3M C3266PW User's Guide download pdf (Page 35)

3M™ Multi-Touch Chassis Display User Guide 35

3M Touch Systems, Inc. Proprietary Information – TSD-39373B

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.

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

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.

1 2 ... 30 31 32 33 34 35 36 37 38 39 40 ... 53 54

No comments

3M C3266PW User's Guide Page 35