Specifications

Touch Controllers Reference Guide28
Calibrate Extended
Syntax: <SOH>CX<CR>
Description: Initiates an interactive, two-point calibration.
During the calibration process, you define the active area of the
touchscreen by mapping locations to an absolute X, Y coordinate
system. You touch two target areas on the screen. Touching the
target areas sends the X, Y coordinates for those touch points to the
controller. The controller calculates all other touch points based on
these two points.
The Calibrate Extended command functions exactly like the Calibrate
New command with one exception. For Calibrate Extended, the
calibration targets (points) are set inward from the corner of the video
image. This enhancement makes the calibration process easier and
more accurate.
Determining Target Areas
The default calibration targets (points) are located 12.5% (1/8) inward
from the corner of the video image.
For example, suppose the display resolution of your monitor is
640 x 480. The Calibrate Extended command calculates the amount
to move inward as follows:
Amount to move inward in the X direction: 640 x 1/8 = 80
Amount to move inward in the Y direction: 480 x 1/8 = 60
The Calibrate Extended command then positions the first calibration
target inward from the lower left corner (0,479) and the second
calibration target inward from the upper right corner (639,0). The
following illustration shows how the calibration targets are calculated.