The technical standards for network based systems are IEC 60929 and IEC 62386, these systems control lighting in buildings and sometimes automobiles. Established as as successor for the old standard 0-10v lighting controls and as an open alternative to DSI (Digital Signal Interface). The first version IEC 60929 will be withdrawn by 23rd of June 2014. Members of the consortium known as AG DALI are allowed to use the DALI (Digital Addressable Lighting Interface) trademark on devices that are compliant with the current standard.
A DALI interconnected network consists of a lighting controller and one (or more) lighting devices that have DALI interfaces. The controller can monitor and control each light by exchanging data in a directional way, the same as cars crossing up and down a road. The DALI protocol permits devices to be individually addressed and it also incorporates group broadcast or sequence messages, such as;
* “Group 1 goto 100%”
* “Recall scene 1”
Which will allow grouping of devices on the DALI network to dim together or as separate units.
Each lighting device is assigned a unique static address in the numeric range 0 to 63, making possible up to 64 devices in a standalone system. Data is transferred between controller and devices by means of;
* half duplex
* serial protocol
With a fixed data rate of 1200 bit/s
DALI requires a pair of wires to the bus for communication to all devices on a single DALI network. This network can be arranged in a bus or star, or a combination of these. The DALI system is not classified as SELV
DALI systems are great for large buildings, due to being able to control all of the lighting from one controller, DALI is also an amazing cost saving system for saving money on maintenance costs. Should a light fail on the system, this can be viewed from the main controller – instead of maintenance crews having to patrol the full building in a “light sweep”
Our recent project at 77 Queen Victoria Street, incorporates DALI into the design of the lighting, for more information please click here