CAN总线的自收发实验源码，附注解。和两个节点相比，只修修改了相关寄存器模式。有兼容51的CAN开发板应该可以直接运行。-Self CAN bus transceiver experimental source explanatory notes

1：对于易能系列的变频器进行输出频率的上位机修改 2：在研华的4017、4018、4060各个功能模块下实现温度，压强，流量的采集。 3：实现串口通信-1: For Encom series of inverter output frequency of the PC modification 2: Implementing acquisition temperature, pressure, flow rate at Advantech s 4017,4018,4060 vario

自己写的西门子200程序，已经测试过了，可通过程序修改设定值，P,I，D(The Siemens 200 program I wrote has been tested and can be modified by program, P, I, D)