CANbus network (Controller Area Network bus) is a communication protocol for internal electronic systems in vehicles. It is also widely used in other embedded systems and industrial automation fields. It was developed by Bosch in Germany in the 1980s to solve the problem of efficient communication in complex electronic systems.
1. Overview of CANbus Network
CANbus is a multi-host, broadcast communication protocol that can support communication between multiple controllers on the same network. It mainly consists of two main cables - CAN_H (high level) and CAN_L (low level), which together constitute the CAN bus.
2. Components of CANbus Network
2.1 Nodes
Each device in a CANbus network is called a node. A node can be a controller, sensor, or actuator. Each node communicates with the CAN bus through a CAN controller.
2.2 Controller
The controller is responsible for receiving and processing data from the bus, or sending data to the bus. The controller includes hardware and software parts. The hardware part usually includes a CAN controller chip, while the software part includes the CAN protocol stack.
2.3 Termination Resistors
To ensure signal integrity and avoid signal reflection, 120Ω terminal resistors are required at both ends of the CAN bus. The function of the terminal resistor is to match the impedance of the bus, thereby improving the reliability of data transmission.
2.4 Transceivers
The transceiver is responsible for transmitting signals between the CAN bus and the node. It converts the digital signal generated by the CAN controller into a level suitable for bus transmission, and converts the signal on the bus back to a digital signal and passes it to the CAN controller.
この記事をシェア
