hayes at commands
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The Hayes AT command setis the industry standard method of
communicating with and setting up a modem. These represent
commands for the Rockwell chipsets.
Syntax rules
Hayes AT Commands Listing
SMS commands
AT Command Result Codes
Country Settings
S Registers
Syntax Rules
A command string should start with "AT" or "at", except for the commands "A/" and "+++".
At or aT are invalid.
Several commands can be given in one command string.
The commands can be given in upper or lower case.
A command string should contain less than 40 characters.
When an error is made during the typing of the command, it can be corrected using the
backspace key.
Commands and command strings must be terminated with an , except +++ and A/
A telephone number can exist of following characters:
1 2 3 4 5 6 7 8 9 * = , ; # + > . All other characters are ignored (space, underscore ). They
help formatting the dialstring.
Commands that use a numerical parameter, can be used without a numerical value. In this
case the command will be issued with the value zero.
If the command string contains two consecutive commands without parameter, as discussed
above, the modem will respond with an error.
After the command ATZ has been issued, a pause of two seconds should be respected
before entering the next commands.
IMPORTANT: The commands below are standard Hayes AT commands, and will work with the
Option 2-in-1 modem. Some vendors implement their own AT commands which will only work
with their brand/model of modem.
Hayes AT Commands
AT or at always precedes a command. The modem needs these two letters to adjust itself to the
settings of the PCs comport. The modem then switches automatically to the defined baud rate
http://home.intekom.com/option/hayesat.htm#S-Registershttp://home.intekom.com/option/hayesat.htm#Supported%20countrieshttp://home.intekom.com/option/hayesat.htm#AT%20Command%20Result%20Codeshttp://home.intekom.com/option/hayesat.htm#Hayes%20AT%20Commandshttp://home.intekom.com/option/hayesat.htm#S-Registershttp://home.intekom.com/option/hayesat.htm#Supported%20countrieshttp://home.intekom.com/option/hayesat.htm#AT%20Command%20Result%20Codeshttp://home.intekom.com/option/faq59.htmhttp://home.intekom.com/option/hayesat.htm#Hayes%20AT%20Commandshttp://home.intekom.com/option/hayesat.htm#Syntax%20Rules -
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and parity, until the next command is issued or the modem is turned off. The modem will not
respond to any commands not preceded by an AT.
The modem recognises following formats :
1 or 0 start bits, 7 or 8 data bits, no, odd or even parity and 1 or 2 stop bits.
The commands can be issued at a rate between 300 and 115,000bps. In V.23 mode, the
commands are sent at 1,200bps. The modems replies are then sent at 75bps to the PC.
The command interpreter recognizes AT and at, but not At or aT. Both characters have to be
sent in upper- or lowercase and must be sent directly after one another.
+++ Switch from data mode to command mode without dropping the line. A second
before and after this command, no other character may be sent to the modem, including
a .
A/Repeat last command, no
ATAAnswer incoming call
When you want to answer a call manually, you type this command after a ring has appeared on
the sc reen of your Terminal emulator.
DDial a telephone number
ATDTn After issuing this command, the modem will attempt to establish a connection and dial the
number n.
Options to the command D:
W Wait for dialtone. When using a PABX this is used to wait for the second dialtone.
Note: not all PABXs give a second dialing tone. Consider using "@" instead.
@ Wait for silence for 5 seconds.
, Pause for 2 seconds (S8)
! Flash ( on-hook for value in S29 )
; Return to command mode after dialing.
P Pulse dial
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T Tone dial
n The telephone number to be dialed
Sn Dial number stored in directory entry &Zn where n=0..19. The selected number is shown
on the screen for verification.
J Perform MNP10 link negotiation at highest supported speed (for this call only).
L Redial last number.
^ Disable calling tone, this call only.
The call can be aborted at any stage before the connect message appears, by entering any
character except Linefeed.
ATECommand echo to host
E0 Commands are not echoed
E1 Commands are echoed
With this command you can select if the modem should return all the commands to the screen or
not. This is useful to check if all characters are received by the modem. If characters appear
double on the screen, disable echoing by the modem or by your terminal. The value of ATE can be
written in the RAM of the modem using AT&W.
ATFnSelect transmission mode/speed
F0 Auto mode
F1 V.21 300bps
F3 V.23 75Tx/1200Rx with AT%F1
V.23 1200Tx/75Rx with AT%F2
F4 V.22 1,200bps
F5 V.22bis 2,400bps
F6 V.32bis 4,800bps
F7 V.32bis 7,200bps
F8 V.32bis 9,600bps
F9 V.32bis 12,000bps
F10 V.32bis 14,400bps
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These commands are not valid for V.34 modems. The equivalent command for the V.34 modems is
+MS, please refer to this command.
ATHGo on-hook, hang up.
H0 Go on-hook ( Hang up )
H1 Go off-hook
ATIIdentifiers
I0 Product code
I1 Pre-computed Checksum
I2 Returns OK
I3 Returns OK
I4 OEM String
I5 - I11 Returns OK
I12 ROM Checksum
I13 RC Version number
I14 Shows Firmware version
I15 Shows selected country
I17 GSM option
I18 Shows Supported GSM Kit (GSM-ready only)
ATLSpeaker volume settings
L0 Lowest speaker volume
L1 Low speaker volume
L2 Medium speaker volume
L3 Highest speaker volume
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With this command the speaker volume can be set.
ATMSpeaker control
M0 Speaker always off
M1 Speaker on until carrier detected
M2 Speaker always on
M3 Speaker on only while answering
ATNnSelect Auto mode
N0 Auto mode disabled
N1 Auto mode enabled
This command is not longer valid for the V.34 modems.
ATOnReturn to data mode
O0 Return to data mode from command mode, only if on-line.
O1 Return on-line and initiate retrain (2400bps or higher)
ATQnResult codes
Q0 Modem returns result codes
Q1 Quiet mode enabled. Modem gives no result codes.
If the quiet mode is enabled, the responses from the modem are not sent to the PC.
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ATSnSets and reads the selected register
Sn=x Sets register n to the value x
Sn? Reads the value of register n
n is a numeric value, varying between 0 and 255 (depending on the register).
ATVnResult codes in numerical or verbose form
V0 Returns the code in numerical form
V1 Full-word result codes
ATWnConnect messages formatting
W0 DTE rate ( connect rate )
W1 Hayes 4 line format : Carrier, Protocol, Compression, DTE rate
W2 Result code is DCE rate ( carrier rate )
ATXnExtended Result codes
X1 Ignore dialtone and busy tone
X2 Ignore busy tone
X3 Inner dialtone
X4 Modem recognises dialtone and busy tone
X3 and X1 set the modem for Blind Dialing. This option is country specific, because some countries
do not allow blind dialing.
ATYnLong Space disconnect
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Y0 Disable long space disconnect
Y1 Enable long space disconnect
If the modems receives after activating this function, a BREAK-signal of at least 1.6 seconds
coming from the remote PC, it will send a BREAK-signal of 4 seconds back to the remote PC before
hanging up the telephone line.
ATZnResetting the modem
Z0 Restore stored profile 0
Z1 Restore stored profile 1
If this command is issued to the modem during a connection, the modem will drop the line.
According to the parameter n, the modem will restore the values stored in the non-volatile RAM
(See also &W ).
AT&CnCarrier-detect
&C0 DCD is always active
&C1 DCD is active if modem is on-line
Data Carrier Detect (DCD) is a hardware signal that notifies the software that the modem is in
communication with another modem. Most softwares will not start-up properly if the DCD is
active. Default is &C1.
AT&DnData Terminal Ready settings
&D0 Modem ignores DTR
&D1 Go to command mode on ON-to-OFF DTR transition.
&D2 Hang up on DTR-drop and go to command mode
&D3 Reset (ATZ) on DTR-drop. Modem hangs up.
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AT&FRestore Factory Settings
&F0 Use profile 0
&F1 Use profile 1
The modem is reset to the default firmware settings. If the modem is on-line, the command will
not be executed.
AT&GnSelect guard tone
&G0 Disables guard tone
&G1 Disables guard tone
&G2 Selects 1800Hz guard tone
This command may not be permitted in some countries.
AT&KnFlow Control
&K0 Flow control disabled
&K3 RTS/CTS flow control (Hardware)
&K4 XON/XOFF flow control (Software)
&K5 Transparent XON/XOFF flow control
&K6 RTS/CTS and XON/XOFF flow control
Flow control is the use of characters or RS232 signals to start and stop the flow of data to avoid
data loss during buffering. This is extremely important when the DTE/DCE rate is different from the
line speed, e.g. when data compression is used. The DTE/DCE rate must be higher then the line
speed.
RTS/CTS flow control (Hardware flow control)
The PC will send data to the modem. The modem will store this data in a buffer. When this buffer
is full, the modem will drop the CTS-line, telling the PC that it has to stop transmitting data until
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the signal raises again. If the RTS-signal is OFF, transmitting data to the PC is stopped until the
signal switches to ON.
XON/XOFF flow control (Software flow control)
If the modem receives a XON-character (S32) from the PC, it stops transmitting data to the PC
until it receives a XOFF-character (S33). The process is similar if the PC is sending data to the
modem.
NOTE : The preferable setting is RTS/CTS flow control
AT&PnPulse dial make-break
&P0 : 61/39 ratio at 10pps
&P1 : 67/33 ratio at 10pps
&P2 : 39/61 ratio at 20pps
&P3 : 33/67 ratio at 20pps
Settings may be locked depending on country selection. Default is also country dependent.
AT&QnSync/Async Mode
&Q0 : Selects direct async operation.
&Q1 : Selects synchronous connect mode with async off-line command mode.
&Q2 : Selects synchronous connect mode with async off-line command mode and enables DTRdialing.
&Q4 : Selects Autosync mode
&Q5 : The modem will try to negotiate an error corrected link.
&Q6 : Selects async operation in normal mode.
This command is used to control the connection modes permitted.
AT&RnCTS/RTS option
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&R0 : In sync mode, CTS tracks the state of RTS. In async mode, CTS acts according V.25bis
handshake.
&R1 : In sync mode CTS is always on. In async mode, CTS will drop only if required by flow
control.
This selects how the modem controls CTS. CTS operation is modified if hardware FC is selected (
AT&Kn ).
AT&SnDSR Override
&S0 : DSR will remain on at all times.
&S1 : DSR will become active after answer tone has been detected and inactive after the carrier
has been lost.
This command selects how the modem will control DSR.
AT&TnTest and diagnostics
&T0 : Terminates test
&T1 : Initiates local analogue loop back
&T2 : Returns ERROR
&T3 : Initiates local digital loop back
&T4 : Enables digital loop back acknowledgment for remote request.
&T5 : Disables digital loop back acknowledgment for remote request.
&T6 : Requests a remote digital loop back without self test.
&T7 : Requests a remote digital loop back with self test
&T8 : Initiates local analogue loop back with self test.
The modem will perform selected test and diagnostic functions according to the parameter
supplied. A test can be run only when in an asynchronous operation in non-error-correction mode.
To terminate a test in progress, the escape sequence must be entered first, except forparameters 7 and 8.
AT&Vn Display current configuration and stored profiles
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Reports the current (active) configuration, the stored (user) profiles, and the first four stored
telephone numbers.
AT&WnStore current configuration
&W0 : Store current configuration in profile 0
&W1 : Store current configuration in profile 1
AT&XnSelect Synchronous Clock Source
&X0 : Selects internal timing
&X1 : Selects external timing
&X2 : Selects slave receive timing
Selects the source of the transmit c lock for the synchronous mode of operation.
AT&YnDesignate a default reset profile
&Y0 : The modem will use profile 0
&Y1 : The modem will use profile 1
Selects which user profile will be used after a hard reset.
AT&ZnStore telephone number
&Zn=x n=0 to 3 and x=dial string
AT%EnLQM and Auto-retrain or FB/FF
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%E0 : Disable Line Quality Monitor and auto-retrain
%E1 : Enable Line Quality Monitor and auto-retrain
%E2 : Enable Line Quality Monitor and fall back/fall forward. (V.34 only)
Controls whether or not the modem will automatically monitor the line quality and request a retrain
or fall back / fall forward depending on the line quality.
AT%CnEnable/Disable data compression
%C0 : Disables data compression
%C1 : Enables MNP5
%C2 : Enables V.42bis
%C3 : Enables both V.42bis and MNP5 data compression.
Enables or disables data compression negotiation. The modem can only perform data compression
on an error corrected link.
AT\GnModem to modem flow control
\G0 : Disables modem-to-modem flow control
\G1 : Enables modem-to-modem flow control
In non-error correction mode, the modem enables or disables the generation or recognition of
modem to modem XON/XOFF flow control according to the parameter supplied. In error correctionmode, the setting of \G is ignored.
AT\NnOperating mode
\N0 : Normal speed buffered mode. (&Q6)
\N1 : Serial interface selected. (&Q0)
\N2 : Reliable connection ( First V.42 the MNP4). Failure to make a reliable connection results in
modem hanging up.
\N3 : Auto reliable mode ( First V.42, then MNP4 then speed buffered )
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\N4 : V.42 (LAPM) . If connection fails, modem hangs up.
\N5 : MNP4 EC mode. Failure results in hanging up.
This command controls the preferred error correcting mode to be negotiated in a subsequent data
connection.
\AnSelect maximum MNP block size
\A0 64 characters
\A1 128 characters
\A2 192 characters
\A3 256 characters
)MnEnable cellular power level adjustment
)M0 : Disables transmit power level adjustment during MNP10 link negotiation.
)M1 : Enables transmit power level adjustment during MNP10 link negotiation. V.34 : Uses the@Mn value to establish initial cellular connection. After connection power level is determined by
modem.
)M2 : Enables transmit power level adjustment during MNP10 link negotiation. Uses the @Mn value
to establish initial cellular connection. After connection power level is fixed. (V.34 only)
Enables or disables automatic adjustment of the transmit power level to accommodate the
signaling requirements of cellular telephone equipment.
-KnMNP Extended Services
-K0 Disables V.42 LAPM to MNP10 conversion
-K1 Enables V.42 LAPM to MNP10 conversion
-K2 Enables V.42 LAPM to MNP10 conversion, inhibits MNP ES initiation during V.42 LAPM
answering mode detection Phase (V.34 only)
Enables or disables conversion of a V.42 connection to a MNP10 connection.
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V.34 Commands
Following commands are valid only for the V.34 modems.
@MnInitial Cellular Power Level set ting
@M0 -26dBm (Default)
@M1 -30dBm
@M2 -10dBm
@M3-@M10 -10dBm
@M11 -11dBm
...
@M31 -31dBm
Sets the initial power level for up shift at connect until line conditions can be determined.
:EnCompromise Equalizer Enable command
:E0 Disables the equalizer
:E1 Enables the equalizer
Enables or disables the V.32 compromise equalizer. This command can be used when the modem is
attached to either a flat line or a cellular connect ion.
+MSSelect Modulation
Note : The use of the Nn command is not recommended for speeds higher than 14.400.
Syntax:
+MS=[,[][,[][,[max_rate>]]]]
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+MS? Reports selected options
response : +MS:11,1,300,33600 (example)
+MS=? Reports supported options
response : +MS:(0,1,2,3,8,9,10,13,64,69,74),(0,1),(300-33600),(300-33600)
Sub parameter definitions:
1. Mod
Modulation Bps
0 V.21 300
1 V.22 1200
2 V.22bis 2400 or 1200
3 V.23 1200/75
9 V.32 9600,4800
10 V.32bis 14400,9600,7200,
4800,1200
11 V.34 33600,32100,28800,
26400,24000, 21600,
19200, 16800,
14400,9600,7200, 4800,
2400
64 Bell 103 300
69 Bell 212 1200
74 V.FC 28800,26400,24000,21600,
19200, 16800,
14400,9600,7200,4800,2400
2. is an optional numeric value which enables or disables automatic modulation
negotiation using V.8 or V.32bis Annex A. The options are :
0 Auto mode disabled
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1 Auto mode enabled using V.8 or V.32bis Annex A
The default value is 1, which enables auto mode. Note, however, there are modulations for which
there is no automatic negotiation, e.g., Bell 212.
=1
The modem connects at the highest possible rate in accordance with V.8 or V.32bis Annex A if
V.8 is not supported by the remote modem.
A. If is greater than the highest speed supported by then modulation specified by
, the modem auto modes down from the highest rate to the selected modulation. For
example : +MS=10,1,1200,24000 selects auto moding down from V.32bis 14400bps.
B. To emulate issuance of the N1 command, specify the modulation and the rate to start auto
moding down from using and , respectively. Examples :
+MS=11,1,300,16800 auto mode at V.34 16800bps
+MS=9,1,300,12000 auto mode at V.32bis 12000bps
3. is an optional number which specifies the lowest rate at which the modem may
establish a connection. The value is decimal coded, in units of BPS, e.g. 2400 specifies the lowest
rate to be 2400. The default is 300 for 300bps.
3. is an optional number which specifies the highest rate at which the modem may
establish a connection. The value is decimal coded, in units of BPS, e.g. 14400 specifies the
lowest rate to be 14400. The default is 33,600 for 33,600bps.
AT Command Result Codes
The modem responds to commands from the DTE ( PC ) and to activity on the line by signaling to
the DTE in the form of result codes. The result codes that the modem can send are described
below.
Value Verbose
0 OK
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1 RING
3 NO CARRIER
4 ERROR
5 CONNECT 1200
6 NO DIALTONE
7 BUSY
8 NO ANSWER
9 CONNECT 0600
10 CONNECT 2400
11 CONNECT 4800
12 CONNECT 9600
13 CONNECT 7200
14 CONNECT 12000
15 CONNECT 14400
16 CONNECT 19200
17 CONNECT 38400
18 CONNECT 57600
19 CONNECT 115200
22 CONNECT 75TX/1200RX
23 CONNECT 1200TX/75RX
24 DELAYED
32 BLACKLISTED
33 FAX
35 DATA
40 CARRIER 300
44 CARRIER 1200/75
45 CARRIER 75/1200
46 CARRIER 1200
47 CARRIER 2400
48 CARRIER 4800
49 CARRIER 7200
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50 CARRIER 9600
51 CARRIER 12000
52 CARRIER 14400
53 CARRIER 16800
54 CARRIER 19200
55 CARRIER 21600
56 CARRIER 24000
57 CARRIER 26400
58 CARRIER 28800
59 CARRIER 31200
60 CARRIER 33600
61 CONNECT 16800
62 CONNECT 21600
63 CONNECT 24000
64 CONNECT 26400
65 CONNECT 28800
66 CONNECT 33600
67 COMPRESSION: CLASS 5
68 COMPRESSION: V.42 bis
69 COMPRESSION: NONE
70 PROTOCOL: NONE
77 PROTOCOL: LAPM
80 PROTOCOL: ALT
81 PROTOCOL: ALT-CELLULAR
+F4 +FCERROR
Supported countries
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To change the country settings, use followingfollow next procedure :
AT*NCnn
Modem responds with OK
ATZ
Modem responds with OK
Note : Some counties do not allow their country settings to be altered.
*NCnnCountry select
40 Australia
1 Austria
2 Belgium
3 Denmark
4 Finland
5 France
6 Germany
17 Greece
10 Netherlands
7 Ireland
8 Italy
43 Japan
26 Namibia
11 Norway
12 Portugal
27 South Africa
13 Spain
14 Sweden
15 Switzerland
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16 UK
19 Czech Republic
24 Poland
25 Russia
22 United States
Note : Use the Interactive Manual to setup the country.
S-Registers
S0Auto-answer
Sets the number of the rings required before the modem automatically answers a call.
Setting this register to zero disables auto-answer mode
Range : 0 to 255
S1Ring counter
S1 is incremented each time the modem detects a ring signal on the telephone line.
Range : 0 to 255
S2Escape character
S2 holds the decimal value of the ASCII character used as the escape sequence. A value
over 127 disables the escape process.
Range : 0 to 127 (Default = 43)
S3Carriage Return Character
Sets the command line and result code terminator character. Pertains to asynchronous
operation only.
Range : 0 to 127 ASCII decimal (Default=13)
S4Line feed Character
Sets the character recognised as a line feed. Pertains to asynchronous operation only.
Range : 0 to 127 ASCII decimal (Default=10)
S5Backspace Character
Sets the character recognised as a backspace.
Range : 0 to 32 ASCII decimal (Default=8)
S6Wait for dialtone
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Sets the time in seconds that the modem will try to detect a dialtone (if set) and wait
before starting to dial.
Range : 2 to 255 seconds
S7Wait for Carrier after dial
Sets the time in seconds that the modem will wait for a carrier before hanging up.
Range : 1 to 255 seconds
S8Pause time for delay
Sets the time the modem must pause when the , dial modifier is used.
Range : 0 to 255 seconds
S9Carrier detec t response t ime
Sets the time in 10th of a second, that the carrier must be present before the modem
considers it valid and turns on RLSD.
Range : 1 to 255 tenths of a second.
S10Lost carrier to Hang-up delay
Sets the time in 10th of a second, that the modem waits before hanging up after a loss of
carrier.
Range : 1 to 255
S11DTMF Tone duration
Range : 50 to 255 milliseconds (Default=95)
S12Escape Prompt Delay
Defines the maximum period, in fifties of a second, allowed between receipt of the last
character of the three escape character sequence and the sending of the OK message.
Range : 0 to 255 1/50 of a second
S18Test timer
Sets the length in seconds that the modem conducts a test.
Range : 0 to 255 seconds
S25Delay to DTR
Sets the time that the modem will ignore DTR before taking action specified by &Dn.
Range : 0 to 255 seconds
S26RTS to CTS delay
Sets the time delay, before the modem turns on CTS after detecting an OFF-ON transition
on RTS when &R0 is commanded.
Range : 0 to 255 hundredths of a second
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S32XON Character
Range : 0 to 255 ASCII decimal (Default=17)
S33XOFF Character
Range : 0 to 255 ASCII decimal (Default=19)
S38Delay Before Forced Hang-up
This register sets the delay between the modems receipt of the H command to disconnect
and the disconnect operation.
Range : 0 to 255 seconds
S86Call Failure Reason Code
When the modem issues a NO CARRIER result code, a value is written to this S-register.
Range : 0,4,5,9,12,13 or 14
0 Normal disconnect, no error occurred
4 Loss of carrier
5 V.42 negotiation failed
9 The modems could not find a common protocol
12 Normal disconnect initiated by the remote modem
13 Remote modem does not respond after 10 re-transmissions of the same message.
14 Protocol violation
S91PSTN Transmit level Attenuation
Sets the transmit level attenuation level from 0 to 15dBm for the PSTN mode. Some
countries may not permit changing the transmit level.
Range : 0 to 15dBm (Corresponding to 0 to -15dBm transmit level)
Default : 10dBm
S95 Extended Result Codes
The bits in this register can be set to override some of the Wn command options. A bit
set to a 1 in this register will enable the corresponding result code regardless of the Wn
setting.
Bit 0 Connect message indicates DCE speed
Bit 1 Append /ARQ to CONNECT XXXX
Bit 2 Enable CARRIER XXXX message
Bit 3 Enable PROTOCOL message
Bit 4 Reserved
Bit 5 Enable COMPRESSION XXXX
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Bit 6 Reserved
Bit 7 Reserved
DisclaimerAll trademarks or product names mentioned herein are the property of their respective owners.
Specifications subject to change without notice. E&OE.This page serves m erely as an informa tional aid &, unless stated, does no t imply any endoresme nt of or by the
parties mentioned within.Copyright 1997/1998
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