现场总线是当今自动化领域技术发展的热点之一，被誉为自动化领域的计算机局域网。它的出现为分布式控制系统实现各节点之间实时、可靠的数据通信提供了强有力的技术支持。CAN(Controller Area Network)属于现场总线的范畴，是一种多主方式的串行通讯总线，数据通信实时性强。与其它现场总线比较而言，CAN总线具有通信速率高、容易实现、可靠性高、性价比高等诸多特点。-Fieldbus automation technology is currently one of the hotspots, known as the automation of computer local area network. It was a distributed control system between the nodes achieving real-time, reliable data communications to provide a strong technical support. CAN (Controller Area Network) field bus belonging to the scope of a multi-master mode serial communication bus, data communications and real time. Comparison with other field bus, CAN bus has a communication rate is high, easy, reliable, many features of higher cost.