通过VC.net2005编写的上位机通讯软件，通过RS232对下位机的sd卡进行读写、擦除操作。-Written by VC.net2005 PC communications software, through to the next crew RS232 sd card read and write, erase operation.

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