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A detailed introduction to the characteristics of CAN bus

Now industrial production has long been changed from the original production mode of small family workshops to large-scale production. With the increase of the number of production machines and equipment, the requirements of cooperation between machines are also higher and higher. You can't expect every production worker to only be responsible for the immediate equipment, but more attention should be paid to the cooperation between machines. At this time, the industrial bus that is responsible for everyone's unified production, that is, the control and communication system came into being. There were RS232 or RS485 serial bus in the early days, and can bus in the near years. Today, we mainly talk about the characteristics of this can bus.

Can bus is the abbreviation of controller area network (can). It is developed by Bosch Company of Germany, which is famous for R & D and production of automobile electronic products, and finally becomes the international standard (iso1198), which is one of the most widely used Fieldbus in the world. Compared with the traditional serial bus, can bus has the following advantages:
                 Vehicles applying can bus communication
1. The real-time data communication between nodes of CAN bus network is stronger

The controller of CAN bus can work in many ways. Each node on it can send data to the bus through lossless structure bit by bit arbitration according to the priority of bus access (depending on the message identifier). At the same time, the CAN bus protocol abolishes the station address coding and replaces it with the communication data coding, which can make different nodes receive the same data at the same time. These characteristics make the real-time data communication between the nodes of the network composed of CAN bus strong, and it is easy to form redundant structure, improve the reliability and flexibility of the system.

2. The development time of CAN bus is shorter than that of serial bus

Can bus is connected to physical bus through two interfaces canh and canl. Canh end can only be in high level or suspended state, canl end can only be in low level or suspended state. This ensures that when the system has errors and multiple nodes send data to the bus at the same time, the bus will be short circuited and some nodes will be damaged. At the same time, the CAN node has the function of automatically shutting down the output when the error is serious, so that the operation of other nodes on the bus will not be affected, so as to ensure that it will not appear in the network, because of the problems of individual nodes, the bus is in a "deadlock" state. These greatly reduce the development difficulty of the system and shorten the corresponding development cycle, which is incomparable to the serial bus only with electrical protocol.
Picture of CAN Bus Analyzer of Guangcheng Technology
3. The application field of CAN bus is more extensive

Because can bus has a long data transmission distance, strong anti-interference ability, many connecting node equipment and low maintenance cost in the later stage, its application scope has been extended to the automotive industry, automatic control, aerospace, navigation, process industry, mechanical industry, textile machinery, agricultural machinery, robots, CNC machine tools, medical devices and sensors and other fields. At present, can bus has become an international standard and is recognized as one of the most promising field buses.

Just because can bus has such a wide range of applications and plays such an important role, we should ensure that it always maintains the best working condition. At this time, the corresponding maintenance tool can bus analyzer is indispensable, such as the usbcan-ii Pro CAN Bus Analyzer of Shenyang Guangcheng technology. The usbcan-ii Pro CAN Bus Analyzer of Shenyang Guangcheng technology is a high-performance can bus communication interface card integrating two can interfaces. This model of CAN Bus Analyzer can be compatible with USB2.0 bus full speed specification. With usbcan-ii Pro type can bus analyzer, PC can be quickly connected to can bus network through USB interface, forming can bus network control node for data processing and data collection in the field of CAN bus network, such as field bus laboratory, industrial control, intelligent community, automobile electronic network, etc.

Usbcan-ii Pro can bus analyzer is a powerful tool for CAN bus product development and can bus data analysis. It has the characteristics of compact size, plug and play, and is also the choice of portable system users. USB interface is provided on usbcan-ii Pro type can bus analyzer, which integrates can interface electrical isolation protection module to avoid equipment damage caused by instantaneous overcurrent / overvoltage and enhance the reliability of the system in harsh environment.