Introduction

Who Should Use this Reference

How this Reference is Organized

How to Use this Reference

Hayes Customer Service

This Technical Reference for Hayes Modem Users provides detailed information about the Hayes Standard AT Command Set for users who want to use the command set to control the modem. A complete listing of the Hayes Standard AT Commands is included in this Technical Reference.

You will find additional descriptions of some of the more complicated options, such as synchronous communications, and the interactions between communication standards, negotiation commands, and modem speeds. In addition, information about the connections between the modem and the computer or terminal is included.

The information in this Technical Reference supports all of the Hayes modems in the following product lines:

OPTIMA (TM)

ACCURA (TM)

Smartmodem(TM) ULTRA (TM)

OPTIMA (TM) PCMCIA

OPTIMA (TM) Pocket Edition (TM)

Millennium(TM) 8000 Network Systems

Century (TM) Rack Systems

Some of the information provided here may not apply to your particular modem. With the information provided here, you should be able to configure your modem with AT commands for a variety of communication environments. If you are just starting out with communications programming, this Technical Reference should provide you with sufficient tips to address the features of the modem through a software program.

Note: Not all features and commands are implemented in every modem. Refer to the modem documentation for the latest revision.

Notice: Hayes Microcomputer Products, Inc. reserves the right to make improvements to the products described in this manual at any time and without notice.

Hayes, the Hayes icon, the Hayes logo, the Hayes 302 Escape Sequence Patent icon, Pocket Edition, AutoSync, AutoStream, Vseries, Express 96, Smartmodem, ULTRA, ACCURA, OPTIMA, ESP, Millennium, Smartcom, Smartcom EZ, Smartcom Exec, Smartcom II and Smartcom III are trademarks of Hayes Microcomputer Products, Inc. MNP is a trademark of Microcom, Inc. V.FC is a trademark of Rockwell International, Corporation. VoiceView is a trademark of Radish Communications Systems, Inc. Other trademarks mentioned in this document are trademarks of their respective companies.

This document is copyrighted. All rights are reserved. This document may not, in whole or part, be copied, photocopied, reproduced, translated or reduced to any electronic medium or machine-readable form without prior consent, in writing, from Hayes Microcomputer Products, Inc.

©1996 Hayes Microcomputer Products, Inc.

All rights reserved. Printed in U.S.A.

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