US Robotics Courier V.Everything 3CP3453 Reference guide

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.
BASIC COMMAND SET
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
BnSets handshaking options:
B0 ITU-T V.32 originate mode
B1 HST originate mode; Bell answer tone
CnSets transmitter
B0 Transmitter off
B1 Transmitter on
DnDials phone numbers and issues commands for
dialing options:
PPulse 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
SnDial number stored in non-volatile random access
memory (NVRAM) at position n
$ Display Help for the dial commands
EnCommand mode echo
EO Echo OFF; What you type will not display
E1 Echo On; What you type will display
FnOnline local echo
F0 Echo ON
F1 Echo OFF
HnOn/Off hook control
H0 Go on hook (hang up)
H1 Go off hook (pick up)
InQueries 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
KnControls 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
MnControls when the speaker sounds
M0 Always OFF
M1 ON until call is negotiated
M2 Always ON
M3 ON after last digit is dialed
OnReturn online; use with escape code (+++)
O0 Return online
O1 Return online and retrain
PPulsedial
QnEnables or disables the display of result codes
Q0 Display
Q1 Suppress (quiet)
Q2 Suppress when answering
Sr=n Sets S-register value; ris any S-Register; nmust be
a decimal between 0 and 255
Sr.b=n Sets bit-mapped register; ris the S-register, bis
the bit, and nis 0 (OFF) or 1 (ON)
Sr? Queries contents of S-register r
S$ Displays s-register help
T Tone dial
VnDisplays result codes verbally or numerically
V0 Numeric
V1 Verbal
XnCall progress reporting
X3 Ignore dial tone
X4 Microsoft®default
X7 Courier V.Everything Modem default
Z Software reset
Z! Hardware reset
AMPERSAND (&) COMMAND SET
Command/Description
&$ Displays Help for the ampersand (&) command set
&AnEnables 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
&BnSets the serial port rate
&B0 Variable
&B1 Fixed
&B2 Fixed serial port rate in ARQ mode;
variable rate in non-ARQ mode
&CnControls Carrier Detect (CD)
&C0 CD always on
&C1 Normal CD operations
&DnControls Data Terminal Ready (DTR)
&D0 Ignore DTR
&D1 Online command mode with DTR toggle
&D2 Normal DTR operations
&D3 Modem resets with DTR toggle
&FnLoads configuration template
&F0 Loads No flow control template
&F1 Loads Hardware flow control template
&F2 Loads Software flow control template
&GnSets guard tone
&G0 No guard tone (U.S., Canada)
&G1 Guard tone (Some European countries)
&G2 Guard tone (UK); requires ATB0
&HnTransmit 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
&InReceived 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
&KnEnables or disables data compression
&K0 Disable
&K1 Auto enable/disable
&K2 Enable
&K3 Selective compression (V.42 bis only)
&MnError control
&M0 Normal mode; no error control
&M4 Normal /ARQ mode
&M5 Asynchronous ARQ mode
&NnSets fixed link speed
&Nn&UnSets 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
&RnReceived 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
&SnData 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 nwhere n= 0-9
&Zn? Displays the stored phone number

S-REGISTERS
Register Default Function
S0 0 Sets the number of rings before Auto Answer
S1 0 Counts and stores number of rings from calls
S2 43 Stores code for the escape code character
S3 13 Stores the code for the carriage return
S4 10 Stores the code for the line feed character
S5 8 Stores the code for the back space character
S6 2 Stores the wait time for dial tone
S7 60 Stores the wait time for carrier
S8 2 Sets the comma time in seconds
S9 6 Sets duration (1/10 of sec.) of remote
carrier signal before modem recognition
S10 14 Sets duration (1/10 of sec.) modem waits
after loss of carrier before hanging up
S11 70 Set touch tones spacing in 1/10 seconds.
S12 50 Sets the guard time for the escape code
S13 0 Bit-mapped register
Bit Value Result
0 1 Reset when DTR drops
1 2 Originate mode in Auto Answer
2 4 Disables pause before result codes
3 8 Auto Dial the number stored in NVRAM
position 0 on DTR
4 16 At power on, Auto Dial number
stored in NVRAM at position 0
532 DisableHST
6 64 Disable MNP Level 3
7128 HardwareReset
S14 1 Bit-mapped register
Bit Value Result
0 1 Disconnects on Escape code
S15 0 Bit-mapped register
Bit Value Result
0 1 Disables high frequency
equalisation
1 2 Disables online fallback
2 4 Disables 450 bps back channel
3 8 Sets non-ARQ buffer to 128 bytes
4 16 Disables MNP Level 4
5 32 Set backspace key to delete
6 64 Unusual MNP incompatibility
7 128 Custom applications only
S19 0 Sets the inactivity timeout, in minutes
S21 10 Length of break in ARQ mode, 1/100 seconds
S22 17 Stores the ASCII code for the XON character
S23 19 Stores the ASCII code for the XOFF character
S24 150 Sets DSR pulse time in 20-milliseconds
S25 5 Sets DTR recognition in 10-milliseconds
S26 1 Sets the RTS/CTS delay, 10-milliseconds
S27 0 Bit-mapped register
Bit Value Result
0 1 Enables V.21 modulation at 300 bps
1 2 Disables Trellis Code modulation
2 4 Disables V.32 modulation
3 8 Disables 2100 Hz answer tone
416 See Bit 4 and Bit 5 below
532 See Bit 4 and Bit 5 below
7 128 Unusual software compatibility
Bit4 Bit5 Result
0 0 Complete handshaking sequence
16 0 Disables MNP
0 32 Disables V.42 detection and LAPM
16 32 Disables detection phase
S28 8 Sets duration, in tenths of a second, of extra
3000/600 Hz answer tones
S29 20 Sets, in tenths of a sec, of the V.21answer tone
S34 0 Bit-mapped register
Bit Value Result
0 1 Disables V.32 bis
1 2 Disables enhanced V.32 Mode
2 4 Disables Quick V.32 Retrain
3 8 Enables V.23 modulations
4 16 Externals: Forces MR LED to show DSR
6 64 Disables remote access busy message
7 128 Disables V.32 terbo
S38 0 Sets duration, in seconds, before a forced hang up
S41 0 Sets number of attempts for remote access
S42 126 Stores the ASCII code for remote access escape
S43 200 Sets the guard time for the remote access
sequence, in 1/50th of a second
S44 15 Leased line delay timer
S51 0 Bit-mapped register
Bit Value Result
0 1 D i s a b l e s M N P / V. 4 2 i n V. 2 2
1 2 D i s a b l e s M N P / V. 4 2 i n V. 2 2 bis
2 4 D i s a b l e s M N P / V. 4 2 i n V. 3 2
6 64 Disables selective reject
S53 0 Bit-mapped register
Bit Value Result
0 1 Enables dial security
1 2 Enables prompting
2 4 Enables local password protection
S54 64 Symbol bit-mapped register
Bit Value Result
0 1 Disable 2400 symbol rate
1 2 Disable 2743 symbol rate
2 4 Disable 2800 symbol rate
3 8 Disable 3000 symbol rate
4 16 Disable 3200 symbol rate
5 32 Disable 3429 symbol rate
6 64 Disable Call Indicate (CI)
7 128 Disable V.8
S55 0 Trellis code bit-mapped register
Bit Value Result
0 1 Disable 8S-2D trellis code
1 2 Disable 16S-4D trellis code
2 4 Disable 32S-2D trellis code
3 8 Disable 64S-4D trellis code
7 128 Enable phase roll detection
S56 0 Bit-mapped register
Bit Value Result
0 1 Disable non-linear coding
1 2 Disable TX level deviation
2 4 Disable preemphasis
3 8 Disable precoding
4 16 Disable shaping
532 DisableV.34+
664 DisableV.34
7 128 Disable V.FC
S58 0 Bit-mapped register
Bit Value Result
01 Disablesx2
532 DisablesV.90
S69 0 Bit-mapped register
Bit Value Result
0 1 Disables plug/play signalling
1 2 Enables carrier loss redial
S70 0 Bit-mapped register
Bit Value Result
0 1 Enables recognition of Ring A
1 2 Enables recognition of Ring B
2 4 Enables recognition of Ring C
3 8 Enables recognition of Ring D
U.S. Robotics 56K Corporate
Modem
Quick Reference Card
PN R24.0330.00
Copyright© 2002 U.S. Robotics Corporation. All rights reserved. U.S. Robotics and the U.S.
Robotics logo are registered trademarks of U.S. Robotics Corporation. Other product names
are for identification purposes only and may be trademarks of their respective companies.
Product specifications subject to change without notice.
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