3M M2256PW User Manual - Page 27

3M™ Display M2256PW User Guide 27 Table 13. Restore Defaults -- Setup Stage Offset 0 1 2 Field bmRequestType bRequest wValue 4 wIndex 6 wLength Size 1 1 2 2 2 Value 0x21 0x09 0x0303 0 8 Description Class,H2D,Interface Set Report msb=03=Feature lsb=03= Feature Report ID Always 0 Always 8 Table 14. Restore Defaults - Data Stage Offset 0 1 2-7 Field Report ID Report Subtype Size 1 1 6 Value 0x03 0x08 0 Description Feature Report ID Restore Defaults Not used After sending this command, the controller will acknowledge (ACK) the transfer, but the command will not yet be completed. Before sending any other commands, the host should poll with GetStatus until the command status field returns "Command Complete" or "Fail". Any timeout for this status polling should be 2 seconds minimum. Asynchronous Reports Coordinate Data - MultiTouch Digitizer mode Async Report 0x13 This is used to transfer the coordinate data to the host. This report, when activated, is sent to the host whenever new data is available/scheduled for transmission. It is an asynchronous report that is activated by default at power up. See SetAsyncReport for details on how to activate/deactivate an asynchronous report. The report shown supports up to 6 simultaneous touches. Note that if more than 6 touches were to be supported, Report 0x13 would be sent as many times as necessary to accommodate the number of fingers touching. Only the first Report 0x13 will have a nonzero actual count. Each valid touch is marked with an ID number that remains the same from touchdown thru liftoff. The ID number can be any value from 0 to 255. Ignore all other data within a touch report structure with a status marked "not valid". The coordinate system is Upper Left origin. Table 15. Coordinate Data Report 0x13 --Data Stage Offset 0 1 11 21 31 41 Field Report ID Touch Report Touch Report Touch Report Touch Report Touch Report Size 1 10 10 10 10 10 Value 0x13 See table 16 See table 16 See table 16 See table 16 See table 16 Description Report ID Touch Report Structure Touch Report Structure Touch Report Structure Touch Report Structure Touch Report Structure 3M Touch Systems, Inc. Proprietary Information