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.
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.
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.
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
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