This text surrounds the development of the electric power SCADA system exactly, aiming at the present condition of the our country electric power charged barbed wire net currently, according to the oneself at the e- lectric power protect the professi

本文设计了基于USB2.0接口的RS485讯号仿真器。它通过终端应用程序软件设置串 列通信参数和数据帧发送格式，并在讯号仿真器内部形成讯号死循环反馈，即将实际发送的数据通过反馈回路回送给终端应用程序软件并显示出来。文中详细介绍了 USB接口芯片FT245R的工作原理及应用，并在MFC平台下调用FT245R的动态链接库接口函数进行终端应用程序软件设计。 -This paper is designed based on USB2.0 interface RS485 signal emulator.

在MFC中，在鼠标框出来的矩形框内，画一个椭圆-In MFC, the mouse out of the frame rectangle, draw an ellipse