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Another standard response is 1 (ASCII character 'one' or 31 hexadecimal). In most cases,
this response indicates the command failed. The controller received an invalid command
that it could not execute.
Some possible reasons for a command failure include:
•
The command was not formatted correctly.
•
The system parameters were not set up to allow command execution.
•
The controller does not support the command.
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 chapter, 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 EX 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.
Most touch systems users do not have to use firmware commands to use their touch
systems. For example, users can use 3M™ MicroTouch™ Software to calibrate the
sensor or to determine the controller type and firmware version.
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 the
following table for current development. Using these commands ensures compatibility
with all 3M™ MicroTouch™ controllers.
Note: When you enter commands in terminal mode, precede each command with
<CTRL> A to enter the start of header.
3M Touch Systems, Inc. Proprietary Information – TSD-40848A
3M™ MicroTouch™ Controller EX Dual Mode Reference Guide
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