DALI Logarithmic Dimming Levels

DALI Stands for Digital Addressable Lighting Interface. Standardised digital protocol for lighting control, allowing communication between control devices and LIUs (control gear). is configured to provide dim levels from 0 % to 100 % to DALI units. To ensure that these levels remain consistent industry wide, DALI utilise a logarithmic dimming curve DALI standard logarithmic curve for defining dim levels of DALI units.

The DALI logarithmic dimming curve contains 255 individual 8 bit levels within the 0 % to 100 % range. Each individual level has a value on the dimming curve that relate to the power level of a DALI unit (i.e. DALI ballast). As the level increases, there are higher increments between each dim level. As a result, certain percentiles are omitted from the higher end of the dimming curve.

Thus, when querying DALI levels using Ethernet I/O, the Helvar router In the sense of a lighting system, a router is an intelligent device whose software and hardware perform the tasks of routing and forwarding messages (data) from control devices to the control gear. A router contains two or more subnets. level may return a slightly different level than the level that you have set or can see in Designer (Designer uses all percentiles from 0 % to 100 %). The router has to assign the closest available level value according to the DALI logarithmic curve.

DALI Logarithmic Dimming Curve

Related Topics

• Control Gear Configuration

• Query Command and Reply Descriptions

• Ethernet I/O Overview