3M M2256PW Benutzerhandbuch
3M™ Multi-touch Display M2256PW User Guide
25
3M Touch Systems, Inc. Proprietary Information – 37531 Rev D
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.
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.
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
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.
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