CAN是国际上应用最广泛的现场总线之一。最初，CAN被设计作为汽车环境中的微控制器通讯，在车载各电子控制装置ECU之间交换信息，形成汽车电子控制网络。CAN是一种多主方式的串行通讯总线，基本设计规范要求有高的位速率，高抗电磁干扰性，而且能够检测出产生的任何错误。当信号传输距离达到10Km时，CAN 仍可提供高达50Kbit/s的数据传输速率。 由于CAN总线具有很高的实时性能，因此，CAN已经在汽车工业、航空工业、工业控制、安全防护等领域中得到了广泛的应用。-CAN international application of the most extensive one of the fieldbus. Initially, CAN was designed as a vehicle environment of micro-controller communications, in the vehicle electronic control devices to exchange information between ECU, the automotive electronic control network. CAN is a major way over the serial communication bus, the basic design of the demand for a high-speed, high resistance to electromagnetic interference, but also can detect the mistakes. When the signal transmission distance to 10 Km, CAN can provide up to 50 Kbit/s data transmission rate. CAN is due to the high real-time performance, therefore, CAN has in the automobile industry, aviation industry, industrial control, security protection, and other fields have been widely applied.