Smart Home Core Technology "Bus Technology"

From the trajectory of the development of smart homes, the earliest products generally use RS-485 technology, which is a serial communication standard, because it is only the specified physical layer electrical connection specification, each company defines the product's communication protocol, so RS-485 products are many, but they cannot communicate directly with each other. RS-485 generally requires a main contact point. The polling mode is adopted for communication. The connection mode between the modules is “hands- in-hand”. Therefore, the communication speed is not high (normally 9.6 Kbit/s), and the number of modules is limited. The stability is not high (a module will be broken will cause the system to all) and other issues.

With the development of automatic control and communication technology, fieldbus control system (FCS) technology was born. Its core is the bus protocol, which is generally initiated by a company or organization. Many international companies respond. Specialized organizations develop and maintain this standard. All the disadvantages of the above RS-485 are overcome on the FCS. At present, the world's major Intelligent Building (IB) products commonly use bus protocols such as HoneyWell, Jonhson, SIEMENS, and TAC. At present, there are more than 20 kinds of bus protocols that are popular in the world, and the most influential ones are LonWorks, EIB, CAN, and BACNet.

The fieldbus refers to the measurement and control equipment in the factory. It is said that Du has a 1st day/J Tuogang yu9, also known as a field network. This is a network that specializes in communications between controllers, various operator terminals and controllers, and controllers. The main wiring between these devices is ON/OFF, contact signals, and analog signals. By digitizing the communication, time division, multiplexing, and multipointing are possible, enabling high performance, high reliability, and easy maintenance. Save wiring (wiring sharing).