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What are the DALI “device types”?
DT0–DT8, see the figure below for details.

— Data source: DALI Technical Guide
In practical use, how does the master in the system know what type of control gear is on the bus? This is where “device type” comes in as an identifier. Different device types represent different types of control gear and their extended features. Different Part 2xx standards describe the specific requirements for each device type, resulting in a reference table: Part 2xx – Device Type Number.