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Table 24. General Packet Formats
Byte
1
2-6
7-11
12-16
17-21
22-26
27-31
32-36
37-41
Table 25. I/Q Corner Components
Byte
N
N+1
N+2
N+3
N+4
Format Tablet
Syntax:
<SOH>FT<CR>
Description:
Outputs the X/Y touch coordinate data in a 5-byte packet. The packet includes 1 status
byte and 4 bytes of binary X/Y coordinate data. The protocol also establishes the X and Y
coordinate output as 14 binary bits providing a range of 0 to 16,383.
The low order bits (X3 – X0 and Y3 – Y0) are not significant in a 1024 by 1024 sensor
because data can fluctuate with each touch, and therefore may not be completely
accurate.
To use Format Tablet, the controller and host system must be in an 8-bit data
communication mode. The Format Tablet command returns a negative response if the
controller is in 7-bit format.
Response:
<SOH>0<CR>
With the controller in Format Tablet mode, touching the sensor causes the controller to
return a response in the following format:
SXxYy
Bits 0 – 7
b0 – b6: Reserved
b7: Synchronization bit (Always 1)
I component of upper left (UL) corner
Q component of upper left (UL) corner
I component of upper right (UR) corner
Q component of upper right (UR) corner
I component of lower left (LL) corner
Q component of lower left (LL) corner
I component of lower right (LR) corner
Q component of lower right (LR) corner
Bits 0 – 7
b0 – b6: bits 25-31 of respective I/Q corner data
b7: Always 0
b0 – b6: bits 18-24 of respective I/Q corner data
b7: Always 0
b0 – b6: bits 11-17 of respective I/Q corner data
b7: Always 0
b0 – b6: bits 4-10 of respective I/Q corner data
b7: Always 0
b0 – b3: bits 0-3 of respective I/Q corner data
b4 – b7: Always 0
Positive response.
3M Touch Systems, Inc. Proprietary Information – TSD-40848A
3M™ MicroTouch™ Controller EX Dual Mode Reference Guide
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