M2256PW 3M, M2256PW Datasheet - Page 39

• Manufacturer Part Number: M2256PW
• Description: LCD Touch Panels 22 M2256PW 20 Point Multi-Touch
• Manufacturer: 3M
• Series: -r
• Type: Capacitiver

Specifications of M2256PW

• Length: 18.6" (473.8mm)
• Width: 20.2" (513.2mm)
• Height: 11.6" (296.1mm)
• Interface: USB/Serial
• Diagonal Screen Size: 22" (559mm)
• Lead Free Status / Rohs Status: Details

3M™ Display M2256PW User Guide
Table 20 Touch Data Format Settings
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.
Data Sequence
Status - Byte 1
X - Byte 2
X - Byte 3
Y - Byte 4
Y - Byte 5
ID – Byte 6
Note 1: P is the proximity bit. It is set to 1 when there is a touch, 0 for a liftoff.
3M Touch Systems, Inc. Proprietary Information
Bits
7
1
0
0
0
0
0
6
P
X6
X13
Y6
Y13
N6
1
5
0
X5
X12
Y5
Y12
N5
4
0
X4
X11
Y4
Y11
N4
3
0
X3
X10
Y3
Y10
N3
2
0
X2
X9
Y2
Y9
N2
1
0
X1
X8
Y1
Y8
N1
0
0
X0
X7
Y0
Y7
N0
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