Datalogic DS8100A Reference Manual page 100

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Calibration Type: XYZ calibration with Absolute X position is forced. The coordinates for the
three axes are calibrated. The X coordinate for all slaves is relative to a precise point
(reference point). This requires that the X Offset be set which will be used to harmonize the
X=0 coordinate of all of the individual slaves.
For Oscillating Mirror models the scan line must be parallel to the conveyor
direction and only the Y calibration will be performed, (the X and Z axes will
automatically be set to zero).
NOTE
Z Offset (if necessary): for packs that are elevated above the conveyor surface (for example
on tilt trays), this parameter sets an offset for the height of a pack so that Z = 0 corresponds
to the bottom of the pack.
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DS8100A REFERENCE MANUAL