At present, lighting equipment generally adopts traditional timing control and manual control. These control modes are simple in function, complicated in wiring, and poor in expandability. With the ever-changing application, the application situation is gradually complicated and colorful. The simple control can not complete the required control. Therefore, the lighting control should be developed and changed to meet the needs of practical applications.
Intelligent control system technology protocol diversification standards are difficult to achieve
Today, computer technology, computer network technology, various new bus technologies and automation technologies have been fully developed, making intelligent control of lighting possible. The intelligent control of lighting can automatically collect various information in the lighting system according to environmental changes, objective requirements, and user's predetermined requirements, and perform corresponding feedback control of working state information to achieve the desired control effect. However, for intelligent control systems to control different lighting fixtures, it is necessary to base on a communication protocol between devices.
DALI protocol
DALI, as part of the IEC929 standard, provides communication rules for lighting equipment. It came out in the mid-1990s, and commercial applications began in 1998. In Europe, DALI has been accepted as a new standard by ballast manufacturers. When formulating standards, the DALI protocol clearly defines not the development of the most functional and complex building control system, but the establishment of a well-structured ballast-specific lighting system. Therefore, DALI's specialty is not used to build complex bus systems, but for indoor intelligent lighting control.
The DALI protocol is an asynchronous serial communication protocol. The digital signal is compiled by Manchester. Compared with the traditional analog technology controlled dimming, the DALI-based digital control dimming technology features:
1, dimming is addressable, bringing a lot of flexibility to control
2, dimming anti-interference ability, wide range of dimming
3, dimming installation is simple, dimming power supply can quickly install wiring.
EIB agreement
The EIB protocol is a control-oriented network communication protocol. The purpose of communication is to realize the interaction between the sensor and the actuator, starting with the exchange of the defined data structure and ending with the functional application. Its European-based building automation (BA) and home automation (HA) standards have been adopted by the Consumer Electronics Manufacturers Association (CENA) as the home network EIA-776 standard.
It is used in all branches of the home building sector such as lighting, security, HVAC, and time event management. It is characterized by distribution, interoperability, flexibility and openness. Recent developments have shown that the EIB protocol is increasingly being applied to intelligent lighting systems.
KNX protocol
In May 1999, the three major bus protocols EIB, BatiBus and EHSA in Europe merged to form the Konnex Association and proposed the KNX protocol. The KNX protocol is based on EIB, taking into account the physical layer specifications of BatiBus and EHS, and absorbing the advantages of BatiBus and EHS distribution modes, providing a complete solution for home and building automation.
The KNX-based system can connect all the components through a bus, each component can work independently, and at the same time, it can be centrally monitored and controlled by the central control computer. The components programmed by the computer can perform tasks such as switching, control, monitoring, etc. independently, and can be combined according to requirements, so that the function can be flexibly changed without increasing the number of components.
C-Bus protocol
The C-Bus Lighting Management System is an intelligent, programmable lighting management system developed by Gerard Industries Dty Ltd in Australia in the early 1990s. Each component in the system has a built-in microprocessor to transmit, identify and memorize information in the form of data signals, and through a pair of unshielded twisted pair (UTP) as a bus architecture, the units of the system can work together to each other. External lighting and other facilities are controlled.
C-Bus is a two-wire lighting system that uses five types of cables to connect all components into a network. Various complex functions are set by 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 flexibly connected. For example, network bridges, hubs, and switches are used. The number of network segments is not limited. It adopts a free topology and can be designed into a topological structure such as a line, a tree or a star. The networking is very convenient.
DMX512 protocol
DMX512 is a multi-channel digital transmission. It is a digital multiplex protocol developed by the American Theater Technology Association. It is a dimming protocol used between transmitters and dimming equipment. It is a universal signal control for digital equipment in the lighting industry. protocol. It stipulates that the interconnection mode between the host and the slave adopts a bus-type network structure, which is a typical master-slave mode.
At present, various stage lighting equipment, such as computer lights, dimming controllers, consoles, color changers, electric booms, etc., have fully supported the DMX512 protocol and fully realize dimming control. Digital, and on this basis, gradually become computerized and networked.
Lighting control systems are an important means of intelligent lighting and energy saving. With the rapid development of the building automation and lighting industry, the use of advanced energy-saving design and digital control will be an inevitable choice. At present, due to different development backgrounds and functional characteristics, there are many intelligent lighting communication protocols on the market. These protocols have their own advantages in their respective fields, each occupying a certain market share, so it is difficult to unify to a standard.
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