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Using the AT Automatic Calling Interface 5-1

Using the

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Chapter 5

Using the AT Automatic Calling Interface

Contents

Introduction ..................................................................................................

What is the Attention (AT) Command Set? ..................................................

What Role Does Communications Software Play? ..................................

Using AT Commands ...................................................................................

Entering AT Command Lines ...................................................................

To enter a single AT command line: ....................................................

To enter multiple AT commands on a single command line: ..............

AT Command String Examples ...........................................................

For Further Detail on AT Commands ..................................................

Autobaud Feature .....................................................................................

The Escape Sequence—(+++) .................................................................

To use the escape sequence with guard time: ......................................

Non-Configuration AT Commands ..........................................................

A/, Re-Execute Last Command ...........................................................

ATA, Manual Answer ..........................................................................

ATD, Dial .............................................................................................

ATH, Hang Up .....................................................................................

ATI, Display Software Information .....................................................

ATO, Leave Command Mode ..............................................................

RD, Redial Last Number .............................................................

5-9

S-Registers ...............................................................................................

Displaying and Changing S-Register Values .......................................

S-Register Descriptions .......................................................................