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EX II 3000SP Controller Communications 25
3M Touch Systems Proprietary Information
No Response <SOH>2<CR>
Indicates that the user did not touch the target long enough to provide an
accurate calibration point.
Calibrate Raw
Syntax: <SOH>CR<CR>
Description: Allows the collection of raw (signed) X and Y coordinates prior to the
normal scaling, linearization, and filtering processes. The controller sends
the coordinates whenever a touch is detected and continues to send a stream
of data as long as a finger remains in contact with the touch screen.
The Calibrate Raw data is a 5-byte packet that includes 1 status byte and 4
bytes of binary X/Y coordinate data. Each X/Y coordinate includes 10
binary bits and 1 sign bit. The 10 bits represent coordinates within a range
of -1024 to +1023.
To use the Calibrate Raw command, the controller and host system must be
in an 8-bit data communication mode. The Calibrate Raw command returns
a negative response if the controller is not using an 8-bit communication
mode.
To end Calibrate Raw mode, issue a Reset command. 3M Touch Systems
uses the Calibrate Raw command during manufacturing and testing, and
recommends you only use this command for diagnostics when you want raw
data.
Response: <SOH>0<CR> Positive response
After the controller is in Calibrate Raw mode, touching the screen causes
the controller to return a response in the following format:
SXxYy where:
S = Status byte, first byte of data. Refer to Table 4.
Xx = X (horizontal) coordinate data; second and third bytes of data
Yy = Y (vertical) coordinate data; fourth and fifth bytes of data.
Table 4 Data Sequence
MSB* Bits LSB*
Data Sequence 7 6 5 4 3 2 1 0
S- Byte 1 1 S6 Reserved
X- Byte 2 0 X3 X2 X1 X0 Reserved
x- Byte 3 0 Xs** X9 X8 X7 X6 X5 X4
Y- Byte 4 0 Y3 Y2 Y1 Y0 Reserved
y- Byte 5 0 Ys** Y9 Y8 Y7 Y6 Y5 Y4
*MSB = Most Significant Bit, LSB = Least Significant Bit
** s = sign bit