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TIP-3526PCS-8 Scheda tecnica(PDF) 5 Page - Vishay Siliconix |
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TIP-3526PCS-8 Scheda tecnica(HTML) 5 Page - Vishay Siliconix |
5 / 9 page Document Number: 37026 Revision 05-Dec-00 www.vishay.com 6 TIP-3526PCS-8 Vishay Dale COMMAND/RESPONSE DESCRIPTION (Continued) Enable automatic reporting (29) *Disable automatic reporting (scan but no report) (2A) Request one coordinate report (2B) When AUTOMATIC REPORTING is enabled, coordinate reports are reported to the host as soon as they become available. After issuing the ENABLE AUTOMATIC REPORTING command, there may be a report in the internal buffer which is not current. If a sufficient amount of time has passed to allow this condition, the first coordinate report returned should be ignored. When AUTOMATIC REPORTING is disabled, no coordinate reports are reported unless requested with REQUEST ONE COORDINATE REPORT. If a stylus is entered into the touch panel after AUTOMATIC REPORTING is disabled, a coordinate report will be generated and saved in an internal buffer (depending upon coordinate reporting modes in effect) but will not be transmitted until a REQUEST ONE COORDINATE REPORT command is received. If no coordinate report is available in the internal buffer, the touch panel will return a code 48 and continue to scan until a stylus is detected. However, no coordinate report will be reported until AUTOMATIC REPORTING is enabled or the report is requested with REQUEST ONE COORDINATE REPORT. Coordinate reports are reported with the following format: Report Type = 41, 42, 43 or 4E xx yy = binary X and Y, > = 0, X, Y = FE if non-contiguous Enable beeper (2D) *Disable beeper (2E) Enabling the beeper sends a logic 0 (active state) to pin 2 of J4 depending on which of the coordinate reporting modes are enabled. If the ENTER mode is enabled, a pulse is sent for every entry point. If the EXIT mode is enabled, a pulse is sent for every exit point. If both modes are enabled, a pulse is sent for every entry and exit point. CONTINUOUS and TRACKING modes have no beeper outputs. Sound beeper, tt = duration (00 to FF) (2Ftt) This command sends a logic 0 (active state) to pin 2 of J4. The duration of the beep can be controlled in 10 msec increments from 0 msec (00) to 2.55 sec (FF). Note: 2C may not be used as an argument as it will cause a reset. *Normal X (36) Invert X (37) *Normal Y (38) Invert Y (39) The standard configuration for the touch panel places the XY origin at the lower left corner, consistent with the Cartesian coordinate system. Upon issuing the INVERT Y command, the origin becomes the upper left corner, consistent with the video industry standard. These commands allow the user to move the origin to any corner to accommodate different standards or third party mechanical packages which may have the touch panel rotated 180 degrees on the display. To cancel an INVERT X or INVERT Y command, a NORMAL X or NORMAL Y command must be executed. These commands may also be implemented with jumpers. Placing a shunt on Jumper B (NOR X) causes X data to be normal (default) and removing the shunt causes inverted X Request failed beam report (28) This command returns the address of any infrared diode/ phototransistor pair that are blocked (as when a stylus is in the panel) or have several failed scans. (The time period can be extended by using the FAILED BEAM TIME-OUT command.) The report uses the following format: 47 = start of failed beam report aa - nn = physical address of failed LED/ Phototransistor pair FF = end of report Reset touch panel (2C) After issuing the RESET command, the touch panel is returned to its power up condition and all operating modes are returned to their default state and the buffer cleared. If autobaud is being used the correct baud rate must again be established. Request software revision number (30) Request touch matrix size (33) Request model number (35) These commands are provided for configuration control and diagnostic purposes. RS-232 framing or overrun error (45) An RS-232 error indicates communication problems. Buffer over flow error (4F) Buffer overflow occurs when the input command buffer is exceeded to lack of handshaking. data. Similarly, placing a shunt on Jumper C (NOR Y) causes Y data to be normal (default) or removal causes inverted Y data. The jumper selected options may be overridden with the software commands. Failed beam time-out (3A t) If any IR beam is broken for an extended time due to blockage of the beam or failed optical components, the touch panel will ignore that beam after a predetermined number of scans. (This is to prevent failed beams from interfering with touch sensing.) The actual failed beam detection time depends on the modes of operation and the size of the touch matrix. When using the CONTINUOUS mode with AUTOMATIC REPORTING enabled, the time is typically 25 - 30 seconds. If the application requires longer touch times, then the time may be extended using the FAILED BEAM TIME-OUT command. The command accepts arguments from 1 to F. INITIALIZATION Initialization is performed by the host computer and must be done each time the touch panel is powered up or the RESET TOUCH PANEL command is issued. The process begins with baud rate selection (if not jumper selected). The remainder of the initialization process requires setting the desired coordinate reporting modes, enabling or disabling AUTOMATIC REPORTING, enabling or disabling the beeper, and enabling or disabiling the touch panel. Default settings are shown in the COMMANDS table. When touch coordinate information is required by the host computer, the touch panel must be enabled. The flow of touch coordinates from the touch panel to the host computer can be controlled by enabling or disabling AUTOMATIC REPORTING. With AUTOMATIC REPORTING enabled, coordinate reports are sent to the host as soon as they become available. If the host computer is performing a task which does not require touch coordinate information, AUTOMATIC REPORTING may be disabled. |
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