3M M2256PW User Manual - Page 29

3M™ Display M2256PW User Guide 29 APPENDIX B 3M™ PX Serial Controller Communications This appendix is intended for software developers only and discusses the fundamentals of communicating with the 3M™ PX serial controller. The firmware commands, which are usually issued by a driver or utility program on the host system, control the operation of the controller; however developers can enter these commands directly. This appendix: • 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. 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™ PX controller and simplify the development of custom drivers, 3M Touch Systems recommends you use the commands listed in this appendix for current development. Controller Default Settings Communication Parameters The operation of the PX serial controllers is N81 (no parity, 8 data bits, and 1 stop bits) at 115,200 baud (nonadjustable). 3M Touch Systems, Inc. Proprietary Information