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See section 2.3.1.1 RCC?, RCR? - Read Cursor Transfer for additional information.
10.7.4 Beam Window World Coordinates
Most parameters that specify spatial coordinates must be in LBA-PC world coordinates. World
coordinates are used for locations in the current frame as displayed in the beam window with no
magnification. World coordinates are displayed for computed centroid location and peak location
results, aperture location, cursor and crosshair location, and pass/fail locations. World coordinates are
dependent on the frame size, capture resolution, origin location, and pixel scale. These dependency
values may change from frame to frame.
World coordinates are based upon the Origin Location, which defines x=0, y=0. If the origin is set to
Detector lower left, Window lower left, or manual then y values increase going up and decrease going
down as viewed in the beam window. If the origin is set to Detector upper left or Window upper left
then y values increase going down and decreases going up. If manual origin is enabled then negative
x values are to the left and positive to the right, and y negative values are down and positive up. See
the LBA-PC online help for more information about using Origin Locations.
NOTE: When the Origin Location is set to Window UL or Window LL, the World Coordinate system moves relative
to the detector coordinates as the Beam Window is panned or hardware zoomed.
World coordinates are used to set the aperture center location (:APT), the manual cross-hair location
(:CHR), and the manual cursor location (:CUR).
Use the WLD? command to retrieve the location of upper left and lower right corner of the current
frame in world coordinates.
The following example describes how to retrieve the boundaries of the current frame then set the
cursor to the center of the frame.
Host sends
:WLD?
LBA-PC sends
WLD
UpperLeft=0.000e+00,0.000e+00;
LowerRight=6.630e+03,6.214e+03
Host sends
:CUR
X=3.315e+03;
Y=3.107e+03(^END
Operator’s Manual LBA-PC
Doc. No. 10654-001, Rev 4.10
205