1HomePnP Specification Overview
HomePnP standard setters provide new ideas for building reliable home system technologies, the most important of which are: common device language; transport protocol independence; state objects, listeners and request objects; loose coupling of subsystems; home mode And state vector; configuration process, etc.
1.1 Independence of Transport Protocols The independence of transport protocols is one of the primary goals of the HomePnP specification, which addresses the application layer and higher layers by addressing three main functions. Home Appliances Plug and Play (HomePnP) uses a layered structure, and the bottom layer represents the application layer and its associated Common Application Language (CAL), which is included in the EIA-600 (CEBus) standard, which eliminates the need for different products. An expensive language translation gateway is set up. The context data structure layer represents a variety of product models developed using the CAL syntax. An industry-recognized model of home appliances that defines functional product components for applications such as security, lighting, environment, energy management, utilities, computers, and entertainment. The top layer is the system guide, which indicates which behavioral characteristics must be available for plug-and-play installed products. These guiding principles involve some of the problems that have not been solved before. The HomePnP specification allows manufacturers to use an application protocol and select the appropriate independent transport network (RF, PL, IR). The application layer expects to get some services from the transport layer below. Since HomePnP is intended to run on existing consumer electronics protocols such as CEBus and IEEE 1394 (Fire Wire), it has only minimal requirements for the following post-transport layer.
1.2 Status, Listening, and Request Objects Three normalized object types—state objects, listeners, and request objects—are defined in the EIA-600 standard Common Application Language (CAL). HomePnP officially specifies the status, listening and request objects. For example, in a smart home system that includes a home air conditioner or an electric water heater system, the request object causes the device to change state, and then the state object announces a change in state, and all working listening objects can listen to the state information. These three objects form the basis for the interoperability of each subsystem through loose coupling.
1.3 Loosely coupled loose coupling of subsystems is a feature of HomePnP. The HomePnP architecture of the smart home adopts new ideas such as loose coupling of subsystems, so that the complexity of the equipment can be layered in a natural form. In the loosely coupled approach, the subsystem can report status information to all other HomePnP subsystems, so that manufacturers do not have to know more about other vendors' products when designing their products. For example, we can design a security system: if the air conditioner is activated when the window is open, the security system will issue an alarm. With loose coupling, the security system only needs to be equipped with a suitable listening object for listening to information from environmental monitoring and receiving reports from the air conditioner as agreed. The security system can decide to use or not use this information according to its own design. The request object can also cause a state change through the network.
1.4 Home Mode and State Vector The state vector begins with the home mode, which reflects the user's work goals set for the home, shared by the various subsystems. The information of these vectors is extracted from the detailed information of the subsystem and adopts a hierarchical structure. The first element to be defined in the home mode is the state, the state can be someone, no one, or uncertain; the second element is the probability, optionally affirmative or possible; the remaining elements are the changing requirements of the home state, and the gradual and in-depth The detailed requirements for the ideal home work status. The hierarchical structure of the home mode is very practical, and the listening device can analyze the vector and take action according to its own understanding. However, the lighting subsystem may only control some lights based on human state or unmanned state, while another subsystem may utilize all of the above vectors for control.
1.5 configuration process
HomePnP opens the way for advanced smart home systems, but does not require consumers to be in place, and consumers can start to grow and expand their systems from small systems. The configuration process can be divided into three phases. The first is to utilize the basic communication capabilities of the two most common media power line carriers and RF configuration equipment. It should be noted that special handshake steps are required to avoid interaction between the various homes. The second stage is to have the device with state objects, which requires the network to assign a unique ID number to each state object. The third stage is to let the device with the listening object request the matching state object, and HomePnP calls it automatic combination.
1.6 Other research topics
Other topics in HomePnP research are: product grouping, including grouping by region, scenario, etc. One way to schedule and better utilize network products is to schedule the time of the event. HomePnP will provide detailed data structure and editing methods for this; locking, HomePnP will provide a tool to lock all or part of a device for certain operations; security and confidentiality, applications may require multiple levels of security The measures need to provide the required protection, not too complicated; user interface, HomePnP will specify the context and objects of the user interface to ensure interoperability with other HomePnP devices. Source of information: China Building Electrical Information Network
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