3M M2256PW Benutzerhandbuch

3M™ Multi-touch Display M2256PW User Guide 

 

27 

3M Touch Systems, Inc. Proprietary Information – 37531 Rev D

This is a request to restore parameter defaults. 

0 bmRequestType 

1 

0x21 

Class,H2D,Interface 

1 bRequest  1 

0x09 

Set 

Report 

2 wValue 

2 

0x0303 

msb=03=Feature 

 

lsb=03= Feature Report ID  

4 wIndex 

2 

0 Always 

0 

6 wLength 

2 

8 Always 

8 

0 

Report ID 

1 

0x03 

Feature Report ID 

1 

Report Subtype 

1  

0x08 

Restore Defaults 

2-7  

6 0  Not 

used 

After sending this command, the controller will acknowledge (ACK) the transfer, but the 
command will not yet be completed. Before sending any other commands, the host 
should poll with GetStatus until the command status field returns “Command Complete” 
or “Fail”.  Any timeout for this status polling should be 2 seconds minimum. 

This is used to transfer the coordinate data to the host.  This report, when activated, is 
sent to the host whenever new data is available/scheduled for transmission. It is an 
asynchronous report that is activated by default at power up. See SetAsyncReport for 
details on how to activate/deactivate an asynchronous report.    

The report shown supports up to 6 simultaneous touches.  Note that if more than 6 
touches were to be supported, Report 0x13 would be sent as many times as necessary to 
accommodate the number of fingers touching. Only the first Report 0x13 will have a 
non-zero actual count. Each valid touch is marked with an ID number that remains the 
same from touchdown thru liftoff. The ID number can be any value from 0 to 255. Ignore 
all other data within a touch report structure with a status marked “not valid”.   

The coordinate system is Upper Left origin.