3M? Multi-touch Display M2256PW User Guide 37
3M Touch Systems, Inc. Proprietary Information – 37531 Rev D
3M Touch Systems recommends that the host system issue a Reset command whenever
the host system is powered on and is attempting to establish communication with the
controller.
The amount of time needed to execute a Reset command is typically 500 milliseconds
with a defined maximum of 2000 milliseconds. Therefore, the application program
should wait and be sure it receives the command response before issuing another
command to the controller following the reset.
Restore Defaults
Syntax: <SOH>RD<CR>
Response: <SOH>0<CR> Positive response.
Description: Returns to the factory default operating parameters. The Restore Defaults command
copies the 3M Touch Systems factory default parameters from ROM to the non-volatile
memory (NOVRAM) and then executes a Reset command.
The following table lists the factory defaults for the PX controller. The Restore Defaults
command is useful in situations where inadvertent commands to the controller have
rendered the sensor inoperative.
Table 18 PX Factory Default Settings
Operating Parameter
Default
Baud Rate 115,200
Serial Communication Settings N, 8, 1
Data Format Format Tablet Multitouch
Operating Mode Mode Stream
Return to Factory Calibration Yes
Note: After you issue a Restore Defaults command, you must recalibrate your sensor.
Unit Type
<SOH>UT<CR>
Responds with an 8-character identity string. This string identifies the type of controller
currently attached to the system, lists the features supported by the controller, and
outputs the status of the controller hardware (a self-test code).
Returns an identification code up to 8 ASCII characters in the following format:
<SOH>TtFfffSs<CR>
where:
Tt
= Two ASCII characters that identify the controller type.
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