What are the requirements of the intelligent lighting control technology agreement
At present, two methods of traditional punctual control and manual control are usually used for lighting equipment. These control methods are simple in function, complicated in wiring and poor in scalability. With the continuous change of the use occasions, the use conditions are gradually complex and colorful, and the required control cannot be achieved by simple switch control, so the required lighting control should also be developed and changed to meet the needs of practical use.
Today, with the full development of computer technology, computer network technology, various new bus technologies and automation technologies, it is possible to intelligently control lighting. The use of intelligent lighting control can actively collect various information in the lighting system according to conditions such as environmental changes, objective requests, and user reservation needs, and perform corresponding feedback control of operating status information to achieve the expected control effect. However, if the intelligent control system wants to control different lighting appliances, it needs to be based on a communication protocol between devices.
DALI protocol
As part of the IEC929 specification, DALI provides communication protocols for lighting equipment. It was introduced in the mid-1990s, and commercial use began in 1998. In Europe DALI is now accepted as a new norm by ballast manufacturers. When the DALI protocol was drafting the specification, it was clearly positioned not to develop the most functional and complex building control system, but to establish a special lighting system for ballasts with a clear structure. Therefore, DALI's expertise is not used to build complex bus systems, but for intelligent indoor lighting control.
The DALI protocol is an asynchronous serial communication protocol. The digital signal is edited by Manchester. Compared with the dimming controlled by the traditional analog technology, it is based on the characteristics of DALI's digital control dimming technology:
1. Dimming is addressable, bringing a lot of sensitivity to control
2. The ability of dimming and anti-interference is strong, and the range of dimming is wide.
3. The dimming device is simple, and the dimming power supply can be quickly installed and wired.
EIB Protocol
The EIB protocol is a control-oriented network communication protocol. The purpose of its communication is to realize the interaction between the sensor and the actuator, starting from the communication of the defined data structure, and ending in the functional use. Its Building Automation (BA) and Home Automation (HA) specifications, which dominate Europe, have been adopted by the Consumer Electronics Manufacturers Association of America (CENA) as the home network EIA-776 specification.
It is used in all branches of the home building field such as lighting, security, HVAC, time management, etc. It has the characteristics of dissemination, interoperability, sensitivity and openness. The development of these years shows that the EIB protocol has been increasingly used in intelligent lighting systems.
KNX protocol
In May 1999, the three major European bus protocols EIB, BatiBus and EHSA merged to form the Konnex Association and proposed the KNX protocol. Based on EIB, the KNX protocol integrates the physical layer specifications of BatiBus and EHS, and absorbs the advantages of BatiBus and EHS configuration modes, providing a complete solution for home and building automation.
The system based on the KNX protocol can connect all components through a bus, each component can work independently, and at the same time, it can be supervised and controlled collectively through the central control computer. Each component programmed by the computer can independently perform operations such as switching, control, monitoring, etc., and can be combined in different ways according to requirements, and then achieve the effect of flexibly changing the function without increasing the number of components.
C-Bus Protocol
C-Bus lighting management system is an intelligent and programmable lighting management system developed by Gerard Industries Dty Ltd in Australia in the early 1990s. Each element in the system has a built-in microprocessor, which transmits, identifies and recalls information by means of data signals, and uses a pair of unshielded twisted pair (UTP) as the bus system structure to enable each unit of the system to communicate with each other. The interior and exterior lighting and other equipment are controlled.
C-Bus is a two-wire lighting system. It uses five types of wires to connect all components into a network. Various complex functions are set through software. The protocol on the system bus is CSMA/CD, and each network segment can be connected to 100 units. , the network segments can be connected flexibly, such as the use of network bridges, hubs, switches, etc., the number of network segments is not limited. It adopts a free topology structure, which can be planned into linear, tree, star and other topology structures, and the networking is very convenient.
DMX512 protocol
DMX512 is multi-channel digital transmission. It is a digital multiplexing protocol developed by the American Theater Technology Association. It is a dimming protocol between the transmitter and the dimming device. protocol. The interconnection method of the regular host and the sub-machine adopts a bus-type network structure, which is a typical one-master and multiple-slave method.
At present, various stage lighting equipment including computer lights, dimming controllers, consoles, color changers, electric booms and other stage lighting equipment have fully supported the DMX512 protocol, and all completed the dimming control. Digitization, and on this basis, gradually tend to be computerized and networked.
The lighting control system is an important means of lighting intelligence and energy saving. With the rapid development of building automation and lighting industry, the use of advanced energy-saving design and digital control for lighting will be an inevitable choice. At present, due to different development backgrounds and functional characteristics, the intelligent lighting communication protocols on the market are complicated. These protocols have their own advantages in their respective fields, and each occupies a certain market share, so it is difficult to agree to a standard.
