DALI-2 and DT8 Networking Basics: From Wiring to Scene Commissioning
A DALI system consists of a DALI controller, a bus power supply, DALI-capable drivers and luminaires. The bus is two non-polarised signal wires that may share containment with control cabling. Devices are assigned short addresses, then grouped into groups and scenes. For DT8, select the colour-temperature device type on the controller and send brightness and Tc commands separately, decoupling brightness from CCT.
System components and wiring
The DALI bus is two-wire and polarity-free, typically limited to 64 control-gear addresses per line, with bus length and drop calculated to the standard. Compared with 0-10V, DALI needs no separate control cable per circuit and supports status feedback, simplifying maintenance.
Addressing, grouping and scenes
Workflow: 1) the controller scans bus devices; 2) assign unique short addresses, avoiding conflicts; 3) group by space or function; 4) preset scenes and fade times; 5) save the configuration and test power-cycle recovery.
DT8 tunable-white essentials
DT8 (Device Type 8) adds a colour-temperature channel alongside brightness and requires support on both controller and driver. During commissioning, set brightness and Tc separately and confirm brightness does not drift as CCT changes; the usual range is 3000–6500K. HUARON HRJS DALI series supports DT6 / DT8 command sets, and HRS five-in-one series is compatible with DALI DT6 / DT8.
Common fault finding
Reversed polarity normally does not matter (the bus is polarity-free), but bus shorts, unhandled termination, address conflicts and mismatched DT8 support between controller and driver are common issues. Commission one device first, then add segments, and keep a device list and address map.
Commissioning stage checklist
| Stage | Key action | Common mistake |
|---|---|---|
| Wiring | Two polarity-free wires, check drop | No segregation from mains cabling |
| Addressing | Scan and assign unique short addresses | Address conflicts between devices |
| Grouping | Group by space / function | Groups do not match physical layout |
| Scenes | Set brightness, CCT and fade time | Mixing DT8 controllers with DT6 drivers |
| Handover | Save configuration, test power recovery | No address map retained |
Frequently asked questions
Does the DALI bus need a separate power supply?
Most DALI controllers or bus power modules supply bus current, and some drivers can draw power from the bus. Check the bus current budget in the device manuals.
Can a DT8 controller operate DT6 drivers?
Usually it can send brightness commands (the DT6 part), but colour-temperature commands have no effect. Tunable-white scenes need DT8 support on both ends.
Can DALI and 0-10V coexist on one project?
Yes. Using five-in-one dimmable drivers across different circuits is a common way to avoid separate stock for legacy loops.
Further reading
- How to Choose Five-in-One Dimming: TRIAC, 0-10V, DALI DT6 and DT8 Compared
- LED Driver IP20 / IP44 / IP50 / IP67: Protection Ratings and Selection Advice
- LED Driver Certifications Explained: CCC, CE, ETL, CB, UKCA and FCC
- How Much Headroom Does an LED Driver Need? Power, Voltage Drop and Derating
- All product series