Calibrate - 3M PX5 Series Reference Manual

3M™ Multi-Touch ASIC Controller Reference Guide
To optimize the performance of the touch controller and simplify the development of
custom drivers, 3M Touch Systems recommends you use the commands listed in Table
19 for current development. Using these commands ensures compatibility with all 3M™
controllers.
Note:
<CTRL> A to enter the start of header.
Table 26. Firmware Commands for PX5nnn Serial Controller Development
Command

Calibrate

Mode Down Up
Mode Inactive
Mode Stream
Null Command
Output Identity
Soft Reset
Restore Defaults
Unit Type
Calibrate
Syntax: <SOH>CX<CR>
Response: <SOH>1<CR>
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>
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>
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.
When you enter commands in terminal mode, precede each command with
Code
CX
MDU
MI
MS
Z
OI
R
RD
UT
Valid point response.
Invalid point response
Invalid point response
3M Touch Systems, Inc. Proprietary Information
Description
Initiates an interactive 2-point calibration.
Reports touchdowns and liftoffs only.
Turns off touch reports.
Default mode. Streaming touch reports.
Returns an ACK. No effect.
Returns Identity string: ADxxxx
Resets certain modes and gets a new baseline.
Restores default settings.
Returns the Status string: AD****ss.
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