M2256PW 3M, M2256PW Datasheet - Page 27

• 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

3M™ Display M2256PW User Guide
Table 13. Restore Defaults -- Setup Stage
Table 14. Restore Defaults - Data Stage
Asynchronous Reports
Table 15. Coordinate Data Report 0x13 --Data Stage
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.
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 non-
zero 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.
Offset
0
1
2
4
6
Offset
0
1
2-7
Offset
0
1
11
21
31
41
Field
bmRequestType
bRequest
wValue
wIndex
wLength
Field
Report ID
Report Subtype
Field
Report ID
Touch Report
Touch Report
Touch Report
Touch Report
Touch Report
3M Touch Systems, Inc. Proprietary Information
Size
1
10
10
10
10
10
Size
1
1
2
2
2
Size
1
1
6
See table 16
See table 16
See table 16
See table 16
See table 16
Value
0x13
0x08
Value
0x21
0x09
0x0303
0
8
Value
0x03
0
Description
Class,H2D,Interface
Set Report
msb=03=Feature
lsb=03= Feature Report ID
Always 0
Always 8
Description
Feature Report ID
Restore Defaults
Not used
Description
Report ID
Touch Report Structure
Touch Report Structure
Touch Report Structure
Touch Report Structure
Touch Report Structure
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