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3M™ Display M2256PW User Guide
39
3M Touch Systems, Inc. Proprietary Information
Table 20 Touch Data Format Settings
Bits
Data Sequence
7
6
5
4
3
2
1
0
Status - Byte 1
1
P
1
0
0 0 0 0
0
X
-
Byte
2
0 X6 X5 X4 X3 X2 X1 X0
X
-
Byte
3
0
X13 X12 X11 X10 X9 X8 X7
Y
-
Byte
4
0 Y6 Y5 Y4 Y3 Y2 Y1 Y0
Y
-
Byte
5
0
Y13 Y12 Y11 Y10 Y9 Y8 Y7
ID
–
Byte
6
0 N6 N5 N4 N3 N2 N1 N0
Note 1: P is the proximity bit. It is set to 1 when there is a touch, 0 for a liftoff.
The ID is associated with a touch stream from one finger. The ID, in the range of 0-127,
is assigned on a rotating basis at touchdown. A finger touch stream consists of a
touchdown, maybe some continuing touch points, ending with a liftoff. The ID is
released on liftoff, and becomes available to be reassigned.
When multiple fingers are down, the packets from the touch streams are sent interleaved.
There is no order imposed on the interleave.