32
3M™ Display M2256PW User Guide
3M Touch Systems, Inc. Proprietary Information
The
terminator
is the last character of each response string and is an ASCII carriage
return CR. The hexadecimal code for the ASCII CR control character is 0D hexadecimal.
The value returned in the response will be the ASCII control character for a carriage
return, displayed on the screen as the cursor moving to the next line.
In this appendix, responses are shown as a string of ASCII characters consisting of a
header, the response, and a terminator as follows:
<SOH>
Response
<CR>
Controller Initialization
To initialize the PX serial controller for new development, 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.
Firmware Commands
Developers may use this information when writing touch applications, developing custom
drivers or touch configurations, or testing their touch systems. Developers can use
firmware commands to initialize the controller, select operating modes, specify data
formats, and execute diagnostic functions.
Caution:
This document assumes you are familiar with firmware commands and how to
use them. Executing some commands may alter the performance of your touch system
and render it inoperable. You should be aware of the results before executing any
firmware commands.
To optimize the performance of the touch controller and simplify the development of
custom drivers, 3M Touch Systems recommends you use the commands listed in Table
17 for current development. Using these commands ensures compatibility with all 3M™
controllers.
Note:
When you enter commands in terminal mode, precede each command with
<CTRL> A to enter the start of header.
Table 17. Firmware Commands for PX Serial Controller Development
Command
Code
Description
Calibrate
CX
Initiates an interactive 2-point calibration.
Get Copyright
Q101
Returns the copyright string.
Mode Down Up
MDU
Reports touchdowns and liftoffs only.
Mode Inactive
MI
Turns off touch reports.
Mode Stream
MS
Default mode. Streaming touch reports.
Name
NM
Returns a controller identifier string.
Null Command
Z
Returns an ACK. No effect.
Output Identity
OI
Returns Identity string: ADxxxx
Reset
R
Resets certain modes and gets a new baseline.
Restore Defaults
RD
Restores default settings.
Unit Type
UT
Returns the Status string: AD****ss.