DALI employs a digital transmission signal which makes it less prone to the transmission errors that typically affect analogue control signals. Unlike the older 1-10v analogue systems or the propriety DSI systems the DALI signal allows for Bi-Directional Communication which creates the ability to obtain functionality results directly from the DALI device.
Below you can see DALI devices, these can be ballasts, transformers, LED controllers or emergency devices compatible with DALI. Up to 64 DALI devices can be connected to a line. Sensors, switches, groups or scene controllers can be connected anywhere on the DALI line. These are optional devices. A DALI power supply is required for every DALI loop and a DALI controller, or gateway, allows control of a DALI line. The DALI protocol allows for multiple controllers per DALI loop. Also these devices are optional.
HINT: Mains Power refers to the active neutral and earth wires.
DALI wiring refers to the two cables used for the DALI signal. These wires are 240V rated and can be run next to the mains power cables
Each DALI device has its own address which enables individual communication and control over a single DALI line. This means that you can wire up to 64 DALI devices together and control them separately, whereas traditionally you would need to wire each device separately. Individual control provides the means to gain the maximum power savings and comfort.
HINT: Think of a command as a letter sent via the post. Only the person it is addressed to will open and read the letter.
Individual control is exploited through a broad range of queries/commands, listed below. The feedback from the device provides the perfect method for minimizing maintenance costs of the building while ensuring a safe working environment.
Because of the localised intelligence within each DALI device, it becomes possible to turn the DALI device on or off directly from the DALI control system rather than using a mains switch. This brings greater functionality and allows for flexibility and change after installation.
Moreover, changes can be made to scenes and functions through simple programming without the addition of any new hardware.
DALI devices have a number of features that can be changed to adjust the operation of the device, per example:
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