vb.net2005的串口通讯测试源码，自动检测本机可用串口，设置波特率\DTR\RTS,字符模式或16进制接收和发送数据。与下位机通讯的利器。-vb.net2005 serial communications test source, the machine can automatically detect the serial port, set baud rate \ DTR \ RTS, character or hexadecimal mode to send and receive