The world's first intelligent building "City Square" was built in Connecticut in January 1984, and the lighting system control is based on Distributed Control System (DCS) technology. At present, the domestic C-Bus sensor unit: single / dual / four-button switch, scene switch, infrared remote sensing / sensor, brightness sensor. Actuator units for C-Bus: single/dual/four/12-way switching outputs, four/eight-way dimmers. (-Bus's operating software is (-Gate. Dynet is Dynalite's closed control bus protocol for lighting systems. The Dynalite system uses a 4-wire twisted pair of four wires, that is, a pair of twisted pairs to provide DC12V bus device operating power. Another pair of twisted pairs is used to transmit bus device information. It is recommended to use Category 5 (four pairs of twisted pair) as the transmission medium during installation. The unused line can be used as a backup. Dynet is based on RS485 four-wire system. The transmission protocol only supports the linear network topology. The main network can connect 64 subnets through the bridge. Each subnet can connect 64 bus device units (nodes). As shown, the subnet transmission rate is 9.6Kb/s. The main network can reach up to 57.6Kb/s. Dynet's corresponding operating software is Dlight. Dynet's products are similar to C-Bus. The more distinctive ones are dimming actuators, which can be used for various existing light sources (incandescent lamps, fluorescent lamps, Energy-saving lamps, mercury lamps, etc. are dimmed, suitable for applications where the requirements of the light source environment are complex and varied. The C-Bus and Dynet lighting control systems have not seen the data supported by other manufacturers. The closed system has slow technological progress. 3 Lighting System Open Control Bus Protocol 3.1 European Installation Bus is the dominant building/home automation standard in Europe. As of June 2002, there are more than 3 (1) manufacturers in the world producing more than 5,000 EIB-compatible products, accounting for 80% of total sales of home automation equipment in Europe. The EIB agreement is managed by a neutral, non-profit organization EIBA, and any willing to comply Manufacturers of the EIB Agreement can apply for and pass the EIB certification to produce EIB products. In 1999, EIB entered China. Currently, EIB has two training centers in China and more than 30 agent integrators. Xiamen International Convention and Exhibition Center, Dalian International Trade Center, Shanghai New International Expo Center and Zhejiang Great Hall of the People are all successful applications of EIB. In view of its excellent performance, the agreement has been listed as the EIA~766 standard by the Consumer Electronics Manufacturers Association (CEMA). The EIB protocol allows for a variety of media, such as twisted pair, power line, RF, IR, etc. This article is limited to the most widely used twisted pair. The EIB follows the ISO/OSI seven-layer protocol specification and is reasonably simplified, with the session layer and presentation layer incorporated into the application layer. EIB is a distributed peer-to-peer (Peertopeer) distributed network. Each device in the access network has the same status, and the system scales from 3 nodes to 65,025 nodes. EIB's transmission protocol is CSMA/CA. The communication rate is 9.6Kb/s. The operating software is ETS. EIB products are installed in three ways: actuators are installed centrally with standard rails; sensor products are installed on-site with type 86 panels; The dimming device and the louver transmission are embedded in the electrical equipment. A wide range of well-equipped EIB products not only provide C-Bus and Dynet bus products, but also provide application modules such as electric curtains, air conditioners and other electric actuators for energy, lighting, security, communications and buildings. management. Therefore, the EIB system covers some of the functions of the Building Automation System (BAS). There are two addressing modes in the EIB communication network, physical address (PhysicalAddress) and group address (GroupAddress). The physical address is the only indication of the EIB bus communication unit. The physical address consists of 2 bytes and is expressed in decimal format as follows: XX.XX.XXX, whose maximum value is 15.15.255. The different segments in the physical address represent the domains, lines, and devices in the EIB network topology. Group addresses play a key role in the EIB communication mechanism. A series of problems such as difficulty in controlling the integration of the system. / But the communication between the D and the Blish devices is mainly realized by the physical address. The group address makes it more convenient to use one control, multiple control one, and scene control, which are often used in home automation. The group address also occupies 2 bytes, the first digit is always 0, and the effective group address is 15 bit. The group address usually has two decimal representations, which are two-segment and three-segment, respectively: M/s and M /m/s. Different segmentation methods are only functional divisions, and there is no difference in the bit data itself. For example, the two-part group address 1/257 and the three-segment 1/1/1 are exactly the same, and the binary representation is 0000100100000001. The group address segment is different from the physical address, and the representation is not the structure of the network topology. It is the logical division of the function of the network device. For example, use the first paragraph to distinguish "switches" And "dimming" two functions, the second segment distinguishes between different lights. Different devices can belong to the same group address. An example is given to illustrate the application of physical addresses and group addresses. The EIB network shown in the figure contains a domain zone1 and two lines line1, line2. There are 6 devices on the bus, three buttons, two dual-value outputs, and one dimming driver. You can see that the physical address of the bus device corresponds to the domain and line location it is in. There are two group addresses on the bus: 1/1 and 2/ 1 indicate the switch function and dimming function, respectively. The buttons s1, s2 and the dimming driver d1 have the same group address, and the respective control of s1, s2 and d1 can be realized. The button s3, the dual-valued outputs b1, b2 have the same group address, and it is possible to simultaneously control b1 and b2 by s3. The setting of the group address is only related to the functional purpose of the bus device, regardless of the position of the device in the bus. 3.2 Digital Addressable Dimming Interface Standard, supported by major international chips, lamps, ballasts and fixture manufacturers. In 1999, Philips made further improvements to the DALI protocol and launched it at the Hannover International Light Show. A series of products based on DALI. When DALI defines standards, it aims to establish lighting management, realize on/off, dimming, scene, and status display functions. The controlled objects are clearly defined as ballasts, and the bus structure is as shown. DALI adopts master-slave two-wire differential half-duplex bidirectional transmission, the communication rate is 1.2Kb/s. The working voltage is 16V, the line voltage is high level at 9.522.5V, and the low level is -6.56.5V. The data packet consists of 19 bits: 1 start bit, 8 bit address, 8 bits of instruction, 2 bits stop; dimming from 100% to 0.1% (the lowest dimming level in practice is set to 3%) In order to ensure that the lamp life will not be reduced, 255 brightness levels are provided in a logarithmic relationship; each DALI bus can be connected to 64 device nodes, and the nodes can also be assigned to a certain group and have corresponding Group address, up to 16 groups are allowed. A typical DALI protocol digital dimming ballast consists of two parts: a fluorescent dimming module and a DALI communication control module. Most of the fluorescent lamp dimming modules use special ICs produced by Power Semiconductor International Rectifier Co., Ltd., such as IR2156, IR21511, and IR2159. The communication module is selected from Microchip's PIC16F628, PIC16F628 and DALI bus to exchange information, and digital control of the dimming module. In view of the good market prospects of DALI, chip companies have launched their own chips, especially the PSOC launched by CypressMicrosystems. The PSOC is a programmable system-on-a-chip with an embedded microcontroller that simultaneously performs ballast control and DALI communication, greatly simplifying design and production. The 3戛10 and 110 use power line carrier technology and have achieved great commercial success in North America. The protocol product does not require wiring, is easy to use and inexpensive, and is its biggest selling point. See the article for details. HBS is a home network protocol introduced by Japanese companies. In 2001, a well-structured and simple system was used for indoor energy and high-speed blish4n0. Japan's Matsushita company used a two-wire master-slave structure to set the address through the handheld device, which greatly improved the product's ease of use. See the article for details. 4 Conclusion The closed protocol is inconsistent with the trend of technology development. When researching and developing the lighting control system, in principle, some open agreement should be followed. In view of the diversity of requirements, the corresponding open agreement should be selected as needed to meet different needs. From the perspective of pure technology reliability, the master-slave bus structure is obviously not as good as the peer-to-peer (PeertoPeer) structure, but considering the fact that the lighting control network is generally small, and the master-slave requires less hardware and software, The choice of the person should be comprehensively evaluated. Cupro fiber is a kind of regenerate cellulosic fiber, the cross section of which is round without skin core. 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