M2256PW 3M, M2256PW Datasheet - Page 25

• 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
Get Feature - GetMaxCount
Table 9. Setup Stage
Table 7. Power On Check Bit Fields
Table 8. Valid Command Status Field Entries
POC Status – The status of the Power-on Checks. Various controller systems are
checked at power-up. If any failures in these systems are detected, a POC flag is set. The
POC status field reports the state of these flags.
Cmd Status – The status for the last command request. This field is used to determine
whether the last request was processed successfully. It is also used to track the progress
of a multi-stage request, such as 2 point calibration. The Status Request does not affect
the contents of this field, i.e., successful or unsuccessful processing of a previous status
request does not cause the command status field to be updated.
This is a request to send information that indicates the maximum number of simultaneous
touches supported by the controller.
Bit Number
0
1
2
3
4
5--7
Response
0
1
2
3
4
5
6 -- 7
Offset
0
1
2
4
6
Field
bmRequestType
bRequest
wValue
wIndex
wLength
Description
Failure in command processing
Command being processed
Stage 1 processing complete (for multi-stage commands)
Command complete
Soft Reset Occurred
Hard Reset Occurred
Not used
3M Touch Systems, Inc. Proprietary Information
Description
Not used
ROM_ERROR
PWM Error
NOV_ERROR
HDW_ERROR
Not used
Size
1
1
2
2
2
Notes
Code area checksum error
Touch screen not connected or potential problem
Parameter blocks checksum error
Problem with ADCs
Value
0xA1
0x01
0x0312
0
2
Description
Class,D2H,Interface
Get Report
msb=03=Feature
lsb=12 Feature Report ID
Always 0
Always 2
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