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dear sir, My project is to interface a 8051 with a pc.. i have to send datas through pc and this will rotate a motor. the results from microcntroller are displayed in the pc.. but in the pc the data s are getting lost and they are not displayed. please help me
In that case, you are on the wrong site!
There is a vast array of books and websites that detail the architecture of the PC - this is not one of them!
But remember that this has absolutely nothing whatsoever to do with your 8051 project!
The PC neither knows nor cares what is connected to its COM port - all it knows is that characters arrive at the port, and it sends characters to the port.
Where those characters come from & go to, and what they mean, is entirely irrelevant to the PC - it makes absolutely no difference whatsoever to the PC whether the COM port is connect to another PC, or a terminal, or a modem, or an 8051, or anything else!