用VB编程实现串口数据的传输，并画出坐标轴，添加相应的控件-VB programming serial data transmission, and draw the axes, and add the appropriate controls

用VB编程与三菱A系列PLC通信的源码,需要编写串口通讯工程的可以参考,(VB programming with Mitsubishi A series of PLC communication source code, the need to write serial communication engineering can refer to,)