VB produced PC software successfully complete serial communication between the MCU and PC.

RS232 communication project
...........................\上位机程序最新.vbp
...........................\下位机程序20110524.c
...........................\下位机程序20110524.hex
...........................\下位机程序20110524.uv2
...........................\串口通信最新调试.DSN
...........................\向凯华上位机界面20110601.exe
...........................\向凯华电路PCB.pcb
...........................\向凯华电路原理图.DSN
...........................\向凯华电路原理图.opj

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