hi,
do not label me as Guru, please - here there are many people who know much more than me.
As about this problem: it was not hard because I have experience with PC-COM-UART communication. Some of projects I realized, use such scheme. Thanks God, both MCU and PC programs were done with me and so I just looked at the old sources (Keil ASM and M$ Visual C++) and located the difference.

In fact, I full agree with Kai Klaas, who said:
"I wonder, how people can expect any detailed help if information given by them is so lousy."

In Ahmed case, it was just a fortune that I have once programmed the same task.

Regards, people,
have a nice weekend!
Oleg