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How to communicate between RS232 VB6.0 & 8051 keil C

I want to have some leds in P2.0~2.3 and show off the "ON" lamp in VB6.0 program though RS232 during the sensors are +5V output to P1.0~1.3 89S52 MCU. But it appears many errors and doesn't work in PC. Please advise me the comments for the following code. Thanks a lot!!

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