DALI gateways and addressing strategy

DALI (Digital Addressable Lighting Interface) is the lighting world's equivalent of KNX: a two-wire bus with up to 64 short addresses per line, dimmable, broadcastable, with status feedback. A KNX-DALI gateway connects one or more DALI lines to KNX, exposing each fixture or group as a KNX object.

Decide on the addressing strategy before you commission. Three common approaches: per-fixture (one DALI short address per fixture, KNX groups composed in the gateway), per-circuit (DALI broadcast on each circuit, no individual addressing), and hybrid (most fixtures broadcast, a few critical ones individually addressed). Per-fixture gives the most flexibility but requires the most cabling discipline. Hybrid is the sweet spot for most projects.

DALI-2 (the IEC 62386 second edition) brings backwards compatibility plus useful new features: standardized emergency lighting (Type 1), absolute dim values in lux, and richer status reporting. If the project has a chance of needing emergency lighting reporting later, choose DALI-2 fixtures from the start. Retrofitting later costs more than the original budget gap.

Groups and scenes live inside the gateway. A KNX scene actuator can trigger a DALI scene by writing a scene number to a single group address; the gateway then dispatches DALI scene commands to the fixtures. This keeps the bus traffic minimal even when controlling 200 fixtures simultaneously.

When you commission, address the DALI fixtures first using the gateway's addressing tool, then map them to KNX groups inside ETS. Reverse this order and you will spend an evening untangling a mess. Document the DALI short address of every fixture on a single floor plan; this drawing is what every future engineer will need.