基于单片机的profiBUS通信，采用SPC3芯片，有全套的protel 99SE的原理图和自制的PCB，很多芯片都是自己画的，后期调试还是可以用的！-Microcontroller-based profiBUS communication, using SPC3 chip, with a full set of protel 99SE schematic and homemade PCB, many chips are their own paintings, post-commissioni