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Building Automation and Control Systems
Published in Scott Dunning, Larry S. Katz, Energy Calculations & Problem Solving Sourcebook, 2020
Communications protocols are a set of messages to be sent and received between computers and devices to control equipment, obtain data, and report status. Protocols are fundamentally computer languages that allow devices to operate as a system. BACNet is a protocol standard (see below).Digital Addressable Lighting Interface (DALI) is a control method for building lighting. DALI devices interface with light ballasts through a dedicated cable that is shared among all devices.X10 is a language and protocol that uses a power line carrier (see below) on existing wiring.
Fluorescent Dimming Methods
Published in Craig DiLouie, Lighting Controls Handbook, 2020
The advantages of DALI are that it:Provides true interchangeability across ballasts and controls. Multiple manufacturers can be involved in building an appropriate solution, instead of being tied to a single supplier, using DALI as an open platform. This can result in lower costs, ensures future availability, and enables the system designer to select product functions from one manufacturer and combine them with products from other manufacturers.Provides standardized ballast performance. For example, DALI defines light output for all levels of dimming signals. DALI ensures consistent dimming performance across all dimming ballasts regardless of type or manufacturer, currently not achievable with analog dimming methods such as 0-10VDC.
Natural and augmented lighting
Published in David Thorpe, Passive Solar Architecture Pocket Reference, 2018
Most control systems need additional connectivity. Nowadays, wireless technology is often cheaper to install than wired connections. Digital addressable lighting interfaces (DALI) is one standard used for intelligent lighting management, globally. It is a protocol set out in IEC 60929 and IEC 62386, which are technical standards for network-based systems that control lighting in buildings. A DALI network consists of a controller and one or more lighting devices (e.g. electrical ballasts and dimmers). Each device is assigned a unique static address, allowing it to be remotely controlled. DALI also attempts to reduce the standby parasitic power losses of control equipment.
Flow of Light: Balancing Directionality and CCT in the Office Environment
Published in LEUKOS, 2022
Ellen Kathrine Hansen, Mihkel Pajuste, Emmanouil Xylakis
The spotlights were customized by adding an extended shading of 20 cm to minimize the glare from the work plane, as these fixtures were used in a new, unusual context for task lighting. All of the luminaries were installed on a track-based Digital Addressable Lighting Interface (DALI) system. The DALI control system comprised a charge-coupled device (CCD) central control unit providing three separate DALI lines and a single local memory communication system (LM-Bus line). This control unit ran Zumtobel’s Litecom lighting-management system (LMS). Litecom LMS utilizes the building automation and control network (BACnet) communication protocol; its architecture is representational stated transfer (REST-based), allowing hypertext transfer Protocol (HTTP) requests to and from the CCD.
Lighting System Control Data to Improve Design and Operation: Tunable Lighting System Data from NICU Patient Rooms
Published in LEUKOS, 2023
Andrea Wilkerson, Sarah Safranek, Lia Irvin, Lauri Tredinnick
All aspects of the patient room luminaires were controlled by the LCS with a processor to command and track the lighting modes. The lighting control protocol was a proprietary system, similar to the Digital Addressable Lighting Interface (DALI). A live connection between the processor and the building automation system (BAS) allowed for data to be pulled by the BAS at a chosen interval using the BACnet protocol.