CAN is a high-performance serial data local area communication network composed of CAN controller. It is one of the most widely used fieldbuses in the world and belongs to the category of fieldbus. It is a serial communication network that effectively supports distributed control or real-time control. Fieldbus is one of the hot spots in the field of automation technology development, and is known as the computer LAN in the field of automation. It provides powerful technical support for distributed control system to realize real-time and reliable data communication between nodes.
The CAN bus is connected to the physical bus through the two output terminals CANH and CANL on the CAN controller interface chip, and the CANH terminal can only be in high or suspended state, and the CANL terminal can only be in low or suspended state.