uart in       CY8C4247LQI-BL483

PutChar() sends a single character to UART while PutString() sends a null-terminated string of arbitary length to the interface.

In your example UART_UartPutChar(tx_data[0])  I cannot see any initialization for tx_data[0].

Can you please post your complete project or a shortened version that shows the error so that we all can have a look at all of your settings. To do so, use
Creator->File->Create Workspace Bundle (minimal)
and attach the resulting file.

Bob

Rushin your received signal is AA 10101010=AA why do you think it should be 01000001 01000001? 

Rushin 0XAA is not ascii AA it is DEC 170 or bin 10101010 your returned value is 100000101000001 that is hex 4141 or 16705 dec.  You need to define that data as char. I'll check your program for more information.

Here is an example program that echo's what you type on the terminal .

UARTPutChar() will only put a single ASCII character (or one byte) of data into the UART buffer; In order to write the ASCII sequence "AA", you would want to call it twice like this:

UART_UartPutChar('A');

UART_UartPutChar('A');

Note: 0xAA gives the binary value: 10101010 as a single byte binary value.

'A' on the other hand gives: 01000001 as a single byte binary value.

The syntax is different when working with binary, hexadecimal, and ascii.

binary begins with 0b followed by 8 ones or zeroes.

hexadecimal is 0x followed by two alphanumerics: 0-9,A-F as valid characters

ascii is just the visible character you want to write inside single quote marks: 'A' or 'B' etc.

'A' = 0x41 = 0b01000001,

ASCII vs Hexadecimal vs Binary

You should check out this Printf instructions it may help you.

I changed your characters to ASCII hex codes  so I could read them and it worked fine. . I don't know what  you are feeding them too but it may be a timing issue. You maybe feeding it too fast for the device to respond to the input.

worked here no issue I'll send the program with your code added. The for loop runs continuously so you will need to modify it.