US Robotics 3CP3453 Quick Reference Card

U.S. Robotics 56K Corporate Modem
Commands
This card provides a quick reference for the most commonly used
AT commands. Defaults in bold type.
NOTE: Refer to the Alphabetic Command Summary, in the User
Guide on the CD-ROM for additional commands, like the Percent
(%) and Octothorpe (#) command sets.
B C S
ASIC OMMAND ET
Command/Description
$ Displays Help for the basic command set
+++ Escape code
> Repeat command (up to 10 attempts)
A modem answers when there's no incoming call
A/ Reexecutes the last-issued command
A> Repeats the last issued command until canceled
AT Attention prefix
Bn Sets handshaking options:
B0 ITU-T V.32 originate mode
B1 HST originate mode; Bell answer tone
Cn Sets transmitter
B0 Transmitter off
B1 Transmitter on
Dn Dials phone numbers and issues commands for
dialing options:
P Pulse dial
T Tone dial
, (Comma) Pause for 2 seconds
; (Semicolon) Return to command mode after
dialing
" Dial the letters that follow
W Wait for a second dial tone (if X3 or higher)
@ Wait for an answer (with X3, X4 or X7)
/ Pause for 125 milliseconds
R Reverse frequencies
! Flash the switchhook
L? Display the last-dialed number
L Redial the last number
Sn Dial number stored in non-volatile random access
memory (NVRAM) at position n
$ Display Help for the dial commands
En Command mode echo
EO Echo OFF; What you type will not display
E1 Echo On; What you type will display
Fn Online local echo
F0 Echo ON
F1 Echo OFF
Hn On/Off hook control
H0 Go on hook (hang up)
H1 Go off hook (pick up)
In Queries the modem
I3 Banner
I4 Current settings
I5 NVRAM settings
I6 Statistics for preceding call
I7 Product configuration
I10 Dial security account status
I11 Extended Link Screen
I15 Caller ID information
Kn Controls the modem clock
K0 If online, current call duration
K1 Displays real time
Ln Controls speaker volume
L0 Low volume
L1 Low volume
L2 Medium volume
L3 High volume
Mn Controls when the speaker sounds
M0 Always OFF
M1 ON until call is negotiated
M2 Always ON
M3 ON after last digit is dialed
On Return online; use with escape code (+++)
O0 Return online
O1 Return online and retrain
P Pulse dial
Qn Enables or disables the display of result codes
Q0 Display
Q1 Suppress (quiet)
Q2 Suppress when answering
Sr=n Sets S-register value; r is any S-Register; n must be
a decimal between 0 and 255
Sr.b=n Sets bit-mapped register; r is the S-register, b is
the bit, and n is 0 (OFF) or 1 (ON)
Sr? Queries contents of S-register r
S$ Displays s-register help
T Tone dial
Vn Displays result codes verbally or numerically
V0 Numeric
V1 Verbal
Xn Call progress reporting
X3 Ignore dial tone
®
X4 Microsoft default
X7 Courier V.Everything Modem default
Z Software reset
Z! Hardware reset
A (&) C S
MPERSAND OMMAND ET
Command/Description
&$ Displays Help for the ampersand (&) command set
&An Enables or disables the additional result code subsets
&A0 Disables the display of additional result codes
&A1 Displays ARQ result codes
&A2 Displays ARQ result codes, modulation
indicators
&A3 Displays ARQ result codes, modulation
indicators, and error control indicator
&Bn Sets the serial port rate
&B0 Variable
&B1 Fixed
&B2 Fixed serial port rate in ARQ mode;
variable rate in non-ARQ mode
&Cn Controls Carrier Detect (CD)
&C0 CD always on
&C1 Normal CD operations
&Dn Controls Data Terminal Ready (DTR)
&D0 Ignore DTR
&D1 Online command mode with DTR toggle
&D2 Normal DTR operations
&D3 Modem resets with DTR toggle
&Fn Loads configuration template
&F0 Loads No flow control template
&F1 Loads Hardware flow control template
&F2 Loads Software flow control template
&Gn Sets guard tone
&G0 No guard tone (U.S., Canada)
&G1 Guard tone (Some European countries)
&G2 Guard tone (UK); requires ATB0
&Hn Transmit Data flow control
&H0 Disables Transmit Data flow control
&H1 Hardware Clear to Send (CTS) flow control
&H2 Software flow control (XON/XOFF)
&H3 Hardware and software flow control
&In Received Data software flow control
&I0 Disables XON/XOFF flow control
&I1 Modem acts on XON/XOFF commands and
passes them to the remote device
&I2 Modem acts on XON/XOFF commands and
removes commands from the data stream
(recommended for ARQ mode)
&I3 External: Hewlett Packard-Host mode
(ARQMode Only)
&I4 External:Hewlett Packard-Terminal mode
(ARQMode Only)
&I5 XON/XOFF in non ARQ Mode
&Kn Enables or disables data compression
&K0 Disable
&K1 Auto enable/disable
&K2 Enable
&K3 Selective compression (V.42 bis only)
&Mn Error control
&M0 Normal mode; no error control
&M4 Normal /ARQ mode
&M5 Asynchronous ARQ mode
&Nn Sets fixed link speed
&Nn&Un Sets highest and lowest link speeds
n = 0 Variable connection rate
n = 1 300 bps n = 21 33.3 Kbps
n = 2 1200 bps n = 22 34.6 Kbps
n = 3 2400 bps n = 23 36.0 Kbps
n = 4 4800 bps n = 24 37.3 Kbps
n = 5 7200 bps n = 25 38.6 Kbps
n = 6 9600 bps n = 26 40.0 Kbps
n = 7 12.0 Kbps n = 27 41.3 Kbps
n = 8 14.4 Kbps n = 28 42.6 Kbps
n = 9 16.8 Kbps n = 29 44.0 Kbps
n = 10 19.2 Kbps n = 30 45.3 Kbps
n = 11 21.6 Kbps n = 31 46.6 Kbps
n = 12 24.0 Kbps n = 32 48.0 Kbps
n = 13 26.4 Kbps n = 33 49.3 Kbps
n = 14 28.8 Kbps n = 34 50.6 Kbps
n = 15 31.2 Kbps n = 35 52.0 Kbps
n = 16 33.6 Kbps n = 36 53.3 Kbps
n = 17 28.0 Kbps n = 37 54.6 Kbps
n = 18 29.3 Kbps n = 38 56.0 Kbps
n = 19 30.6 Kbps
n = 20 32.0 Kbps
&Rn Received Data (RTS) hardware flow control
&R0 Delay clear to send (CTS) response
after RTS
&R1 Ignore RTS
&R2 Send data to the computer on receipt
of RTS
&Sn Data Set Ready (DSR) signal from modem to pc
&S0 DSR always on
&S1 Originate mode: Send DSR after dialing
Answer mode: Send DSR after tone
&S2 Pulsed DSR with CTS following CD
&S3 Same as &S2, but without CTS
&S4 Simultaneous DSR with CD
&S5 Send DSR, and follow CTS with CD
&W Writes the current settings to NVRAM
&Zn=s Stores up to 10 phone numbers in NVRAM at
position n where n = 0-9
&Zn? Displays the stored phone number