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Edit by Filastruder

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[title] Configuring Active High or Active Low Endstops
[* black] If you found that any endstops are not configured properly in the last step, navigate to Settings, then to "System Editor" and open the config.g file.
[* yellow] Endstops are configured here. The first line (S0) defines all active low endstops.
[* icon_note] An active low endstop is one which pulls the signal to ground when the endstop is pressed (normally open). An active high endstop is one which pulls the signal to ground when the endstop is not pressed.
[* icon_caution] Never connect an endstop wires from +3.3v to ground. This will create a short circuit and could damage the Duet.
[* yellow] The second line (S1) defines all active high endstops.
[* icon_note] If you are unsure if your endstops are active high or active low, you can test them by observing the light next to the corresponding stepper motor connector. If the light is lit when the button is not pressed, then this would indicate an active low endstop.

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