3M Touch Screen Controller SC500 Reference Guide

SC500 USB Resistive
Controller Reference Guide

3M Touch Systems

Read and understand all safety information

contained in this document before using this product.

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. 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.

The information provided in this document is intended only as a guide. For the latest detailed engineering specifications,
please contact your 3M Touch Systems Application Engineer. 3M Touch Systems is committed to continually improving
product designs, as a result, product specifications may be subject to change without notification.

NOTICE: Given the variety of factors that can affect the use and performance of a 3M Touch Systems 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 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’ statements, engineering/technical information, and recommendations are provided for
User’s convenience, but their accuracy or completeness is not warranted. 3M Touch Systems products and software are not
specifically designed for use in medical devices as defined by United States federal law. 3M Touch Systems products and
software should not be used in such applications without 3M Touch Systems’ 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’ 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 makes no additional warranties, 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 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’ warranty, then 3M Touch Systems’ sole obligation and User’s and
Purchaser’s exclusive remedy, will be, at 3M Touch Systems’ option, to repair or replace that Product quantity or software
media or to refund its purchase price. 3M Touch Systems has no obligation under 3M Touch Systems’ 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. 3M Touch Systems shall not be liable in

any action against it in any way related to the Products or software for any loss or damages, whether non-specified
direct, indirect, special, incidental or consequential (including downtime, loss of profits or goodwill) regardless of the
legal theory asserted.

© 2004 3M All rights reserved.
Printed in the United States

Document Title: SC500 USB Resistive Controller Reference Guide
Document Number: 19-275, Version 1.0

MicroTouch, the MicroTouch logo, and ClearTek are either registered trademarks or trademarks of 3M in the United States
and/or other countries.

IBM is a registered trademark of International Business Machines Incorporated.
Microsoft, Windows, and Windows NT are registered trademarks or trademarks of Microsoft Corporation.
All other trademarks are the property of their respective owners.

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Contents

Overview

What You Need to Know......................................................................................5

Important Safety Information................................................................................ 5

3M Touch Systems Support Services ...................................................................6

3M Touch Systems Worldwide Offices................................................................ 7

Chapter 1 Integrating the SC500 USB Controller

Overview of the SC500 Touch Screen Controller ................................................ 9

Handling and ESD Protection............................................................................. 10

Establishing the Data Connection.......................................................................10

Mounting the Controller...................................................................................... 11

Supplying Power to the Controller...................................................................... 11

Mounting the Touch Screen................................................................................ 12

Touch Screen Cable Connector........................................................................... 12

Turning On Your System.................................................................................... 12

Status Light (LED) Diagnostics.......................................................................... 12

What's Next?.......................................................................................................13

Chapter 2 SC500 USB Controller Communications

Overview of USB Firmware Communications...................................................15

Communication Basics........................................................................................16

Receiving Reports from the Controller............................................................... 16

HID and Packed Touch Reports.......................................................................... 16

USB Command Set.............................................................................................18

Set Feature – Set Asynchronous Report.............................................................. 20

Set Feature – Calibration..................................................................................... 21

Get Feature – Get Status .....................................................................................23

Set Feature - Reset .............................................................................................. 25

Set Feature - Restore Defaults............................................................................. 25

Set Feature - Set Controller Number................................................................... 26

Get Feature – Get Controller Number................................................................. 27

Appendix A SC500 USB Controller Specifications

Technical Specifications ..................................................................................... 30

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Overview

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 small outline 3M Touch Systems
SC500 USB touch screen controller. This document includes information on
integrating the SC500 USB controller into your design, communicating with the
controller and troubleshooting setup problems. It also includes a complete description
of the firmware commands, a guide to interpreting status LED conditions, and
controller specifications.

What You Need to Know

This document assumes you are familiar with USB 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.

Intended Use

The SC500 USB controller was designed to enable touch in conjunction with other
3M Touch Systems products. This controller is not designed for use in hazardous
locations.

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 standards are

followed.

3M Touch Systems Proprietary Information

6 SC500 USB Controller Reference Guide

CAUTION

To reduce the risks associated with the improper disposal of the controller board,
which if not avoided may result in minor or moderate injury from ground water
contamination:

• Dispose of the controller board in accordance with local, state and federal regulations.

Explanation of Symbols

Attention: Read accompanying documentation

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.3mtouch.com/

drivers, obtain regularly updated technical documentation on 3M Touch Systems
products, and learn more about our company.

Note that if you purchased this product from another company, contact them before
contacting 3M Touch Systems.

, where you can download touch screen software and

Whenever you contact Technical Support, please provide the following information
(if applicable):

• Part number and serial number from your touch system

• 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
Saturdays and Sundays.

You can contact 3M Touch Systems Technical Support (US only -- Eastern Standard
Time) by calling the hot line, sending email or sending a fax.

• Technical Support Hot Line: 978-659-9200

• Technical Support Fax: [phone]

• Toll Free: 1-866-407-6666

• Email: [e-mail]

3M Touch Systems Proprietary Information

Overview 7

3M Touch Systems Worldwide Offices

All offices can be reached through the website: http://www.3Mtouch.com/.

• United States 978-659-9000

• United Kingdom [phone]

• Australia [phone]

• Canada 604-521-3962

• France [phone]

• Germany [phone]

• Hong Kong/China (852) 2333-6138

• Italy [phone]

• Japan [phone]

• Korea [phone]

• Singapore [phone]

• Spain [phone]

• Taiwan [phone]

3M Touch Systems Proprietary Information

CHAPTER 1

Integrating the SC500 USB Controller

The MicroTouch™ SC500 Universal Serial Bus (USB) controller is an accurate, small
outline, low cost, temperature stable controller capable of supporting a wide range of
3M Touch Systems resistive touch screens. It is designed to work with Microsoft®
Windows® XP, 2000, 98SE and Windows Me for internal mounting in OEM
applications.

This chapter covers the following SC500 USB controller specifications:

• Cable connections

• Mounting requirements

• Power requirements and options

• Status LED codes

Overview of the SC500 Touch Screen Controller

The SC500 controller is an uncased device using a USB interface.
To integrate and test the SC500 USB controller, you need the following items:

• A 3M Touch Systems 5-wire resistive touch screen. The touch screens are available in a
variety of sizes.

• A method of establishing the USB communication between the controller and your
system. The standard 3M Touch Systems USB communications cable (P/N7319420) is
recommended. This cable is PC99 compliant.

• A touch screen utility or driver with a calibration routine.
Note: You can use MicroTouch™ Software, which includes the touch screen device

driver and utilities software.

The controller measures 1.3 x 2.4 inches, or 1.3 x 2.7 inches total profile over the
connectors. Allow additional clearance for the mating connectors. The total height
profile is 0.40 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 SC500 has a 5-pin touch screen
connector (JP5), and a 5-pin USB cable connector (JP7).

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10 SC500 USB Controller Reference Guide

Figure 1. SC500 USB Controller Overall Dimensions

Handling and ESD Protection

When mounting the sensor and controller, use normal precautions for handling
electrostatic sensitive devices. The SC500 has internal protection to ±20 kV for ESD
air 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 SC500 USB Resistive Controller requires a 3M Touch Systems USB
communication cable (P/N 7319420) PC 99 compatible or an equivalent interconnect.
One end of this cable plugs into the USB connector (JP7) on the SC500 USB
Resistive Controller. The other end, which has a Type-A connector, plugs into a USB
port on your PC.

When creating a custom cable, use the Molex 51004-0500 mating connector. Table 1
describes the interconnections of the 3M Touch Systems USB cable.

Table 1. USB Cable for SC500 USB Resistive Controllers

PC Side (USB Type A) Wire Controller Side (5-Pin Molex)
Pin USB Assigned Color Pin Description

1 +5Vdc Red 1 +5Vdc Input Power
2 Data (DN) Gray 2 Data (DN) Differential Pair
3 Data (DP) Green 3 Data (DP) Differential Pair
4 0V Black 4 Power Return
5 Cable Shield Shell Charcoal

Gray

5 Outer Cable Shield around signal and

power lines. Chassis (earth) ground

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