串口状态的检测,可以检测到连接串口的设备是否正常连接或是哪种设备-state tests can detect serial port to connect the equipment or normal connecting what equipment

COM端口监听搜索程序VB源代码，查找本机可用的COM端口，并显示出端口信息，很实用的程序。-COM port to monitor the search process VB source code available to find the local COM port, and port information is shown, it is of practical procedures.