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Many different components communicate with each other in a lighting network, for example lights and sensors. To simplify bidirectional data exchange, the Digital Illumination Interface Alliance DiiA has defined the D4i standard. It specifies standardised rules for data storage and data access within a DALI-2 network. This facilitates cloud-based monitoring and control of the networked lighting. In addition, the data can be transferred to downstream smart city systems without any further adjustments. However, a closer look reveals that the data records are often not stored in the operating devices.
The D4i standard organises all data in the lighting network into categories and assigns them a specific memory area. Blocks 250 - 253, for example, are reserved for information about LED lighting. The luminaire manufacturer's details are stored in block 251, including luminaire type, serial number, luminous flux, light colour and beam characteristics. Surprisingly, although block 251 must be created for D4i-certified lights, it is by no means always filled with data. One reason is the comparatively high cost. "This information must be collected for each individual luminaire during production and stored in the control gear ," explains Riccardo Wegner, Product Manager Outdoor at TRILUX. However, high data quality pays off in practice.
One advantage of networked lighting systems is the high level of transparency, especially in conjunction with cloud-based monitoring and control systems. If a fault occurs during operation, the corresponding data is saved in block 253 (diagnostics and maintenance) of the light driver, among others. Although the monitoring system recognises a need for action based on the data, it only knows which specific type of luminaire is involved thanks to the information from block 251 (manufacturer's luminaire data). If no data is stored there, the service centre must first research the details at great expense or clarify them on site. "To ensure an efficient maintenance process, block 251 is therefore filled in for all our D4i-certified luminaires," says Riccardo Wegner.
The D4i standard is also an important building block for the future viability of a luminaire. It enables direct communication with smart city systems - without complex interface adaptations. This is why all our network-compatible (SLR) outdoor lights are certified to the D4i standard. In total, this includes many different luminaire families, including Lumega IQ N, Jovie, ConStela 19, Lumena Plus and Publisca P3. Particularly practical: solutions such as the Lumega IQ N are optionally available with up to two Zhaga interfaces. They can also be used to integrate Lichtmanagement and IoT modules into the lighting network at a later date. This means that the Smart City can arrive when it wants - the lighting is perfectly prepared for this.
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