What does the LIN line in a car mean?

[SanKathryn]

LIN bus is a low-cost serial communication network defined for automotive distributed electronic systems. It serves as a supplement to other automotive multiplex networks such as the Controller Area Network (CAN) and is suitable for applications that do not require high network bandwidth, performance, or fault tolerance. The working principle of the LIN bus is as follows: The control units controlled by the LIN bus are generally distributed in relatively close proximity. Data transmission is single-wire, with each node supplying power to the bus via a resistor connected to the positive terminal of the battery. Each node can pull down the bus voltage through an internal transmitter. The master control unit monitors the data transmission process and data transmission rate: The LIN master control unit is connected to the CAN data bus, monitors the data transmission process and rate, and sends message headers. It acts as a "translator" between the LIN control units in the LIN data bus system and the CAN bus, enabling self-diagnosis of the LIN master control unit and the connected LIN slave control units. At the beginning of each message, the LIN master control unit sends a message header: The LIN master control unit ensures that each message on the bus starts with a header sent by the LIN master control unit. This header consists of a synchronization phase, and the LIN master control unit transmits current information in a cyclic manner. Slave control units perform data transmission via the LIN bus: LIN slave control units can only transmit data via the LIN bus when commanded by the LIN master control unit. Sensors are signal input devices, and each sensor integrates an electronic control device that analyzes measured values. The analyzed values are transmitted as digital signals via the LIN bus.