basic AT
Command
set |
Function |
A/ |
Re-execute command. |
A |
Go off-hook and attempt to answer a
call. |
B0 |
Select V.22 connection at 1200 bps. |
B1 |
Select Bell 212A connection at 1200 bps. |
C1 |
Return OK message. |
Dn |
Dial modifier. |
E0 |
Turn off command echo. |
E1 |
Turn on command echo. |
F0 |
Select auto-detect mode (equivalent to
N1). |
F1 |
Select V.21 or Bell 103. |
F2 |
Reserved. |
F3 |
Select V.23 line modulation. |
F4 |
Select V.22 or Bell 212A 1200 bps line
speed. |
F5 |
Select V.22 bis line modulation. |
F6 |
Select V.32 bis or V.32 4800 line
modulation. |
F7 |
Select V.32 bis 7200 line modulation. |
F8 |
Select V.32 bis or V.32 9600 line
modulation. |
F9 |
Select V.32 bis 12000 line modulation. |
F10 |
Select V.32 bis 14400 line modulation. |
H0 |
Initiate a hang-up sequence. |
H1 |
If on-hook, go off-hook and enter
command mode. |
I0 |
Report product code. |
I1 |
Report pre-computed checksum. |
I2 |
Report OK. |
I3 |
Report firmware revision, model, and
interface type. |
I4 |
Report response programmed by an OEM. |
L0 |
Set low speaker volume. |
L1 |
Set low speaker volume. |
L2 |
Set medium speaker volume. |
L3 |
Set high speaker volume. |
M0 |
Turn speaker off. |
M1 |
Turn speaker on during handshaking and
turn speaker off while receiving carrier. |
M2 |
Turn speaker on during handshaking and
while receiving carrier. |
M3 |
Turn speaker off during dialing and
receiving carrier and turn speaker on during answering. |
N0 |
Turn off automode detection. |
N1 |
Turn on automode detection. |
O0 |
Go on-line. |
O1 |
Go on-line and initiate a retrain
sequence. |
P |
Force pulse dialing. |
Q0 |
Allow result codes to DTE. |
Q1 |
Inhibit result codes to DTE. |
Sn |
Select S-Register as default. |
Sn? |
Return the value of S-Register n. |
=v |
Set default S-Register to value v. |
? |
Return the value of default S-Register. |
T |
Force DTMF dialing. |
V0 |
Report short form (terse) result codes. |
V1 |
Report long form (verbose) result codes. |
W0 |
Report DTE speed in EC mode. |
W1 |
Report line speed, EC protocol and DTE
speed. |
W2 |
Report DCE speed in EC mode. |
X0 |
Report basic call progress result codes,
i.e., OK, CONNECT, RING,
NO CARRIER (also, for busy, if enabled, and
dial tone not detected), NO ANSWER and ERROR. |
X1 |
Report basic call progress result codes
and connections speeds: OK, CONNECT, RING,
NO CARRIER (also, for busy, if enabled, and
dial tone not detected), NO ANSWER, CONNECT XXXX, and ERROR. |
X2 |
Report basic call progress result codes
and connections speeds, i.e., OK,CONNECT, RING,
NO CARRIER (also, for busy, if enabled, and
dial tone not detected), NO ANSWER, CONNECT XXXX, and ERROR. |
X3 |
Report basic call progress result codes
and connection rate, i.e., OK, CONNECT, RING,
NO CARRIER, NO ANSWER, CONNECT XXXX, BUSY,
and ERROR. |
X4 |
Report all call progress result codes
and connection rate, i.e., OK, CONNECT, RING,
NO CARRIER, NO ANSWER, CONNECT XXXX, BUSY,
NO DIAL TONE and ERROR. |
Y0 |
Disable long space disconnect before
on-hook. |
Y1 |
Enable long space disconnect before
on-hook. |
Z0 |
Restore stored profile 0 after warm
reset. |
Z1 |
Restore stored profile 1 after warm
reset. |
&C0 |
Force RLSD active regardless of the
carrier state. |
&C1 |
Allow RLSD to follow the carrier state. |
&D0 |
Interpret DTR ON-to-OFF transition per
&Qn:
&Q0, &Q5, &Q6: The modem ignores
DTR.
&Q1, &Q4: The modem hangs up.
&Q2, &Q3: The modem hangs up. |
&D1 |
Interpret DTR ON-to-OFF transition per
&Qn:
&Q0, &Q1, &Q4,. &Q5,
&Q6: Asynchronous escape.
&Q2, &Q3: The modem hangs up. |
&D2 |
Interpret DTR ON-to-OFF transition per
&Qn:
&Q0 through &Q6: The modem hangs up. |
&D3 |
Interpret DTR ON-to-OFF transition per
&Qn:
&Q0, &Q1, &Q4,. &Q5,
&Q6: The modem performs soft reset.
&Q2, &Q3: The modem hangs up. |
&F0 |
Restore factory configuration 0. |
&F1 |
Restore factory configuration 1. |
&K0 |
Disable DTE/DCE flow control. |
&K3 |
Enable RTS/CTS DTE/DCE flow control. |
&K4 |
Enable XON/XOFF DTE/DCE flow control. |
&K5 |
Enable transparent XON/XOFF flow
control. |
&K6 |
Enable both RTS/CTS and XON/XOFF flow
control. * Serial interface operation only. |
&M0 |
Select direct asynchronous mode. |
&M1 |
Select sync connect with async off-line
command mode. * |
&M2 |
Select sync connect with async off-line
command mode and enable DTR dialing of directory zero. * |
&M3 |
Select sync connect with async off-line
command mode and enable DTR to act as Talk/Data switch. * |
&Q0 |
Select direct asynchronous mode. |
&Q1 |
Select sync connect with async off-line
command mode. * |
&Q2 |
Select sync connect with async off-line
command mode and enable DTR dialing of directory zero. * |
&Q3 |
Select sync connect with async off-line
command mode and enable DTR to act as Talk/Data switch. * |
&Q4 |
Select Hayes AutoSync mode. |
&Q5 |
Modem negotiates an error corrected
link. |
&Q6 |
Select asynchronous operation in normal
(buffered) mode. |
&R0 |
CTS tracks RTS (async) or acts per V.25
(sync). |
&R1 |
CTS is always active. |
&S0 |
DSR is always active. |
&S1 |
DSR acts per V.25. |
&T0 |
Terminate any test in progress. |
&T1 |
Initiate local analog loopback. |
&T2 |
Returns ERROR result code. |
&T3 |
Initiate local digital loopback. |
&T4 |
Allow remote digital loopback. |
&T5 |
Disallow remote digital loopback
request. |
&T6 |
Request an RDL without self-test. |
&T7 |
Request an RDL with self-test. |
&T8 |
Initiate local analog loop with
self-test. |
&V |
Display current configurations. |
&W0 |
Store the active profile in NVRAM
profile 0. |
&W1 |
Store the active profile in NVRAM
profile 1. |
&Y0 |
Recall stored profile 0 upon power up. |
&Y1 |
Recall stored profile 1 upon power up. |
&Zn=x |
Store dial string x (to 35) to location
n (0 to 3 depending upon modem model). |
\G0 |
Disable modem to modem flow control. |
\G1 |
Enable modem to modem flow control. |
\N0 |
Select normal speed buffered mode. |
\N1 |
Select direct mode. |
\N2 |
Select reliable link mode. |
\N3 |
Select auto reliable mode. |
\N4 |
Force LAPM mode. |
\N5 |
Force MNP mode. |
\P0 |
Enable Auto Dial via DTR off to on
sequence |
\P1 |
Disable Auto Dial (default) |
%C0 |
Disable data compression. |
%C1 |
Enable MNP 5 data compression. |
%C2 |
Enable V.42 bis data compression. |
%C3 |
Enable both V.42 bis and MNP 5
compression. |