3M M2256PW manual Receiving Reports from the Controller, Command Set, Set Feature Calibration

22 3M™ Multi-touch Display M2256PW User Guide

synchronous report in response to some of these requests.

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		bmRequest		bRequest		Feature		Report	Data
		Name		Type				Report ID		Subtype	Stage
											Bytes
Get Feature	GetStatus		0xA1 (D2H)		0x01			0x06	--		8
Set Feature	Calibrate		0x21 (H2D)		0x09		0x03		4		8
Set Feature	Reset		0x21 (H2D)		0x09			0x03	7		8
Set Feature	Restore Defaults		0x21 (H2D)		0x09		0x03		8		8
Get Feature	GetMaxCount		0xA1 (D2H)			0x01		0x12	--		2

Set Feature - Calibration

This is a command to do a Calibrate Extended style calibration. The controller will auto- orient on this 2 point calibration.

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