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I have an AVR Microcontroller which send data to pc from serial port (rs-232) and get data from serial port (rs-232). also i should say that our AVR Microcontroller is in touch with pc just with 2 pins, [pin 3 (TD=Transmit data) and pin 2 (RD=Receive data)]. for example, Microcontroller send two number (A=1,B=2) to pc from serial port (rs-232) and visual c++ get it and add those number (A+B=3) then sends it to Microcontroller from serial port (rs-232). please give me an example which do this.