实现串口通讯，以及通讯数据的动态显示（曲线绘制）-Serial communication implementation, as well as the dynamic display communication data (drawn curve)

戴维南等效网络与负载串联，本程序显示界面能够实时显示负载复功率与负载阻抗对应关系(The equivalent network is connected in series with the load, the program display interface can display the complex power load and load impedance relationship)