TMS570LS3137: TMS570LS3137: Using the SCI fort Uart Communication

I designed an interface with Visual Studio for the embedded code written in Code Composer Studio, but I am having problems with serial communication.
The processor can send data but I cannot send data from terminal.

I used the Youtube video of "TI" company named "Hercules Tutorial: Using the SCI for Uart Communication" as a reference.

I can't send data even though I've done the ones there one-to-one. Can you send me an example code to be understand better. 


Command for sending and receving from video:

---------->sciSend(scilinREG, 21, (unsigned char*)"Please press a key!\r\n");

----------->sciReceive(scilinREG, 1, (unsigned char*)&command);

Referance Video Link: https://www.youtube.com/watch?v=PpalANwuzIo

Thanks & regards