What's the COM?
First, you'll want to find out which serial port your board is using. When you plug your
board in to USB on your computer, it connects to a serial port. The port is like a door
through which your board can communicate with your computer using USB.
You'll use Windows Device Manager to determine which port the board is using. The
easiest way to determine which port the board is using is to first check without the
board plugged in. Open Device Manager. Click on Ports (COM & LPT). You should find
something already in that list with (COM#) after it where # is a number.
Now plug in your board. The Device Manager list will refresh and a new item will
appear under Ports (COM & LPT). You'll find a different (COM#) after this item in the
list.
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