用vb编写的上位机通过窜口实现对下位机-单片机的上led的控制。-vb control led through rs232 !

改程序为rs232调试程序，以pc等上位机，将此程序写入单片机，可以调试通信。-Change program for rs232 debugger to pc and other PC, this program is written microcontroller, you can debug communications.