Digital Addressable Lighting Interface
| International standard | IEC 60929 and IEC 62386 |
|---|---|
| Developed by | Activity Group DALI |
| Introduced | Early 1990s |
| Industry | lighting |
| Type | lighting control | ||
|---|---|---|---|
| Superseded | 0-10 V lighting control | ||
| Hot pluggable | Yes | ||
| External | Yes | ||
| Cable | mains-rated, with 600 V isolation, separate or part of power cable | ||
| Pins | 2 | ||
| Connector | 1 | ||
| Signal | 16V DC | ||
| Max. voltage | 22V DC | ||
| Max. current | 250mA | ||
| Width | 30bit/s | ||
| Bitrate | 1200bit/s | ||
| Protocol | asynchronous, half-duplex, serial protocol over a two-wire bus | ||
| Pin 1 | +DALI bus | ||
| Pin 2 | -DALI bus | ||
Digital Addressable Lighting Interface (DALI) is a trademark for network-based systems that control lighting in building automation. The underlying technology was established by a consortium of lighting equipment manufacturers as a successor for 0-10 V lighting control systems, and as an open standard alternative to Digital Signal Interface (DSI), on which it is based.
DALI is specified by technical standards IEC 62386 and IEC 60929. Standards conformance ensures that equipment from different manufacturers will interoperate. The DALI trademark is allowed on devices that comply with the current standards when manufactured. Members of the AG DALI (founded by Philips lighting in 1984) are freely allowed to use the DALI trademark; non-members can apply for a fee-bearing license.
A DALI network consists of a controller and one or more slave devices (e.g., electrical ballasts, LED drivers and dimmers) that have DALI interfaces. The controller can monitor and control 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 multicast and broadcast messages.
Each device is assigned a unique static address in the numeric range 0 to 63, making possible up to 64 devices in a basic system. Addresses may be arbitrarily assigned and devices need not be mapped to contiguous addresses (gaps may exist in the address map). DALI gateways can be used to implement systems that have more than 64 devices. Data is transferred between controller and devices by means of an asynchronous, half-duplex, serial protocol over a two-wire bus, with a fixed data transfer rate of 1200 bit/s.
A single pair of wires comprise the bus used for communication to all devices on a DALI network. The network can be arranged in a bus or star topology, or a combination of these. DALI is not classified as SELV (Separated Extra Low Voltage) and therefore its wiring may be run next to mains cables or within a multi-core cable that includes mains power. Data is transmitted using manchester encoding and has a high signal to noise ratio which enables reliable communications in the presence of significant electrical noise.
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