20
3M™ MicroTouch™ Controller SX112 Reference Guide
3M Touch Systems, Inc. Proprietary Information
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:
S
=
Status byte, first byte of data. Refer to
Error! Reference source
not found.
6.
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
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
Table 7 describes the meaning of the bits in the status byte (Byte 1).
