The CAN bus (Controller Area Network) is a serial bus system. This bus was developed by the company Bosch and has existed since 1986. It was mainly designed for the control of electronic components in vehicles (such as motor, ABS, airbag control) to reduce wiring harnesses. The CAN bus uses an asynchronous, differential transmission method that offers high immunity to electromagnetic interference. Data transmission takes place via bitstream signals that are transmitted on two lines: the CAN high line and the CAN low line. Each control unit has its own microcontroller and thus checks the communication, using a unique address, to quickly detect errors. Thus, system queries can be carried out and status or error codes can be read with special readers. Furthermore, the CAN bus allows for the integration of various functions, which in turn reduces the complexity of the system (or vehicle). The CAN bus is also a robust system that meets high requirements for reliability and safety. Today, the CAN bus is used not only in the automotive industry, but also in other applications such as industrial automation, medical technology, and building control. Different communication protocols (CANopen) have been developed for different applications. With the help of gateways, the CAN bus can also be integrated.