3M M2256PW manual Controller Default Settings, Communicating with the Controller, Data Format

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3M™ Multi-touch Display M2256PW User Guide

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).

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 Multitouch is the default format for the 3M™ PX serial controller. In Format Tablet Multitouch, the controller sends 6 bytes per point and provides the most rapid response time to a touch.

Refer to the Format Tablet Multitouch 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 PX serial 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 Table 17 are those that 3M Touch Systems currently uses for development. 3M Touch Systems recommends that you use only these commands for 3M™ PX serial 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.

3M Touch Systems, Inc. Proprietary Information – 37531 Rev D

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Contents 3M Touch Systems, Inc. Proprietary Information 37531 Rev D 3M Multi-touch Display M2256PW User Guide Contents Appendix a 3M PX USB Controller Communications Appendix B 3M PX Serial Controller CommunicationsAppendix C Regulatory Information Overview Important Safety InformationIntroduction Intended UseExplanation of Signal Word Consequences Important Notes Maintaining Your Touch DisplayTouch Sensor Care and Cleaning 3M Touch Systems Support ServicesContact 3M Touch Systems Setting up Your M2256PW Multi-touch Display System RequirementsUnpacking Your Touch Display Cables Included with Your M2256PW Multi-touch DisplayConnecting the Touch Display Testing the M2256PW Multi-touch DisplayArm Mounting Option Video Card Requirements Using the Standard Controls for the Video CardApplicable Display Mode and Refresh Rate Refresh Rate Hz Supported Video Display Modes and Refresh RatesAccess to the Video Controls Configuring the Display SettingsMultimedia Features Menu/Select Down Up Auto/Exit Power LEDAdjusting the M2256PW Video Display Choices DescriptionAudio Tools All Other Platforms Enabling Your M2256PW Multi-touch DisplayWindows 7 USB Compatibility Multitouch Application SupportInstalling 3M MicroTouch Software Video Alignment3M Multi-touch Display M2256PW User Guide 3M PX USB Controller Communications Overview of USB Firmware CommunicationsCommunication Basics Receiving Reports from the Controller Command SetSet Feature Calibration HID Class RequestsDetermining Target Areas Calibration Setup Stage Offset Field Size Value DescriptionCalibration Response Command Status Byte Description Data Stage Offset Field Size Value DescriptionGet Feature GetStatus Valid Command Status Field Entries Response Description Get Feature GetMaxCountPower On Check Bit Fields Bit Number Description Setup Stage Offset Field Size Value DescriptionSet Feature Reset Reset Setup Stage Offset Field Size Value DescriptionReset Data Stage Offset Field Size Value Description Asynchronous Reports Set Feature -Restore DefaultsCoordinate Data MultiTouch Digitizer mode Async Report Offset Field Size Value DescriptionTouch Report Structure Offset Field Value DescriptionOverview of Firmware Commands 3M PX Serial Controller CommunicationsCommunicating with the Controller Controller Default SettingsOperating Mode Communication ParametersSending Commands to the Controller Receiving Responses from the ControllerFirmware Commands Controller InitializationMDU Command Code DescriptionCalibrate SOH CxcrGuidelines for Calibrate Command Calibrate ProcedureMode Stream Mode Down UpMode Inactive Get CopyrightSoft Reset Name CommandNull Command Output IdentityUnit Type Restore DefaultsOperating Parameter Default SOH RdcrTouch Data Format Bit DescriptionData Sequence Bits Data Sequence Bits Regulatory Information Regulatory Agency ApprovalsFCC-B FCC Warning CE Conformity for Europe
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