对CAN协议的详细注解，和功能的描述这本CAN 规范技术规范由两部分组成：

• A 部分：CAN 的报文格式说明（按CAN1.2 规范定义）。

• B 部分：标准格式和扩展格式的说明。

为了兼容CAN2.0，要求CAN 的仪器应兼容A 部分或B 部分。-CAN agreement on annotation, and functional descr iption of these technical specifications of the CAN specification is composed of two parts: •　A part of: CAN format the message (according to the definition of norms CAN1.2). •　B parts: a standard format and extended format. In order to compatible CAN2.0, the requirements of CAN-compatible devices should be part A or part B.