Appendix B

Modem AT Commands and S-Registers

The AT command set allows you to control your modem from a command line or from terminal mode. Some guidelines for using the AT command set are listed in the following tables.

•AT commands are usually preceded by AT. They are not case sensitive and do not require spaces in the command strings themselves.

•AT commands can be invoked from any modem communications software under terminal mode.

•AT commands invoked normally get a response of OK, ERROR or other messages, depending on the command. These are sometimes called "result codes".

•A Y in the Default column indicates that the command is preset at the factory. You can set the defaults by entering AT&F.

•An N appearing in the command string indicates that a number needs to replace it.

•AT commands can be invoked from any communications software under terminal mode.

Table B.1 AT Command Summary

Command

A/

ATA

ATB0

ATB1

ATC1

ATD

ATDn

ATE0

ATE1

Description

Re-execute last command

Respond to call

Select V.22 at 1200 bps

Bell 212A at 1200bps

Response message

Dial Command

Dial modifier

Local Echo Off

Local Echo On

Usage

Allows last successful command entered to be re-executed

Allows manual response when call is received from another modem. The S0=1 command sets the modem to answer automatically.

Select V.22 connection at 1200 bps

Select Bell 212A connection at 1200 bps

Return OK message

Get the modem to dial

Dial modifier

Do not display the characters you type

Display the characters when you type

Default

N

N

Y

N

N

N

N

N

Y

(continued through page B-6)

Modem ATCommands and S-Registers

B-1

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Accton Technology EN2218 manual Modem AT Commands and S-Registers, Appendix B
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EN2218 specifications

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