NFC Tag Module for DALI LED Drivers: Wireless Configuration Without Power-Up

DALI has become the default control interface for commercial lighting, and it is the only globally standardised digital lighting protocol. It also carries a commissioning problem that has never really been solved: setting up a DALI driver is specialist work, and the traditional alternative — a DIP switch for output current — has to be set by hand, offers only a coarse range with uneven dimming, and sits non-isolated against the mains side of the driver, which is both a shock hazard and an extra cost item on every unit. YQM ELECTRONICS supplies an NFC dynamic tag module that moves the whole configuration step onto a contactless interface: a phone or an NFC programmer sets output current, constant lumen output (CLO) and NTC over-temperature protection wirelessly, and the driver can be configured before it is ever connected to mains power.

1. Application Scenario: Replacing DIP Switches in DALI Drivers

DALI drivers are spreading through commercial, industrial and outdoor lighting, and with them the burden of commissioning. The wired DALI bus addresses and configures the installation, but the per-driver parameters — drive current, CLO behaviour, thermal limits — are still set locally, and the legacy mechanism is a DIP switch block. That mechanism fails in three ways at once: it demands manual intervention at every unit, its dimming range and curve smoothness are limited by the discrete switch positions, and because the switch block is not isolated from the AC side, adjusting it means working near live mains. Adding it also raises the bill of materials on every driver shipped. Three points in the lifecycle gain the most from replacing it:

• Production and packing: because the tag is powered by the programmer's field rather than by the driver, a unit can be parameterised on the bench or in the box before it is ever energised.
• On-site commissioning: the luminaire can stay installed and de-energised while settings are written, so commissioning does not require opening a live fixture.
• Field reconfiguration and after-sales: changing a drive current or a thermal limit later needs no rewiring and no mains access — which is also what protects the parameters a manufacturer sets at the factory.

2. Solution Features

• Configure without power-up: the tag harvests its energy from the reader field, so parameters can be written with no supply connected to the driver.
• Industrial-grade and compact: the module is built for the driver's operating environment and sized to fit inside existing housings.
• Lower installation cost: commissioning a lighting project stops being a specialist on-site job, which cuts both labour and rework.
• Low-cost architecture: the module replaces the DIP switch block and its associated handling, reducing cost per driver rather than adding to it.
• DALI and NFC in one driver: the wired DALI interface is retained unchanged, so the same unit drops into existing installations and retrofits, with a simple and reliable communication structure.

3. Solution Architecture

The system has two sides that never touch electrically. On the configuration side sit the two writers a customer can choose between — PC software driving an NFC programmer, or a phone app — and both reach the driver over the same contactless channel. Inside the driver sits the NFC dynamic tag module, permanently embedded and wired to the driver's control stage. On the installation side, the DALI master reaches the driver over the ordinary wired DALI bus, exactly as it would with any other driver.

Figure 1: System architecture. A PC with an NFC programmer or a phone app writes parameters over the NFC channel into the tag module embedded in the DALI driver; the DALI master continues to reach the driver over the standard wired bus.

Because both writers present the same tag interface, the phone app and the PC tool can expose the same parameter set. A typical app screen covers the DALI communication status, measured DALI current and voltage, the configuration time window, automatic parameter saving, factory-state and factory-parameter setting, and a restore-to-factory-default action — enough for a service technician to read the driver's live state and rewrite it in one visit.

4. Core Technical Principles

The configuration channel is ordinary NFC, standardised as ISO/IEC 14443 and operating at 13.56 MHz. The tag module is passive: it has no battery and no connection to the driver's supply rail, drawing its operating power inductively from the field the phone or programmer radiates. That single property is what makes the 'no power-up' claim literally true rather than a convenience feature — with no mains connected, there is simply nothing to energise, so there is nothing to isolate and no live-side adjustment to make.

Figure 2: The NFC dynamic tag module. The printed coil couples to the phone or programmer field, while the contact pads connect the tag's memory to the driver's control stage.

The configuration itself is a memory write. Parameters such as output current, CLO level, PWM and dimming values, and the NTC thermal cut-off are written into the tag's memory by the programmer, and the driver's microcontroller reads them back and applies them to the constant-current stage. Because the write path is contactless, it is also galvanically isolated from the mains side — which removes the shock exposure that a non-isolated DIP switch block carries. Memory lock bits and write passwords can be applied to the parameter area, so a driver can be locked to its factory or OEM values and later re-opened only by an authorised programmer.

5. Services & Support

• Application scenario planning: YQM identifies the industry pain point, draws out the requirement, and matches it against the available technology.
• Solution delivery: a concrete solution is produced against the customer's requirement and actual operating environment.
• Project assessment: theoretical and simulation-based evaluation against the deployment conditions and specification targets.
• Technical team support: R&D and FAE engineers provide guidance, on-site analysis and project follow-through.
• Product design support: substitution with mature designs, custom development, and high-efficiency RF design.
• Reporting: site environment analysis reports, improvement recommendation reports and commissioning test reports.

6. Cooperation Model & Expandable Products

YQM supports both ends of the configuration chain, so a driver manufacturer can take the module alone or the complete programming toolchain with it.

The same module suits more than DALI drivers. Any power supply or control gear whose parameters are currently set by hand — 0-10V and PWM dimming drivers, emergency lighting units, sensor and relay modules, and LED driver platforms generally — can carry an NFC tag module instead of a switch block, and gain contactless, power-free configuration in the process.

7. Product Showcase

A DALI constant-current LED power supply of the class this module is designed into. Units in this family already carry an NFC variant, marked on the label, which confirms both the mechanical fit and that NFC configuration has become a recognised feature tier in commercial lighting drivers rather than a niche add-on.

Figure 3: A DALI constant-current LED power supply of the target class. The NFC variant carries the programmable tag module inside the same housing footprint. (Terminal product image source: network; contact for removal if copyright concern.)

Conclusion: NFC Configuration — Taking DALI Drivers Off the DIP Switch

An NFC dynamic tag module turns a DALI driver's most awkward step into its easiest one. Parameters are written from a phone or a PC programmer instead of a screwdriver, they can be written before the driver is ever powered, and the adjustment happens across an air gap rather than next to live mains — so the shock exposure inherent in a non-isolated DIP switch block simply does not exist. At the same time the driver keeps its DALI interface unchanged, which means the change is additive for a manufacturer's existing platform: same firmware architecture, same certifications scope, lower handling cost, and a parameter set that can be locked to protect OEM settings. YQM ELECTRONICS supplies the tag module, the antenna design and — if required — the programmer and companion app, so a driver manufacturer can adopt contactless configuration end to end.

Explore YQM ELECTRONICS' complete custom module solutions to add NFC configuration to your driver platform. Our engineering team covers the full path — tag module definition, antenna design, firmware interface and volume manufacturing.

Further reading: Explore the complete custom module solutions or reach out to our engineering team to discuss your specific NFC configuration requirements.