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Granted. If the calibration has moved that
far out on its own, then there is a serious problem.
Although we'd like to expect that competent people will
use the calibration routine, imagine what would happen if when calibrating, they
hit anywhere but the calibration targets. Or the person's shirt sleeve
hits the touch screen off target while they're steadying themselves to hit the
target. The calibration routine will adjust its matrix to that new
information and would be completely out of calibration. Without
keyboard navigation in this scenario, it may be impossible for someone competent
to select the calibration function from the touch screen. The feedback
they get from experimenting with touches to the left or right may indicate that
to activate the button, they have to touch two inches off the left side of
the screen.
It
would be useful to recover from this situation without having to reload the
WinCE image.
Another area where keyboard navigation would be useful
is during the manufacturing process. When powering units for the first
time, the calibration settings are unknown. There needs to be a method of
selecting the calibration function in case the initial touch screen calibration
will not allow activation of this function through the touch
screen.
The
specs are attached below.
Ian
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ELO AccuTouch Specifications.pdf