From Manuals

UART Interrupts (uart_echo

Compatibility Eagle 50, 50E, 100

This example application utilizes the UART to echo text. The first UART, which is connected to the COM1 on the Eagle microcontroller board, is configured for 115,200 bits per second, and 8-n-1 mode. When the program is started a message will be printed to the terminal. All characters received on the UART are transmitted back to the UART.