The communication distance can be up to 10KM (the rate is less than 5Kbps) The rate can reach 1Mbps (the communication distance is less than 40M). The transmission distance is inversely proportional to the rate, and there are also higher wire requirements.
CAN bus features: data communication is not divided into master and slave, any one node can be initiated to any other (one or more) node data communication, relying on the node information priority order to determine the order of communication, high-priority node information in the 134 μs communication of more than one node at the same time initiated communication, the priority of the low priority to avoid the priority of the high.
Expanded Information:
There are many cases in which multiple buses are constructed, and the number of harnesses increases. In 1986, Bosch, a German electrician, developed the CAN communication protocol for automobiles in order to reduce the number of wiring harnesses and to enable high-speed communication of large amounts of data over multiple LANs. Since then, CAN has been standardized by ISO11898 and ISO11519, and has become the standard protocol for automotive networks in Europe.
The high performance and reliability of CAN has been recognized and is widely used in industrial automation, ships, medical equipment, industrial equipment, and so on. Fieldbus is one of the hotspots of technological development in the field of automation today, and is known as the computer LAN in the field of automation. Its emergence provides strong technical support for distributed control systems to realize real-time, reliable data communication between nodes.
Baidu Encyclopedia-CAN bus