3M M2256PW User Manual - Page 22

22 3M™ Display M2256PW User Guide You need to know product ID (0502H) and the vendor ID (0596H) to write your own driver. These values are required for identifying the controller. Receiving Reports from the Controller The controller sends a variety of reports to the computer. The first byte of each report is the Report ID that defines the structure and content of the report. The controller sends some reports as a direct response to a computer request (synchronous). The controller will also send some reports as the result of an external event, such as a touch (asynchronous). Command Set The USB command set is implemented by using HID Get Feature and Set Feature commands. The various requests and reports are grouped together by report size under a common feature ID. HID Class Requests The following table summarizes the available HID class requests. Table 1. HID Class Requests Summary HID Report Command Name bmRequest Type Get Feature Set Feature Set Feature Set Feature Get Feature GetStatus Calibrate Reset Restore Defaults GetMaxCount 0xA1 (D2H) 0x21 (H2D) 0x21 (H2D) 0x21 (H2D) 0xA1 (D2H) bRequest 0x01 0x09 0x09 0x09 0x01 Feature Report ID 0x06 0x03 0x03 0x03 0x12 Report Subtype -4 7 8 -- Data Stage Bytes 8 8 8 8 2 Set Feature - Calibration This is a command to do a Calibrate Extended style calibration. The controller will autoorient on this 2 point calibration. 3M Touch Systems, Inc. Proprietary Information