38
3M™ MicroTouch™ Controller EX Dual Mode Reference Guide
3M Touch Systems, Inc. Proprietary Information – TSD-40848A
Table 24. General Packet Formats
Byte
Bits 0 – 7
1
b0 – b6: Reserved
b7: Synchronization bit (Always 1)
2-6
I component of upper left (UL) corner
7-11
Q component of upper left (UL) corner
12-16 I component of upper right (UR) corner
17-21 Q component of upper right (UR) corner
22-26 I component of lower left (LL) corner
27-31 Q component of lower left (LL) corner
32-36 I component of lower right (LR) corner
37-41 Q component of lower right (LR) corner
Table 25. I/Q Corner Components
Byte
Bits 0 – 7
N
b0 – b6: bits 25-31 of respective I/Q corner data
b7: Always 0
N+1
b0 – b6: bits 18-24 of respective I/Q corner data
b7: Always 0
N+2
b0 – b6: bits 11-17 of respective I/Q corner data
b7: Always 0
N+3
b0 – b6: bits 4-10 of respective I/Q corner data
b7: Always 0
N+4
b0 – b3: bits 0-3 of respective I/Q corner data
b4 – b7: Always 0
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> Positive
response.
With the controller in Format Tablet mode, touching the sensor causes the controller to
return a response in the following format:
SXxYy
