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Command
I1
I2
I3
I4
L_
L0
L1
L2
L3
M_
M0
M1
M2
M3
N_
O_
O0
O1
P
Q_
Q0
Q1
Sr?
Sr=n
T
V_
V0
V1
W_
W0
W1
W2
X_
X0
X1
X2
X3
X4
Z_
Z0
Z1
Extended AT commands
Command
&C0
&C_
&C1
&D0
&D_
&D1
32
User Guide
Function
Factory ROM checksum test
Internal memory test
Firmware ID
Reserved ID
Low speaker volume
Low speaker volume
Medium speaker volume
High speaker volume
Internal speaker off
Internal speaker on until carrier detected
Internal speaker always on
Internal speaker on until carrier detected and off while dialing
Included for compatibility only, provides no effect
Return to Data Mode
Return to Data Mode and initiate an equalizer retrain
Set Pulse dial as default
Modem sends responses
Modem does not send responses
Read and display value in register r.
Set register r to value n (n = 0-255).
Set Tone Dial as default
Numeric responses
Word responses
Report DTE speed only
Report line speed, error correction protocol, and DTE speed.
Report DCE speed only
Hayes Smartmodem 300 compatible responses/blind dialing.
Same as X0 plus all CONNECT responses/blind dialing
Same as X1 plus dial tone detection
Same as X1 plus busy detection/blind dialing
All responses and dial tone and busy signal detection
Reset and retrieve active profile 0
Reset and retrieve active profile 1
Function
Force Carrier Detect Signal High (ON)
Turn on CD when remote carrier is present
Modem ignores the DTR signal
Modem returns to Command Mode after DTR toggle
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