使用了Labview中程序设计模式“基本状态机”，完成了串口输入控制命令，继电器输出执行的功能。其中继电器控制的子VI是通过DLL调用实现的。使用者可以自行将其替换，只要使用这个控制框架即可。-Using Labview to program design model " basic state machine" , completed the serial input control commands, relay output functions performed. Which relay control sub-VI is achieved through DLL calls. User can manually replace it, as long as you can use this control framework.