MicroTouch Micro Touch Capacitive Controller MT3000, Справочное руководство, Страница: 38 / 64

MT3000 Capacitive Controller Reference Guide 38
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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.
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You can cancel a calibration at any time by issuing a Reset command.
Calibrate Extended Procedure
!
To use the CX command:
1.
Enter the Calibrate Extended (CX) command.
The controller sends an acknowledgment of <SOH>0<CR>.
2.
Touch the screen at a lower left target, which is located 12.5% (1/8) in
from the corner of the video image.
The controller returns an acknowledgment of <SOH>1<CR>. This is a
positive response. If you receive a negative response, try touching the
screen again.
3.
Touch the screen at an upper right target, which is located 12.5% (1/8)
in from the corner of the video image.
The controller returns an acknowledgment of <SOH>1<CR>. If you
receive a negative response, try touching the screen again.
Touching the two valid calibration points results in a successful calibration.
If either calibration point is invalid, the calibration fails. The MT3000
controller restores the factory default calibration if the Calibrate Extended
failed.
Response: <SOH> 1 <CR> Positive response. Indicates that the controller
received a valid touch coordinate (point) when the
target was touched. Two valid touch points indicate
a successful calibration.
<SOH> 0 <CR> Negative response. Indicates that the touch point is
out of range of the expected target area. If you
receive a negative response, try touching the target
area again.
No Response Indicates that the user did not touch the target long
enough to provide an accurate calibration point.