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Limit switch connections

I am planning to put Hall effect limit detectors on X and Z.  It appears the connections to the ELS would go in thru the expansion slot.  I plan to have 4 sensors on a sort of 'bus' with one leg on ground, and the other legs in parallel on each of 4 sensors.  Thus if any one closes the ELS will stop.

I see the 3 axis enable pins - is there a master enable that will do a complete  shutdown? Also what is the disabling  state of any of the pins - low or high?