C2254PW 3M, C2254PW Datasheet - Page 26

• Manufacturer Part Number: C2254PW
• Description: LCD Touch Panels 22 C2254PW 10 Point Multi-Touch
• Manufacturer: 3M
• Series: -r
• Type: Capacitiver

Specifications of C2254PW

• Length: 18.6" (473.8mm)
• Width: 19.7" (500mm)
• Height: 11.6" (296.1mm)
• Interface: USB/Serial
• Diagonal Screen Size: 22" (559mm)
• Lead Free Status / Rohs Status: Details

26
Overview of USB Firmware Communications
Communication Basics
APPENDIX A
3M™ PX USB Controller Communications
This appendix is intended for software developers only and discusses the fundamentals of
communicating with the 3M™ PX controller. The firmware commands, which are
usually issued by a driver or utility program on the host system, control the operation of
the controller. This appendix lists the recommended firmware commands and describes
how to use each of these commands.
Developers may use this information 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.
Note: This document assumes you are familiar with USB standards and modes of
communication with USB 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 PX controller and simplify the development of
custom drivers, 3M Touch Systems recommends you use the commands listed in this
appendix for current development.
This section provides information on sending firmware commands to the controller and
interpreting the responses that the controller returns. The default operation of the PX
controller is USB Rev 2.0 full speed.
The USB command set is implemented by using vendor requests and vendor reports, i.e.,
vendor specific transactions. The controller issues some reports without prompting the
computer. The computer can also send requests to the controller to change how it
operates or receives information about the controller. The controller issues a synchronous
report in response to some of these requests.
3M Touch Systems, Inc. Proprietary Information -- 37732v04
3M™ Multi-Touch Chassis Display User Guide