3M M2256PW manual Calibrate, Command Code Description, Mdu, SOH Cxcr

3M™ Multi-touch Display M2256PW User Guide 33

Note: When you enter commands in terminal mode, precede each command with <CTRL> A to enter the start of header.

Table 17. Firmware Commands for PX Serial Controller Development
Command	Code	Description
Calibrate	CX	Initiates an interactive 2-point calibration.
Get Copyright	Q101	Returns the copyright string.
Mode Down Up	MDU	Reports touchdowns and liftoffs only.
Mode Inactive	MI	Turns off touch reports.
Mode Stream	MS	Default mode. Streaming touch reports.
Name	NM	Returns a controller identifier string.
Null Command	Z	Returns an ACK. No effect.
Output Identity	OI	Returns Identity string: ADxxxx
Reset	R	Resets certain modes and gets a new baseline.
Restore Defaults	RD	Restores default settings.
Unit Type	UT	Returns the Status string: AD****ss.

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.

3M Touch Systems, Inc. Proprietary Information – 37531 Rev D