3M C3266PW 사용자 설명서
3M™ Multi-Touch Chassis Display User Guide
37
3M Touch Systems, Inc. Proprietary Information – TSD-39373 REV E
Table 7. Power On Check Bit Fields
Bit Number
Description
Notes
0
Not used
1
ROM_ERROR
Code area checksum error
2
PWM Error
Touch screen not connected or potential problem
3
NOV_ERROR
Parameter blocks checksum error
4
HDW_ERROR
Problem with ADCs
5--7
Not used
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.
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.
Table 8. Valid Command Status Field Entries
Response
Description
0
Failure in command processing
1
Command being processed
2
Stage 1 processing complete (for multi-stage commands)
3
Command complete
4
Soft Reset Occurred
5
Hard Reset Occurred
6 -- 7
Not used
Get Feature - GetMaxCount
This is a request to send information that indicates the maximum number of
simultaneous touches supported by the controller.
simultaneous touches supported by the controller.
Table 9. Setup Stage
Offset Field
Size
Value
Description
0
bmRequestType
1
0xA1
Class,D2H,Interface
1
bRequest
1
0x01
Get Report
2
wValue
2
0x0312 msb=03=Feature
lsb=12 Feature Report ID
4
wIndex
2
0
Always 0
6
wLength
2
2
Always 2
Table 10. Data Stage (controller response)
Offset Field
Size
Value
Description
0
Report ID
1
0x12
Feature Report ID
1
Max Count
1
0x1E
Number of actual fingers supported
Note:
The number of actual contacts reported may exceed this number.