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20
Calibrate Raw
Syntax:
<SOH>CR<CR>
Description:
Allows the collection of raw (signed) X and Y coordinates before the normal scaling,
linearization, and filtering processes. The controller sends a continuous stream of data in
Calibrate Raw mode.
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, the controller returns a response in the
following format:
SXxYy where:
= Status byte, first byte of data. Refer to Error! Reference source
S
Xx = X (horizontal) coordinate data; second and third bytes of data
Yy = Y (vertical) coordinate data; fourth and fifth bytes of data.
Table 6 Data Sequence
Data Sequence
S- Byte 1
X- Byte 2
x- Byte 3
Y- Byte 4
y- Byte 5
*MSB = Most Significant Bit, LSB = Least Significant Bit
** s = sign bit
Table 7 describes the meaning of the bits in the status byte (Byte 1).
not found.6.
MSB*
7
6
1
S6
0
X3
0
Xs** X9
0
Y3
0
Ys** Y9
3M Touch Systems, Inc. Proprietary Information
3M™ MicroTouch™ Controller SX112 Reference Guide
Bits
5
4
3
Reserved
X2
X1
X0
X8
X7
Y2
Y1
Y0
Y8
Y7
LSB*
2
1
0
Reserved
X6
X5
X4
Reserved
Y6
Y5
Y4
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