SC402S datasheet(15/29 Pages) 3M

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3M™ MicroTouch™ Controller RX142 Reference Guide

3M Touch Systems, Inc. Proprietary Information

CHAPTER 2

RX142 Controller Communications

This chapter discusses the fundamentals of communicating with the RX142 controller.

The firmware commands, which are usually issued by a driver or utility program on the

host system, control the operation of the controller however developers can enter these

commands directly. This chapter:

• Describes the controller default settings.

• Lists the recommended firmware commands.

• Describes how to use each of these commands.

• References additional commands developers may need to use.

The description of each command includes the command syntax, the default value, how

the command works, and the expected response from the controller.

Controller Default Settings

Communication Parameters

The RX142 controller communication parameters are N81 (no parity, 8 data bits, and 1

stop bit) at 9600 baud.

Data Format

Data format refers to the type of packet the controller uses to send the X/Y touch

coordinates to the host system. Format Tablet is the format for the RX142 controller. In

Format Tablet, the controller sends 5 bytes per point and provides the most rapid

response time to a touch.

• Format Tablet is supported by all current 3M™ MicroTouch™ controllers.

• It is the standard for current 3M Touch Systems product development and is the

format used by all touch drivers written by 3M Touch Systems.

Refer to the Format Tablet command in the firmware reference section.

SC402S Datasheet(PDF) 15 Page - 3M Electronics