May have an issue

G540 manual
the pulse polarity for the step and direction signals are ACTIVE HIGH.


UCCNC manual
Dir port & pin: Which is the physical output pin on the UC100 device for the step signal. The
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signal can be configured active low or active high selecting or unselecting a checkbox next to the
field. Changing the active polarity of the signal reverses the axis running direction.

Can this be the cause? How do I reverse the polarity while keeping the active high set?