3M Touch Systems Proprietary Information
EX II Serial Controllers
Reference Guide
EX II 1710SC
EX II 1720SC
EX II 1750SC
EX II 7720SC
3M Touch Systems
Read and understand all safety information
contained in this document before using this product.
2 EX II Serial Controllers Reference Guide
3M Touch Systems Proprietary Information
The information in this document is subject to change without notice. No part of this document may be reproduced or transmitted
in any form or by any means, electronic or mechanical, for any purpose, without the express written permission of 3M Touch
Systems, Inc. 3M may have patents or pending patent applications, trademarks, copyrights, or other intellectual property rights
covering subject matter in this document. The furnishing of this document does not give you license to these patents, trademarks,
copyrights, or other intellectual property except as expressly provided in any written license agreement from 3M Touch Systems,
Inc.
The information provided in this document is intended as a guide only. For the latest detailed engineering specifications, please
contact your 3M Touch Systems, Inc. Application Engineer. 3M Touch Systems, Inc., Inc is committed to continually improving
product designs, as a result, product specifications may be subject to change without notification.
"RoHS Directive compliant" means that the product or part does not contain any of the following substances in excess of the
following maximum concentration values in any homogeneous material, unless the substance is in an application that is exempt
under RoHS: (a) 0.1% (by weight) for lead, mercury, hexavalent chromium, polybrominated biphenyls or polybrominated
diphenyl ethers; or (b) 0.01% (by weight) for cadmium. Unless otherwise stated by 3M in writing, this information represents
3M’s knowledge and belief based on information provided by third party suppliers to 3M.
NOTICE: Given the variety of factors that can affect the use and performance of a 3M Touch Systems, Inc. Product (the
“Product”), including that solid state equipment has operation characteristics different from electromechanical equipment, some
of which factors are uniquely within User’s knowledge and control, it is essential that User evaluate the 3M Touch Systems, Inc.
Product and software to determine whether it is suitable for User’s particular purpose and suitable for User’s method of
application. 3M Touch Systems, Inc. statements, engineering/technical information, and recommendations are provided for
User’s convenience, but their accuracy or completeness is not warranted. 3M Touch Systems, Inc. products and software are not
specifically designed for use in medical devices as defined by United States federal law. 3M Touch Systems, Inc. products and
software should not be used in such applications without 3M Touch Systems, Inc. express written consent. User should contact
its sales representative if User’s opportunity involves a medical device application.
IMPORTANT NOTICE TO PURCHASER: Specifications are subject to change without notice. These 3M Touch Systems,
Inc. Products and software are warranted to meet their published specifications from the date of shipment and for the period
stated in the specification. 3M Touch Systems, Inc. makes no additional warrantie s, express or implied, inc l uding but not
limited to any implied warranties of merchantability or fitness for a particular purpose. User is responsible for determining
whether the 3M Touch Systems, Inc. Products and software are fit for User’s particular purpose and suitable for its method of
production, including intellectual property liability for User's application. If the Product, software or software media is proven
not to have met 3M Touch Systems, Inc. warranty, then 3M Touch Systems, Inc. sole obligation and User’s and Purchaser’s
exclusive remedy, will be, at 3M Touch Systems, Inc. option, to repair or replace that Product quantity or software media or to
refund its purchase price. 3M Touch Systems, Inc. has no obligation under 3M Touch Systems, Inc. warranty for any Product,
software or software media that has been modified or damaged through misuse, accident, neglect, or subsequent manufacturing
operations or assemblies by anyone other than 3M Touch Systems, Inc. 3M Touch Systems, Inc. shall not be liable in any
action against it in any way related to the Products or software for any loss or damages, w hether non-specified direct,
indirect, special, incidental or consequential (including downtime, loss of profits or goodwill) regardless of the legal
theory asserted.
© 2001-2005 3M All rights reserved.
Printed in the United States
Document Title: EX II Serial Controllers Reference Guide
Document Number: 29087, Version 01
MicroTouch, the MicroTouch logo, and ClearTek 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.
3M Touch Systems Proprietary Information
Contents
Chapter 1 Introduction
What You Need to Know ...........................................................................................5
Important Safety Information.....................................................................................5
Touch Screen Care and Cleaning ...............................................................................6
Contacting Technical Support ....................................................................................7
3M Touch Systems, Inc. Worldwide Offices .............................................................7
Chapter 2 Integrating the EX II Controllers
Overview of the EX II Touch Screen Controllers ......................................................9
EX II 17xxSC Dimensions.......................................................................................10
EX II 7720SC Dimensions.......................................................................................10
Handling and ESD Protection ..................................................................................11
Establishing the Data Connection ............................................................................11
Mounting the Controller...........................................................................................12
Supplying Power to the Controller...........................................................................12
Mounting the Touch Screen .....................................................................................13
Turning On Your System .........................................................................................13
Status Light (LED) Diagnostics ...............................................................................14
Installing Software ...................................................................................................15
Chapter 3 EX II Controller Communications
Controller Default Settings.......................................................................................17
Communicating with the Controller.........................................................................18
Firmware Commands ...............................................................................................20
Calibrate Extended ...................................................................................................21
Calibrate Raw...........................................................................................................23
Diagnostic Command...............................................................................................24
Format Raw ..............................................................................................................25
Format Tablet ...........................................................................................................26
Mode Stream ............................................................................................................27
Name Command.......................................................................................................27
Null Command .........................................................................................................28
Output Identity .........................................................................................................28
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3M Touch Systems Proprietary Information
Parameter Set............................................................................................................28
Reset .........................................................................................................................29
Restore Defaults .......................................................................................................30
Unit Type Verify ......................................................................................................30
Appendix A EX II 17xxSC Controller Specifications
Technical Specifications...........................................................................................34
Physical Dimensions ................................................................................................34
Female Connector on the Touch Screen Cable ........................................................36
Communication Connector.......................................................................................36
Appendix B EX II 7720SC Controller Specifications
Touch Screen Cable Connections.............................................................................38
Communication Connector.......................................................................................38
Technical Specifications...........................................................................................39
Physical Dimensions ................................................................................................39
3M Touch Systems Proprietary Information
CHAPTER 1
Introduction
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 manual, directed to developers of touch screen systems, provides
installation and configuration information for the 3M Touch Systems EX II serial
capacitive touch screen controller. This document includes information on integrating the
EX II controller into your design, communicating with the controller, installing the
TouchWare or MT 7 software user interface, and troubleshooting setup problems. It also
includes a complete description of the firmware commands, a guide to interpreting status
LED conditions, 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.
As such, our approach to the European Union Directives 2002/96/EC (WEEE) and
2002/95/EC (RoHS) (the directives) is being addressed in the same rigorous manner. To
ensure compliance with the directives, we are pleased to provide this RoHS compliant
product.
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 and understand 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.
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3M Touch Systems Proprietary Information
Intended Use
The EX II controller was designed to enable touch in conjunction with other 3M Touch
Systems products and was tested to replace an existing serial controller. This controller
is intended for internal use only and is not designed for use in hazardous locations.
DANGER
To avoid the risk of fire and/or explosion which will result in serious injury or
death:
• Do not install or use this product in a hazardous location.
WARNING
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.
WARNING
To avoid the risk of fire and/or explosion which could result in serious injury or
property damage:
• Do not install or use this product in a hazardous location.
• Do not use this product in any outdoor environment unless NEMA (or other
similar) standards, such as IP rating, are followed.
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 local, state, and federal 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.
Explanation of Symbols
Attention: Read accompanying documentation
Touch Screen Care and Cleaning
The touch screen requires very little maintenance. 3M Touch Systems, Inc. recommends
that you periodically clean the glass touch screen surface.
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. In addition, 3M
Screen and Keyboard Cleaner CL680 has been tested and approved for this use.
CAUTION
Introduction 7
3M Touch Systems Proprietary Information
To avoid the potentially hazardous situations associated with the use of alcohol or
other solvents 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.
• 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 touch screen. Do not use
any vinegar-based solutions.
Apply the cleaner with a soft, lint-free cloth. Avoid using gritty cloths.
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.
Always handle the touch screen with care. Do not pull or stress cables.
Contacting Technical Support
3M Touch Systems, Inc. is committed to helping you get the most out of your touch
screen by providing extensive Technical Support. Visit the 3M Touch Systems, Inc.
website at http://www.3Mtouch.com/, where you can download touch screen software
and drivers, obtain regularly updated technical documentation on 3M Touch Systems,
Inc. products, and learn more about our company.
Whenever you contact Technical Support, please provide the following information:
• Display manufacturer and model number
• Touch screen part number and serial number
• Current driver version
• Operating system used
• Information on additional peripherals
Technical Support is available Monday through Friday 8 a.m. to 8 p.m. US Eastern
Standard Time – 9 a.m. to 5 p.m. throughout Europe. Limited call back service is
available Saturdays and Sundays 9 a.m. to 5 p.m.
You can contact 3M Touch Systems, Inc. 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
• Email: US-TS-techsupport@mmm.com
3M Touch Systems, Inc. Worldwide Offices
Contact information for all offices can be accessed through the website:
http://www.3Mtouch.com/.
3M Touch Systems Proprietary Information
CHAPTER 2
Integrating the EX II Controllers
The 3M Touch Systems EX II controller provides a drop-in replacement for an existing
controller with wide dynamic range, increased noise immunity, wide operating
temperature stability, reprogrammability using software utilities and improved capability
in ungrounded environments.
The EX II 1700SC and 7720SC series capacitive controller firmware is optimized for
Cleartek II touch screens integrated in the latest flat panel displays.
This chapter covers the following EX II controller specifications:
• Cable connections
• Mounting requirements
• Power requirements and options
• Status LED codes
Overview of the EX II Touch Screen Controllers
The EX II controllers and touch screens are supplied separately. A 25-point linearization
procedure has been performed to determine the physical properties of the touch screen,
and the data is stored in a 2D bar code label attached to the touch screen flex cable.
• The EX II 1710SC and 1750SC are available in N81 Format Tablet either cased or
uncased for external or internal mounting.
• The EX II 1720SC is available in N72 Format Tablet either cased or uncased for
external or internal mounting.
• The EX II 7720SC is available in N81 Format Tablet uncased without cable for
mounting within a custom chassis.
To integrate and test the EX II controller, you need the following items:
• A 3M Touch Systems capacitive touch screen. The touch screens are available in a
variety of sizes.
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3M Touch Systems Proprietary Information
• A method of establishing the serial data communication between the controller and
your system. The standard 3M Touch Systems RS-232 serial cable (P/N 7310101) is
recommended.
• A method of supplying power to the controller -- either internal or external.
• A touch screen driver with a calibration routine.
Note: You can use either TouchWare or MT 7 software, which include the touch
screen device driver and utilities software as the software interface.
EX II 17xxSC Dimensions
The EX II 17xxSC cased version measures 2.5 x 3.75 inches with a total height of
approximately 1 inch when the touch screen cable is attached. The cased version comes
with a standard serial cable.
The EX II 17xxSC uncased version measures 2.25 x 3.6 inches with a total height profile
of 0.5 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 EX II 17xxSC has a NOVRAM touch
screen connector and a serial cable connector.
Figure 1. EX II 17xxSC Overall Dimensions
EX II 7720SC Dimensions
The EX II 7720SC controller measures 1.3 x 2.6 inches with a total height profile of 0.38
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 EX II 7720SC has a 5-pin touch screen connector
and a serial cable connector.
Integrating the EX II Controllers 11
3M Touch Systems Proprietary Information
Figure 2. EX II 7720SC Overall Dimensions
Handling and ESD Protection
When mounting the touch screen and controller, use normal precautions for handling
electrostatic sensitive devices. The EX II controllers have internal protection to ±27 kV
for ESD discharges to the touch screen (not to the controller directly) that may occur
during normal operation of the touch screen. Refer to Appendix A for further
specifications.
Establishing the Data Connection
The EX II controllers require that an RS-232 serial communication cable be attached to
connector JP1.
You can use a standard 3M Touch Systems RS-232 cable (P/N 7310101) or an equivalent
interconnect. One end of this cable plugs into the RS-232 connector (JP1) on the
controller. The other end, which has a 9-pin D connector, plugs directly into a serial
COM port on your PC. Table 1 describes the interconnections for the 3M Touch Systems
RS-232 cable.
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3M Touch Systems Proprietary Information
Table 1 COM Cable for EX II 17xxSC and 77xxSC Controller
PC Side (9-Pin D) Wire Controller Side (7-Pin Molex)
Pin RS-232 Assigned Jumpered to: Color Pin Description
1 Data Carrier Detect
(DCD)
4 and 6 DTR and DSR ⎯ None
2 Receive Data (RXD) Brown 2 Transmit Data (TXD)
3 Transmit Data (TXD) Red 3 Receive Data (RXD)
4 Data Terminal Ready
(DTR)
1 and 6 DCD and DSR ⎯ None
5 Signal Ground Blue 5 Power supply ground
6 Data Set Ready (DSR) 1 and 4 DCD and DTR ⎯ None
7 Request to Send (RTS) Black 1 Request to Send (RTS)
8 Clear to Send (CTS) Green 4 Clear to Send (CTS)
9 Not Used Do not ground
Sleeve White 6 DC power jack (+5 VDC)
Pin ⎯ 7 Cable shield connected to
ground. DC power jack ground
Shell ⎯ 7 Chassis (earth) ground
Mounting the Controller
The uncased controller is mounted internally. Choose a convenient spot away from high-
voltage, high power cables and electronics. Use 4-40 metal screws to mount the
controller using the two diagonal mounting holes in the board. The controller is mounted
in line with the touch screen cable exit point to minimize cable flexing. The controller is
mounted behind or on the side of the display on stand offs to allow room for the touch
screen cable connector. Refer to Figure 1 for more details on controller mounting.
Supplying Power to the Controller
You must supply the EX II controller with power. You can use internal power (that is, tap
power from inside the monitor or PC) or external power.
However you supply power, the source must deliver 85 mA typical (110 mA maximum),
with a maximum ripple and noise of 50mV peak-to-peak.
CAUTION
To avoid possible damage to the controller, you must provide a path for electrostatic
discharge. The controller-mounting hole near the touch screen connector should be
used to connect to chassis safety ground and must be attached by the shortest possible
route to a good earth return (chassis) in all applications.
You can supply power to the ClearTek II controller using any of the following methods.
The voltage input can vary from +5VDC to +12VDC. Exact specifications can be found
in the appendices.
Integrating the EX II Controllers 13
3M Touch Systems Proprietary Information
• (EX II 7720SC only) Internal power +5V to +12 V DC though the 2-pin power input
connector pin 2 (+5V to 12 V) and pin 1 (RTN). A square pin indicator on the bottom
of the board marks pin 1.
• Internal power (+5V to +12V DC) through a custom serial cable configuration.
• External power (+5 V DC) from a wall-mount power supply.
Note: To avoid possible damage to one or both of the power supplies, do not supply
both internal power and external power to the controller. Power from two sources could
cause damage.
Using an Internal Power Supply (+5V to +12V) to JP3
Provide power directly to the controller using JP3 (Molex 22-05-3021). Use a mating 2-
pin connector and connect Pin 2 to power (between +5V and +12V) and Pin 1 to the
return. (Mating connector is the Molex housing 22-01-3027 with 08-50-0114 contacts).
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: (refer to Table 12 for more information on actual
cable connections).
1. Obtain a 7-pin Molex connector 51004-0700.
2. Attach power and ground to the connector, (Pin 6: +5V to +12V, Pin 7: Ground).
Using an External Wall-Mount Power Supply
If you are using a standard 3M Touch Systems RS-232 serial cable (P/N 7310101),
consult your applications engineer for power supply specifications.
Mounting the Touch Screen
There are several methods for mounting the touch screen depending on your application
(CRT displays or flat panel displays, each in a variety of sizes). If you need instructions
or recommendations from 3M Touch Systems on how to incorporate a touch screen into
your design, refer to the ClearTek II Touch Screen Integration Guide (P/N 19-278v02).
All 3M Touch Systems documentation is available from the corporate website at
www.3Mtouch.com.
Turning On Your System
Before you turn on your custom 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 monitor and computer.
2. Adjust the contrast and brightness to suit your personal preference and working
environment.
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3M Touch Systems Proprietary Information
3. Adjust the horizontal and vertical position controls on the monitor to center the image
on the screen.
Status Light (LED) Diagnostics
3M Touch Systems controllers are highly reliable units; however, there may be occasions
when the controller does not perform exactly as you expected. The EX II controller
provides diagnostic feedback with a light emitting diode (LED) on the component side of
the board that indicates the status of the touch screen unit.
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.
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 touch screen. When you touch the touch screen, the LED becomes bright as
long as a touch is detected.
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 EX II Controllers
Flashes Error Description What to do...
1 Reserved.
2 Reserved.
3 Setup error. Unable to establish operating
range at power-up. Nonrecoverable error.
Replace controller. If error reoccurs, might be a
touch screen problem.
4 Controller NOVRAM error. The
operating parameters in the controller
NOVRAM are invalid. Using defaults.
Restore defaults. If fault persists, replace
controller. If error reoccurs, might be a touch
screen or cable problem.
5 HDW error. The controller hardware
failed (unable to initialize or load
program). Nonrecoverable error.
Replace controller.
6 Reserved.
7 Cable NOVRAM error. The linearization
data in the cable NOVRAM is invalid.
At startup, the cable NOVRAM error will flash
the LED until the controller receives any valid
command from host.
8 Controller NOVRAM error. The
controller linearization data in NOVRAM
is invalid.
Replace touch screen or perform a 25-point
linearization. Contact Technical Support.
9 Reserved
10 Controller EEPROM not formatted Reload program code
11 Invalid controller block 5 Not applicable to serial controller.
12 Invalid controller block 6 Restore defaults if possible, otherwise replace
controller.
Integrating the EX II Controllers 15
3M Touch Systems Proprietary Information
Installing Software
Both TouchWare and MT 7 software include the software driver that enables your touch
screen to work with your computer. 3M Touch Systems has touch screen drivers for
many operating systems, including Windows 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 touch screen software for your operating system.
Both TouchWare and MT 7 software include a control panel for setting your touch screen
preferences and a diagnostic utility. If you are experiencing problems with the touch
screen, you can use the diagnostic utilities provided to locate the touch screen controller
and test the touch screen.
For more information on connecting your cables and installing and using the touch screen
control panel and utilities, refer to either the TouchWare Software User Guide or the MT
7 Software User Guide available on the corporate website at www.3Mtouch.com.
3M Touch Systems Proprietary Information
CHAPTER 3
EX II Controller Communications
This chapter discusses the fundamentals of communicating with the EX II controller. The
firmware commands, which are usually issued by a driver or utility program on the host
system, control the operation of the touch screen 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.
Controller Default Settings
Communication Parameters
The default operation of the EX II controllers is N81 (no parity, 8 data bits, and 1 stop
bits) at 9600 baud. The EX II 1720SC can be programmed to work with even/odd parity,
7 data bits, and 1 or 2 stop bits.
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 EX II
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 Touch Systems touch screen
controllers.
• It is the standard for current 3M Touch Systems product development and is the
format used by all touch screen drivers written by 3M Touch Systems.
Refer to the Format Tablet command in the firmware reference section. Note that both
TouchWare and MT 7 software automatically set communications parameters to N81.
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3M Touch Systems Proprietary Information
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 EX II controller. In Mode Stream, the
controller sends a continuous stream of data packets when the screen is touched. The
controller sends the data as long as a touch continues on the touch screen.
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 screen driver generate an interrupt as each
packet in the data stream arrives. Because touchdown and liftoff events are specially
coded, your software always knows exactly what the user is doing, if the interrupts are
sent as recommended. 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 EX II 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.
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).
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3M Touch Systems Proprietary Information
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 screen.
The 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. See 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.
20 EX II Serial Controllers Reference Guide
3M Touch Systems Proprietary Information
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 EX II 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 screen users do not have to use firmware commands to use their touch
systems. For example, users can use either TouchWare or MT 7 software to calibrate the
touch screen 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 screen and
render it inoperable. You should be aware of the results before executing any firmware
commands.
To optimize the performance of the Cleartek II touch screen controller and simplify the
development of custom drivers, 3M Touch Systems recommends you use the commands
listed in Table 3 for current development. Using these commands ensures compatibility
with all 3M Touch Systems controllers.
Note: When you enter commands in terminal mode, precede each command with
<CTRL> A to enter the start of header.
EX II Controller Communications 21
3M Touch Systems Proprietary Information
Table 3 Firmware Commands for EX II Development
Command Code Description
Calibrate
Extended
CX Initiates an interactive 2-point calibration.
Calibrate Raw CR Collects the raw X and Y coordinates before normal scaling, linearization, and
filtering process.
Diagnostic DX Determines if there is a problem with the touch screen.
Format Raw FR Returns the signal level (amount of touch) of each of the four touch screen
corners in digital format.
Format Tablet FT Outputs the X/Y touch coordinate data in a five-byte packet. Preferred for current
development.
Mode Stream MS Sends a continuous stream of X/Y coordinate data when you touch the screen.
Name NM Returns a controller identifier string.
Null Command Z Queries the controller and waits for a response.
Output Identity OI Identifies the controller type and the firmware version.
Parameter Set Ppds[b] Lets you adjust the communication parameters (parity, data bits, and stop bits) of
the controller.
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 Verify UV Identifies the touch screen controller on your system.
Calibrate Extended
Syntax: <SOH>CX<CR>
Note: This command should not be used when TouchWare or MT 7 software is being
used. The CX command will interfere with the auto orientation algorithm. To calibrate,
use the 2- or 4-point calibration in TouchWare or MT 7 software.
Description: Initiates an interactive 2-point calibration.
During the calibration process, you define the active area of the touch screen by mapping
locations to an absolute X/Y coordinate system. You touch two target areas on the
screen. 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 screen, 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.
22 EX II Serial Controllers Reference Guide
3M Touch Systems Proprietary Information
• The controller stores the data in non-volatile memory (NOVRAM). Therefore, you
do not have to calibrate the screen each time you power on the system. You should,
however, recalibrate the touch screen 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 monitor 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.
*The coordinates are in video terms, with the origin (0, 0) in the upper left corner of the screen. Examples from the
controller’s perspective, however, place the origin at the lower left corner of the screen (numbers in brackets). The
controller outputs 0 to 1024 on both axes independent of display screen resolution.
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 screen 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 Rest command and then
start over again.
Upper Right Calibration Target
X = 1023 – (1024 x 1/8) = 1023 – 128 = 895
Y = 0 + (768 x 1/8) = 0 + 96 = 96
(0, 0)
(
0, 767
)
[
0,0
]
*
(1023, 0) [1024, 1024]*
(80, 60)
(560, 420)
Lower Left Calibration Target
X = 0 + (1024 x 1/8) = 0 + 128 = 128
Y = 767 - (768 x 1/8) = 767 - 96 = 671
(128, 671)
(895, 96)
[1024, 0]*
EX II Controller Communications 23
3M Touch Systems Proprietary Information
3. Touch the screen 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 EX II 1700SC and 7720SC
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 the user did not touch the target long enough to provide an accurate
calibration point.
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:
24 EX II Serial Controllers Reference Guide
3M Touch Systems Proprietary Information
S = Status byte, first byte of data. Refer to Table 4.
Xx = X (horizontal) coordinate data; second and third bytes of data
Yy = Y (vertical) coordinate data; fourth and fifth bytes of data.
Table 4 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 5 describes the meaning of the bits in the status byte (Byte 1).
Table 5 Calibrate Raw Status Bits
Bit Description Values
S0 – S5 Reserved —
S6 Proximity (touch state) 1 = Touch screen is being touched (a touchdown or a continued touch).
0 = Touch screen 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 the controller to check for touch screen 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.
EX II Controller Communications 25
3M Touch Systems Proprietary Information
Format Raw
Syntax: <SOH>FR<CR>
Description: Returns the signal level (amount of touch) of each of the four touch screen 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 6 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 7 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.
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 touch
screen 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 6 General Packet Format
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
26 EX II Serial Controllers Reference Guide
3M Touch Systems Proprietary Information
Table 7 I/Q Corner Component
Byte Bits 0 – 7
N b0 – b6: bits 25-31 of respective I/Q corner data
b7: Always 0
N+1 b0 – b6: bits 18-24 of respective I/Q corner data
b7: Always 0
N+2 b0 – b6: bits 11-17 of respective I/Q corner data
b7: Always 0
N+3 b0 – b6: bits 4-10 of respective I/Q corner data
b7: Always 0
N+4 b0 – b3: bits 0-3 of respective I/Q corner data
b4 – b7: Always 0
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 touch
screen 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 screen causes the controller to
return a response in the following format:
SXxYy
S = Status byte, first byte of data. Refer to Table 8.
Xx = X (horizontal) coordinate data; second and third bytes of data.
Yy = Y (vertical) coordinate data; fourth and fifth bytes of data.
EX II Controller Communications 27
3M Touch Systems Proprietary Information
Table 8 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 9 defines the status bits (Byte 1) for the Format Tablet data.
Table 9 Format Tablet Status Bits
Bit Description Values
S0 – S5 Reserved —
S6 Proximity (touch state) 1 = Touch screen is being touched (a touchdown or a continued touch).
0 = Touch screen 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.
Mode Stream
Syntax: <SOH>MS<CR>
Description: Sends a continuous stream of X/Y coordinate data when you touch the screen. The
controller continues to send data as long as you touch the screen. 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 (e.g., EXII-7720 Rev. 3.0) The content and format of this command can
change and therefore is not intended for normal customer use.
28 EX II Serial Controllers Reference Guide
3M Touch Systems Proprietary Information
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 Touch Systems controller.
Xxxx = Four ASCII characters that indicate a build identifier.
Parameter Set
Syntax: <SOH>Ppds[b]<CR>
where:
P = Parity type
N = No parity
O = Odd parity
E = Even parity
D = Number of data bits (7 or 8).
S = Number of stop bits (1 or 2)
B = Communication rate
1 = 19200 baud 4 = 2400 baud
2 = 9600 baud 5 = 1200 baud
3 = 4800 baud
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.
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.
EX II Controller Communications 29
3M Touch Systems Proprietary Information
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.
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.
30 EX II Serial Controllers Reference Guide
3M Touch Systems Proprietary Information
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 10 lists the factory defaults for the EX II controller. The Restore Defaults
command is useful in situations where inadvertent commands to the controller have
rendered the touch screen inoperative.
Table 10 EX II Factory Default Settings
Operating Parameter Default
Baud Rate 9600
Serial Communication Settings N, 8, 11
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 touch
screen using a 2-point calibration.
Response: <SOH>0<CR> Positive response.
Unit Type Verify
Syntax: <SOH>UV<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.
QM = Serial controller
Ffff = Four ASCII characters that indicate the features supported by the
controller.
R= Indicates a resistive controller
1 The EX II 1720SC controller operates at N, 7, 2.
EX II Controller Communications 31
3M Touch Systems Proprietary Information
V= Indicates the serial 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)
3M Touch Systems Proprietary Information
APPENDIX A
EX II 17xxSC Controller Specifications
This section provides controller specifications such as power requirements,
environmental requirements, and cable connectors.
The EX II 17xxSC controller is a compact (3.5 x 2.25 x 0.3 inches), RS-232 serial
controller. This controller can be internally mounted in your monitor, or enclosed in a
molded plastic case (3.75 x 2.5 x 0.9 inches) and mounted to the back or side of your
monitor.
The following figures show the overall dimensions of the EX II 17xxSC controller and
the locations of the mounting holes and connectors.
Figure 3 Uncased EX II 17xxSC Touch Screen Controller
34 EX II Serial Controllers Reference Guide
3M Touch Systems Proprietary Information
Figure 4 Cased EX II 17xxSC Touch Screen Controller
Technical Specifications
The controller specifications listed below were validated in test systems containing 3M
Touch Systems components. These specifications may not be valid if configured with
components from suppliers other than 3M Touch Systems. All components in the
manufacture of electronic controllers are RoHS Directive compliant (2002/95/EC).
Physical Dimensions
Uncased 3.50 in. x 2.30 in. x 0.45 in. (88.9 mm x 58.4 mm x 11.4 mm)
Cased 3.75 in. x 2.50 in. x 0.90 in. (95.3 mm x 63.5 mm x 22.9 mm)
Board Level Functions
Power
5 VDC (80 mA typical, 100 mA maximum); ± 5% regulation 50 mVpp maximum
ripple and noise
12 VDC (85 mA typical, 100 mA maximum); ± 10% regulation 50 mVpp 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
FCC Class B / CISPR22 Class B Class B Compliant
VCCI Class B ITE Emissions (Japan) Class B Compliant
EX II 17xxSC Controller Specifications 35
3M Touch Systems Proprietary Information
AS/NZS 3548:1995/CISPR 22 Class B ITE Emissions (Aus.) Class B Compliant
RFI – EN 61000-4-3 / ENV 50140 Class A Compliant
CRFI – EN 61000-4-6 N/A Cable < 3 meters long
Class A < 80% Screen Area
Class B ≥ 80% Screen Area N/A
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
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
Storage Temperature Range - 50 °C to +85 °C
Storage Humidity Range < 36°C 0-80% RH
≥ 36 °C
Performance and Reliability
Minimum Touch Duration As low as 3 msec.
Touch Resolution – (Maximum addressable coordinates generated by the controller) 16K x 16K
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 Touch Systems touch screen connected to the controller
MTBF (by MIL Std. 217F Calculation)> 740,000 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)
Touch Screen Compatibility 3M Touch Systems Capacitive Touch Screens
Communications Protocol Serial RS 232
36 EX II Serial Controllers Reference Guide
3M Touch Systems Proprietary Information
Female Connector on the Touch Screen Cable
The touch screen cable has a 12-pin (2 x 6) dual row female connector that plugs into the
controller. Table 11 describes the pins on this connector. The touch screen connector
always exits towards the serial cable.
Table 11 Touch Screen Cable Connector for EX II 17xxSC Controllers
Pin Wire Color Description
1 ——— NOVRAM interface
2 ——— NOVRAM interface
3 ——— NOVRAM interface
4 ——— +5 VDC
5
6
7
Gray
Green
Orange
Power supply ground
Chassis (earth) ground
+12V input
8 Brown Cable
shield/drain wire
Connects to the flex tail shield, which must not be grounded because the EX II
17xxSC drives the flex tail shield with an AC waveform.
9
10
11
12
White
Red
Black
Blue
Upper right (UR) corner
Lower right (LR) corner
Upper left (UL) corner
Lower left (LL) corner
Communication Connector
All EX II 17xxSC controllers have an attached RS-232 communication cable with a 9-pin
D female connector. Table 12 describes the pins for this cable, which connects to a serial
communication (COM) port on the PC. A 9-pin to 25-pin adapter is available.
Table 12 COM Connector for EX II 1700SC Controllers
9-pin D 7-pin Molex Wire Color Description
1 No
connection
——— Data Carrier Detect (DCD).
Connected to DTR and DSR.
2 2 Brown Transmit Data (TXD). Pin 2 is the
controller’s output to the host.
3 3 Red Receive Data (RXD). Pin 3 is the
controller’s receive from the host.
4 No
connection
——— Data Terminal Ready (DTR).
Connected to DSR and DCD.
5 5 Blue Power supply ground.
6 No
connection
——— Data Set Ready (DSR).
Connected to DTR and DCD.
7 1 Black Request To Send (RTS).
Connected to CTS.
8 4 Green Clear To Send (CTS).
Connected to RTS.
9 Not used
Sleeve 6 White DC power jack (+5 VDC).
Pin 7 ——— Cable shield connected to ground.
DC power jack (ground).
Shell 7 ——— Chassis (earth) ground.
3M Touch Systems Proprietary Information
APPENDIX B
EX II 7720SC Controller Specifications
This section provides controller specifications such as power requirements,
environmental requirements, and cable connectors. The EX II 7720SC controller is a
compact RS-232 serial controller. This controller can be internally mounted in your
monitor.
The following figures show the overall dimensions of the EX II 7720SC controller and
the locations of the mounting holes and connectors.
Figure 4 EX II 7720SC Touch Screen Controller
38 EX II Serial Controllers Reference Guide
3M Touch Systems Proprietary Information
Touch Screen Cable Connections
The touch screen cable has a 5-pin single row locking female connector that plugs into
the controller. Table 13 describes the pins on this connector.
Table 13 Touch Screen Cable Connector for EX II 7720SC Controllers
Pin Wire Color Description
3 Cable shield/drain wireConnects to the flex tail shield, which must not be grounded
because the EX II 7720SC drives the flex tail shield with an AC
waveform.
1
2
4
5
Upper left (UL) corner
Upper right (UR) corner
Lower right (LR) corner
Lower left (LL) corner
Communication Connector
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 Touch
Systems RS-232 serial cable (P/N 7310101). Table 14 describes the pins for this cable,
which connects to a serial communication (COM) port on the PC.
Table 14 COM Connector for EX II 7720SC Controllers
9-pin D 7-pin Molex Wire
Color Description
1 No
connection
——— Data Carrier Detect (DCD).
Connected to DTR and DSR.
2 2 Brown Transmit Data (TXD). Pin 2 is the controller’s output to the host.
3 3 Red Receive Data (RXD). Pin 3 is the controller’s receive from the host.
4 No
connection
——— Data Terminal Ready (DTR).
Connected to DSR and DCD.
5 5 Blue Power supply ground.
6 No
connection
——— Data Set Ready (DSR).
Connected to DTR and DCD.
7 1 Black Request To Send (RTS).
Connected to CTS.
8 4 Green Clear To Send (CTS).
Connected to RTS.
9 Not used
Sleeve 6 White DC power jack (+5 VDC).
Pin 7 Shield Cable shield connected to ground.
DC power jack (ground).
Shell 7 ——— Chassis (earth) ground.
EX II 7720SC Controller Specifications 39
3M Touch Systems Proprietary Information
Technical Specifications
The controller specifications listed below were validated in test systems containing 3M
Touch Systems components. These specifications may not be valid if configured with
components from suppliers other than 3M Touch Systems. All components in the
manufacture of electronic controllers are RoHS Directive compliant (2002/95/EC).
Physical Dimensions
Uncased 2.55 in. x 1.30 in. x 0.45 in. (65.0 mm x 33.0 mm x 11.4 mm)
Board Level Functions
Power 5 to 12 VDC (85 mA typical, 110 mA maximum); ± 5% regulation
50 mVpp 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
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
RFI – EN 61000-4-3 / ENV 50140 Class A Compliant
CRFI – EN 61000-4-6 N/A Cable < 3 meters long
Class A < 80% Screen Area
Class B ≥ 80% Screen Area N/A
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
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
Storage Temperature Range - 50 °C to +85 °C
Storage Humidity Range < 36°C 0-80% RH
40 EX II Serial Controllers Reference Guide
3M Touch Systems Proprietary Information
≥ 36 °C
Performance and Reliability
Minimum Touch Duration As low as 3 msec.
Touch Resolution – (Maximum addressable coordinates generated by the controller) 16K x 16K
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 Touch Systems touch screen connected to the controller
MTBF (by MIL Std. 217F Calculation)> 700,000 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)
Touch Screen Compatibility 3M Touch Systems Capacitive Touch Screens
Communications Protocol Serial RS 232
