一个很好的用mscomm控件实现串口通讯的程序，可以用来实现串口调试，程序实现了十六进制发送和文本发送两种功能，功能强大-Mscomm with a good realization of serial communication control procedures, can be used to achieve serial debugging, the program has hexadecimal and text to send to send two functions, a pow