Chapter 5

Using the AT Automatic Calling Interface

Contents

Introduction

5-2

What is the Attention (AT) Command Set?

5-3

What Role Does Communications Software Play?

5-3

Using AT Commands

5-3

Entering AT Command Lines

5-3

To enter a single AT command line:

5-3

To enter multiple AT commands on a single command line:

5-4

AT Command String Examples

5-4

For Further Detail on AT Commands

5-4

Autobaud Feature

5-5

The Escape Sequence—(+++)

5-5

To use the escape sequence with guard time:

5-6

Non-Configuration AT Commands

5-6

A/, Re-Execute Last Command

5-7

ATA, Manual Answer

5-7

ATD, Dial

5-7

ATH, Hang Up

5-8

ATI, Display Software Information

5-8

ATO, Leave Command Mode

5-8

AT*RD, Redial Last Number

5-9

S-Registers

5-9

Displaying and Changing S-Register Values

5-9

S-Register Descriptions

5-10

 

 

Using the

AT ACU

Using the AT Automatic Calling Interface 5-1

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Motorola and V.32bis, V.34-SDC, 326X V.34 manual Using the AT Automatic Calling Interface, Contents