Using the Mbed Studio serial monitor
Mbed Studio automatically detects any board you connect to your computer and opens a serial monitor tab, which displays the board's output. If you connect multiple boards, Mbed Studio opens a tab for each board.
To view a board's output correctly, select the appropriate value from the Baud rate dropdown. The baud rate you select must be the same as the baud rate of your active program.
You can have only one serial monitor open for each connected board. Close your board's serial monitor tab in Mbed Studio before you open external serial monitoring software.
To reopen the serial monitor tab, select Serial monitor from the View menu.