included in version 1 of the DALI standard, meaning it is not possible for control devices to carry the DALI version-1 logo. Only certified products can carry the DALI-2 logo.
- Benefits of DALI-2 for control devices:
- Application controllers and Input devices defined
- Single-masters and multi-masters allowed
- Event priorities defined
- Separate addressing & grouping from control gear.