Abstract: Analyze the smart home network technology from three protocols classified by transmission medium, such as power line carrier, radio frequency, and bus, and focus on the analysis of the power line carrier x10 protocol, PLCBUS protocol, and the two protocols in the smart home network It is considered that the smart home control network based on power line carrier technology has broad development prospects.
The smart home system is safe, convenient, efficient, fast, intelligent and personalized. It uses a variety of communication methods to organically connect various devices in the family. The power line carrier uses the power line as the transmission channel to transmit the signal at high speed through the carrier, which is a communication method that does not require line investment. In the smart home network technology, X10 protocol and PLCBUS protocol based on power line carrier technology are widely used. The author makes a detailed analysis of the advantages of the X10 and PLCBUS protocols and the two protocols in forming a smart home control network.
1 Smart Home Overview
Smart home, or smart home (Smart Home, intelligent home), refers to the use of advanced computer technology, network communication technology, integrated wiring technology, various subsystems related to home life (home various information equipment, automation equipment, Household appliances, security devices, energy equipment, environmental monitoring facilities, etc.) are organically combined through a certain communication technology to form a home intelligent system, which makes home life more comfortable, safe, economical and effective through monitoring, control and management . Compared with ordinary homes, the original passive static structure has been transformed into a tool with active intelligence, providing a full range of information exchange functions to help families maintain smooth information exchange with the outside world. Smart home emphasizes people's subjective initiative, and emphasizes the coordination between people and living environment.
The overall structure of the smart home is divided into three layers: the application layer, the home network layer, and the physical media layer. The application layer includes home automation, network appliances, and information appliances; the home network layer includes control networks, data networks, audio and video networks; the physical media layer is a variety of transmission media, such as: power lines, twisted pairs, optical fibers, telephone lines, wireless .
Home automation includes environmental control, lighting control, security control, energy control, internal monitoring, etc., and is the main content of smart home; network home appliances usually refer to traditional home appliances with increased communication functions; information home appliances are emerging digital home facilities, Such as computers, set-top boxes, game equipment, digital phones, etc. The home network is generally a network that connects the various subsystems of the home together. It is the basis for the communication and cooperation of all parts. It mainly realizes the functions of controlling home automation equipment, data communication, and external connection.
2 The control part of the home network--the core of the smart home
The home network is the basic necessary platform to realize the intelligence and information of the house. The home network is a new technology that connects PCs, home appliances, security systems, lighting systems and wide area networks within the scope of the home (extendable to neighbors and communities). It is to connect all household electrical facilities into a whole network, so that each Household appliances become a member of the whole; according to a certain communication protocol, to achieve control and regulation.
The network should accommodate a series of home appliances and electrical appliances such as security, lighting, environment, energy management, public facilities (water, electricity, gas, etc.), computers and entertainment, with automatic adjustment, resource sharing and other functions.
Technically, the home network has to complete the realization of information links in three aspects. First, it provides broadband information interfaces; second, it provides communication and resource sharing within the home; and third, it provides information links for the home device control network. The first two communications have higher requirements for data traffic and data delay, and the third one has lower requirements for data traffic and data delay. The monitoring and control of home appliances, intelligent security monitoring systems, lighting, energy, residential environments and other systems through the home network can best meet the direct needs of users, not only the direct performance of smart homes, but also the core content of smart homes . The part having the above-mentioned control and monitoring function in the home network may be referred to as the control part of the home network.
3 Application technology of home network control part
The control part of the home network can be divided into two categories: wired and wireless according to the way of physical realization through a variety of media. Wired solutions mainly include: bus system, power line carrier, etc .; wireless solutions mainly include: infrared connection, radio connection, RF technology connection and PC-based wireless connection.
3. 1 centralized wiring technology (bus system)
Separately lay out home network lines and use weak current control lines to realize control and information transmission of home appliances or lights. Previously it was mainly used in building intelligent control. Because of the separate wiring, the signal is the most stable and suitable for large areas such as building and community intelligence The control of the scope is now partly applied to the intelligentization of the villa, but the general installation and installation are more complicated, the cost is higher, the construction period is longer, and it is only suitable for new decoration users.
3. 2 Home Radio Frequency (Home RF) Technology
The use of point-to-point radio frequency technology to control household appliances and lights, installation is more convenient, mainly used to achieve the control of some specific appliances or lights, but the system function is relatively weak, the control method is relatively simple, and is susceptible to surrounding wireless Equipment environment and obstruction interference; Suitable for newly-decorated and renovated households.
3. 3 Power Carrier
Mainly use the existing power lines in the home to transmit control signals to achieve the control and management of home appliances and lights. The installation is relatively simple. Many devices are plug-and-play, you can choose products as you want, and you can continue to be intelligent Upgrade, relatively powerful and practical function, moderate price, more suitable for mass consumption, the technology is very mature, has a history of about 25 years, suitable for newly renovated households and renovated households, it is a healthier, safe and environmentally friendly smart home technology .
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