Command Set

$ Use in conjunction with D, S, or & commands (or just AT) to display a basic command list; online help.
A Manual Answer: goes off hook in answer mode. Pressing any key aborts the operations.
A/ Re-executes the last issued command. Used mainly to redial. This does not require the AT prefix or a Carriage Return.
A> Re-executes the last-issued command continually.
Any key Aborts off-hook dial/answer operation and hangs up.

AT Required command prefix, except with A/ and +++. Use alone to test for OK result code.

Bn U.S./ITU-T answer sequence.

B0 ITU-T answer sequence
B1 U.S. answer tone

Dn Dials the specified phone number. Includes the following:

L Dials the last dialed number.
P Pulse (rotary) dial
R Originates call using answer (reverse) frequencies.
Sn Dials the phone number string stored in NVRAM at position n (n = 03). Phone numbers are stored with the &Zn=s command.
T Tone dial
, (Comma) Pause, See S8 definition; which it's linked to.
; (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 ms. 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).
$ Displays a list of Dial commands.

En Sets local echo.

E0 Echo OFF
E1 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 Local echo OFF. Receiving system may send a remote echo of data it receives.

Hn Controls 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 volume
L1 Low volume
L2 Medium volume
L3 High volume

Mn Operates speaker.

M0 Speaker always OFF.
M1 Speaker ON until CONNECT.
M2 Speaker always ON.
M3 Speaker ON after 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 touch-tone dialing).

Qn Displays/suppresses result codes.

Q0 Displays result codes.
Q1 Quiet mode; no result codes.
Q2 Displays 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 Verbal codes

Xn Sets result code displayed. Default is X4.

Xn Setting
Result Codes X0 X1 X2 X3 X4
0/OK
1/CONNECT
2/RING
3/NO CARRIER
4/ERROR
5/CONNECT 1200
6/NO DIAL TONE
7/BUSY
8/NO ANSWER*
9/RESERVED
10/CONNECT 2400
11/RINGING
13/CONNECT 9600
18/CONNECT 4800
20/CONNECT 7200
21/CONNECT 12000
25/CONNECT 14400
43/CONNECT 16800
85/CONNECT 19200
91/CONNECT 21600
99/CONNECT 24000
103/CONNECT 26400
107/CONNECT 28800
151/CONNECT 31200
155/CONNECT 33600

Xn (continued)

Xn Result Codes (cont.) X0 X1 X2 X3 X4
Adaptive Dialing
Wait for 2nd Dial Tone (W)
Wait for Answer (@)
Fast Dial
*Requires @ in dial string; replaces NO CARRIER

Yn Selects power-on/reset default configuration.

Y0 Default is profile 0 setting in NVRAM
Y1 Default is profile 1 setting in NVRAM

Z Resets modem.

Z0 Resets modem to NVRAM profile selected by Y command or dip 7.
Z1 Resets modem to NVRAM profile 0
Z2 Resets modem to NVRAM 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.

&A 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 Protocol indicators addedLAPM/MNP/NONE (error control) and V42bis/MNP5 (data compression)

&Bn Manages modem's serial port rate.

&B0 Variable, follows connection rate
&B1 Fixed serial port rate
&B2 Fixed in ARQ mode, variable in non-ARQ mode

&Cn Controls Carrier Detect (CD) signal.

&C0 CD override
&C1 Normal CD operations

&D0 DTR override
&D1 DTR toggle causes online Command mode
&D2 Normal DTR operations
&D3 Resets on receipt of DTR
&Fn Loads a read-only (non-programmable) factory configuration.
&F0 Generic template
&F1 Hardware flow control template
&F2 Software flow control template
&Gn Sets Guard Tone.
&G0 No guard tone, U.S. and Canada
&G1 550 Hz guard tone, some European countries, requires B0 setting.
&G2 1800 Hz guard tone, U.K., requires B0 setting.
&Hn Sets Transmit Data (TD) flow control (see also &Rn).
&H0 Flow control disabled
&H1 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 Software flow control disabled
&I1 XON/XOFF signals to your modem and remote system
&I2 XON/XOFF signals to your modem only
&Kn Enables/disables data compression.
&K0 Data compression disabled
&K1 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 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.

&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 U.S./Canada ratio, 39%/61%
&P1 U.K. 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 Received Data to computer only on RTS
&Sn Controls Data Set Ready (DSR) operations.
&S0 DSR override; always ON
&S1 Modem controls DSR
&Tn Begins test modes (used in conjunction with s register 18).
&T0 Ends testing
&T1 Analog 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 Analog Loopback with self-test and error detector
&Un Sets floor connect speed when &Un is set greater than 0. &Nn is the ceiling connect speed. See &Nn.
&U0 Disabled
&U1 300 bps
&U2 1200 bps
&U3 2400 bps
&U4 4800 bps
&U5 7200 bps
&U6 9600 bps
&U7 12,000 bps
&U8 14,400 bps
&U9 16,800 bps
&U10 19,200 bps
&U11 21,600 bps
&U12 24,000 bps
&U13 26,400 bps
&U14 28,800 bps
&U15 31,200 bps
&U16 33,600 bps
&Wn Writes 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 Destructive, expedited
&Y2 Nondestructive, expedited
&Y3 Nondestructive, unexpedited
&Zn=s Writes phone number string s to NVRAM at position n (n = 03).

&Zn=L Writes last executed dial string to NVRAM at position n (n = 03).

&Zn? Displays the phone number stored at position n (n = 03).

&ZL? Displays the last executed dial string.

#CID=n Controls Caller ID feature.

#CID=0 Caller ID disabled.
#CID=1 Caller ID enabled.
#CID=2 Caller ID enabled with extended information, including caller's name.

+++ Escapes to online-command mode.