How it works...

The Circuit Playground Express exposes a serial device over the USB connection, which can be accessed by a number of different Terminal emulator programs. Besides screen, there are other programs, such as picocom and minicom, that may also be used.

The last parameter that was set as 115,200 in the command sets the baud rate of the connection, which should be set at that speed. Once the connection is successfully established, an interactive session is commenced that allows expressions to be directly evaluated on the device and the output is directly displayed on the Terminal.