Leica TPS1200 series Technical Reference Manual page 980

Reference Line
Step 3)
defining
any necessary offsets
Step 4)
defining
the display mask
Step Description
1. The slope is always defined as starting from a 'hinge line'.
The hinge line can be horizontally and/or vertically offset from the reference
line/arc. The direction of the reference line/arc is always from the starting point.
The offsets are always relative to the direction of the reference line/arc.
When Hz Offset=0 and V Offset=0, then the hinge line is the reference line/arc.
Step Description
1. Press DMASK (F3) in the Define Slope screen to access the display mask settings
This display mask is available when using the slope method. It is user configurable
and describes the current reflector position in relation to the defined slope and
defined reference line/arc.
TPS1200 980