3M EX II 3000SP 用户手册
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.
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.
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.
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.
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.
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:
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
** s = sign bit