CANbussen

CAN bus, short for Controller Area Network bus, is a robust vehicle bus standard designed to allow microcontrollers and devices to communicate with each other within a vehicle without a host computer. It was developed by Bosch in 1983 and has since become a standard in automotive applications due to its reliability and efficiency.

The CAN bus system operates using a message-based protocol, where data is transmitted in the form of messages rather than being addressed to specific devices. This design allows for flexible and efficient communication between multiple devices. Each message contains an identifier that prioritizes the message in the bus traffic, ensuring that higher priority messages are transmitted first.

CAN bus uses a differential signaling method to transmit data, which makes it highly resistant to electrical noise and interference. This feature is crucial in automotive environments where electrical noise can be significant. The bus operates at speeds of up to 1 Mbps, depending on the configuration and requirements of the system.

The CAN bus standard is defined by the International Organization for Standardization (ISO) in the ISO 11898 series of standards. There are two main versions of the CAN bus: the original "classic" CAN (ISO 11898-1) and the more recent CAN FD (Flexible Data-Rate) (ISO 11898-1:2015), which supports higher data rates and larger message sizes.

CAN bus is widely used in various applications beyond the automotive industry, including industrial automation, medical equipment, and aerospace systems. Its simplicity, reliability, and efficiency make it a popular choice for many embedded systems requiring robust communication protocols.