Reference Information
Modem Reference Information
206
Corporate Evaluator’s Guide
Modem Reference (3Com/US Robotics)
In the following AT command table, default settings are shown in bold. All listed AT
commands ++, /, and A/ must be preceded by “AT.”
AT Commands (3Com/US Robotics)
Command
Function (3Com/US Robotics)
+++
Escape to online command mode (not preceded by AT)
/
Pause (not preceded by AT), 125 ms default
A Answer
manually
A/
Repeat last command (not preceded by AT)
D...
Dial a phone number and issue other optional commands: 0-9=Dial digit, T=Tone dial, P=Pulse dial, R=Call
an originate-only modem, W=Wait for second dial tone (X2, X4), @=Wait for answer (X3, X4),
(comma)=Pause in dialing, !=Flash switch hook, #=Auxiliary tone dial digit, *=Auxiliary tone dial digit, ;=Stay
in command mode after dialing, $=Wait for calling card bong, &=Wait for calling card bong, “=Dial the letters
that follow.
D$
Display a list of dial commands
DL
Redial last number
DL?
Display last dialed number
DSn
Dial stored number (n=0,1,2,3)
E0
Turn command echo off
E1
Turn command echo on
F0
Turn online echo on
F1
Turn online echo off
H0
Hang up (go on-hook)
H1
Pick up (go off-hook)
I0
Display the 4-digit product code
I1
Display the checksum
I2
Display the RAM test results
I3
Display the firmware version
I4
Display the current modem settings
I5
Display user profiles
I7
Display the product configuration
I8 Display
blacklist
screen
I10
Display VXD configuration screen
I11
Display V.34 link screen
L0
Set modem speaker volume off
L1
Set modem speaker volume on (low)
L2
Set modem speaker volume on (medium)
L3
Set modem speaker volume on (high)
M0
The modem’s speaker is always off
M1
The modem’s speaker is on until a connection is made
M2
The modem’s speaker is always on
M3
The modem’s speaker is off during dialing, and on after dialing until the connection is made
O0
Return to online mode
O1
Return to online mode and retrain (automatically return to the highest speed)
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