The AT Command Set
Commands marked œ are the defaults.
AT Required command prefix, except with A/ and +++. Use alone to test for OK result code.
$ Displays a basic command list; online help.
A/ Re-executes the last issued command. Used mainly to redial. This does not require the AT prefix or a Carriage Return.
A Manual Answer; goes off hook in answer mode. Pressing any key aborts the operations.
Bn US/ITU-T answer sequence.
B0 œ ITU-T answer sequence
B1 US answer tone
Dn Dials the specified phone number. Includes the following :
P œ Pulse (rotary) dial
T Tone dial
, (Comma) Two-second pause; linked to S-8 register
; (Semicolon) Return to Command mode after dialing
" Dials the letters that follow (in an alphabetical phone number)
! (Exclamation point) Flashes the switch hook
/ Delays for 125 msec, before proceeding with dial string
W Wait for second dial tone (X2 or X4); linked to S6 register
@ Dials, waits for quiet answer, and continues (X3 or higher)
R Originates call using answer (reverse) frequencies
DL Dials the last-dialed number.
DSn Dials the phone number string stored in NVRAM at position n (n = 0-3). Phone numbers are stroed with the &Zn=s command.
D$ Displays a list of Dial commands.
En Sets local echo.
E0 Echo off
E1 œ Modem displays keyboard commands
Fn Sets online local echo of transmitted data on/off.
F0 Local echo on. Modem sends a copy of data it sends to the remote system to your screen.
F1 œ Local echo off. Receiving system may send a remote echo of data is receives.
Hn Control on/off hook.
H0 Hangs up (goes on hook)
H1 Goes off hook
In Displays the following information.
I0 Four-digit product code
I1 Results of ROM checksum
I2 Results of RAM checksum
I3 Product type
I4 Current modem settings
I5 Nonvolatile memory (NVRAM) settings
I6 Link diagnostics
I7 Product configuration
Ln Controls speaker volume (internals only).
L0 Low
L1 Low
L2 œ Medium
L3 High
Mn Operates speaker.
M0 Speaker always off
M1 œ Speaker on until CONNECT
M2 Speaker always on
M3 Speaker on afer dial, until CONNECT
On Returns online.
O0 Returns online
O1 Returns online and retrains
P Sets pulse dial (for phone lines that don't support touchtone dialing).
Qn Displays/suppresses result codes.
Q0 Displays result codes
Q1 Quiet mode; no result codes
Q2 Display result codes only in Originate mode
Sr.b=n Sets bit b of register r to n (0/off or 1/on).
Sr=n Sets register r to n.
Sr? Displays contents of S-Register r.
S$ Displays a list of the S-Registers.
T Sets tone dial.
Vn Displays verbal/numeric result codes.
V0 Numeric codes
V1 œ Verbal codes
Xn Set result code displayed. Default is X4. XTable
Yn Selects power-on/reset default configuration.
Y0 œ Default is profile 0 setting in NVRAM
Y1 Default is profile 1 setting in NVRAM
Zn Resets modem.
Z0 œ Resets modem to NVRAM profile selected by Y command
Z1 Resets modem to NVRAM profile 0
Z2 Resets modem to MVRAM profile 1
Z3 Resets modem to factory default profile 0 (&F0)
Z4 Resets modem to factory default profile 1 (&F1)
Z5 Resets modem to factory default profile 2 (&F2)
&$ Displays a list of ampersand (&) commands
&An Enables/disables additional result code subsets (see Xn).
&A0 ARQ result codes disabled
&A1 ARQ result codes enabled
&A2 V.32 modulation indicator added
&A3 œ Protocol indicators added - LAPM/MNP/NONE (error control) and V42bis/MNP5 (data compression)
&Bn Manages modem's serial port rate.
&B0 Variable, follows connection rate
&B1 œ Fixed serial port rate
&B2 Fixed in ARQ mode, variable in non-ARQ mode
&Cn Controls Carrier Detect (CD) signal.
&C0 CD override
&C1 œ Normal CD operations
&Dn Controls Data Terminal Ready (DTR) operations.
&D0 DTR override
&D1 DTR toggle causes online Command mode
&D2 œ Normal DTR operations
&D3 Resets on receipt of DTR
&Fn Loads a read-only (non-programmable) factory configuration.
&F0 Generic template
&F1 œ Hardware flow control template
&F2 Software flow control template
&Gn Sets Guard Tone.
&G0 œ No guard tone, US and Canada
&G1 550Hz guard tone, some European countries, requires B0 setting
&G2 1800Hz guard tone, UK, required B0 setting
&Hn Sets Transmit Data (TD) flow control (see also &Rn).
&H0 Flow control disabled
&H1 œ Hardware flow control, Clear to Send (CTS)
&H2 Software flow control, XON/XOFF
&H3 Hardware and software flow control
&In Sets Receive Data (RD) software flow control (see also &Rn).
&I0 œ Software flow control disabled
&I1 XON/XOFF signal to your modem and remote system
&I2 XON/XOFF signals to your modem only
&I3 Hewlett Packard: Host mode
&I4 Hewlett Packard: Terminal mode
&I5 ARQ mode - same as &I2; non-ARQ mode - look for incoming XON/XOFF
&Kn Enables/disables data compression.
&K0 Data compression disabled
&K1 œ Auto enable/disable
&K2 Data compression enabled
&K3 MNP5 compression disabled
&Mn Sets Error Control (ARQ) for connections at 1200 bps and higher.
&M0 Normal mode, error control disabled
&M1 Reserved
&M2 Reserved
&M3 Reserved
&M4 œ Normal/ARQ
&M5 ARQ mode
&Nn Sets connect speed. If connection cannot be established at this speed, the modem will hang up. Sets ceiling connect speed if &Un is greater than 0. See &Un.
&N0 œ Variable rate
&N1 300 bps
&N2 1200 bps
&N3 2400 bps
&N4 4800 bps
&N5 7200 bps
&N6 9600 bps
&N7 12,000 bps
&N8 14,400 bps
&N9 16,800 bps
&N10 19,200 bps
&N11 21,600 bps
&N12 24,000 bps
&N13 26,400 bps
&N14 28,800 bps
&N15 31,200 bps
&N16 33,600 bps
&Pn Sets pulse (rotary) dial make/break ratio.
&P0 œ US/Canada ratio, 39%/61%
&P1 UK ratio, 33%/67%
&Rn Sets Receive Data (RD) hardware flow control, Request to Send (RTS) (see also &Hn).
&R0 Reserved
&R1 Modem ignores RTS
&R2 œ Received Data to computer only on RTS
&Sn Controls Data Set Ready (DSR) operations.
&S0 œ DSR override; always on
&S1 Modem controls DSR
&Tn Begins test modes.
&T0 Ends testing
&T1 Analogue Loopback
&T2 Reserved
&T3 Local Digital Loopback
&T4 Enables Remote Digital Loopback
&T5 Prohibits Remote Digital Loopback
&T6 Initiates Remote Digital Loopback
&T7 Remote Digital with self-test and error detector
&T8 Analogue Loopback with self-test and error detector
&Un Sets floor connect speed when &Un is greater than 0. &Nn is the ceiling connect speed. See &Nn.
&N0 œ Disabled
&N1 300 bps
&N2 1200 bps
&N3 2400 bps
&N4 4800 bps
&N5 7200 bps
&N6 9600 bps
&N7 12,000 bps
&N8 14,400 bps
&N9 16,800 bps
&N10 19,200 bps
&N11 21,600 bps
&N12 24,000 bps
&N13 26,400 bps
&N14 28,800 bps
&N15 31,200 bps
&N16 33,600 bps
&Wn Write current configuration to NVRAM templates.
&W0 Modifies the NVRAM 0 template (Y0)
&W1 Modifies the NVRAM 1 template (Y1)
&Yn Sets break handling.
&Y0 Destructive, but doesn't send break
&Y1 œ Destructive, expedited
&Y2 Nondestructive, expedited
&Y3 Nondestructive, unexpedited
&Zn=s Writes phone number string s to NVRAM as position n (=0-3).
&Zn=L Writes last executed dial string to NVRAM at position n (=0-3).
&Zn? Displays the phone number stored at position n (=0-3).
&ZL? Displays the last executed dial string.
#CLSn Selects Data, Fax or Voice mode.
#CLS0 Data mode
#CLS1 Class 1 Fax
#CLS2 Class 2.0 Fax
#CLS8 Voice mode. In this mode, the following commands can be requested :
#VRX Receives voice file from line, microphone or handset.
#VTX Transmits voice file to line, speaker or handset.
-SAC Accepts VoiceView Data Mode Request.
-SDA Begins VoiceView Modem Data Mode.
-SDX Begins VoiceView Facsimile Data Mode.
-SVV Begins VoiceView Data Mode.
+++ Escapes to online-command mode.
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