Interrupt driven C program

I am using Keil version 5. I have written interrupt driven C program to send and receive serial data as well as generating square wave on port pin. When I debug the program and run it, I look for result on serial window UART1, I observe received data but not the transmitted data. How to use two serial windows UART1 and UART2 simultaneously to look for received and transmitted data. What settings I need to do? Square wave is observed on Logic Analyzer window. Only problem with transmitted data. Please suggest.

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