3M™ MicroTouch™ Controller RX142 Reference Guide

19

3M Touch Systems, Inc. Proprietary Information

Table 3 Firmware Commands for RX142 Development

Command

Code

Description

Calibrate 3 Point

C3

Initiates a 3-point calibration routine.

Enter Sleep

ES

Controller enters low power mode.

Format Tablet

FT

Outputs the X/Y touch coordinate data in a five-byte

packet.

Get Controller

Number

Q002

Used to determine a controller ID number for multiple

monitor applications.

Mode Stream

MS

Sends a continuous stream of X/Y coordinate data when

you touch the sensor.

Null Command

Z

Queries the controller and waits for a response.

Output Identity

OI

Identifies the controller type and the firmware version.

Reset

R

Initializes the hardware and the firmware, causes the

controller to stop sending data, and recalculates the

environmental conditions.

Restore Defaults

RD

Returns the controller to the factory default operating

parameters. Note: the serial port is reset to N81 format

tablet and calibration data is lost.

Set Controller

Number

W002

Used to determine a controller ID number for multiple

monitor applications.

Unit Type

UT

Returns controller unit type string and status.

Calibrate 3 Point

Syntax:

<SOH>C3<CR>

Response:

<SOH>0<CR>

Positive response to initializing the command. When C3 is first

issued the controller responds with <SOH>0<CR>. After that, as the user touches each of

the three targets, the controller issues an <SOH>1<CR>.

<SOH>1<CR>

Positive touch response.

A valid touch coordinate (point) response (‘1’) signifies that a touch coordinate was

detected and is in range of the expected sensor target area. Three valid point responses

indicate successful calibration.

<SOH>0<CR>

Negative touch response.

An invalid touch coordinate (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. If you receive a

negative response, you must start over again.

<SOH>2<CR>

Negative touch response.

An invalid touch coordinate (point) response (‘2’) is returned if the user did not touch the

target long enough to provide an accurate calibration point.

Description:

Initiates an interactive 3-point calibration.