说明：  针对单片机数据采集系统，用Matlab实现上位机，实现从串口读取采集数据并实时绘制信号波形，包括初始化主机串口、按照通信协议调用回调函数读取数据，并实时刷新波形显示。
(For SCM data acquisition system, the Matlab computer, data read the serial port acquisition and real-time signal waveform drawing, including the initialization callback function called the host a serial port, according to the communication protocol to read data, real-time refresh and waveform display.)