Deltas always work the opposite to the way you describe. The endstops need to be connected to Xmax, Ymax and Zmax. When the tower carriages are touching the endstops they are at the maximum Z height of your printer. When the nozzle touches the bed it's at Z zero.
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Re: Reprap Rostock with Repetier Firmware - what relative position is the xmin, ymin, zmin endstops?
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