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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-4 Fax/Modem