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Hayes AT Command Sets [ (F) = Factory default ]
CMD 300 1200 2400 2400 Action
Early Current
---------------------------------------------------------------------
Basic Commands:
+++ Y Y Y Y Exit DATA mode and enter COMMAND
mode, default character.
A/ Y Y Y Y Reissue command held in modem's
command buffer.
AT Y Y Y Y Precedes all commands to get the
modems attention.
Dialing Commands:
! - Y Y Y Initiate hookflash, on-hook for 0.5
sec.
, Y Y Y Y Wait time, S8 value, before dialing
next digit.
: Y Y Y Y Return to the COMMAND mode after
dialing.
@ - Y Y Y Wait for 5 sec of silence before
dialing next digit.
P Y Y Y Y Set dialing type to Pulse Dialing.
R Y Y Y Y After dialing enter the ANSWER mode.
S - - Y - Dial number stored in nonvolatile
memory
Sn - - - Y Dial number stored in nonvolatile
memory location n.
T Y Y Y Y Set dialing type to DMTF Dialing.
W - Y Y Y Wait for second dial tone before
dialing next digit.
Modem Control Commands:
A Y Y Y Y Go Off-hook and enter ANSWER mode,
answer tone in app 2 sec.
B0 - Y Y Y Use CCITT V.22 for 1200 bps
operation.
B1 - Y (F) Y (F) Y (F) Use BELL 212a for 1200 bps operation.
C0 Y Y - - Disable the transmitter carrier
C1 Y (F) Y (F) - - Enable the transmitter carrier
D Y Y Y Y Dial the following phone number.
E0 Y Y Y Y Do not ECHO char in the command mode.
E1 Y (F) Y (F) Y (F) Y (F) ECHO characters when in the command
mode.
F0 Y Y - - NO echo of character when in DATA
mode
F1 Y (F) Y (F) - - Echo character when in DATA mode
H0 Y Y Y Y Place modem ON-hook.
H1 Y Y Y Y Place modem OFF-hook, line and aux
relays.
H2 Y Y - - Place modem OFF-hook, line relay
only.
I0 - Y Y Y Check modem ID code
I1 - Y Y Y Check modem checksum
I2 - Y Y Y Verify modem memory matches checksum
L0 Pot Y Y Y Set speaker volume LOW
L1 Pot Y Y Y Set speaker volume LOW
L2 Pot Y Y (F) Y (F) Set speaker volume MED
L3 Pot Y Y Y Set speaker volume HI
M0 Y Y Y Y Speaker set always OFF.
M1 Y (F) Y (F) Y (F) Y (F) Speaker set ON during dialing, line
connect, modem connect.
M2 Y Y Y Y Speaker set always ON.
M3 - - Y Y Speaker set ON after dial until modem
connect.
O0 Y Y Y Y Enter the DATA mode and wait for
carrier. If a carrier is present
continue ON-LINE.
O1 - - Y Y Return to DATA mode and begin the
RETRAIN sequence
Q0 Y (F) Y (F) Y (F) Y (F) Result codes are returned upon
execution of commands.
Q1 Y Y Y Y Result codes are NOT returned upon
execution of commands.
Sr? Y Y Y Y Display register r's value
Sr=n Y Y Y Y Set register r to value n
V0 Y Y Y Y Display result codes as numberic
digits
V1 Y (F) Y (F) Y (F) Y (F) Display result codes as english text.
X0 Preset Y Y Y Basic response, blind dial, no busy
detection
X1 - Y (F) Y Y Extended response, blind dial, no
busy detection
X2 - - Y Y Extended response, dial tone
detection, no busy detection
X3 - - Y Y Extended response, blind dialing,
busy detection
X4 - - Y (F) Y (F) Extended response, dial tone
detection, busy detection
Y0 - Y (F) Y (F) Y (F) Disable long space disconnect
operation.
Y1 - Y Y Y Enable long space disconnect
operation.
Z - - Y - Reset modem to user configuration
from nonvolatile memory
Z Y Y - - Reset modem
Zn - - - Y Reset modem to user configuration
from nonvolatle memory n
Extended Commands:
&C0 DIP DIP Y (F) Y (F) Force the Data Carrier Detect line
active, always on.
&C1 DIP DIP Y Y Data Carrier Detect line will follow
the incoming carrier.
&D0 DIP DIP Y (F) Y (F) The DTR line is ignored by the modem
&D1 - - Y Y When the DTR line toggles the modem
will enter the COMMAND mode.
&D2 DIP DIP Y Y When the DTR line toggles the modem
will hang-up, enter the COMMAND mode,
and disable Auto-answer.
&D3 - - Y Y When the DTR line toggles the modem
will hang-up, reset the modem, and
enter the COMMAND mode.
&F - - Y Y Set modem to factory defaults
&G0 - - Y Y Disable the guard tone operation.
&G1 - - Y Y Enable the guard tone, 550 Hz,
operation.
&G2 - - Y Y Enable the guard tone, 1800 Hz,
operation.
&J0 DIP DIP Y (F) Y (F) Select jack style RJ-11, RJ-41s,
RJ-45s
&J1 DIP DIP Y Y Select jack style RJ-12, RJ-13.
&L0 - - Y (F) Y (F) Set Dial-up phone line operation
&L1 - - Y Y Set Leased line operation
&P0 Preset Preset Y (F) Y (F) Set Make/Break ratio to USA, 39% make
/ 61% Break
&P1 - - Y Y Set Make/Break ratio to UK, 33% make
/ 67% Break
&S0 DIP DIP Y (F) Y (F) DSR always forced active
&S1 DIP DIP Y Y DSR active on connection, CCITT
V.22bis
&Vn - - - Y Display active user configuration and
stored phone numbers.
&W - - Y - Store user configuration in
nonvolatile memory
&Wn - - - Y Store user configuration in
nonvolatile memory n
&Yn - - - Y Designate user configuration to use
with hard reset.
&Zn - - Y - Store Phone number, n, in nonvolatile
memory
&Zn=x - - - Y Store Phone number, x, in nonvolatile
memory location n
Test Commands:
O1 - Y - - Terminate remote digital loopback
O2 - Y - - Request remote digital loopback from
the remote modem.
S16=0 Y Y - - End test and return to COMMAND mode.
S16=1 Y Y - - Initiate local analog loopback.
S16=4 - Y - - Initiate local digital loopback.
&T0 - - Y Y End any active test and return to
COMMAND mode
&T1 - - Y Y Initiate local analog loopback.
&T3 - - Y Y Initiate local digital loopback.
&T4 - - Y Y Enable modem granting RMT digital
loopback requests
&T5 - - Y Y Disable modem granting RMT digital
loopback requests
&T6 - - Y Y Request RMT modem to enter RMT
digital loopback.
&T7 - - Y Y Request RMT modem to enter RMT
digital loopback with self test
&T8 - - Y Y Initate local analog loopback with
self test.
(F) Factory default
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