EXII-7720SC 3M, EXII-7720SC Datasheet - Page 25

• 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

3M™ MicroTouch™ Controller EX Serial Reference Guide
Bit
S7
Diagnostic Command
Syntax:
Description:
Response:
Format Raw
Syntax:
Description:
Response:
Description
Packet synchronization
<SOH>DX<CR>
This command requests that the controller check for sensor failures such as broken
corners, broken wires, etc.
<SOH>0<CR>
<SOH>1<CR>
<SOH>2<CR>
<SOH>FR<CR>
Returns the signal level (amount of touch) of each of the four sensor corners in digital
format. The returned values are not corrected for stray values.
The Format Raw data is a 41-byte packet that includes 1 status byte and 40 bytes of
binary corner data. The first byte of each packet always has its high bit (Bit 7) set to
provide synchronization with the host system. Refer to Table 8 for General Packet
Formats. Each corner data is composed of a pair of 32-bit I and Q values, which are
delivered in 10 bytes.
I and Q are complex touch currents as measured in phase and 90 degrees out of phase
with the corner drive signal. Refer to Table 9 for I/Q Corner Components.
To use the Format Raw command, the controller and host system must be in an 8-bit data
communication mode. The Format Raw command returns a negative response if the
controller is not using an 8-bit communication mode.
To terminate Format Raw, issue a Reset command. The controller may return several
bytes of data between the time you issue a Reset command and the controller receives it.
You can either scan the data stream for the Reset acknowledgment, or you can ignore the
response to the first Reset command and then issue a second Reset after approximately 10
seconds has passed.
Use the Format Raw command for diagnostics. Use Format Tablet for standard sensor
operation.
<SOH>0<CR>
After the controller is in Format Raw mode, the controller returns a continuous response
in the following format:
<41-byte-packet><41-byte-packet>...<41-byte-packet>...
3M Touch Systems, Inc. Proprietary Information
Values
Always 1.
Positive response.
Command not supported.
Failure detected.
Positive response.
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