AT Commands
Basic AT Commands
Command Function Command Function
A/ Re-execute command A Go off-hook and attempt to answer a call
B0 Select V.22 connect @1200 bps B1 Select Bell 212A connect @1200 bps
C1 Return OK message Dn Dial modifier
E0 Turn off command echo E1 Turn on command echo
H0 Initiate a hang-up sequence H1 If on-hook, go off-hook and enter
I0 Report product code command mode
I1 Report pre-computed checksum I2 Report “OK” if the calculated checksum
I3 Report firmware revision, model, equals the prestored checksum or if the
and interface type prestored checksum value is FFh
I4 Report response programmed by OEM I5 Report the country code parameter
I6 Report modem data pump model I7 Report the DAA code
and code revision 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 M2 Turn speaker on during handshaking and
and turn speaker off while receiving while receiving carrier
carrier M3 Turn speaker off during dialing and
N0 Turn off automode detection receiving carrier and turn speaker on
N1 Turn on automode detection during answering
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 n as default
Sn? Return the value of S-Register n Sn=v Set default S-Register n to value v
T Force DTMF dialing
V0 Report short form result codes V1 Report long form result codes
W0 Report DTE speed only W1 Report line speed, EC protocol and DTE
W2 Report DCE speed only speed
X0 Report basic call progress result codes, X1 Report basic call progress result codes
i. e., Ok, Connect, Ring, No Carrier and connections speeds (Ok, Connect,
(also, for busy, if enabled, and dial tone Ring, No Carrier (also, for busy, if
not detected), No Answer and Error enabled, and dial tone not detected), No
X2 Report basic call progress result codes Answer, Connect XXXX, and Error
and connections speeds, i.e., Ok, X3 Report basic call progress result codes
Connect, Ring, No Carrier (also, for and connections rate, i.e., Ok, Connect,
busy, if enabled, and dial tone not Ring, No Carrier, No Answer, Connect
detected), No Answer, Connect XXXX, XXXX, Busy, and Error
and Error Y0 Disable long space disconnect before onX4 Report all call progress result codes hook
and connections rate, i.e., Ok, Connect, Y1 Enable long space disconnect before on-
Ring, No Carrier, No Answer, Connect hook
XXXX, Busy, No Dial Tone and Error Z0 Restore stored profile 0 after warm reset
Z1 Soft reset and restore stored profile 1 &C0 Soft reset and force RLSD active
after warm reset regardless of the carrier state
&C1 Allow RLSD to follow the carrier state
&D0 Interpret DTR On-to-OFF transition &D1 Interpret DTR On-to-OFF transition
per &Qn per &Qn
&Q0, &Q5, &Q6 The modem ignores DTR &Q0, &Q1, &Q4, &Q5, &Q6 Asynchronous escape
&Q1, &Q4 The modem hangs up &Q2, &Q3 The modem hangs up
&Q2, &Q3 The modem hangs up
&D2 Interpret DTR On-to-OFF transition &D1 Interpret DTR On-to-OFF transition
per &Qn per &Qn
&Q0 through &Q6 The modem hangs up &Q0, &Q1, &Q4, &Q5, &Q6 Soft reset
Note: Bold face indicates default value
&Q2, &Q3 The modem hangs up
&F0 Restore factory configuration 0 &F1 Restore factory configuration 1
&G0 Disable guard tone &G1 Disable guard tone
&G2 Enable 1800 Hz guard tone &J0 Set S-Register response only for com&J1 Set S-Register response only for com- patibility
patibility &K0 Disable DTE/DCE flow control
&K3 Enable RTS/CTS DTE/DCE flow &K4 Enable XON/XOFF DTE/DCE flow
control control
&K5 Enable transparent XON/ XOFF &K6 Enable both RTS/CTS and XON/XOFF
flow control flow control
&L0 Select dial up line operation &M0 Select direct asynchronous mode
&M1 Select sync connect with async off- &M2 Select sync connect with async off-
line command mode line command mode and enable DTR
&M3 Select sync connect with async off- dialing of directory zero
line command mode and enable DTR &P0 Set 10 pps pulse dial with 39%/61%
to act as Talk/Data switch make/break
&P1 Set 10 pps pulse dial with 33%/67% &P2 Set 20 pps pulse dial with 39%/61%
make/break make/break
&P3 Set 20 pps pulse dial with 33%/67% &Q0 Select direct asynchronous mode
make/break &Q1 Select sync connect with async off&Q2 Select sync connect with async off- line command mode
line command mode and enable DTR &Q3 Select sync connect with async off-
dialing of directory zero line command mode and enable DTR
&Q4 Select Hayes AutoSync mode to act as Talk/Data switch
&Q5 Modem negotiates an error corrected &Q6 Select asynchronous operation in normal
link mode
&R0 CTS tracks RTS (sync) or CTS is &R1 CTS is always active (sync) or CTS is
normally ON and will turn OFF normally ON and will turn OFF
only if required by flow control (async) only if required by flow control (async)
&S0 DSR is always active &S1 DSR will become active after answer
&T0 Terminate any test in progress tone has been detected and inactive after
&T1 Initiate local analog loopback the carrier has been lost
&T2 Returns ERROR result code &T3 Initiate local digital loopback
&T4 Allow remote digital loopback (RDL) &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- &V Display current configuration and stored
test profiles
&V1 Display last connection statistics
&W0 Store the current configuration as &W1 Store the current configuration as
profile 0 profile 1
&X0 Select internal timing for the transmit &X1 Select external timing for the transmit
clock clock
&X2 Select slave receive timing for the &Y0 Recall stored profile 0 upon power up
transmit clock &Y1 Recall stored profile 1 upon power up
&Zn=x Store dial string x (up to 34 digits) %E0 Disable line quality monitor and auto
to location n (0 to 3) retrain
%E1 Enable line quality monitor and auto %E2 Enable line quality monitor and fallback/
retrain fall forward
%L Return received line signal level %Q Report the line signal quality
When modem receives a break from the DTE:
\K0,2,4 Enter on-line command mode, no \K1 Clear buffers and send break to remote
break sent to the remote modem modem
\K3 Send break to remote modem \K5 Send break to remote modem in sequence
immediately with transmitted data
When modem receives \B in on-line command state:
\K0,1 Clear buffers and send break to remote \K2,3 Send break to remote modem
immediately
modem
\K4,5 Send break to remote modem in sequence with transmitted data
When modem receives break from the remote modem:
\K0,1 Clear data buffers and send break to \K2,3 Send a break immediately to DTE
DTE \K4,5 Send a break with received data to the
DTE
\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
\V0 Connect messages are controlled \V1 Connect messages are displayed in the
by the command settings X, W, and S95 single line format
+MS Select modulation +H0 Disable Rockwell Protocol Interface
(RPI)
+H1 Enable RPI and set DTE speed to /Video ready mode
19200 bps +H2 Enable RPI and set DTE speed to 38400 bps
+H3 Enable RPI and set DTE speed to +H11 Enable RPI+ mode
57600 bps +H16 Enable Video Ready mode
**0 Download to flash memory at last **1 Download to flash memory at 38.4 kbps
sensed speed **2 Download to flash memory at 57.6 kbps
-SDR=0 Disable distinctive ring -SDR=1 Enable distinctive ring type 1
-SDR=2 Enable distinctive ring type 2 -SDR=3 Enable distinctive ring type 1 and 2
-SDR=4 Enable distinctive ring type 3 -SDR=5 Enable distinctive ring type 1 and 3
-SDR=6 Enable distinctive ring type 2 and 3 -SDR=7 Enable distinctive ring type 1, 2 and 3
ECC Commands
%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
\A0 Set maximum block size in MNP to 64 \A1 Set maximum block size in MNP to 128
\A2 Set maximum block size in MNP to 192\A3 Set maximum block size in MNP to 256
\Bn Send break of n x 100 ms
MNP 10 Commands
-K0 Disable MNP 10 extended services -K1 Enable MNP 10 extended services
-K2 Disable MNP 10 extended services -SEC=0 Disable MNP 10-EC
detection only
-SEC=1, [<tx level>] Enable MNP 10-EC and set transmit level<tx level> 0 to 30 (0 dBm to -30 dBm)
FAX Class 1
+Fclass=1 Service class +FAE=0 Disable data/fax auto answer
+FAE=1 Enable data/fax auto answer +FRH=n Receive data with HDLC framing
+FRM=n Receive data +FRS=n Receive silence, nx10 ms
+FTH=n Transmit data with HDLC framing +FTM=n Transmit data
+FTS=n Stop transmission and wait, nx10 ms
W-Class Commands
AT*Commends
*B
Display Blacklisted Number
*Cn
Data Calling tone (1300hz)selection
*NC
Country select
*NCn
Code(n) Country
0USA
1 Japan
2 Germany
3 UK(CTR-21)
4France
5 Austria
6 Italy
7 Australia
8Sweden
9 Denmark
10 New Zealand
11 Korea
12 China
13 Singapore
14 Malaysia
15 South Africa
16 Poland
17 Czechoslovakia
18 Hungary
19 Hong Kong
20 Turkey
21 Spain
%Tn
PTT Testing of Signal Level
%TT00_%TT09 Dual Tone Multifrequency ( DTMF ) tone dial digits 0 to 9
%TT0A DTMF digit *
%TT0B DTMF digit #
%TT0C DTMF digit A
%TT0D DTMF digit B
%TT0E DTMF digit C
%TT0F DTMF digit D
%TT10 V.21 Channel 1mark ( originate ) symbol.
%TT11 V.21 Channel 2mark symbol.
%TT15 V.22 originate signaling at 1200 bps
%TT16 V.22 bis originate signaling at 2400 bps
%TT17 V.22 answering signaling ( guard tone if PTT required).
%TT18 V.22 bis answer signaling (guard tone if required )
%TT19 V.21 Channel 1sapce symbol.
%TT1A V.21 Channel 2 space symbol.
%TT20 V.32 9600 bps.
%TT21 V.32 bis 14400 bps.
%TT30 Silence, i.e. Go off-hook.
%TT31 V.25 answer tone
%TT32 1800Hz guard tone
%TT33 V.25 calling tone ( 1300 Hz )
%TT34 Fax calling tone ( 1100 Hz )
%TT40 V.21 channel 2
%TT41 V.27 ter 2400 bps
%TT42 V.27 ter 4800 bps
%TT43 V.29 7200 bps
%TT44 V.29 9600 bps
%TT45 V.17 7200 bps long train
%TT46 V.17 7200 bps short train
%TT47 V.17 9600 bps long train
%TT48 V.17 9600 bps short train
%TT49 V.17 12000 bps long train
%TT4A V.17 12000 bps short train
%TT4B V.17 14400 bps long train
%TT4C V.17 14400 bps short train
%TT60 2400 bps ( V.34 only )
%TT61 4800 bps ( V.34 only )
%TT62 7200 bps (V.34 only )
%TT63 9600 bps (V.34 only )
%TT64 12000 bps (V.34 only)
%TT65 14400 bps
%TT66 16800 bps
%TT67 19200 bps
%TT68 21600bps
%TT69 24000 bps
%TT6A 26400bps
%TT6B 28800bps
%TT6C 31200bps
%TT6D 33600bps
S-Registers
Register Function Range/units Default
S0 Rings to auto-answer 0-255/rings 0
S1 Ring counter 0-255/rings 0
S2 Escape character 0-255/ASCII 43
S3 Carriage return character 0-127/ASCII 13
S4 Line feed character 0-127/ASCII 10
S5 Backspace character 0-255/ASCII 8
S6 Wait time for dial tone 2-255/s 2
S7 Wait time for carrier 1-255/s 50
S8 Pause time for dial delay modifier 0-255/s 2
S9 Carrier detect response time 1-255/.1 s 6
S10 Carrier loss disconnect time 1-255/.1 s 14
S11 DTMF tone duration 50-255/.001 s 95
S12 Escape prompt delay 0-255/.02 s 50
S14 General bit mapped options status 138 (8Ah)
S16 Test mode bit mapped options status (&T) 0
S18 Test timer 0-255/s 0
S19 AutoSync options 0
S20 AutoSync HDLC address or BSC 0-255 0
Sync character
S21 V.24/general bit mapped options status 52 (34h)
S22 Speaker/results bit mapped options status 117 (75h)
S23 General bit mapped options status 62 (3Dh)
S24 Sleep inactivity timer 0-255/s 0
S25 Delay to DTR off 0-255/s or .01s 5
S26 RTS-to-CTS delay 0-255/.01 s 1
S27 General bit mapped options status 73 (49h)
S28 General bit mapped options status 0
S29 Flash dial modifier time 0-255/10 ms 70
S30 Disconnect inactivity timer 0-255/10 s 0
S31 General bit mapped options status 194 (C2h)
S32 XON character 0-255/ASCII 17 (11h)
S33 XOFF character 0-255/ASCII 19 (13h)
S36 LAPM failure control 7
S37 Line connection speed 0
S38 Delay before forced hangup 0-255/s 20
S39 Flow control bit mapped options status 3
S40 General bit mapped options status 104 (68h)
S41 General bit mapped options status 195(C3h)
S46 Data compression control 138
S48 V.42 negotiation control 7
S82 LAPM break control 128 (40h)
S86 Call failure reason code 0-255
S91 PSTN transmit attenuation level 0-15/dBm 10 (country dependent)
S92 Fax transmit attenuation level 0-15/dBm 10 (country dependent)
S95 Result code messages control 0
Result Code Summary
OK 0 CONNECT 1
RING 2 NO CARRIER 3
ERROR 4 CONNECT 1200 5
NO DIAL TONE 6 BUSY 7
NO ANSWER 8 CONNECT 0600 9
CONNECT 2400 10 CONNECT 4800 11
CONNECT 9600 12 CONNECT 7200 13
CONNECT 12000 14 CONNECT 14400 15
CONNECT 19200 16 CONNECT 38400 17
CONNECT 57600 18 CONNECT 115200 19
CONNECT 230400 20 CONNECT 75TX/1200RX 22
CONNECT 1200TX/75RX 23 DELAYED 24
BLACKLISTED 32 FAX 33
DATA 35 CARRIER 300 40
CARRIER 1200/75 44 CARRIER 75/1200 45
CARRIER 1200 46 CARRIER 2400 47
CARRIER 4800 48 CARRIER 7200 49
CARRIER 9600 50 CARRIER 12000 51
CARRIER 14400 52 CARRIER 16800 53
CARRIER 19200 54 CARRIER 21600 55
CARRIER 24000 56 CARRIER 26400 57
CARRIER 28800 58 CONNECT 16800 59
CONNECT 21600 61 CONNECT 24000 62
CONNECT 26400 63 CONNECT 28800 64
COMPRESSION: CLASS 5 66 COMPRESSION: V.42 bis 67
COMPRESSION: NONE 69 PROTOCOL: NONE 70
PROTOCOL: LAPM 77 CARRIER 31200 78
CARRIER 33600 79 CONNECT 33600 84
CONNECT 31200 91 CARRIER 32000 150
CARRIER 34000 151 CARRIER 36000 152
CARRIER 38000 153 CARRIER 40000 154
CARRIER 42000 155 CARRIER 44000 156
CARRIER 46000 157 CARRIER 48000 158
CARRIER 50000 159 CARRIER 52000 160
CARRIER 54000 161 CARRIER 56000 162
CONNECT 32000 165 CONNECT 34000 166
CONNECT 36000 167 CONNECT 38000 168
CONNECT 40000 169 CONNECT 42000 170
CONNECT 44000 171 CONNECT 46000 172
CONNECT 48000 173 CONNECT 50000 174
CONNECT 52000 175 CONNECT 54000 176
CONNECT 56000 177 +FCERROR +F4
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