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all that i know that i can use the RS232 module in SOPC but how to use it and program it in assembly
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Why assembly? Almost everyone uses C. Nios dev tools provide the driver for the rs232 module with the basic functions to send/receive data.
Browse the forum and Altera website: you'll find a lot of code samples.
On the PC side the simplest solution is using Hyperterminal or a similar program to send commands and receive answers with a ASCII protocol.
If you need something more complex, like file transfer, you must write a specific client program which manages serial port data according to your needs.
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