3M M2256PW manual Data Sequence, Bits

3M™ Multi-touch Display M2256PW User Guide 39

Data Sequence	Bits
	7	6	5	4	3	2	1	0
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.

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