AT Command Summary

Command Description

+++Escape code

 

A/

Repeat last command string

 

 

 

 

 

 

 

A

Answer immediate (incoming call)

 

 

 

 

 

 

 

B0

CCITT V.22 protocol at 1200 bps

 

 

 

 

 

 

 

B1

Bell 103/212A protocol at 1200 bps

 

 

 

 

 

 

 

D

Dial; originates a call

 

 

 

 

 

 

 

EO

Echo off (command mode)

 

 

 

 

 

 

 

E1

Echo on (command mode)

 

 

 

 

 

 

 

H0

On hook; hangup immediately

 

 

 

 

 

 

 

H1

Off hook; ready to dial

 

 

 

 

 

 

 

I0

Returns modem’s product ID code

 

 

 

 

 

 

I1

Returns modem’s ROM checksum

 

 

 

 

 

 

 

 

12

 

 

 

Tests modem’s internal memory

 

 

 

 

 

 

 

 

 

1

 

L3

Speaker volume high

 

 

 

 

 

 

M0

Speaker always off

 

 

 

 

 

 

M1

Speaker on until carrier is detected

 

 

 

 

 

 

M2

Speaker always on

 

 

 

 

 

 

M3

Speaker on after last digit dialed; off when carrier is

 

 

 

 

 

 

detected

 

 

 

 

 

 

O0

Return on-line

 

 

 

 

O1

Return on-line and initiate equalizer retrain (2400 bps)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

B-4Fax/Modem