3M
™ Multi-Touch ASIC Controller Reference Guide
33
3M Touch Systems, Inc. Proprietary Information
Table 27. PX5nnn 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.
Soft Reset
Syntax:
<SOH>
R
<CR>
Response:
<SOH>
0
<CR>
Positive response.
Description:
Initializes the hardware and the firmware, causes the controller to stop sending data, and
recalculates the environmental conditions (for example, stray and offset values). The
Reset command also cancels the Calibrate command and returns the controller to normal
operation.
Unit Type
Syntax:
<SOH>
UT
<CR>
Description:
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.
AD
Indicates the
PX5nnn
series of controllers
Ffff
= Four ASCII characters that indicate the features supported by the
controller.
**** Indicates no additional features configured
Ss
= Two ASCII characters that provide status information about the
controller hardware. The two characters represent one byte. Each
character is in the range 0 to 9 and A to F.
Table 2 defines the meaning of each bit in the status byte. Each bit
can be set to 1 or 0, where
1
= an error and
0
= no error. So a
response of:
00
= No diagnostic errors (normal response)
The PX5nnn running with no errors returns the following string:
<SOH>
AD****00
<CR>
The format includes two bitmapped ASCII hex status bytes. A “00” indicates no errors.
