说明：  CAN在工业中应用越来越广泛，由于它相比232，485等总线特殊的优点在汽车，电梯等应用中占据非常重要的地位。本代码采用51开发环境，利用C和汇编混合编写的实用程序，供大家学习参考
(CAN application in industry more and more extensive, compared to 232,485 because of its advantages such as special bus in the automotive, elevator applications occupy a very important position. This code using 51 development environment, using C and assembler utility hybrid prepared for them to learn from reference)