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AT Command Summary
Command
Description
+++
Escape code
A/
Repeat last command string
AT
Attention
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
E0
Echo off (command mode)
E!
Echo on (command mode)
HO
On hook: hang up immediately
H!
Off hook: ready to dial
I0
Returns modem's product ID code
I1
Returns modem's ROM checksum
I2
Tests modem's internal memory
L3
Speaker volume high
M0
Speaker always off
M1
Speaker on until carrier is detected
M2
Speaker always on
M3
Speaker on after lost digit dialed; off when carrier is detected
O0
Return on-line
O1
Return on-line and initiate equalizer retrain (2400 bps)
Q0
Result codes on
Q1
Result codes off
Sr
Sets pointer to register r
Sr?
Reads value stored in r
Sr=n
Sets register r to n
V0
Returns result codes as numbers
V1
Returns result codes as words
X0
Enables basic result codes (0-4)
X1
Enables extended result codes (0-5, 10)
X2
Enables extended result codes (0-6, 10)
X3
Enables result codes (0-5,7,10)
B-4
Fax/Modem