C2254PW 3M, C2254PW Datasheet - Page 27

• Manufacturer Part Number: C2254PW
• Description: LCD Touch Panels 22 C2254PW 10 Point Multi-Touch
• Manufacturer: 3M
• Series: -r
• Type: Capacitiver

Specifications of C2254PW

• Length: 18.6" (473.8mm)
• Width: 19.7" (500mm)
• Height: 11.6" (296.1mm)
• Interface: USB/Serial
• Diagonal Screen Size: 22" (559mm)
• Lead Free Status / Rohs Status: Details

3M™ Multi-Touch Chassis Display User Guide
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.
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.
Table 2. Calibration Setup Stage
Name
GetStatus
Calibrate
Reset
Restore Defaults
GetMaxCount
Offset
0
1
2
4
6
Field
bmRequestType
bRequest
wValue
wIndex
wLength
3M Touch Systems, Inc. Proprietary Information -- 37732v04
bmRequest
Type
0xA1 (D2H)
0x21 (H2D)
0x21 (H2D)
0x21 (H2D)
0xA1 (D2H)
Size
1
1
2
2
2
bRequest
0x01
0x01
0x09
0x09
0x09
Value
0x21
0x09
0x0303
0
8
Description
Class,H2D,Interface
Set Report
Msb 03 = Feature
Lsb 03 = Feature Report ID
Always 0
Always 8
Feature
Report ID
0x06
0x03
0x03
0x03
0x12
Report
Subtype
--
4
7
8
--
Data
Stage
Bytes
8
8
8
8
2
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