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EX II 3000SP Controller Reference Guide
3M Touch Systems Proprietary Information
*The coordinates are in video terms, with the origin (0, 0) in the upper left corner of the screen. Examples
from the controller’s perspective, however, place the origin at the lower left corner of the screen (numbers
in brackets). The controller outputs 0 to 1024 on both axes independent of display screen resolution.
Calibrate Extended Procedure
To use the CX command:
1.
Enter the Calibrate Extended (CX) command. The controller sends an initial
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
<SOH>0<CR>, you must start over 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>. This is a positive response. If you receive a negative response,
you must start over again.
Touching the two valid calibration points results in a successful calibration.
If either calibration point is invalid, the calibration fails. The EX II 3000SP
controller restores the factory default calibration. If the Calibrate Extended
failed, repeat the CX process.
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, you must start over again.
Upper Right Calibration Target
X = 1023 – (1024 x 1/8) = 1023 – 128 = 895
Y = 0 + (768 x 1/8) = 0 + 96 = 96
(0, 0)
(
0, 767
)
[
0,0
]
*
(
1023, 0) [1024, 1024]*
(80, 60)
(560, 420)
Lower Left Calibration Target
X = 0 + (1024 x 1/8) = 0 + 128 = 128
Y = 767 - (768 x 1/8) = 767 - 96 = 671
(128, 671)
(895, 96)
[
1024, 0]*