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A “pin” is an input or output on the Smoothieboard.
In a lot of cases ( step/direction for external stepper motors, button inputs ), you can use any pin for any use.
If other cases, a given pin is tied to a given peripheral on the board.
See [http://smoothieware.org/pinout Pinout] to learn about which pins are where.
You can have a pin's output inverted by adding a “!” after this pin's number in the config line, example :
There are other modifiers for pins :
! | invert pin | |||
o | set pin to open drain | |||
^ | set pin to pull up | |||
v | set pin to pull down | |||
- | to set no pullup | |||
@ | to set repeater mode |