C2254PW 3M, C2254PW Datasheet - Page 30

• 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

30
Get Feature - GetMaxCount
Table 9. Setup Stage
Table 10. Data Stage (controller response)
Table 7. Power On Check Bit Fields
Table 8. Valid Command Status Field Entries
Command 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.
Note: The number of actual contacts reported may exceed this number.
Bit Number
0
1
2
3
4
5--7
Response
0
1
2
3
4
5
6 -- 7
Offset
0
1
2
4
6
Offset
0
1
Field
bmRequestType
bRequest
wValue
wIndex
wLength
Field
Report ID
Max Count
3M Touch Systems, Inc. Proprietary Information -- 37732v04
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
Description
Not used
ROM_ERROR
PWM Error
NOV_ERROR
HDW_ERROR
Not used
Size
1
1
2
2
2
Size
1
1
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
Value
0x12
0x1E
3M™ Multi-Touch Chassis Display User Guide
Description
Class,D2H,Interface
Get Report
msb=03=Feature
lsb=12 Feature Report ID
Always 0
Always 2
Description
Feature Report ID
Number of actual fingers supported