EXII-7720SC 3M, EXII-7720SC Datasheet - Page 24

• Manufacturer Part Number: EXII-7720SC
• Description: CONTROLLER EX II SER CAPACITIVE
• Manufacturer: 3M
• Series: MicroTouch™ Controller EXr

Specifications of EXII-7720SC

• Accessory Type: Touch Screen - Controller
• Operating Supply Voltage: 5 VDC to 12 VDC
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: - 40 C
• Connector Type: RS232
• Rohs Compliant: Yes
• For Use With/related Products: Touch Screen Capacitive
• For Use With: 3M5754 - TOUCH SCREEN CAPACITIVE 12.31"3M5752 - TOUCH SCREEN CAPACITIVE 19.75"3M5750 - TOUCH SCREEN CAPACITIVE 20.65"3M5748 - TOUCH SCREEN CAPACITIVE 17.54"3M5747 - TOUCH SCREEN CAPACITIVE 6.71"3M5745 - TOUCH SCREEN CAPACITIVE 15.68"3M5744 - TOUCH SCREEN CAPACITIVE 10.83"3M5527 - TOUCH SCREEN CAPACITIVE 31.80"3M5526 - TOUCH SCREEN CAPACITIVE 20.65"3M5525 - TOUCH SCREEN CAPACITIVE 19.75"3M5524 - TOUCH SCREEN CAPACITIVE 17.54"3M5523 - TOUCH SCREEN CAPACITIVE 15.68"3M5522 - TOUCH SCREEN CAPACITIVE 12.31"3M5521 - TOUCH SCREEN CAPACITIVE 10.83"3M5520 - TOUCH SCREEN CAPACITIVE 8.75"3M5519 - TOUCH SCREEN CAPACITIVE 6.71"
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 3M5540

24
Description:
Response:
Bit
S0 – S5 Reserved
S6
Description
Proximity (touch state)
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.
<SOH>0<CR>
After the controller is in Calibrate Raw mode, the controller returns a response in the
following format:
SXxYy where:
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).
Table 7 Calibrate Raw Status Bits
= Status byte, first byte of data. Refer to Table 6.
3M Touch Systems, Inc. Proprietary Information
Values
—
1 = Sensor is being touched (a touchdown or a continued touch).
0 = Sensor is not being touched (a touch liftoff or inactive).
When the proximity bit changes from 1 to 0 (touch liftoff), the
controller outputs one final set of X/Y coordinate data with the bit
equal to 0 and the X/Y coordinate data equal to the last touch point.
MSB*
7
1
0
0
0
0
Positive response.
6
S6
X3
Xs** X9
Y3
Ys** Y9
5
Reserved
X2
Y2
3M™ MicroTouch™ Controller EX Serial Reference Guide
Bits
4
X1
X8
Y1
Y8
3
X0
X7
Y0
Y7
2
X6
Y6
Reserved
Reserved
1
X5
Y5
LSB*
0
X4
Y4