Specifications

Chapter 2 Firmware Commands 29
(0, 0)
(0, 479)
(639, 0)
(80, 420)
(560, 60)
Upper right calibration target.
X coordinate: 640 - (640 x 1/8) = 640 - 80
Y coordinate: 0 + (480 x 1/8) = 0 + 60
Lower left calibration target.
X coordinate: 0 + (640 x 1/8) = 0 + 80
Y coordinate: 480 - (480 x 1/8) = 480 - 60
For some controllers, you can adjust the default calibration points
using the Set Parameter Block command. For more information,
contact MicroTouch.
Guidelines for Calibrate Extended
Here are several guidelines for using the Calibrate Extended command:
The controller uses the data immediately before liftoff to register a
calibration touch. Therefore, users can touch off the target, move
their finger to the target, hold for one second, and then lift off their
finger. Instructing users to touch this way results in a more
accurate calibration.
If you are using both a pen and your finger as touch devices, you
must calibrate the screen twice: once with your finger and once
with the pen. The system stores both sets of calibration points.
The controller stores the data in non-volatile memory
(NOVRAM). Therefore, you do not have to calibrate the screen
each time you power on the system. You should, however,
recalibrate the touchscreen any time the video display changes or
gets repositioned.
You can cancel a calibration at any time by issuing a Reset
command.