M2256PW 3M, M2256PW Datasheet - Page 32

• Manufacturer Part Number: M2256PW
• Description: LCD Touch Panels 22 M2256PW 20 Point Multi-Touch
• Manufacturer: 3M
• Series: -r
• Type: Capacitiver

Specifications of M2256PW

• Length: 18.6" (473.8mm)
• Width: 20.2" (513.2mm)
• Height: 11.6" (296.1mm)
• Interface: USB/Serial
• Diagonal Screen Size: 22" (559mm)
• Lead Free Status / Rohs Status: Details

32
Firmware Commands
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.
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
Calibrate
Get Copyright
Mode Down Up
Mode Inactive
Mode Stream
Name
Null Command
Output Identity
Reset
Restore Defaults
Unit Type
3M Touch Systems, Inc. Proprietary Information
Code
CX
Q101
MDU
MI
MS
NM
Z
OI
R
RD
UT
Description
Initiates an interactive 2-point calibration.
Returns the copyright string.
Reports touchdowns and liftoffs only.
Turns off touch reports.
Default mode. Streaming touch reports.
Returns a controller identifier string.
Returns an ACK. No effect.
Returns Identity string: ADxxxx
Resets certain modes and gets a new baseline.
Restores default settings.
Returns the Status string: AD****ss.
3M™ Display M2256PW User Guide