3M
™
MicroTouch
™
Controller SX112
Reference Guide
(formerly EX II 3700SP)
Read and understand all safety information
contained in this document before using this product.
3
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2 3M™ MicroTouch™ Controller SX112 Reference Guide
The information in this document is subject to change without notice. No part of this document may be reproduced or transmitted
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Copyright © 2002-2009 3M All rights reserved.
Document Title: 3M
TM
MicroTouchTM Controller SX112 Reference Guide
Document Number: 19-256, Version 22
3M, the 3M logo, MicroTouch, the MicroTouch logo are either registered trademarks or trademarks of 3M in the United States
and/or other countries.
Windows and/or other Microsoft products referenced herein are either registered trademarks or trademarks of Microsoft
Corporation in the U.S. and/or other countries.
All other trademarks are the property of their respective owners.
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3M™ MicroTouch™ Controller SX112 Reference Guide 3
Contents
About This Manual
What You Need to Know ...........................................................................................5
Important Safety Information.....................................................................................5
Sensor Care and Cleaning ..........................................................................................6
3M Touch Systems Support Services.........................................................................7
Contact 3M Touch Systems .......................................................................................7
Chapter 1 Integrating the SX112 Controller
Overview of the SX112 Touch Controller .................................................................9
Handling and ESD Protection ..................................................................................10
Establishing the Data Connection ............................................................................10
Mounting the Controller...........................................................................................10
Supplying Power to the Controller...........................................................................10
Mounting the Sensor ................................................................................................11
Turning On Your System .........................................................................................11
Status Light (LED) Diagnostics ...............................................................................11
Installing 3M™ MicroTouch™ Software ................................................................12
Chapter 2 SX112 Controller Communications
Overview of Firmware Commands ..........................................................................13
Controller Default Settings.......................................................................................14
Communicating with the Controller.........................................................................14
Firmware Commands ...............................................................................................16
Calibrate Extended ...................................................................................................18
Calibrate Raw...........................................................................................................20
Diagnostic Command...............................................................................................21
Finger Only ..............................................................................................................21
Format Raw ..............................................................................................................21
Format Tablet ...........................................................................................................23
Mode Stream ............................................................................................................24
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4 3M™ MicroTouch™ Controller SX112 Reference Guide
Name Command.......................................................................................................24
Null Command .........................................................................................................24
Output Identity .........................................................................................................24
Parameter Set............................................................................................................25
Pen/Finger ................................................................................................................26
Pen Only...................................................................................................................26
Reset .........................................................................................................................26
Restore Defaults .......................................................................................................26
Unit Type..................................................................................................................27
Appendix A SX112 Controller Specifications
Controller Technical Specifications .........................................................................30
Pen Technical Specifications....................................................................................31
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3M™ MicroTouch™ Controller SX112 Reference Guide 5
About This Manual
3M Touch Systems offers several advanced controllers designed for reliability and easy
installation. Each controller provides superior performance and delivers excellent
stability, sensitivity, accuracy, and fast response.
This reference guide, designed for developers of touch systems, provides installation and
configuration information for the 3M™ MicroTouch™ SX112 touch controller. This
document includes information on integrating the SX pen controller into your design,
communicating with the controller, installing the MT 7 software user interface, and
troubleshooting setup problems. It also includes a complete description of the firmware
commands and controller specifications.
3M Touch Systems is committed to being a premier supplier in touch systems throughout
the world. As a 3M Touch Systems customer, you are aware that we have strong internal
programs that meet or exceed environmental regulations of our customers and the regions
in which we conduct business.
What You Need to Know
This document assumes you are familiar with firmware commands and how to use them.
Executing some commands may alter the performance of your touch product. You should
be aware of the results of using these commands before executing them.
Important Safety Information
Read, understand and follow all safety information before using this product. Follow all
instructions marked on the product and described in this document. Pay close attention to
the following installation warnings and safety precautions.
Intended Use
The SX112 pen controller was designed to enable surface capacitive touch in
conjunction with other 3M™ MicroTouch™ sensor products and was tested to replace
an existing serial controller. This controller is intended for internal mounting only and
is not suitable for use in hazardous locations.
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6 3M™ MicroTouch™ Controller SX112 Reference Guide
Explanation of Signal Word Consequences
WARNING: Indicates a potentially hazardous situation, which, if not avoided,
could result in death or serious injury and/or property damage.
CAUTION: Indicates a potentially hazardous situation, which, if not avoided,
may result in minor or moderate injury and/or property damage.
CAUTION: Indicates a potentially hazardous situation, which, if not avoided, may
result in property damage.
WARNING
To reduce the risk of fire and/or explosion which could result in serious injury or
death:
Do not install or use this product in a hazardous location.
To reduce the risk of fire and/or explosion which could result in serious injury or
property damage:
Do not use this product in any outdoor environment unless NEMA standards (or
similar standards such as IP rating) are followed.
To avoid the risk of electric shock which could result in serious injury or death:
• Do not use a damaged power supply.
• Do not use a power cord that is frayed or otherwise damaged.
CAUTION
To reduce the risks associated with improper disposal, which if not avoided may
result in minor or moderate injury from ground water contamination:
Dispose of components in accordance with federal, state and local regulations.
To reduce the risk of possible environmental contamination which may result in
minor or moderate injury:
Dispose of the display in accordance with federal, state and local regulations.
To avoid the potentially hazardous situations associated with the use of isopropyl
alcohol which may result in minor or moderate injury or property damage:
Follow all instructions and recommendations in the manufacturer's Material Safety
Data Sheet and product label.
Sensor Care and Cleaning
The sensor requires very little maintenance. 3M Touch Systems recommends that you
periodically clean the glass surface.
CAUTION
To reduce the risk of the potentially hazardous situations associated with the use of
isopropyl alcohol which may result in minor or moderate injury or property
damage:
Follow all instructions and recommendations in the alcohol manufacturer's Material
Safety Data Sheet and product label.
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3M™ MicroTouch™ Controller SX112 Reference Guide 7
Typically, an isopropyl alcohol and water solution ratio of 50:50 is the best cleaning
agent for your touch screen. You can also use straight isopropyl alcohol. Be sure to
follow solvent manufacturer's precautions and directions for use when using any solvents.
• It is important to avoid using any caustic chemicals on the sensor.
• Always dampen the cloth and then clean the screen. Be sure to spray the cleaning
liquid onto the cloth, not the screen, so that drips do not seep inside the display or
stain the bezel.
• Apply the cleaner with a soft, lint-free cloth. Avoid using gritty cloths.
• Always handle the sensor with care. Do not pull on or stress flex tail.
3M Touch Systems Support Services
3M Touch Systems provides extensive support services through our website and
technical support organization. Visit the 3M Touch Systems website at
http://www.3M.com\touch
regularly updated technical documentation on 3M Touch Systems products, and learn
more about our company.
Whenever you contact Technical Support, please provide the following information:
• Touch display size, part number and serial number
• Current driver version
• Operating system used
• Information on additional peripherals
, where you can download touch software and drivers, obtain
Technical Support is available Monday through Friday 8:30 a.m. to 5:30 p.m. with
limited call back service after 5:30 p.m. until 8:00 p.m. US Eastern Standard Time – 9
a.m. to 5 p.m. throughout Europe.
You can contact 3M Touch Systems Technical Support (US only -- Eastern Standard
Time) by calling the hot line, sending email or a fax.
• Technical Support Hot Line: 978-659-9200
• Technical Support Fax: 978-659-9400
• Toll Free: 1-866-407-6666 (Option 3)
• Email: US-TS-techsupport@mmm.com
Contact 3M Touch Systems
Contact information for all offices can be found on our website at:
http://www.3M.com\touch/
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3M™ MicroTouch™ Controller SX112 Reference Guide 9
CHAPTER 1
Integrating the SX112 Controller
The 3M™ MicroTouch™ SX112 controller provides a drop-in replacement for the entire
family of pen controllers with all the improved features of the EX II ASIC including wide
dynamic range, increased noise immunity, wide operating temperature stability,
reprogrammability using software utilities and inherent ungrounded capability.
This chapter covers the following SX112 controller specifications:
• Cable connections
• Mounting requirements
• Power requirements and options
• Status LED codes
Overview of the SX112 Touch Controller
The SX112 is a form, fit and functional replacement for an existing controller with a
standard RS-232 serial interface. The SX112 controller, sensor, stylus and cables are
supplied separately.
To effectively integrate and test the SX112 controller, you will need the following items:
• A 3M™ MicroTouch™ pen (P/N 69-502 with 7311420 cable extension to connect to
controller). A complete integration kit is also available: P/N 69-901.
• A 3M™ MicroTouch™ surface capacitive touch sensor
• A method of establishing the serial data communication between the controller and
your system. The 3M™ MicroTouch™ RS-232 serial cable (P/N 7311273) is
recommended.
• A method of supplying +12VDC power to the controller.
• A touch driver with a calibration routine. You can use 3M™ MicroTouch™ MT 7
software which includes the necessary touch driver and utilities software.
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10 3M™ MicroTouch™ Controller SX112 Reference Guide
Handling and ESD Protection
When mounting the sensor and controller, use normal precautions for handling
electrostatic sensitive devices. The SX serial controllers have internal protection to ±27
kV for ESD discharges to the sensor (not to the controller directly) that may occur during
normal operation of the sensor. Refer to the appendices for further specifications.
Establishing the Data Connection
You will need a method of establishing the serial data communication between the
controller and your system. You can build your own or purchase the standard 3M™
MicroTouch™ RS-232 serial cable (P/N 7310101). Table 1 describes the pins for this
cable, which connects to a serial communication (COM) port on the PC.
Table 1 Controller Pinouts for JP1, JP2 and JP3 Connectors
Pin JP1 (Sensor) JP2 (Pen) JP3 (Power)
1 UL Ground +12V
2 UR Pen Tip Ground
3 Shield Reserved Receive data (RXD)
4 LR Reserved Transmit date (TXD)
5 LL Reserved Reserved
6 Ground Shield Reserved
7 N/A N/A Reserved
Mounting the Controller
The controller should be mounted on the chassis inside the monitor. Choose a convenient
spot away from high-voltage, high power cables and electronics.
Supplying Power to the Controller
You must supply the SX112 controller with power (+12 VDC) through a custom serial
cable configuration. Exact specifications can be found in Appendix A.
Note: However you supply power, the source must deliver >100 mA @ 12V ±5%
typical with a maximum ripple and noise of 50mV peak-to-peak. Mounting posts should
be grounded to the chassis.
Using a Custom Serial Cable Design
When creating a custom serial cable connection, you can provide power to the controller
through the mating Molex connector:
1. Obtain a 7-pin Molex connector 51004-0700.
2. Attach power and return to the connector (Pin 1: +12V, Pin 2: Ground).
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3M™ MicroTouch™ Controller SX112 Reference Guide 11
Mounting the Sensor
There are several methods for mounting the sensor depending on your application. If you
need instructions or recommendations from 3M Touch Systems on how to incorporate a
sensor into your design, refer to the 3M™ MicroTouch™ System 3250EX Integration
Guide (P/N 19-278). All 3M Touch Systems documentation is available from the
corporate website at www.3Mtouch.com
.
Turning On Your System
Before you turn on your touch system, ensure that all cables are connected properly and
that the controller is properly mounted. Be sure to tighten all cable connector screws.
To start up your system:
1. Turn on your display and computer.
2. Adjust the contrast and brightness to suit your personal preference and working
environment.
3. Adjust the horizontal and vertical position controls on the display to center the image
on the screen.
If the LED is on, and remains dimly lit, the controller has power and is operating
properly. If the LED is off, the controller is not receiving power.
Status Light (LED) Diagnostics
3M™ MicroTouch™ controllers are highly reliable units; however, there may be
occasions when the controller does not perform exactly as you expected. The SX112
controller provides diagnostic feedback with an LED indicator on the controller.
When you power-up the unit, the LED is bright until the controller start-up sequence is
completed. Following start-up, the LED becomes dim and remains dim as long as you do
not touch the sensor. When you touch the sensor, the LED becomes bright.
A flashing (or blinking) LED during power-up indicates the controller’s power-on
self-test failed. Refer to Table 2 for a description of each error code.
Table 2 LED Diagnostic Codes for SX112 Controllers
LED
Flashes
1 Reserved
2 Reserved
3 Setup error. Unable to establish
Error Description What to do...
operating range at power-up. Nonrecoverable error.
Replace controller. If error
reoccurs, might be a touch sensor
problem.
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12 3M™ MicroTouch™ Controller SX112 Reference Guide
LED
Flashes
4 Controller NOVRAM error. The
5 HDW error. The controller
6 Reserved
7 Reserved
8 Reserved
9 Reserved
10 Controller EEPROM not formatted Contact Tech Support or replace
11 Invalid controller block 5 Not applicable to serial controller.
12 Invalid controller block 6 Replace controller.
Error Description What to do...
Restore defaults (RD command).
operating parameters in the
controller NOVRAM are invalid.
Using defaults.
hardware failed (unable to initialize
or load program). Non-recoverable
error.
If fault persists, replace controller.
If error reoccurs, might be a touch
sensor or cable problem.
Replace controller.
controller.
Installing 3M™ MicroTouch™ Software
3M™ MicroTouch™ Software includes the driver that enables your sensor to work with
your computer. 3M Touch Systems has touch drivers for many operating systems,
including Windows Vista, XP, XP embedded, 2000, 9X, Windows Me, Windows CE,
and Windows NT 4.0 (refer to the website for a complete listing). You must be sure to
install the correct software for your operating system.
3M™ MicroTouch™ Software includes a control panel for setting your sensor
preferences and a diagnostic utility. If you are experiencing problems with the sensor,
you can use the diagnostic utilities provided to locate the controller and test the sensor.
For more information on connecting your cables and installing and using the sensor
control panel and utilities, refer to the 3M™ MicroTouch™ Software User Guides
available on the corporate website at www.3Mtouch.com
Calibrating the Sensor
Calibration aligns the sensor with the underlying video. Specifically, calibration defines
the dimensions of the image area of the sensor, determines the edges of the screen’s video
image, and locates the center of the sensor. You must calibrate the sensor by following
the instructions on the screen and test the calibration to ensure accurate operation.
Using 3M™ MicroTouch™ Software, you must perform a 25-point linearization with the
pen. When complete, you should perform a standard 2-point calibration TWICE: once
with the pen and once with your finger. This will ensure that both input methods are
accurate.
.
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3M™ MicroTouch™ Controller SX112 Reference Guide 13
CHAPTER 2
SX112 Controller Communications
This chapter discusses the fundamentals of communicating with the 3M™ MicroTouch™
SX112 controller. The firmware commands, which are usually issued by a driver or
utility program on the host system, control the operation of the touch controller, however
developers can enter these commands directly. This chapter:
• Describes the controller default settings.
• Lists the recommended firmware commands for current development.
• Describes how to use each of these commands.
• References additional commands developers may need to use.
The description of each command includes the command syntax, the default value, how
the command works, and the expected response from the controller.
Overview of Firmware Commands
Developers may use these commands when writing touch applications, developing
custom drivers or touch configurations, or testing their touch systems. Developers can
issue commands to initialize the controller, select operating modes, and execute
diagnostic functions.
Most sensor users do not have to use firmware commands to use their touch systems. For
example, users can use MT 7 software to calibrate the sensor or to determine the
controller type and firmware version.
Note: This document assumes you are familiar with standards and modes of
communication with serial devices, as well as firmware commands and how to use them.
Executing some commands may alter the performance of your sensor and render it
inoperable. You should be aware of the results before executing any firmware commands.
To optimize the performance of the 3M™ MicroTouch™ SX touch controller and
simplify the development of custom drivers, 3M Touch Systems recommends you use the
commands listed in this chapter for current development. Using these commands ensures
compatibility with all 3M™ MicroTouch™ controllers.
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14 3M™ MicroTouch™ Controller SX112 Reference Guide
Controller Default Settings
Communication Parameters
The default operation of the SX112 controller is N81 (no parity, 8 data bits, and 1 stop
bits) at 9600 baud.
Data Format
Data format refers to the type of packet the controller uses to send the X/Y touch
coordinates to the host system. Format Tablet is the default format for the 3M™
MicroTouch™ SX112 controller. In Format Tablet, the controller sends 5 bytes per point
and provides the most rapid response time to a touch.
• Format Tablet is supported by all current 3M™ MicroTouch™ touch controllers.
• It is the standard for current 3M Touch Systems product development and is the
format used by all touch drivers written by 3M Touch Systems.
Refer to the Format Tablet command in the firmware reference section. Note that 3M
MicroTouch Software automatically sets communications parameters to N81.
Operating Mode
The operating mode specifies the conditions under which the controller sends the X/Y
touch coordinates (input data packet) to the host system.
Mode Stream is the default operating mode for the SX112 controller. In Mode Stream,
the controller sends a continuous stream of data packets when the sensor is touched. The
controller sends the data as long as a touch continues on the sensor.
Because Mode Stream sends touch data continually, it is the most versatile mode, and it
provides the best response time and overall feel.
3M Touch Systems recommends that the touch driver generate an interrupt as each packet
in the data stream arrives. Because touchdown and liftoff events are specially coded, your
software can generate mouse events that correspond to what the user is doing. This
enables instant feedback and prevents data loss.
Communicating with the Controller
This section provides information on sending firmware commands to the controller and
interpreting the responses that the controller returns.
The commands listed in the following table are those that 3M Touch Systems currently
uses for development. 3M Touch Systems recommends that you use only these
commands for 3M™ MicroTouch™ SX112 controller development.
Commands to the controller are sent on the signal Receive Data (RXD) line as a serial
data stream. For each command it receives, the controller sends a response to the host on
the signal Transmit Data (TXD) line also as a serial data stream.
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3M™ MicroTouch™ Controller SX112 Reference Guide 15
Sending Commands to the Controller
When you send a command to the controller, you must use the correct command format.
The general format of a command is as follows:
<Header>Command<Terminator>
Note: The following descriptions of header, command, and terminator, use 3M Touch
Systems terminal emulator key sequences. You may need to enter the sequence in a
different format, depending on your emulator.
The header is the first character in the command string and is the ASCII start-of-header
control character SOH. The hexadecimal code for the ASCII SOH control character is 01.
To start the command sequence, use the key combination Ctrl A (^A). If you are working
with an IBM PC compatible system, the Ctrl A key combination immediately returns an
ASCII ☺ character.
The command, which always follows the header, consists of ASCII uppercase letters and
numbers only (printable characters).
The terminator is the last character of each command string and is an ASCII carriage
return CR. An ASCII CR control character is 0D hexadecimal. To enter a carriage return,
ending the command sequence, use Enter or the key combination Ctrl M (^M).
This chapter lists each command as a string of ASCII control characters and printable
characters consisting of a header, the command, and a terminator as follows:
<SOH>Command<CR>
Receiving Responses from the Controller
After executing a command, the controller returns a response or acknowledgment to the
host system. Each controller response consists of a header, the command response, and a
terminator in the following format:
<Header>Command Response<Terminator>
Note: The following descriptions of header, response, and terminator, use 3M Touch
Systems terminal emulator key sequences. The format of controller responses varies
depending on the terminal emulation mode you are using.
The header is the first character in the response string and is the ASCII start-of-header
control character SOH. The hexadecimal code for the ASCII SOH control character is 01.
If you are working with an IBM PC compatible system in terminal mode, the SOH
control character returns a ☺ character to the sensor.
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16 3M™ MicroTouch™ Controller SX112 Reference Guide
The command response, which always follows the header, is a range of ASCII characters
depending on the type of command sent. Responses can be in many forms. For example,
one standard response is 0 (ASCII character ‘zero’ or 30 hexadecimal). This response
indicates a successful command completion for most commands, while it indicates a
failed completion for other commands. Refer to the firmware reference section for a
description of what the response indicates for each particular command.
Another standard response is 1 (ASCII character ‘one’ or 31 hexadecimal). In most cases,
this response indicates the command failed. The controller received an invalid command
that it could not execute.
Some possible reasons for a command failure include:
• The command was not formatted correctly.
• The system parameters were not set up to allow command execution.
• The controller does not support the command.
The terminator is the last character of each response string and is an ASCII carriage
return CR. The hexadecimal code for the ASCII CR control character is 0D hexadecimal.
The value returned in the response will be the ASCII control character for a carriage
return, displayed on the screen as the cursor moving to the next line.
In this chapter, responses are shown as a string of ASCII characters consisting of a
header, the response, and a terminator as follows:
<SOH>Response<CR>
Controller Initialization
To initialize the SX serial controller for new development, 3M Touch Systems
recommends that the host system issue a Reset command whenever the host system is
powered on and is attempting to establish communication with the controller.
Firmware Commands
Developers may use this information when writing touch applications, developing custom
drivers or touch configurations, or testing their touch systems. Developers can use
firmware commands to initialize the controller, select operating modes, specify data
formats, and execute diagnostic functions.
Most touch systems users do not have to use firmware commands to use their touch
systems. For example, users can use 3M™ MicroTouch™ Software to calibrate the
sensor or to determine the controller type and firmware version.
Caution: This document assumes you are familiar with firmware commands and how to
use them. Executing some commands may alter the performance of your touch system
and render it inoperable. You should be aware of the results before executing any
firmware commands.
3M Touch Systems, Inc. Proprietary Information
3M™ MicroTouch™ Controller SX112 Reference Guide 17
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 5
for current development. Using these commands ensures compatibility with all 3M™
MicroTouch™ controllers.
Note: When you enter commands in terminal mode, precede each command with
<CTRL> A to enter the start of header.
Table 5 Firmware Commands for SX112 Controller Development
Command Code Description
Calibrate
CX Initiates an interactive 2-point calibration.
Extended
Calibrate
Raw
Diagnostic
Command
Finger Only
CR Collects the raw X and Y coordinates before normal scaling,
linearization, and filtering process.
DC Requests that the controller check for sensor failures such as
broken corners, broken wires, etc.
FO The controller disables the pen and only recognizes finger
touch on the sensor.
Format Raw FR Returns the signal level (amount of touch) of each of the
four sensor corners in digital format.
Format
Tablet
Mode
Stream
FT Outputs the X/Y touch coordinate data in a five-byte packet.
Preferred for current development.
MS Sends a continuous stream of X/Y coordinate data when you
touch the sensor.
Name NM Returns a controller identifier string.
Null
Z Queries the controller and waits for a response.
Command
Output
OI Identifies the controller type and the firmware version.
Identity
Parameter
Set
Ppds[b] Lets you adjust the communication parameters (parity, data
bits, and stop bits) of the controller.
Pen or Finger PF The controller recognizes both pen and finger touch. This is
the default setting.
Pen Only PO The controller is set to only recognize input from the pen
and ignores any finger contact on the touch sensor.
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 2-point calibration is lost.
Unit Type UT Identifies the touch controller on your system.
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18 3M™ MicroTouch™ Controller SX112 Reference Guide
Calibrate Extended
Syntax: <SOH>CX<CR>
Note: This command should not be used when 3M™ MicroTouch™ Software is being
used. The CX command will interfere with the auto orientation algorithm. To calibrate,
use the 2- or 4-point calibration in 3M™ MicroTouch™ Software.
Description: Initiates an interactive 2-point calibration.
During the calibration process, you define the active area of the 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 Extended command sets the calibration targets (points) inward from the
corner of the video image. Setting the targets inward makes the calibration process easier
and more accurate.
Guidelines for Calibrate Extended
Here are several guidelines for using the Calibrate Extended command:
• The controller uses the data immediately before liftoff to register a calibration touch.
Therefore, you can touch the sensor, move your finger to the target, hold for a few
seconds, and then lift off. Instructing users to touch this way results in a more
accurate calibration.
• The controller stores the data in non-volatile memory (NOVRAM). Therefore, you
do not have to calibrate the sensor each time you power on the system. You should,
however, recalibrate the sensor any time the video display changes size or resolution.
• You can restart calibration at any time during this sequence by issuing a Reset
command and reissuing a CX command.
Determining Target Areas
The default calibration targets (points) are located 12.5% (1/8) inward from the corners of
the video image. For example, suppose the display resolution of your display is 1024 x
768. The Calibrate Extended command calculates the amount to move inward as follows:
• Amount to move inward in the X direction: 1024 x 1/8 = 128
• Amount to move inward in the Y direction: 768 x 1/8 = 96
The Calibrate Extended command then positions the first calibration target inward from
the lower left corner and the second calibration target inward from the upper right corner.
The following illustration shows how the calibration targets are calculated.
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3M™ MicroTouch™ Controller SX112 Reference Guide 19
(
(
0, 0) [0, 0]*
(1023, 0) [1024, 0]*
(895, 96)
Lower Left Calibration Target
X = 0 + (1024 x 1/8) = 0 + 128 = 128
Y = 767 - (768 x 1/8) = 767 - 96 = 671
*The coordinates are in video terms, with the origin (0, 0) in the upper left corner of the sensor. Examples from the
controller’s perspective, however, place the origin at the lower left corner of the sensor (numbers in brackets). The
controller outputs 0 to 64K on both axes independent of display screen resolution.
(0, 767) [0, 1024]* [1024, 1024]*
(128, 671)
Upper Right Calibration Target
X = 1023 – (1024 x 1/8) = 1023 – 128 = 895
Y = 0 +
768 x 1/8) = 0 + 96 = 96
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 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 SX112 controller restores the
previous calibration values. 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.
No Response
Indicates that you did not touch the target long enough to provide an accurate calibration
point.
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20 3M™ MicroTouch™ Controller SX112 Reference Guide
Calibrate Raw
Syntax: <SOH>CR<CR>
Description: Allows the collection of raw (signed) X and Y coordinates before the normal scaling,
linearization, and filtering processes. The controller sends a continuous stream of data in
Calibrate Raw mode.
The Calibrate Raw data is a 5-byte packet that includes 1 status byte and 4 bytes of
binary X/Y coordinate data. Each X/Y coordinate includes 10 binary bits and 1 sign bit.
The 10 bits represent coordinates within a range of -1024 to +1023.
To use the Calibrate Raw command, the controller and host system must be in an 8-bit
data communication mode. The Calibrate Raw command returns a negative response if
the controller is not using an 8-bit communication mode. To end Calibrate Raw mode,
issue a Reset command.
3M Touch Systems uses the Calibrate Raw command during manufacturing and testing,
and recommends you only use this command for diagnostics when you want raw data.
Response: <SOH>0<CR> Positive response.
After the controller is in Calibrate Raw mode, the controller returns a response in the
following format:
SXxYy where:
S =
Status byte, first byte of data. Refer to Error! Reference source
not found.6.
Xx = X (horizontal) coordinate data; second and third bytes of data
Yy = Y (vertical) coordinate data; fourth and fifth bytes of data.
Table 6 Data Sequence
MSB* Bits LSB*
Data Sequence 7 6 5 4 3 2 1 0
S- Byte 1 1 S6
Reserved
X- Byte 2 0 X3 X2 X1 X0 Reserved
x- Byte 3 0 Xs** X9 X8 X7 X6 X5 X4
Y- Byte 4 0 Y3 Y2 Y1 Y0 Reserved
y- Byte 5 0 Ys** Y9 Y8 Y7 Y6 Y5 Y4
*MSB = Most Significant Bit, LSB = Least Significant Bit
** s = sign bit
Table 7 describes the meaning of the bits in the status byte (Byte 1).
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3M™ MicroTouch™ Controller SX112 Reference Guide 21
Table 7 Calibrate Raw Status Bits
Bit Description Values
S0 – S5 Reserved —
S6 Proximity (touch state) 1 = Sensor is being touched (a touchdown or a continued touch).
0 = Sensor is not being touched (a touch liftoff or inactive).
When the proximity bit changes from 1 to 0 (touch liftoff), the
controller outputs one final set of X/Y coordinate data with the bit
equal to 0 and the X/Y coordinate data equal to the last touch point.
S7 Packet synchronization Always 1.
Diagnostic Command
Syntax: <SOH>DX<CR>
Description: This command requests that the controller check for sensor failures such as broken
corners, broken wires, etc.
Response: <SOH>0<CR> Positive response.
<SOH>1<CR> Command not supported.
<SOH>2<CR> Failure detected.
Finger Only
Syntax: <SOH>FO<CR>
Description: The controller is set to only respond to finger touches and disable the pen.
Response: <SOH>0<CR> Positive response
Format Raw
Syntax: <SOH>FR<CR>
Description: Returns the signal level (amount of touch) of each of the four sensor corners in digital
format. The returned values are not corrected for stray values.
The Format Raw data is a 41-byte packet that includes 1 status byte and 40 bytes of
binary corner data. The first byte of each packet always has its high bit (Bit 7) set to
provide synchronization with the host system. Refer to Table 8 for General Packet
Formats. Each corner data is composed of a pair of 32-bit I and Q values, which are
delivered in 10 bytes.
I and Q are complex touch currents as measured in phase and 90 degrees out of phase
with the corner drive signal. Refer to Table 9 for I/Q Corner Components.
To use the Format Raw command, the controller and host system must be in an 8-bit data
communication mode. The Format Raw command returns a negative response if the
controller is not using an 8-bit communication mode.
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22 3M™ MicroTouch™ Controller SX112 Reference Guide
To terminate Format Raw, issue a Reset command. The controller may return several
bytes of data between the time you issue a Reset command and the controller receives it.
You can either scan the data stream for the Reset acknowledgment, or you can ignore the
response to the first Reset command and then issue a second Reset after approximately 10
seconds has passed.
Use the Format Raw command for diagnostics. Use Format Tablet for standard sensor
operation.
Response: <SOH>0<CR> Positive response.
After the controller is in Format Raw mode, the controller returns a continuous response
in the following format:
<41-byte-packet><41-byte-packet>...<41-byte-packet>...
Table 8 General Packet Formats
Byte Bits 0 – 7
1 b0 – b6: Reserved
b7: Synchronization bit (Always 1)
2-6 I component of upper left (UL) corner
7-11 Q component of upper left (UL) corner
12-16 I component of upper right (UR) corner
17-21 Q component of upper right (UR) corner
22-26 I component of lower left (LL) corner
27-31 Q component of lower left (LL) corner
32-36 I component of lower right (LR) corner
37-41 Q component of lower right (LR) corner
Table 9 I/Q Corner Components
Byte Bits 0 – 7
N b0 – b6: bits 0-6 of respective I/Q corner data
b7: Always 0
N+1 b0 – b6: bits 7-13 of respective I/Q corner data
b7: Always 0
N+2 b0 – b6: bits 14-20 of respective I/Q corner data
b7: Always 0
N+3 b0 – b6: bits 21-27 of respective I/Q corner data
b7: Always 0
N+4 b0 – b3: bits 28-31 of respective I/Q corner data
b4 – b7: Always 0
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3M™ MicroTouch™ Controller SX112 Reference Guide 23
Format Tablet
Syntax: <SOH>FT<CR>
Description: Outputs the X/Y touch coordinate data in a 5-byte packet. The packet includes 1 status
byte and 4 bytes of binary X/Y coordinate data. The protocol also establishes the X and Y
coordinate output as 14 binary bits providing a range of 0 to 16,383.
The low order bits (X3 – X0 and Y3 – Y0) are not significant in a 1024 by 1024 sensor
because data can fluctuate with each touch, and therefore may not be completely
accurate.
To use Format Tablet, the controller and host system must be in an 8-bit data
communication mode. The Format Tablet command returns a negative response if the
controller is in 7-bit format.
Response: <SOH>0<CR> Positive response.
With the controller in Format Tablet mode, touching the sensor causes the controller to
return a response in the following format:
SXxYy
S = Status byte, first byte of data. Refer to Table 10.
Xx = X (horizontal) coordinate data; second and third bytes of data.
Yy = Y (vertical) coordinate data; fourth and fifth bytes of data.
Table 10 Data Sequence
MSB* Bits LSB*
Data Sequence 7 6 5 4 3 2 1 0
S Byte 1 1 S6 S5 S4 S3 S2 S1 S0
X Byte 2 0 X6 X5 X4 X3 X2 X1 X0
x Byte 3 0 X13 X12 X11 X10 X9 X8 X7
Y Byte 4 0 Y6 Y5 Y4 Y3 Y2 Y1 Y0
y Byte 5 0 Y13 Y12 Y11 Y10 Y9 Y8 Y7
*MSB = Most Significant Bit, LSB = Least Significant Bit
Table 11 defines the status bits (Byte 1) for the Format Tablet data.
Table 11 Format Tablet Status Bits
Bit Description Values
S0 – S5 Reserved —
S6 Proximity (touch state) 1 = Sensor is being touched (a touchdown or a continued touch).
0 = Sensor is not being touched (a touch liftoff or inactive).
When the proximity bit changes from 1 to 0 (touch liftoff), the
controller outputs one final set of X/Y coordinate data with the bit
equal to 0 and the X/Y coordinate data equal to the last touch point.
S7 Packet synchronization Always 1.
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24 3M™ MicroTouch™ Controller SX112 Reference Guide
Mode Stream
Syntax: <SOH>MS<CR>
Description: Sends a continuous stream of X/Y coordinate data when you touch the sensor. The
controller continues to send data as long as you touch the sensor. The controller sends the
data even if the touch is stationary and unchanging.
The format of the coordinate data depends on the last format command received by the
controller.
Response: <SOH>0<CR> Positive response.
Name Command
Syntax: <SOH>NM<CR>
Description: This command returns a string of characters to help identify the controller. The
string contains the controller model number and current firmware revision
number. The content and format of this command can change and therefore is not
intended for normal customer use.
Null Command
Syntax: <SOH>Z<CR>
Description: Queries the controller and waits for a response.
Use Z to determine that you are communicating with the controller or to make sure that a
utility is communicating with the controller. Using this command does not affect the
controller’s current operating parameters.
Response: <SOH>0<CR> Positive response.
Output Identity
Syntax: <SOH>OI<CR>
Description: Returns a 6-character random identifier, which describes the controller type and the
firmware version number.
Response: <SOH>CcXxxx<CR>
where:
Cc = Two ASCII characters that describe the type of 3M™ MicroTouch™
controller.
Xxxx = Four ASCII characters that indicate a build identifier.
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3M™ MicroTouch™ Controller SX112 Reference Guide 25
p
Parameter Set
Syntax: <SOH>Ppds[b]<CR>
where:
= Parity type
N = No parity
O = Odd parity
E = Even parity
d =
s =
b = Communication rate
Description: Lets you adjust the communication parameters (parity, data bits, and stop bits) of the
controller. Optionally, you can change the communication rate by appending an
additional character to the command string. Upon execution of the Parameter Set
command, the controller automatically stores the new settings, the current operating
mode, and the current data format in NOVRAM.
Number of data bits (7 or 8).
Number of stop bits (1 or 2)
1 = 19200 baud 4 = 2400 baud
2 = 9600 baud 5 = 1200 baud
3 = 4800 baud
The communication parameters of the host system must match the present settings of the
controller when the command is given for it to be accepted and the changes implemented.
The process of changing the parameters takes three steps:
• The host system must first communicate with the controller using a matched set of
parameters.
• The Parameter Set command is issued with the new parameters to the controller. The
new settings take effect immediately.
• The host system must be changed to the new parameters in order to communicate
with the controller again.
Examples: <SOH>PN813<CR> Sets the serial line to no parity, eight data bits, one stop bit,
and 4800 baud.
<SOH>PN81<CR> Sets the parity, data bits, and stop bits; leaves the baud at its
previous value.
Caution: The settings are immediately written to NOVRAM, and all future
communication must occur at the new values. It is possible to set the parameters to values
that prevent future communication with the controller.
Response: <SOH>0<CR> Positive response.
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26 3M™ MicroTouch™ Controller SX112 Reference Guide
Pen/Finger
Syntax: <SOH>PF<CR>
Description: The default setting for the SX112 controller. It will recognize touch from either the pen
or finger.
Response: <SOH>0<CR> Positive response
Pen Only
Syntax: <SOH>PO<CR>
Description: The controller will disable finger touch and will only respond to the pen.
Response: <SOH>0<CR> Positive response
Reset
Syntax: <SOH>R<CR>
Description: Initializes the hardware and the firmware, causes the controller to stop sending data, and
recalculates the environmental conditions (for example, stray and offset values). The
Reset command also cancels the Format Raw, Calibrate Raw, and Calibrate Extended
commands and returns the controller to normal operation.
3M Touch Systems recommends that the host system issue a Reset command whenever
the host system is powered on and is attempting to establish communication with the
controller.
The amount of time needed to execute a Reset command ranges from 225 milliseconds to
800 milliseconds. Therefore, the application program should wait and be sure it receives
the command response before issuing another command to the controller following the
reset.
Response: <SOH>0<CR> Positive response.
Restore Defaults
Syntax: <SOH>RD<CR>
Description: Returns to the factory default operating parameters. The Restore Defaults command
copies the 3M Touch Systems factory default parameters from ROM to the non-volatile
memory (NOVRAM) and then executes a Reset command.
Table 12 lists the factory defaults for the SX112 controller. The Restore Defaults
command is useful in situations where inadvertent commands to the controller have
rendered the sensor inoperative.
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3M™ MicroTouch™ Controller SX112 Reference Guide 27
Table 12 SX112 Serial Controller Factory Default Settings
Operating Parameter Default
Baud Rate 9600
Serial Communication Settings N, 8, 1
Data Format Format Tablet
Operating Mode Mode Stream
Return to Factory Calibration Yes
The Restore Defaults command requires approximately 1.8 seconds. Therefore, the
application program should wait the maximum amount of time and be sure it receives the
command response before issuing another command to the controller.
Note: After you issue a Restore Defaults command, you must recalibrate your sensor
using a 2-point calibration.
Response: <SOH>0<CR> Positive response.
Unit Type
Syntax: <SOH>UT<CR>
Description: Responds with an 8-character identity string. This string identifies the type of controller
currently attached to the system, lists the features supported by the controller, and outputs
the status of the controller hardware (a self-test code).
Response: Returns an identification code up to 8 ASCII characters in the following format:
<SOH>TtFfffSs<CR>
where:
Tt = Two ASCII characters that identify the controller type.
TP = pen controller
Ffff = Four ASCII characters that indicate the features supported by the controller.
**** = Indicates no additional features configured
Ss = Two ASCII characters that provide status information about the controller
hardware. The two characters represent one byte. Each character is in the range
0 to 9 and A to F.
Table 2 defines the meaning of each bit (LED minus 1) in the status byte. Each
bit can be set to 1 or 0, where:
1 = Error
0 = No error
00 = No diagnostic errors (normal response)
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3M™ MicroTouch™ Controller SX112 Reference Guide 29
APPENDIX A
SX112 Controller Specifications
This section provides controller specifications such as power requirements,
environmental requirements, and cable connectors.
The controller measures 1.35 x 4.8 inches with a total height profile of 0.35 inches from
the thru hole pins on the trace side of the board to the top of the highest component on the
opposite side. The SX112 has a touch sensor connector, a pen connector and a serial
cable connector.
Figure 2 SX112 Overall Dimensions
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30 3M™ MicroTouch™ Controller SX112 Reference Guide
Controller Technical Specifications
Physical Dimensions
4.80 in. x 1.35 in. x 0.032 in. (121.9 mm x 34.3 mm x 8.2 mm)
Board Level Functions
Power
+12V Input: (100 mA typical, 110 mA maximum), ±5% regulation, 50 mV maximum ripple and
noise.
Regulatory Requirements
CE Compliant
Radiated Emissions – EN 55022:1998 Class B Compliant
AC Mains Conducted Emissions – EN 55022:1998 Class B Compliant
Telco Lines Conducted Emissions N/A N/A
RFI – EN 61000-4-3 / ENV 50140 Class A Compliant
CRFI – EN 61000-4-6 Cable < 3 meters long N/A
Class A < 80% screen area
Class C < 80% screen area
EFT (Burst Immunity) – EN 61000-4-4 Class B Compliant
ESD Susceptibility – IEC 61000-4-2 Class 1 Compliant
Surge – EN 61000-4-5 Class B Compliant
Harmonics – EN 61000-3-2 Class A Compliant
Flicker – EN 61000-3-3 Compliant
Power Frequency Magnetic Field – EN 61000-4-8 Class A Compliant
Voltage Dips – EN 61000-4-11 Class B < 5% V
Class C < 70% V Compliant
Voltage Interruptions – EN 61000-4-11 Class C Compliant
UL/cUL Compliant
FCC Class B / CISPR22 Class B Class B Compliant
VCCI Class B ITE Emissions (Japan) Class B Compliant
AS/NZS 3548:1995/CISPR 22 Class B ITE Emissions (Aus.)Class B Compliant
Ambient Operating and Storage Environmental Conditions
(All Humidity is Non-Condensing)
Operating Temperature Range -40°C to +70°C
Operating Humidity Range < 36° C 0-95% RH
≥ 36 °C see Figure 1 below
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3M™ MicroTouch™ Controller SX112 Reference Guide 31
Storage Temperature Range - 50 °C to +85 °C
Storage Humidity Range < 36°C 0-80% RH
≥ 36 °C see Figure 1 below
Performance & Reliability
Minimum Touch Duration 5.4 msec.
Touch Resolution – 16K x 16K
(Maximum number of addressable coordinates generated by the controller)
ESD Susceptibility
*
±8 kV Contact Discharge
– Class 2 per section 9 of IEC 61000-4-2 Compliant
1 false touch allowed
±27 kV Air Discharge
*
– Class 1 per section 9 of IEC 61000-4-2 Compliant
Normal Operation – No false touches
* ESD discharges to a 3M™ MicroTouch™ touch sensor connected to the controller
MTBF (by MIL Std. 217F Calculation) > 600,000 Hours
Touch System Parameters
Accuracy vs. Dynamic Temperature Change Maintains 1% Accuracy
(tested at 0 deg. C to 60 deg. C with a 0.5 deg. C/minute temperature ramp)
Communications Protocol Serial RS 232
Warranty Period 3 Years from Date of Shipment
Pen Technical Specifications
The product specifications listed below were validated in test systems containing 3M
Touch Systems’ components – pen, surface capacitive sensor and SX112 controller.
These specifications may not be valid if the pen is configured with components from
suppliers other than 3M Touch Systems.
All components used in the manufacture of MicroTouch pens are RoHS Directive
compliant (2002/95/EC).
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32 3M™ MicroTouch™ Controller SX112 Reference Guide
Physical Dimensions
Pen Construction
Body Material Lightly Textured ABS Plastic
Body Color Black
Pen Cable 0.140 Diameter Shielded Cable with Strain Relief;
Length = 42.0 ± 1 In.
Pen Connector RJ45 8 pin Connector
Pen Tip – Conductive Replaceable – 3M Touch Systems P/N 2604634
Pen Cable Mechanical Specifications
Pen End – Dynamic Pull Force Minimum 20 lb. pull force
J1 Connector End – Dynamic Pull Force Minimum 6 lb. pull force
Pen End – Cable Flexing Minimum of 3000 bends of ± 135° from normal
with an 8 oz. weight applied – bend radius of 1 inch.
J1 Connector End – Cable Flexing Minimum of 3000 bends of ± 135° from normal
with an 8 oz. weight applied – bend radius of 1 inch.
J1 Connector Mating Insertions 50 Insertions; ≤ 0.2 Ω Resistance Change
Pen Performance Specifications
Power Supply Requirement 12V DC (sourced from the controller through the
J1 connector)
Maximum Current Draw 5 mA (incremental to controller current draw)
Positional Accuracy 99.0% True Position Accuracy
Touch Resolution 2048 X 2048 when mated with an SX112 controller
Minimum Touch Duration < 14 ms when mated with an SX112 controller
ESD Susceptibility
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3M™ MicroTouch™ Controller SX112 Reference Guide 33
±8 kV Contact Discharge* - 1 “touch” allowed
Compliant with Class 2 operation per section 9 of IEC 61000-4-2
*
±22 kV Air Discharge
– Normal Operation – No false touches
Compliant with Class 1 operation per section 9 of IEC 61000-4-2
* ESD discharges to the tip and tapered end of the pen when connected to an SX112 controller
Operating and Storage Environmental Conditions
Operating Temperature Range - 15 °C to +70 °C
Operating Humidity Range < 36° C 0-90% RH
(All Humidity is Non-Condensing) ≥ 36 °C see Figure below
Storage Temperature Range - 30 °C to +70 °C
Storage Humidity Range < 36°C 0-90% RH
(All Humidity is Non-Condensing) ≥ 36 °C see Figure below
Agency Compliance UL Recognized Component (UL File No. E155649)
Reliability – Mean Time To Failure 4 Million Hours MTTF -
Calculated per Mil Handbook 217-F1 @ 35°C
Storage and Operating Temperature with Humidity Conditions
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