M2256PW 3M, M2256PW Datasheet - Page 22

• Manufacturer Part Number: M2256PW
• Description: LCD Touch Panels 22 M2256PW 20 Point Multi-Touch
• Manufacturer: 3M
• Series: -r
• Type: Capacitiver

Specifications of M2256PW

• Length: 18.6" (473.8mm)
• Width: 20.2" (513.2mm)
• Height: 11.6" (296.1mm)
• Interface: USB/Serial
• Diagonal Screen Size: 22" (559mm)
• Lead Free Status / Rohs Status: Details

22
Receiving Reports from the Controller
Command Set
Table 1. HID Class Requests Summary
Set Feature - Calibration
HID Report Command
Get Feature
Set Feature
Set Feature
Set Feature
Get Feature
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.
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).
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.
This is a command to do a Calibrate Extended style calibration. The controller will auto-
orient on this 2 point calibration.
Name
GetStatus
Calibrate
Reset
Restore Defaults
GetMaxCount
3M Touch Systems, Inc. Proprietary Information
bmRequest
Type
0xA1 (D2H)
0x21 (H2D)
0x21 (H2D)
0x21 (H2D)
0xA1 (D2H)
bRequest
0x01
0x01
0x09
0x09
0x09
Feature
Report ID
0x06
0x03
0x03
0x03
0x12
3M™ Display M2256PW User Guide
Report
Subtype
--
4
7
8
--
Data
Stage
Bytes
8
8
8
8
2