Standard common communication protocol for vehicle electronic wiring harness

Electronic wiring harness in order to save automotive wiring. In 1968, Essay Cousse Company put forward the idea of using single-line multi-channel transmission signal. In 1971, General Motors of the United States introduced a combined system using a microprocessor; Toyota of Japan also developed a similar device. At the end of the 1980s.

 Compared with traditional vehicle-mounted electronic equipment connection methods, MOST bus has outstanding advantages. MOST technology is not only suitable for vehicle-mounted media information systems, but also for life fields such as smart homes, and has a very broad application prospect. The realization of the video function in the MOST network is similar to the audio function, in which the streaming media information is transmitted in the optical fiber through the control message. In the vehicle media information system, the video function is also very important, so the video function of the MOST network is the focus of the next stage of research.

Due to the rapid development of integrated circuit technology and electronic device manufacturing technology, the great development of automotive electronics technology has been driven. The cheap single-chip microcomputer can be used as the receiving end of the bus. The price of wiring using bus technology has gradually dropped to the stage of practical application. The 850 formulated by the Society of Automotive Engineers is actually a combination of two and a half data bus communication protocols. One is the second-level bus protocol of General Motors, the communication speed on a single-wire bus. The other is Ford's "standard sharing" agreement. The communication speed is on the two-wire bus. Another is Chrysler's agreement, which is similar to GM's. GM and Ford's communication protocols operate in completely different ways. These communication protocols can not only transmit fault scanners, but also control the electronic wiring harness data bus.

The main controller, audio source nodes and audio playback nodes are connected to form a ring network through plastic optical fibers. After the network is connected, the main controller sends instructions to the audio source node, and at the same time monitors the messages transmitted in the network, and analyzes the communication status of the MOST network. The audio source node can respond to the command of the main controller in time, and the sound played by the speaker is smooth, and the communication in the network is in good condition.