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 except +++, /, 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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