【 Weak current College 】 Intelligent Home Plug-and-technical specifications

1 HomePnP specification overview
HomePnP standards makers to establish reliable family system technology provides some new ideas, the most important of which is: a public device language; the independence of the transmission protocol; state object, listen to the object and the request object; subsystem of loosely coupled; home mode and State vector; configuration process.


1.1 transfer protocol independence
The independence of the transmission protocol is the most HomePnP specification for one of the main objectives of, the specification by addressing three main function to handle application-tier and higher. Household electrical appliances plug (HomePnP) uses a hierarchical structure, the lowest representative application layer and its related public application language (CAL), which is included in the standard EIA-600 (CEBus), it can be waived in different product between expensive language translation gateway. Context data structure layer represents a wide range of development with CAL syntax into the product model. By defining security, lighting, environment, energy management, public facilities, computers and entertainment applications of functional product parts, components to industry appliances models. At the top are system guide, it pointed out that the plug and play installation of the product must have what behavior characteristics. These guiding principles relating to the previously unresolved problems. HomePnP specification so that manufacturers can use an application protocol, and select the appropriate independent transmission network (PL, RF, IR). Application layer from the following transport layer to get some of the services. Because HomePnP intends to run on existing consumer electronics protocol such as CEBus and IEEE1394 (FireWire), so it's only after transport layer below the proposed minimum requirements.


1.2 status, listen to and request objects
In the application public EIA-600 language (CAL) provides three standardized object type — the State object, listen to the object and request objects. HomePnP officially establishes the State, to listen to and request objects. For example, in a contained conditioner, electric water heater system of intelligent home system, the request object cause device changes state, then the State object published status change, all of the work of listening object can tune in to this state information. These three objects constitute various subsystems through loosely coupled interoperability.


1.3 subsystem of loose coupling
Loose coupling is a feature of HomePnP. Smart family HomePnP structure using subsystem loosely coupled, new ideas, the complexity of the equipment by natural form hierarchies. In a loosely coupled way, subsystem can assure all other HomePnP subsystem reports status information and allows manufacturers to design products without having to learn more about other manufacturers ' products. For example, we can design a security system: If the window is opened air conditioner is started, the security system will issue a warning. A loosely coupled way security system with just a right to object, to listen to the information from the environment monitoring, in accordance with the contract from the air conditioner. Security system depending on your design decisions to use or do not use this information. The request object also can be caused by network status changes.


1.4 home mode and State vector
State vector from the beginning, it home mode reflects user to home set work objectives, shared by the various subsystems. These vector information is more information from the subsystem extracted, take hierarchical structure. Home mode to define the first element is the State, the State can be a person, no person or uncertain; the second element is the probability that the optional certainly or probably; the remaining elements of the home state of the change request, and gradually make ideal home in depth work status of detailed requirements. Home mode in the hierarchy of practicality, listening devices to vector analysis, and in accordance with their own understanding of action. But lighting subsystems may only under some State or State control over some of the lights, and another subsystem may use the above all vector control.


1.5 configuration process
HomePnP for Advanced Intelligent Home system opens up development path, but does not require consumers to one step, consumers will still be available from the system start, gradually increasing and extending their systems. Configuration process can be divided into three stages. First is the use of two of the most common medium power line carrier and RF configuration device basic communication capability, it should be noted that required the use of special handshake steps to avoid various interactions. The second stage is to make a device equipped with a state object, which requires network to each State of the object is assigned a unique identification number. The third stage is equipped with a device to listen to the object requesting matching state object that is called automatically. HomePnP


1.6 other research topics
A study on the subject of other HomePnP are: product groupings, including geography, scenario and other groups; scheduling, a better use of network products one approach is to arrange the time of the event. HomePnP will provide detailed data structure and edit methods; lock, HomePnP will provide a tool for some action and lock a device, in whole or in part; security and privacy, the application might require multiple levels of security measures, it is necessary to provide the required protection, and not too complicated; the user interface, HomePnP will provide the context for the user interface and the object to ensure that can be used with other HomePnP device interoperability.