user10761: I've looked in several places, and so far can not understand to want to be the GND who is on the board.
There is this documented anywhere?

user368: It is the 0V reference for everything else, as well as the power supply return.
"Ground (electricity)" on Wikipedia

10761: <p>I've looked in several places, and so far can not understand to want to be the GND who is on the board.</p>

<p>There is this documented anywhere?</p>
 368: <p>It is the 0V reference for everything else, as well as the power supply return.</p>

<p><a href="https://en.wikipedia.org/wiki/Ground_%28electricity%29" rel="nofollow">"Ground (electricity)" on Wikipedia</a></p>
