3M M2256PW User Manual - Page 33

Calibrate

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3M™ Display M2256PW User Guide 33 Calibrate Syntax: CX Response: 1 Valid point response. A Valid Point Response ('1') signifies that a touch coordinate was detected and is in range of the expected screen target area. Two valid point responses indicate successful calibration. 0 Invalid point response An Invalid Point Response ('0') is returned if the touch coordinate is out of range. If either calibration point is invalid, the touch coordinates are discarded and the calibration points remain unchanged from their previous values. 2 Invalid point response An Invalid Point Response ('2') is returned if the user did not touch the target long enough to provide an accurate point. Description: Initiates an interactive 2-point calibration. During the calibration process, you define the active area of the touch sensor by mapping locations to an absolute X/Y coordinate system. You touch two target areas on the sensor. 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 command sets the calibration targets (points) 12½ percent inward from the corner of the video image. Setting the targets inward makes the calibration process easier and more accurate. It also establishes screen orientation. Calibrate Procedure To use the CX command: 1. Enter the Calibrate (CX) command. The controller sends an initial acknowledgment of 0. 2. Touch the sensor 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 1. This is a positive response. If you receive a negative response 0, you can cancel the calibration by issuing a Reset command and then start over again. 3. Touch the sensor 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 1. 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 PX controller restores the previous calibration values. If Calibrate fails, repeat the CX process. 3M Touch Systems, Inc. Proprietary Information

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3M™ Display M2256PW User Guide
33
3M Touch Systems, Inc. Proprietary Information
Calibrate
Syntax:
<SOH>
CX
<CR>
Response:
<SOH>
1
<CR> Valid point response.
A Valid Point Response (‘1’) signifies that a touch coordinate was detected and is in
range of the expected screen target area.
Two valid point responses indicate successful
calibration.
<SOH>
0
<CR> Invalid point response
An Invalid Point Response (‘0’) is returned if the touch coordinate is out of range. If
either calibration point is invalid, the touch coordinates are discarded and the calibration
points remain unchanged from their previous values.
<SOH>
2
<CR> Invalid point response
An Invalid Point Response (‘2’) is returned if the user did not touch the target long
enough to provide an accurate point.
Description:
Initiates an interactive 2-point calibration.
During the calibration process, you define the active area of the touch sensor by mapping
locations to an absolute X/Y coordinate system. You touch two
target areas
on the
sensor. 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 command sets the calibration targets (points) 12½ percent inward from the
corner of the video image. Setting the targets inward makes the calibration process easier
and more accurate.
It also establishes screen orientation.
Calibrate Procedure
To use the CX command:
1.
Enter the Calibrate (CX) command. The controller sends an initial acknowledgment
of <SOH>0<CR>.
2.
Touch the sensor 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 can cancel the calibration by issuing a Reset command and then
start over again.
3.
Touch the sensor 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 PX controller restores the previous
calibration values. If Calibrate fails, repeat the CX process.