1. Hayes Compatible AT Command Set
COMMAND DESCRIPTION
+++ Escape to command mode
Upon on-line mode, it will remain the connection and switch
the modem to command mode. The character of "Escape command"
is defined by S-Register "S2".
ATA Answer command
The modem will go off-hook and attempt to answer incoming call.
A/ Repeat last command
ATBn Select CCITT or BELL Mode, where n = 0 or 1
n=0 CCITT Mode
n=1 BELL Mode (Default)
ATDstring Dial command, where "string" is the combination of the
following parameters and modifiers:
0 - 9 Dial Digit
* The "star" digit on tone dialing mode
# The "gate" digit on tone dialing mode
Dial modifiers:
P Pulse dial.
T Tone dial.
W Wait for dial tone.
, Pause.
! Flash.
; Command append.
S=n Dial a stored number.
ATEn Command Echo
The modem enables or disables the echo of character to the DTE
according to the parameter supplied. The parameter value, if
valid, is written to S14 bit 1.
ATE0 Do not echo commands
ATE1 Echo commands (Default)
ATHn Disconnect (Hang-Up)
This command initiates a hang up sequence.
ATH0 The modem will release the line if the modem is currently
on-line,and will terminate any test (AT&T) that is in
progress.Country specific,modulation specific,and error
correction protocol specific(S38) processing is handled
outside of the H0 command.
ATH1 If on-hook,the modem will go off-hook and enter command
mode.For US models,the modem will remain off-hook,For
W-class models,the modem will return on-hook after a
period of time determined by S7.
ATIn Identification
The modem reports to the DTE the requested result according to the
command parameter.
ATI0 Reports product code(e.g.,"33600").
ATI1 Reports a precomputed checksum (normally "255").
ATI2 Reports "OK".
ATI3 Reports firmware revision (VX.XXX)
ATI4 Reports OEM defined identifier string
ATI5 Reports Country Code parameter
ATI6 Reports modem data pump model and internal code revision
e.g.,RC288DPi Rev CE).
ATI7 Reports "255"
ATLn Speaker Volume Controls
The modem sets the speaker volume control according to the parameter
supplied. The parameter value,if valid,is written to S22 bits 0 and
1.
ATL0 Low volume.
ATL1 Low volume (Default).
ATL2 Medium volume.
ATL3 High volume.
ATMn Speaker Control
This command selects when the speaker will be on or off.The parameter
value, if valid,is written to S22 bits 2 and 3.
ATM0 Speaker is always off.
ATM1 Speaker is on during call establishment,but off when receiving
carrier.(Default.)
ATM2 Speaker is always on.
ATM3 Speaker is off when receiving carrier and during dialing,but
on during answering.
ATNn Automode Enable
This command enables or disables Automode detection(see+MS command).
The parameter value,if valid,is written to S31 bit1.
ATN0 Automode detection is disabled(equivalent to setting the +MS
<automode>subparameter to 0). A subsequent handshake will be
conducted according to the contents of S37 or, if S37 is zero
, according to the most recently sensed DTE speed.
ATN1 Automode detection is enabled (equivalent to setting the +MS <automode>
subparameter to 1). A subsequent handshake will be conducted according
the automode algorithm supported by the modem, e.g., according to the
contents of S37 or, if S37 is zero, starting at 28800 bps V.34 (RC288). This
command is also equivalent to F0 (RC144). (Default.)
ATOn Return to On-Line Data Mode
This command determines how the modem will enter the on-ling data mode
. If the modem is in the off-line command mode (no connection),
ERROR is reported.
ATO0 Enters on-line data mode without a retrain. Handling is
determined by the Call Establishment task. Generally, if a
connection exists, this command connects the DTE back to the
remote modem after an escape(+++).
ATO1 Enters on-line data mode with a retrain before returning to
on-line data mode.
ATP Set Pulse Dial Default
This command forces pulse dialing until the next T dial modifier or
T command is received. It also sets S14 bit 5.
As soon as a dial command is executed which explicitly specifies the
dialing mode for that particular call (e.g.,ATDT...), this command is
overridden so that all future dialing will be tone dialed.
This command may not be permitted in some countries.
ATQn Quiet Results Codes Control
The command enables or disables the sending of result codes to the DTE
according to the parameter supplied.The parameter value, if valid, is
written to S14 bit 2.
ATQ0 Enables result codes to the DTE (Default.)
ATQ1 Disables result codes to the DTE.
ATSn Read/Write S-Register
The modem selects an S-Register, performs an S-Register read or write
function, or reports the value of an S-Register.
Sn Establishes S-Register n as the last register accessed.
Sn=v Sets S-Register n to the value v.
Sn=? Repotrs the value of S-Register n.
The parameter n can be omitted,in which case the last S-Register
accessed will be assumed. The S can be omitted for AT=and AT?, in
which case the S-Register accessed will be assumed.
For example:
ATS7 establishes S7 as the last accessed register.
AT=40 sets the contents of the last register accessed to 40.
ATS=20 sets the contents of the last register accessed to 20.
If the number "n" is beyond the range of the S-Registers available,
the modem will return the ERROR message. The value "V'is "MOD"ed with
256. If the result is outside the range permitted for a given S-Register the values will
still be stored, but functionally the lower and higher limits will be observed. Input and
output are always indecimal format. Note that some S Registers are read-only.
In some cases,writing to the S-Register will appear to be accepted
but the value will not actually be written.
Due to country restrictions, some commands will be acceptd,but the
value may be limited and replaced by a maximum or minimum value.
ATT Set Tone Dial Default
This command forces DTMF dialing until the next P dial modifier or P command is
received.The modem will set an S-Register bit to indicate that all subsequent dialing
should be conducted in tone mode. Note that the DP command will override this command.
It also clears S14 bit 5. This command may not be permitted in some countries.
ATVn Result Code Form
This command selects the sending of short-form or long-form result
codes to the DTE. The parameter, if valid, is written to S14 bit 3.
ATV0 Enables short-form(terse)result codes. Line feed is not issued before a short-form
result code.
ATV1 Enables long-form (verbose) result codes.(Default)
ATWn Connect Message Control
This command controls the format of CONNECT messages. The parameter value, if valid,
is written to S31 bits 2 and 3. Note that the Wn command can be overridden by register
S95 bits(see S95 description).
ATW0 Upon connection, the modem reports only the DTE speed(e.g.,CONNECT 57600).
Subsequent responses are disabled.(Default)
ATW1 Upon connection, the modem reports the line speed, the error correction protocol, and
the DTE speed, respectively. Subsequent responses are disabled.
ATW2 Upon connection,the modem reports the DCE speed(e.g.,CONNECT
28800). Subsequent responses are disabled.
ATXn Extended Result Codes
This command selects which subset of the result messages will be used by the modem to
inform the DTE of the results of commands.
Blind dialing is enabled or disabled by country parameters.If the user wishes to enforce fail
tone detection, a "W" can be placed in the dial string (see D command). Note that the information
below is based upon the default implementation of the X results table. Table 3-1 indicates the
messages which are enabled for each X value.
If the modem is in facsimile mode(+FCLASS=1 or 2), the only message sent to indicate a connection
is CONNECT without a speed indication.
ATX0 Disables monitoring of busy tones unless forced otherwise by
country requirements; send only OK, CONNECT, RING, NO
CARRIER, ERROR, and NO ANSWER result codes. Blind dialing is
enabled/disabled by country parameters. If busy tone detection
is enforced and busy tone is not detected, NO CARRIER will be
reported. If dial tone detection is enforced or selected and
dial tone is not detected, NO CARRIER will be reported
instead of NO DIAL TONE. The vale 000b is written to S22 bits
6, 5, and 4, respectively.
ATX1 Disables monitoring of busy tones unless forced otherwise by
country requirements;send only Ok, CONNECT, RING, NO CARRIER,
ERROR, NO ANSWER, and CONNECT XXXX(XXXX=rate). Blind dialing
enabled/disabled by country parameters. If busy tone detection is enforced and busy
tone is detected, NO CARRIER will be reported instead of BUSY. If dial tone detection
is enforced or selected and dial tone is not detected, NO CARRIER will be reported instead
of NO DIAL TONE. The value 100b is written to S22 bits 6, 5, and 4, respectively.
ATX2 Disables monitoring of busy tones unless forced otherwise
by country requirements;send only OK,CONNECT,RING,NO CARRIER, ERROR,
NO DIALTONE, NO ANSWER, and CONNECT XXXX. If busy tone detection is
enforced and busy tone is detected, NO CARRIER will be reported instead of BUSY.
If dial tone detection is enforced or selected and dial tone is not detected, NO DIAL
TONE will be reported instead of NO CARRIER.The value 101b is written to S22
bits 6, 5, and 4, respectively.
ATX3 Enables monitoring of busy tones;send only OK,CONNECT,RING,
NO CARRIER,ERROR,NO ANSWER,and CONNECT XXXX. Blind dialing is
enabled/disabled by country parameters.If dial tone detection is enforced and dial
tone is not detected. NO CARRIER will be reported. The value 110b is written to
S22 bits 6, 5, and 4, respectively.
ATX4 Enables monitoring of busy tones;send all messages.The value
111b is written to S22 bits 6,5,and 4,respectively.(Default)
ATYn Long Space Disconnect
This command enables/disables the generation and response to long space disconnect.
The parameter value,if valid,is written to S21 bit 7.
ATY0 Disables long space disconnect.(default)
ATY1 Enables long space disconnect.In non-error correction mode, the modem will
send a long space of four seconds prior to going on-hock.In error correction mode,
the modem will respond to the receipt of a long space (i.e., a break signal greater
than 1.6 seconds)by going on-hook.
ATZn Soft Reset and Restore Profile
The modem performs a soft reset and restores(recalls)the configuration
profile according to the parameter supplied.If no parameter is specified, zero is assumed.
ATZ0 Soft reset and restore stored profile 0.
ATZ1 Soft reset and restore stored profile 1.
AT&Cn RLSD(DCD) Option
The modem controls the RLSO output in accordance with the parameter
supplied. The parameter value,if valid,is written to S21 bit 5.
AT&C0 RLSD remains ON at all times.
AT&C1 RLSD follows the state of the carrier.(Default.)
AT&Dn DTR Option
This command interprets the ON to OFF transition of the DTR signal
from the DTE in accordance with the parameter supplied. The parameter
value, if valid, is written to S21 bits 3 and 4. Also, see S25.
AT&D0 DTR drop is interpreted according to the current &Qn setting as follows:
&Q0,&Q5,&Q6 DTR is ignored(assumed ON).Allows operation with DTEs which do
not provide DTR.
&Q1,&Q4 DTR drop causes the modem to hang up. Auto-answer
is not affected.
&Q2,&Q3 DTR drop causes the modem to hang up. Auto-answer is inhibited.
AT&D1 DTR drop is interpreted according to the current & Qn setting as follows:
&Q0,&Q1,&Q4,&Q5,&Q6 DTR drop is interpreted by the modem as if the asynchronous
escape sequence had been entered. The modem returns to asynchronous
command state without disconnecting.
&Q2,&Q3 DTR drop causes the modem to hang up.
Auto-answer is inhibited.
AT&D2 DTR drop is interpreted according to the current & Qn setting as follows:
&Q0,&Q1,&Q4,&Q5,&Q6 DTR drop causes the modem to perform a soft reset as if
the Z command were received. The &Y setting determines which profile
is loaded.
&Q2,&Q3 DTR drop causes the modem to hang up.Auto-answer is inhibited.
AT&Fn Restore Factory Configuration (Profile)
The modem loads the factory default configuration (profile).The factory defaults are identified
for each command and in the S-Register descriptions. A configuration profile consists of a
subset of S-Registers.
AT&F0 Restore factory configuration 0.
AT&F1 Restore factory configuration 1.
AT&Gn Select Guard Tone
The modem generates the guard tone selected by this command according
to the parameter supplied (DPSK modulation modes only). The parameter value, if valid,
is written to S23 bits 6 and 7.
AT&G0 Disables guard tone. (Default)
AT&G1 Disables guard tone.
AT&G2 Selects 1800 Hz guard tone.
AT&Kn Flow control
This command defines the DTE/DCE (terminal/model)flow control mechanism.
The parameter value,if valid,is written to S39 bits 0,1,and 2.
AT&K0 Disables flow control.
AT&K3 Enables RTS/CTS flow control.(Default for data modem modes.)
AT&K4 Enables XON/XOFF flow control.
AT&K5 Enables transparent XON/XOFF flow control.
AT&K6 Enables both RTS/CTS and XON/XOFF flow control. (Default for fax
modem modes.)
AT&Mn Asynchronous/Synchronous Mode Selection (External Models Only)
AT&M0 Selects direct asynchronous operation.Note that the command
sequence &M0\N0 selects normal buffered mode,but the command
sequence \N0&M0 selects direct mode. This is because the \N0
command is analogous to the &Q6 command. The value 000b is
written to S27 bits 3,1,and 0, respectively.(See &Q).
AT&M1 Selects synchronous connect mode with async off-line command
mode. The value 001b is written to S27 bits 3,1,and 0,
respectively. (Serial interface operation only.)
AT&M2 Selects synchronous connect mode with async off-line command
mode. Same as &M1 except that &M2 enables DTR dialing of
directory slot 0. The modem will disconnect if DTR is OFF for
more than the period in S25 (in units of hundredths of a
second) the data connection will be synchronous. The value
010b is written to S27 bits 3, 1, and 0, respectively.
(Serial interface operation only.)
AT&M3 Selects synchronous connect mode.This mode allows DTR to act
as a talk/data switch.The call is manually initiated while DTR is inactive. When DTR
becomes active, the handshake proceeds in originate or answer mode according to S 14 bit 7.
The value 010b is written to S27 bits 3, 1, and 0, respectively. (Serial interface operation only.)
AT&Pn Select Pulse Dial Make/Break Ratio
This command determines the make/break ratio used during pulse dialing. The default is
country-dependent. The parameter value, if valid, is written to S28 bits 3 and 4.
AT&P0 Selects 39%-61% make/break ratio at 10 pps.(Default)
AT&P1 Selects 33%-67% make/break ratio at 10 pps.
AT&P2 Selects 39%-61% make/break ratio at 20 pps.
AT&P3 Selects 33%-67% make/break ratio at 20 pps.
AT&Qn Sync/Async mode (external models only)
This command is an extension of the &M command and is used to control
the connection modes permitted. It is used in conjunction with S36 and S48. (Also, see \N)
AT&Q0 Selects direct asynchronous operation. The value 000b iswritten to S27 bits 3, 1,
and 0, respectively. (See &M0)
AT&Q1 Selects synchronous connect mode with async off-line command
mode. The value 001b is written to S27 bits 3,1,and 0, respectively. (See &M1)
AT&Q2 Selects synchronous connect mode with async off-line command
mode and enables DTR dialing of directory 0. The value 010b is written to S27 bits 3,1,
and 0, respectively. (See &M2)
AT&Q3 Selects synchronous connect mode with async off-line command
mode and enables DTR to act as Talk/Data switch. The value 011b is written to S27
bits 3,1 ,and 0, respectively. (See &M3)
AT&Q4 Selects AutoSync operation.The value 100b is written to S27 bits 3, 1, and 0,
respectively AutoSync operation, when used in conjunction with the Hayes Synchronous
Interface (HSI) capability in the DTE, provides synchronous communication capability
from an asynchronous terminal.
Starting AutoSync. Set registers S19,S20,and S26 to the desired values before
selecting AutoSync operation with &Q4.After the CONNECT message is issued,
the modem waits the period message of time specified by S25 before examining
DTR. If DTR is on,the modem enters the synchronous operating state; if DTR is off,
the modem terminates the line connection and returns to the asynchronous command
state.
Stopping AutoSync.AutoSync operation is stopped upon loss of carrier or the
on-to-off transition of DTR. Loss of carrier will cause the modem to return to the asynchronous
command state.An on-to-off transition of DTR will cause the modem to return to the
synchronous command state and either not terminate the line connection (&D1 active)
or terminate the line connection (any other &Dn command active).
AT&Q5 The modem will try to negotiate an error-corrected link. The modem can be
configured using S36 to determine whether a failure will result in the modem
returning on-hook or will result in fallback to an asynchronous connection. The
value 101b is written to S27 bits 3,1,and 0,respectively.(Default)
AT&Q6 Selects asynchronous operation in normal mode (speed buffering). The value 110b
is written to S27 bits 3,1,and 0, respectively.
AT&Rn RTS/CTS Option
This selects how the modem controls CTS. CTS operation is modified if
hardware flow control is selected (see &K command). The parameter
value, if valid, is written to S21 bit 2.
AT&R0 In sync mode. CTS tracks the state of RTS. The RTS-to-CTS delay is defined
by S26. In async mode. CTS acts according toV.25bis handshake.
AT&R1 In sync mode, CTS is always ON (RTS transition are ignored).
In async mode. CTS will only drop if required by flow control.(Default)
AT&Sn DSR Override
AT&S0 DSR will remain ON at all times.(Default)
AT&S1 DSR will become active after answer tone has been detected
and inactive after the carrier has been lost.
AT&Tn Test and Diagnostics
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 (normal or direct mode). To terminate a test in progress,
the escape sequence must be entered first, except for parameters 7 and 8. If S18 is
non-zero, a test will terminate automatically after the time specified by S18 and display
the Ok message.
AT&T0 Terminates test in progress.Clears S16.
AT&T1 Initiates local analog loopback,V.54 Loop 3,Sets S16 bit 0.
If a connection exists when this command is issued, the modem hangs up.
The CONNECT XXXX message is displayed upon the start of the test.
AT&T2 Returns ERROR.
AT&T3 Initiates local digital loopback,V.54 loop 2.Sets S16 bit 2.
If no connection exists,ERROR is returned. Sets S16 bit 4
when the test is in progress.
AT&T4 Enables digital loopback acknowledgment for remote request,
i.e., an RDL request from a remote modem is allowed. Sets S23 bit 0. (Default)
AT&T5 Disables digital loopback acknowledgment for remote request,
i.e.,an RDL request from a remote modem is denied. Clears S23 bit 0.
AT&T6 Requests a remote digital loopback(RDL), V.54 Loop2, without self test.
If no connection exists,ERROR is returned. Sets S16 bit 4 when the test is in
progress. The CONNECT XXXX message is displayed upon the start of the tests.
AT&T7 Requests a remote digital loopback(RDL), V.54 Loop 2, with
self test.(In self test, a test pattern is looped back and checked by the modem.)
If no connection exists, ERROR is returned. When the test is terminated either via expiration
of S18, or via the &T0 or H command, the number of detected errors is reported to
the DTE. Sets S16 bit 5 when the test is in progress.
AT&T8 Initiates local analog loopback, V.54 Loop3, with self test. (In self test, a test
pattern is looped back and checked bythe modem.) If a connection exists, the modem
hangs up before the test is initiated. When the test is terminated either via expiration
of S18, or via the &T0 or H command, the number of detected errors is reported to the DTE. Sets S16 bit
6 when the test is in progress.This command may not be available in some countries
due to PTT restrictions.
AT&V Display Current Configuration and Stored Profile
Reports the current (active) configuration, the stored(user) profiles, and the four stored
telephone numbers. The stored profiles and telephone numbers are not displayed if the
NVERAM is not installed or is not operational as detected by the NVRAM test during reset
processing.
AT&V1 Display Last Connection Statistics
Displays the last connection statistics in the following format (shown with typical results):
TERMINATION REASON.......... LINK DISCONNECT or LOCAL REQUEST
LAST TX data rate........... 33600 BPS
HIGHEST TX data rate........ 33600 BPS
LAST RX data rate........... 28800 BPS
HIGHEST RX data rate........ 28800 BPS
Error correction PROTOCOL... LAPM
Data COMPRESSION............ V42Bis
Line QUALITY................ 030
Highest SPX RX state........ 068
Highest SPX TX state........ 067
AT&Wn Store Current Configuration
AT&W0 Store the current configuration as profile 0.
AT&W1 Store the current configuration as profile 1.
At&Yn Designate a Default Reset Profile
Selects which user profile will be used after a hardware reset.
AT&Y0 The modem will use profile 0.
AT&Y1 The modem will use profile 1.
AT&Zn Store Telephone Numbers
The modem can store up to four telephone numbers and each telephone number dial string
can contain up to 34 digits.
AT&Zn=x n=0 to 3 and x=dial string. (Require 256-byte NVRAM.)
AT%En Enable/Disable Line Quality Monitor And Auto-Retrain or Fallback/Fall Forward
Controls whether or not the modem will automatically monitor the line quality and request
a retrain (%E1) or fall back when line quality is insufficient or fall forward when line quality
is sufficient (%E2). Applies to dial-up line only. The parameter value, if valid, is written to
S41 bits 2 and 6. If enabled,the modem attempts to retrain for a maximum of 30 seconds.
AT%E0 Disable line quality monitor and auto-retrain. AT%E1 Enable line quality monitor
and auto-retrain. AT%E2 Enable line quality monitor and fallback/fall forward.(Default)
AT%L Line signal Level
Returns a value which indicates the received signal level.The value
returned is a direct indication (DAA dependent) of the receive level
at the MDP, not at the telephone line connector.
For example, 009=-9dBm, 043=-43 dBm, and so on.
AT%7 Plug and Play Serial Number
AT%7<8 hex numbers><same 8 hex numbers><cr> - Sets Plug and Play Serial Number
Sets and stores eight serial numbers in hex format used for serial Plug and Play and for
ISA Plug and Play which use the Rockwell 11575 Plug and Play device.
Example:
AT%7<8 hex numbers><same 8 hex numbers>
AT%8 Plug and Play Vendor ID and Product Number
Sets and stores Vendor ID and product number for serial Plug and Play and for ISA Plug and
Play which use the Rockwell 11575 Plug and Play device.
Example:
AT%8<3 ASCII characters><4 hex numbers><same 3 ASCII characters><same 4 hex numbers><cr>
AT%Q Line Signal Quality
Reports the line signal quality (DAA dependent). Returns the higher order byte of the
EQM value. Based on the EQM value, retrain or fallback/fall forward may be initiated
if enabled by %E1 or % E2.
AT\Gn Modem-to-Modem Flow Control (XON/OFF)
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. The
parameter value, if valid, is written to S41 bit 3. In error correction mode, the setting of
modem-to-modem XON/XOFF flow control is ignored.however,the serial port flow control
settings(AT&K) remain active during a reliable link. Due to the buffering system used in
the modem, modem-to-modem flow control is normally disabled.
AT&\G0 Disables modem-to-modem XON/XOFF flow control.(Default)
AT&\G1 Enables modem-to-modem XON/XOFF flow control.
AT\Kn Break Control
Controls the response of the modem to a break received from the DTE or the remote
modem or the \B command according to the parameter supplied. The parameter value,
if valid, is written to S40 bits 3, 4, and 5. The response is different in three separate states.
The first state is where the modem receives a break from the DTE when the modem is
operation in data transfer mode:
AT\K0 Enter on-line command mode,no break sent to the remote modem.
AT\K1 Clear data buffers and send break to remote modem.
AT\K2 Same as \K0.
AT\k3 Send break to remote modem immediately.
AT\K4 Same as \K0.
AT\K5 Send break to remote modem in sequence with transmitted data. (Default)
The second case is where the modem is in the on-line command statewaiting for AT commands
during a data connection, and the \B is received in order to send a break to the remote modem:
AT\K0 Clear data buffers and send break to remote modem.
AT\K1 Clear data buffers and send break to remote modem. (Same as \K0)
AT\K2 Send break to remote modem immediately.
AT\K3 Send break to remote modem immediately.(Same as \K2)
AT\K4 Send break to remote modem in sequence with data.
AT\K5 Send break to remote modem in sequence with data .(Same as \K4, Default)
The third case is where a break is received from a remote modem
during a non-error corrected connection:
AT\K0 Clears data buffers and sends break to the DTE.
AT\K1 Clears data buffers and sends break to the DTE.(Same as \K0)
AT\K2 Send a break immediately to DTE.
AT\K3 Send a break immediately to DTE.(Same as \K2)
AT\K4 Send a break in sequence with received data to DTE.
AT\K5 Send a break in sequence with received data to DTE.(Same as \K4, Default)
AT\Nn Operating Mode
This command controls the preferred error correcting mode to be
negotiated in a subsequent data connection.This command is affected
by the OEM firmware configuration.
AT\N0 Selects normal speed buffered mode (disables error-correction mode, Forces &Q6)
AT\N1 Serial interface selected - Selects direct mode and is equivalent to &M0,&Q0 mode
of operation. (Forces &Q0)
Parallel interface selected - Same as \N0.
AT\N2 Selects reliable(error-correction)mode. The modem will first attempt a LAPM
connection and then an MNP connection. Failure to make a reliable connection
results in the modem hanging up. (Forces &Q5, S36=4, and S48=7)
AT\N3 Selects auto reliable mode. This operates the same as \N2 except failure to make
a reliable connection results in the modem falling back to the speed buffered normal
mode. (Forces &Q5, S36=7, and S48=7)
AT\N4 Selects LAPM error-correction mode.Failure to make an LAPM error-correction
connection results in the modem hanging up. (Forces &Q5 and S48=0) Note:The-K1
command can override the \N4 command.
AT\N5 Selects MNP error-correction mode.Failure to make an MNP error-correction
connection results in the modem hanging up. (Forces &Q5, S36=4, and S48=128)
AT\Vn Single Line Connect Message Enable
The single line connect message format can be enabled or disabled by the \Vn command as follows:
AT\V0 Connect messages are controlled by the command settings X, W, and S95.
AT\V1 Connect messages are displayed in the single line format described below
subject to the command settings V (Verbose) and Q (Quiet). In Non-Verbose
mode (V0), single line connect messages are disabled and a single numeric result
code is generated for CONNECT DTE.
When single line connect messages are enabled, there are no CARRIER, PROTOCOL, or
COMPRESSION messages apart from the fields described below.
The single line connect message format is:
CONNECT <DTE Speed></Modulation></Protocol></Compression></Line Speed>/<Voice and Data>
Where:
<DTE Speed = DTE speed, e.g., 57600.
Modulation = "V.32"for V.32 or V.32bis modulations.
“V "V.34"” for V.34 modulations.
Note: Modulation is omitted for all other modulations.
Protocol = "NONE" for no protocol.
“A "ALT" for Microcom Network Protocol.
“L "LAPM" for LAP-M protocol.
Compression = "CLASS5" for Microcom MNP5 compression.
“V "V42BIS" for V.42bis compression.
Note: Compression is omitted if protocol is NONE.
Line Speed = Asymmetric rates are displayed as /rate:TX/rate:RX, e.g., /1200
TX/75 RX.
Symmetric rates are displayed as a single DCE rate, e.g., 14400.
Voice and Data = Blank for Data mode only.
“S "SVD" for AudioSpan analog simultaneous audio/voice and data.
“D "SVD" for G.729A or DigiTalk digital simultaneous voice and data.
AT+MS Commands Select Modulation
This extended-format command selects the modulation and, optionally, enables or disables
automode, specifies the lowest and highest connection rates, selects m-Law or A-Law codec
type, and enables or disables robbed bit signaling generation (server modem) or detection
(client modem) using one to five subparameters.
The command format is:
+MS= <mod> [,[<automode>][,[<min_rate>][,[<max_rate>][,[<x_law>][,[< rb_signaling>]]]]]]<CR>
Notes:
1. For 14400 bps and lower speeds, the Nn command and S37 register can alternatively
be used, in which case the +MS subparameters will modified to reflect the Nn and
S37=x settings. Use of the Nn and S37=x commands is not recommended but is provided
for compatibility with existing communication software. (S37 is not updated by the
AT+MS command.)
2. Subparameters not entered (enter a comma only or <CR> to skip the last subparameter)
remain at their current values.
Reporting Selected Options
The modem can send a string of information to the DTE consisting of selected options
using the following command:
AT+MS?
The response is:
+MS: <mod>,<automode>,<min_rate>,<max_rate>,<x_law>,<rb_signaling>
For example,
AT+MS: 56,1,300,56000,0,0 [RC56 default values]
AT+MS: 11,1,300,33600,0,0 [RC336 default values]
AT+MS: 10,1,300,14400,0,0 [RC144 default values]
Reporting Supported Options
The modem can send a string of information to the DTE consisting of supported options
using the following command:
AT+MS=?
The response is:
AT+MS: (list of supported <mod> values), (list of supported <automode> values),
(list of supported <min_rate> values),(list of supported <max_rate> values),
(list of supported <x_law> values), (list of supported <rb_signaling> values)
For example,
AT+MS: (0,1,2,3,9,10,11,56, 64,69),(0,1),(300-33600),(300-56000),(0,1),(0,1) [RC56]
AT+MS: (0,1,2,3,9,10,11,64,69),(0,1),(300-33600),(300-33600),(0,1),(0,1) [RC336]
AT+MS: (0,1,2,3,9,10,64,69),(0,1),(300-14400),(300-14400),(0,1),(0,1) [RC144]
Subparameter Definitions
1. <mod> = A decimal number which specifies the preferred modulation
(automode enabled) or the modulation (automode disabled) to use in originating
or answering a connection. The options are:
<mod> Modulation Possible Rates (bps) 1 Notes
0 V.21 300
1 V.22 1200
2 V.22 bis 2400 or 1200
3 V.23 1200 See Note 2
9 V.32 9600 or 4800
10 V.32 bis 14400, 12000, 9600, 7200, or 4800 Default for RC144
11 V.34 33600, 31200, 28800, 26400, 24000,
21600,19200, 16800, 14400, 12000,
9600, 7200, 4800, or 2400 Default for RC56/RC336/RC288
[RC56/RC336/RC288 only]
56 K56flex 56000, 54000, 52000, 50000, 48000, [R56 only]
46000,44000, 42000, 40000, 38000,
36000, 34000, 32000
64 Bell103 300
69 Bell 212 1200
Notes:
1. See optional <automode>, <min_rate>, and <max_rate> subparameters.
2. For V.23, originating modes transmit at 75 bps and receive at 1200 bps;
answering modes transmit at 1200 bps and receive at 75 bps. The rate is always
specified as 1200 bps.
The modem may also automatically switch to another modulation (automode), subject to
the following constraints:
a. The modem may not be able to automatically switch from the current modulation
(specified by <mod>) to some other modulation. For example, there is no standard
way to automode from Bell 103 to V.23.
b. The DTE may disable automode operation (see <automode> below).
c. The DTE may constrain the range of modulations available by specifying the lowest
and highest rates (see<min_rate> and <max_rate> below).
2. <automode> is an optional numeric value which enables or disables automatic
modulation negotiation using V.8 bis/V.8 or V.32 bis Annex A. The options are:
<automode> Option Selected Notes
0 Automode disabled
1 Automode enabled using V.8 bis/V.8 or V.32 Annex A Default
The default value is 1, which enables automode. Note, however, there are modulations
for which there is no automatic negotiation, e.g., Bell 212 (<mod> = 69).
For <automode> = 0 (automode disabled, i.e., fixed modulation):
a. If <max_rate> is within the rates supported by the selected modulation, the selected
rate is that specified by<max_rate>. For example:
AT+MS=10,0,1200,4800 selects V.32 bis 4800 bps fixed rate.
b. If <max_rate> is greater than the highest speed supported by the modulation
specified by <mod>, the starting rate is the highest rate supported by the selected
modulation. For example:
AT+MS=10,0,2400,14400 selects V.32 bis 14400, 12000, 9600, 7200, or 4800 bps.
c. To emulate issuance of the N0S37=x command sequence to select fixed mode
operation, specify the <max_rate> and <min_rate> both to be the (same) requested
speed, and <mod> to be the modulation for that speed. For example:
AT+MS=11,0,16800,16800 selects V.34 16800 bps fixed mode (no comparable S37
command).
AT+MS=10,0,12000,12000 selects V.32 bis 12000 bps fixed mode (same as
N0S37=10).
For <automode> = 1 (automode enabled, i.e., automatically selected speed and modulation):
The modem connects at the highest possible rate in accordance with V.8 bis/V.8, or
V.32 bis Annex A if V.8 bis/V.8 is not supported by the remote modem.
a. If <max_rate> is greater than the highest rate supported by the modulation specified
by <mod>, the modem automodes down from the highest rate of the selected
modulation. For example:
AT+MS=10,1,1200,24000 selects automoding down from V.32 bis 14400 bps.
b. To emulate issuance of the N1S37=x sequence command, specify the modulation
and the rate to start automoding down from using <mod> and <max_rate>,
respectively. Set <min_rate> to 300 to allow automoding all the way down to
V.21 300 bps. For example:
AT+MS=11,1,300,16800 selects automode starting at V.34 16800 bps (no comparable
S37 command).
AT+MS=9,1,300,12000 selects automode starting at V.32 bis 12000 bps (same as
N1S37=10).
3. <min_rate> 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 bps. The default is 300 for 300 bps.
4. <max_rate> 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 highest rate to be 14400 bps. The default is 28800 for
28800 bps.
5. <x_law> is an optional number which specifies the codec type. The options are:
0 = m-Law
1 = A-Law
Note that ATZ will reset the <x_law> selection to 0 (m-Law).
6. <rb_signaling> is an optional number which enables or disables robbed bit signaling
generation in a server modem or enables or disables robbed bit signaling detection in
a client modem. The options are:
0 = Robbed bit signaling generation (server modem ) or detection (client modem) disabled (default)
1 = Robbed bit signaling generation (server modem ) or detection (client modem) enabled
Note that ATZ will reset the <rb_signaling> selection to 0 (disabled).
AT+Hn Enable/Disable RPI and DTE Speed
This command enables or disables Rockwell Protocol Interface (RPI) processing and
sets the DTE speed. (Applicable only to modems supporting RPI and RPI+). +H0 Disable
protocol interface and video ready mode.
AT+H1 Enable RPI mode and set DTE speed to 19200 bps.
AT+H2 Enable RPI mode and set DTE speed to 38400 bps.
AT+H3 Enable RPI mode and set DTE speed to 57600 bps.
AT+H11 Enable RPI+ mode (applicable only to modems supporting RPI). When in
RPI+ mode, a link is established between the modem and the WinRPI or WinRPI95 host
PC software driver to allow the modem to support protocol (V.42bis/LAP-M/MNP2-5)
connections with a remote modem. This command should only be used when the
WinRPI or WinRPI95 driver software is installed in the PC.
AT+H16 Enable video ready mode
2. ECC Command Set
COMMAND DESCRIPTION
AT%Cn Enable/Disable Data Compression
Enables or disables data compression negotiation.The modem can only perform data
decompression on an error corrected link. The parameter value, if valid, is written to
S41 bits 0 and 1.
AT%C0 Disables data decompression.Resets S46 bit 1.
AT%C1 Enables MNP 5 data compression negotiation.Resets S46 bit 1.
AT%C2 Enables V.42 bis data compression.Sets S46 bit 1.
AT%C3 Enables both V.42 bis and MNp 5 data compression.Sets S46
bit1.(Default)
AT\An Select Maximum MNP Block Size
The modem will operate an MNP error corrected link using a maximum block size
controlled by the parameter supplied. The parameter value, if valid, is written to S40
bits 6 and 7.
AT\A0 64 characters.
AT\A1 128 characters.(Default.)
AT\A2 192 characters.
AT\A3 256 characters.
AT\Bn Transmit Break to Remote
In non-error correction mode, the modem will transmit a break signal to the remote
modem with a length in multiples of 100ms according to parameter specified. If a
number in excess of 9 is entered, 9 is used. The command works in conjunction with
the \K command. In error correction mode,the modem will signal a break through the
active error correction protocol,giving no indication of the length.
AT\B1-\B9 Break length in 100 ms units.(Default=3, Non-error
correction mode only.)
2.1 MNP 10 Command Set
COMMAND DESCRIPTION
AT)Mn Automatic Level Adjustment Controls
This command is included only for compatibility and performs no function.
AT)M0 AT)M0 command.
AT)M1 AT)M1 command.
AT)M2 AT)M2 command.
AT*Hn Link Negotiation Speed
This command is included only for compatibility and performs no function.
*H0 *H0 command.
*H1 *H1 command.
*H2 *H2 command.
AT-Kn MNP Extend Services
Enables or disables conversion of a V.42 LAPM connection to an MNP 10 connection.
The parameter value, if valid, is written to S40 bits 0 and 1.
AT-K0 Disables V.42 LAPM to MNP 10 conversion. (Default.)
AT-K1 Enables V.42 LAPM to MNP 10 conversion.
AT-K2 Enables V.42 LAPM to MNP 10 conversion; inhibits MNP Extended Services initiation during V.42
LAPM answer mode detection phase.
AT-Qn Enable Fallback to V.22bis/V.22
This command is included only for compatibility and performs no function.
AT-Q0 AT-Q0 command.
AT-Q1 AT-Q1 command.
AT@Mn Initial Cellular Power Level Setting
This command is included only for compatibility and performs no function.
@M0 @M0 command.
.
.
.
@M30 @M30 command.
AT-SEC=n Enable/Disable MNP10-EC
Enables or disables MNP10-EC operation. The command format is:
AT-SEC=n, [<tx level>] where <tx level> is the optional transmit level sub parameter.
AT-SEC=0 Disable MNP10-EC; the transmit level is that defined in S91.
AT-SEC=1, [<tx level>] Enable MNP10-EC; the transmit level will be defined by the
sub parameter <tx level> range 0 to 30 (0 dBm to -30 dBm), the default
<tx level> (<tx level> not specified) is the S91 value.
AT:En Enable Compromise Equalizer
This command is included only for compatibility and performs no function.
AT:E0 AT:E0 command.
AT:E1 AT:E1 command.
3. List Of Class 1 Fax Commands
COMMAND DESCRIPTION
AT+FCLASS=n Select Service Class
AT+F<command>? Report Active Configuration
AT+F<command>=? Report Operating Capabilities
AT+FAE=? 0 if autoansweris disabled; 1 if auto answer is enabled
AT+FRH=n Receive Data with HDLC Framing
AT+FRM=n Receive Data
AT+FFRMn Receive silence
AT+FTH=n Transmit Data with HDLC Framing
AT+FTM=n Transmit data
AT+FTS=n Stop Transmission and Wait
4. List Of Class 2 Fax Commands
COMMAND DESCRIPTION
AT+FCLASS=n Select Service Class. Same as class 1.
AT+FDT Data Transmission
AT+FET=n Transmit Page Punctuation
AT+FDR Begin or Continue Phase C Receive Data
AT+FK Session termination
AT+FCON Facsimile connection response
AT+FDCS: Report current session
AT+FDIS: Report remote identification
AT+FCFR: Indicate confirmation to receive
AT+FTSI: Report the transmit station ID
AT+FCSI: Report the called station ID
AT+FPTS: Page transfer status
AT+FET: Post page message response
AT+FHNG: Call termination status
AT+FMFR? Request Manufacturer Identification
AT+FMDL? Identify Product Model
AT+FREV? Identify Product Revision
AT+FDCC= DCE Capabilities Parameters
AT+FDIS Current Sessions Capabilities Parameters
AT+FDCS Current Session Results Parameters
AT+FLID= Local ID String
AT+FCR Capability to Receive
AT+FPTS= Page Transfer Status
AT+FCQ Copy Quality Checking
AT+FAE Adaptive answer
AT+FBUF? Buffer Size
AT+FPHCTO DTE¡@Phase C Response Time-out
AT+FAXERR T.30 Session Error Report
AT+FBOR Data Bit Order
5. List Of Voice Commands (Voice Models Only)
COMMAND DESCRIPTION
AT#BDR Select Baud Rate(Turn off Autobaud)
This command forces the modem to select a specific DTE/modem baud rate without
further speed sensing on the interface. When a valid #BDR=n command is entered, the
OK result code is sent at the current assumed speed. After the OK has been sent, the
modem switches to the speed indicated by the #BDR=n command it has just received.
When in "Online Voice Command Mode" and the #BDR setting is nonzero (no
autobaud selected), the modem supports a full duplex DTE interface. This means that the
DTE can enter commands at any time, even if the modem is in the process of sending a
shielded code indicating DTMF detection to the DTE.When in Online Voice Command
Mode and the #BDR setting is zero (autobaud selected), shielded code reporting to the
DTE is disabled. [Note that when #BDR has been set nonzero, the modem employs the
S30 Deadman Timer, and this timer starts at the point where #BDR is set nonzero. If this
period expires (nominally 60 seconds) with no activity on the activity on the DTE interface,
the modem reverts to #BDR=0 and #CLS=0)
Parameters: n=0-48 (New baud rate is n*2400bps), default: 0
Result Codes: OK If n=0-48
ERROR Otherwise
Command options:
#BDR? Returns the current setting of the #BDR command as an ASCII decimal value
in result code format.
#BDR=? Returns a message indicating the speeds that are supported.
#BDR=0 Enables autobaud detection on the DTE interface.
#BDR=n Where 1<n<48.Sends OK message at current speed,then switches to the new
speed defined by n*2400 bps unless and until another #BDR=n command is
received. Autobaud is disabled, and the character format is maintained at the
format most recently detected.
AT#CLS Select Data , Fax, or Voice
This command selects Data,Fax,or Voice Mode from operation in any mode.
Parameters: n = 0, 1, 2, or 8;
Default: 0
Result Codes: OK If n=0,1,2, or 8
ERROR Otherwise.
Command options:
#CLS? Returns the current setting(0,1,2, or 8)of the #CLS command as an ASCII
decimal value in result code format.
#CLS=0 Data. This is similar to setting +FCLASS=0,and instructs the modem to act like
a data modem on subsequent answer or originate operations. When a
disconnect or inactivity time out in the non-autobaud mode is detected, the
modem automatically sets the #CLS setting to 0 and hangs up. This ensures
that the modem is always in a known state despite disorderly DTE behavior.
#CLS=1 Class 1 fax. This is similar to setting +FCLASS=1, and instructs the modem to
be a Class 1 fax modem. Once this is set, either the +FAA or +FAE command
can be used to force subsequent answers to be Class 1 adaptive answers.
#CLS=2 Class 2 fax. This is similar to setting +FCLASS=2, and instructs the modem to
be a Class 2 fax modem. Once this is set, the +FAA command can be used to
force subsequent answers to be Class 2 adaptive answers.
#CLS=8 Voice Mode. This is the main setting the DTE uses to effect directed or
adaptive answer or originate sequences involving voice modes. All telephone
calls initialized by #CLS=8 result (after answer or successful call progress) in
the modem in Online Voice Command Mode.
#CLS=n 0 Data mode
1 Fax class 1 mode
2 Fax class 2 mode
8 Voice mode
AT#MDL? Identify Model
This command requests the model number or name of the modem.
AT#MFR? Identify Manufacturer
This command requests the modem manufacturer.
AT#REV? Identify Revision
The #FREV? command requests the revision level of the modem. The message format
is the same as the ATI3 message.
AT#VBQ? Query Buffer Size
This query-only command returns the size of the modem's voice transmit and voice
receive buffers in ASCII decimal, followed by the OK result code.
AT#VBS Bits Per Sample (Voice Compression Factor)
This command selects the degree of ADPCM voice compression to be used.
Parameters: n=2, 3, or 4 (Voice compression bits per sample)
Default: 4
Result Codes: OK If n=2,3,or 4
ERROR Otherwise.
Command options:
#VBS? Returns the current setting of the #VBS command as an ASCII decimal value in
result code format.rates are correlated with the #VCI? query command
response which provides the single compression method available.
#VBS=? Returns "2,3,4", which are the ADPCM compression bits/sample rates available.
These bits/sample compression method available.
#VBS=n n=2, Selects 2 bits per sample ADPCM
n=3, Selects 3 bits per sample ADPCM
n=4, Selects 4 bits per sample ADPCM (Default)
AT#VBT Beep Tone Timer
This command defines the time period, in 10ths of a second up to 4 seconds(40) which
is used by the modem as the DTMF or fixed tone duration for generating tones via the
D command while in Online Command Mode.
Parameters: n=0-40 (0-4 seconds), Default: 10 (1 second)
Result Codes: OK If n=0-40
ERROR Otherwise.
Command options:
#VBT? Returns the current setting of the #VBT command as an ASCII decimal value
in result format.
#VBT=? Returns the message, "0-40".
#VBT=0 Disables the tone generation capability.
#VBT=1 to 40 Sets tone duration time.
AT#VCI? Identify Compression Method
This command queries the modem as to its compression method and raw bits-per-sample
capability. <OP0C0>;<D>pairs, separated by<LF0>s, Within each line, the<O>is left
justified, and is separated from the<D> by the semicolon character and operated from the
bits-per- sample string by another semicolon. <F255P245C255>
AT#VLS Voice Line Selection
This action command can be used to select which devices are routed through the modem.
Parameters: n=0,1,2,3,or 4 [This is the device position number(not device
number) as reflected in response to #VLS=?]
Default: 0
Result Codes: OK If n=0,1,2,3,or 4
VCON If device selected does not connect to the
telephone line. (A speaker is such a device, but
a telephone line with speaker ON is not such a
device, and generates OK.)
ERROR If n does not equal 0,1,2,3,or 4,or if already off-hook.
Command options:
#VLS? This query returns the current setting of the #VLS command as an ASCII
decimal value in result code format.
#VLS=? This query requests a report of the device types available for selection. The
response is a series of numbers separated by commas, and each number
indicates a device position number. Currently, device position numbers do
happen to correspond to device type numbers as 0,1,2,3,or 4, but this
correlation is not required (i.e.,0's could be placed in the first few device
position number locations to correspond to multiple telephone line connections.)
#VLS=n where n=0 telephone line with telephone set (Default)
1 transmit/receive device (handset)
2 transmit only device (on-board speaker)
3 receive only (microphone)
4 telephone line with speaker on and handset
#VLS=0 The default option on the modem. This command instructs the modem that
when entering any of the three voice operating submodes (Online Command,
Transmit, or Receive), that the telephone line interface should be routed
through the modem. The OK response is sent to the DTE, and any previous
connection is lost(i.e.,the modem ends up on-hook as a result of issuing this
command to connect to the telephone line).
#VLS=1 This command instructs the modem to route only the handset through the
modem. This setting can be chosen before recording a greeting message.
#VLS=2 This command instructs the modem to route only the speaker through the
modem. This setting can Command Mode, and the VCON response is generated
for completeness. However, since this is an output only device, nothing of
consequence can happen until the DTE sends the #VTX command.
#VLS=3 This command instructs the modem that only the auxiliary input device
(microphone) should be routed through the modem. This setting can be
chosen before recording a greeting message.
#VLS=4 This command is the same as #VLS=0,except that the modem enables the
internal speaker as well as the telephone line/handset circuit.
AT#VRA Ringback Goes Away Timer(Originate)
This command can be used, when originating a voice call(#CLS=8)to set the "Ringback
Goes Away" timer value,i.e.,an amount of time (in units of 100ms) measured from when
the ringback cadence stops once detected. If ringback is not detected within this period,
the modem assumes that the remote has picked up the line and switches to Online Voice
Command Mode. Every time a ringback cycle is detected, this timer is reset.
Parameters: n=0-255 (0-25.5 seconds); Default: 70 (7,000ms)
Result Code: OK If n=0-255
ERROR Otherwise.
Command options:
#VRA? Returns the current setting of the #VRA command as an ASCII decimal value
in result code format.
#VRA=? Returns the message,"0-255".
#VRA=0 Turns off the "ringback goes away timer."After one ringback, the dialing
modem sends VCON and enters Online Voice Command Mode immediately.
#VRA=n Where n defines the period without ringback(after at least one ringback has
been detected)in 100 ms units.
AT#VRN Ringback Never Came Timer(Originate)
This command can be used when originating a voice call(#CLS=8)to set the "Ringback
Never Came" timer value, i.e., an amount of time (in units of 100 ms) measured from
completion of dialing. If ringback is not detected within this period, the modem assumes
the remote has picked up the line and switches to Online Voice Command Mode.
Parameters: n=0-255 (0-25.5 seconds); Default: 100 (10,000ms)
Result Code: OK If n=0-255.
ERROR Otherwise.
Command options:
#VRN? Returns the current setting of the #VRN command as an ASCII decimal value
in result code format.
#VRN=? Returns the message,"0-255".
#VRN=0 Turns off the "righback never came timer". After dialing, the modem sends
VCON and immediately enters Online Voice Command Mode.
#VRN=n Where n defines the period without ringback after dialing in 100 ms units.
AT#VRX Voice Receive
This actin command is only valid if the modem is in the Online Voice Command Mode
(indicated previously with the VCON message), and is the switch to the Voice Receive
Mode. This command is used when a voice file is to be received from the line,
microphone, or handset. The #VLS command should have been previously issued to
select the input source.
Parameters: None
Result Codes:
CONNECT When voice transfer from modem to DTE can begin.
ERROR If #VLS=0 and not connected to any input device.
AT#VSD Enable Silence Detection (Voice Receive)
This command is used to enable or disable Voice Receive Mode silence deletion.
Parameters: n=0 or 1; Default: 0 or 1
Result Code: OK If n=1
ERROR Otherwise
Command options:
#VSD? Returns the current setting of the #VSD command as an ASCII decimal value
in result code format.
#VSD=? Returns the message ,"1".
#VSD=0 Turns off the silence deletion.
#VSD=1 Turns on the silence deletion if the silence sensitivity setting #VSS is nonzero.
The aggressiveness of the silence deletion is controlled by #VSS.
AT#VSK Buffer Skid Setting
This command queries and sets the number of bytes of spare space, after the XOFF
threshold is reached, in the modem's buffer duringVoice Transmit Mode. This equates
to the "skid" spare buffer space, or the amount of data the DTE can continue to send
after being told to stop sending data by the modem, before the modem voice transmit
buffer overflows.
Parameter: n=255 (Number of bytes of "skid spare buffer space")
Default: 255
Result Code: OK If n=255
ERROR Otherwise
Command options:
#VSK? Returns the current setting of the #VSK command as an ASCII decimal value
in result code format.
#VSK=? Returns the message,"255".
#VSK=n n defines the 255 unused bytes remaining in the modem voice transmit buffer
after an XOFF is sent to the DTE.
AT#VSP Silence Detection Period (Voice Receive)
This command sets the Voice Receive Mode silence detection period (inactivity timer)
value. The parameter, in units of 100ms, can be used when receiving voice data.This is
an amount of time, which if elapsed without receiving any ADPCM data, causes the
modem to send the<DLE>s or <DLE>q codes after insuring that the buffer is empty.
There are two cases:
1. With the modem's silence deletion feature enabled, the #VSP setting is in effect an
inactivity timer. The modem must reset this timer on every byte of voice data received.
2. With the modem's silence deletion feature disabled, the modem determines what
constitutes silence. This involves monitoring and debouncing the modem value for
average energy. If this debounced value is less than an arbitrary threshold
constituting the modem's definition of silence for a period greater than that defined
by the #VSP setting, the modem sends the <DLE>q or <DLE>s shielded code to the
DTE.
Parameters: n=0-255 (0-25.5 seconds); Default: 55 (5.5 seconds)
Result Code: OK If n=0-255.
ERROR Otherwise.
Command options:
#VSP? Returns the current setting of the #VSP command as an ASCII decimal value in
result code format.
#VSP=? Returns the message, "0-255".
#VSP=0 Turns off the silence period detection timer.
#VSP=n Where n defines the period without received voice data in 100 ms units.
AT#VSR Sampling Rate Selection
This parameter, along with the bits per sample (#VBS) command, determines the
necessary DTE interface speed to transmit and receive in the Voice Mode.
Parameter: n=7200 (Fixed at 7200 Hz sampling rate)
Result Codes: OK If n=7200
ERROR Otherwise
Command options:
#VSR? Returns the current setting of the #VSR command as an ASCII decimal value
in result code format.
#VSR=? Returns the message, "7200".
#VSR= 7200 Default.
AT#VSS Silence Detection Tuner (Voice Receive)
This command enables or disables the Voice Receive mode silence detection, and
controls the sensitivity employed by the modem in compressing periods of silence.
Parameters: n=0-3; Default: 2
Result Codes: OK If n=0-3
ERROR Otherwise
Command options:
#VSS? Returns the current setting of the #VSS command as an ASCII decimal value in
result code format.
#VSS=? Returns the message,"0-3".
#VSS=0 Disables silence detection by the modem when in Voice Receive Mode.
#VSS=1 Least sensitive setting. When this command is received by the modem, the
system is configured to a state which is least likely to be the best overall
compromise on normal telephone lines.
#VSS=2 Midrange setting(default). When this command is received by the modem, the
system is configured to a state which is likely to be the best overall compromise on
normal telephone lines.
#VSS=3 Most sensitive setting. When this command is received by the modem, the
system is configured to a state which is most likely to detect and compress periods
of silence.
AT#VTD? DTMF Tone Reporting
This command queries and controls which types of tones can be detected and reported
to the DTE via shield codes in Voice Transmit, Voice Receive, and Online Voice
Command Modes.
Parameters: i,j,k (three ASCII hexadecimal bit maps)
Default: 3F,3F,3F
Result Codes: OK If bits supported with #VTD=? are selected.
Command options:
#VTD? Returns the current setting of the #VTD command as an ASCII decimal
value in result code format.
#VTD=? Returns the tone reporting capabilities of the modem.
#VTD= i,j,k Where i,j,k corresponds (in ASCII hexadecimal) to the desired
capabilities, as shown below, for Voice transmit, Voice Receive, and Online
Voice Command Modes, respectively.
Bit Description
0 0 = Disable DTMF tone capability
1 = Enable DTMF tone capability
1 0 = Disable V.25 1300Hz Calling tone capability
1 = Enable V.25 1300Hz Calling tone capability
2 0 = Disable T.30 1100Hz Facsimile Calling tone capability
1 = Enable T.30 1100Hz Facsimile Calling tone capability
3 0 = Disable V.25/T.30 2100Hz Answer tone capability
1 = Enable V.25/T.30 2100Hz Answer tone capability
4 0 = Disable Bell 2225Hz Answer tone capability
1 = Enable Bell 2225Hz Answer tone capability
5 0 = Disable call progress tone and cadence capability
1 = Enable call progress tone and cadence capability
6-7 Reserved
AT#VTS Generate Tone Signals (Online Voice Command )
This action command can be issued to play one of more DTMF or other
tones (such as a "beep") if and only if the modem is in the Online
Voice Command Mode. The modem parses and plays the tones defined in
the parameter in the order listed, and no key abort is accepted. The
parameter can have three types of elements separated by commas:
Dual or Single Tones: These are represented by a substring enclosed in
square brackets ("[]") with in the parameter.
Each such substring consists of three
sub-elements corresponding to 2 frequencies in
Hz(0,or 200-3000) and a duration (ASCII decimal
in units of 100ms).
Varying DTMF Digits: This is repressented by a substring enclosed in
curly braces("{}") within the parameter. Each
such substring consists of three sub-elements
corresponding to a DTMF digits(0-9,A-D,*,#),and
alternate durations in units of 100ms.
Parameters: The tone generation consists of elements in a list
with each element separated by commas.
Result Codes: OK Command to play tones on currently selected
device is accepted.
ERROR Command was not issued during Online Voice
Command Mode or string is grammatically
incorrect.
AT#VTX Voice Transmit
This action command can be issued if and only if the modem is in the
Online Voice Command Mode (indicated previously with the VCON message)
, and is the switch to Voice Transmit Mode. #VTX is used when a voice
file is to be transmitted to the line, speaker, or handset. The #VLS
command should have been previously issued to select the output source
.
Parameters: None
Result Codes: CONNECT When voice transmission by DTE can begin.
ERROR If #VLS=0 and output device not connected.
5.1 SVD or DSVD Related Command List (SVD or DSVD Models Only)
Command Description
AT-SMS Simultaneous Mode Selection
This command queries the simultaneous voice and data mode. The command
format is: AT-SMS=<mod>,<mini_speed>,<max_speed>,<symbol_rate>
where, <mod>: 0 Data only mode
1 DSVD mode
2 SVD mode
3 Automatic mode select
<mini_speed>: Minimum voice+data speed(bps); Default=2400
<max_speed>: Maximum voice+data speed(bps); Default=28800
<symbol_rate>: Symbol rate for SVD mode (ML288 only)
0 Auto select (Default)
1 2400 bits/symbol
2 2743 bits/symbol
3 2800 bits/symbol
4 3000 bits/symbol
5 3200 bits/symbol
6 3429 bits/symbol
AT#VLS=n Voice Line Selection
where, n= 0 Telephone handset (Default)
5 Headset
6 Speakerphone
AT-SSE=n where, n= 0 Disable DSVD (DSVD only) (Default)
1 Enable
AT-SMC=n (SVD ML144 and V.61 only)
where, n= 0 Disable data burst
1 Enable data burst (Default)
AT-SQS=<SVD_mod>,<auto_mod> Select SVD Modulation (SVD only)
where, <SVD_mod>: 0 V.61
1 ML144
2 ML288
<auto_mod>:0 Disable SVD automatic modulation selection
1 Enable
6. S-Register Descriptions
REG DEFAULT DESCRIPTION
0 0 Ring to auto-answer, 0-255, 0=Disabled
1 0 Ring count, 0-255
2 43 Escape code character, 0-127 ASCII decimal
3 13 Carriage Return character, 0-127 ASCII decimal
4 10 Line Feed character, 0-127 ASCII decimal
5 8 Backspace character, 0-127 ASCII decimal
6 2 Wait time for dial tone, 2-255 seconds
7 50 Carrier wait time, 2-255 seconds
8 2 Pause time for dial delay, 0-255 seconds
9 6 DCD response time, 1-255, with 0.1 seconds in unit
10 14 Disconnection delay, 1-255 with 0.1 seconds in unit
11 95 DTMF duration and spacing, 50-255 with 1 msec in unit
12 50 Escape code guard timer, 0-255 with 20 msec in unit, 0=Disabled
14 1 Bit 1: Command echo, 0=Disabled, 1=Enabled
0 Bit 2: Result codes, 0=Enabled, 1=Disabled
1 Bit 3: Result type, 0=Short form, 1=Long form
0 Bit 5: Dial method, 0=Tone dial, 1=Pulse dial
1 Bit 7: Originate/Answer, 0=Answer mode, 1=Originate mode
16 0 Bit 0: Local Analog Loopback, 0=Disabled, 1=Enabled
0 Bit 2: Local Digital Loopback, 0=Disabled, 1=Enabled
0 Bit 3: Digital Loopback initiated from remote modem indicator,
0=Idle, 1=In progress
0 Bit 4: Initiate Remote Digital Loopback, 0=Disabled, 1=Enabled
0 Bit 5: Remote Loopback with self-test, 0=Disabled, 1=Enabled
0 Bit 6: Local Analog Loopback with self-test,
0=Disabled, 1=Enabled
18 0 Test time, 0-255 seconds
19 0 Bit 1: BSC/HDLC format, 0=BSC, 1=HDLC
0 Bit 2: Address detection, 0=Disabled, 1=Enable
0 Bit 3: NRZI/NZI coding, 0=NRZI, 1=NZI
0 Bit 4: Idle indicator, 0=Mark idle, 1=Flag or sync idle
20 0 AutoSync HDLC address or BSC sync character, 0-255
21 0 Bit 0: Jack type, 0=RJ-11, 41S, 45S, 1=RJ-12, 13
1 Bit 2: CTS behavior, 0=CTS follows RTS, 1=CTS always ON
0 Bit 3, 4: DTR behavior, 0=&D0, 1=&D1, 2=&D2, 3=&D3
0 Bit 5: DCD behavior, 0=&C0, 1=&C1
0 Bit 6: DSR behavior, 0=&S0, 1=&S1
0 Bit 7: Long space disconnect, 0=Y0, 1=Y1
22 1 Bit 0, 1: Speaker volume, 0=Off, 1=Low, 2=Medium, 3=High
1 Bit 2, 3: Speaker control,
0=Disabled
1=On until carrier detected
2=Always on
3=Off while dialing, on until carrier detected
7 Bit 4, 5, 6: Result code option
0=X0 response set
4=X1 response set
5=X2 response set
6=X3 response set
7=X4 response set
23 1 Bit 0: Grant Remote Digital Loopback request,
0= Not allowed
1= RDL allowed
3 Bit 1, 2, 3: DTE rate
0=0 to 300bps
2=1200 bps
3=2400 bps (Default)
4=4800 bps
5=9600 bps
6=19200 bps
7=38400 bps
3 Bit 4, 5: DTE parity, 0=Even, 1=Space, 2=Odd, 3=Mark or None
0 Bit 6, 7: Guard tone, 0=None, 1=None, 2=1800 Hz
24 0 Sleep inactivity timer, 0-255 seconds
25 5 Data Terminal Ready delay, 0-255 with 10 msec in unit
27 0 Bit 6: CCITT/BELL Mode Select (Bn)
0=CCITT Mode (B0; Default)
1=BELL Mode (B1)
28 0 Bit 3, 4: Pulse dialing (&Pn)
0=39/61 ratio at 10 pps (&P0; Default)
1=33/67 ratio at 10 pps (&P1)
2=39/61 ratio at 20 pps (&P2)
3=39/67 ratio at 20 pps (&P3)
0 Bit 6, 7: MNP link speed (*Hn)
0= Highest speed (*H0; Default)
1= 1200bps (*H1)
2= 4800ps (*H2)
29 0 Flash dial modifier time, 0-255 with 10 msec in unit,
0=disabled (Default)
30 0 Disconnect inactivity timer, 0-255 with 10 seconds in unit,
0=disabled (Default)
31 1 Bit 1: Auto line speed detection (Nn)
0=Disabled (N0)
1=Enabled (N1)
0 Bit 2, 3: Error correction progress messages (Wn)
0=DTE Speed Only (W0; Default)
1=Full Reporting (W1)
2=DCE speed only (W2)
32 17 XON Character, 0-255 ASCII decimal
33 19 XOFF Character, 0-255 ASCII decimal
36 7 LAPM Failure Control,
0=Modem hangs up
1=Modem stays on-line, direct mode
2=Reserved
3=Modem stays on-line, normal mode
4=Try V.42 connection. Hang up if fails
5=Try V.42 connection. Direct mode if fails
6=Reserved
7=Try V.42 connection. Normal mode if fails (Default)
37 0 Desired line connection speed,
0=Auto-detect mode (Default)
1-3=300bps
5=V.22 1200bps
6=V.22bis 2400bps
7=V.23
8=V.32bis or V.32 4800bps
9=V.32bis or V.32 9600bps
10=V.32bis 12000bps
11=V.32bis 14400bps
12=V.32bis 7200bps
15=V.FC 14400
16=V.FC 16800
17=V.FC 19200
18=V.FC 21600
19=V.FC 24000
20=V.FC 24600
21=V.FC 28800
38 20 Delay before forced hang up, 0-255 seconds
39 3 Flow control bit mapped optional status
0=No flow control
3=RTS/CTS (&K3, Default)
4=XON/XOFF (&K4)
5=Transparent XON (&K5)
6=Both methods (&K6)
40 Bit 0, 1: MNP extended services (-Kn)
0=Disabled (-K0, Default for non-MNP 10 models)
1=Enabled (-K1, Default for MNP-10 models)
2=Enabled (-K2)
0 Bit 2: Power level adjustment for cellular use (")Mn")
0=Auto adjustment ()M0, Default)
1=Force adjustment()M1)
5 Bit 3, 5: Break handling (\Kn)
0= \K0
1= \K1
2= \K2
3= \K3
4= \K4
5= \K5 (Default)
1 Bit 6, 7: MNP block size (\An)
0= 64 characters (\A0)
1= 128 characters (\A1, Default)
2= 192 characters (\A2)
2= 256 characters (\A3)
41 3 Bit 0, 1: Compression selection (%Cn)
0= Disabled (%C0)
1= MNP 5 (%C1)
2= V.42bis (%C2)
3= MNP 5 and V.42bis (%C3, Default)
0 Bit 2, 6: Auto retrain and fallback/fall forward (%En)
0= Disabled (%E0, Default)
1= Retrain enabled (%E1)
2= Fallback/Fall forward enabled (%E2)
0 Bit 3: Modem-to-modem flow control (\Gn)
0= Disabled (\G0, Default)
1= Enabled (\G1)
0 Bit 4: Block mode control (\Ln)
0= Stream mode (\L0, Default)
1= Block mode (\L1)
1 Bit 7: Enable Fallback to V.22bis/V.22 (-Qn)
0= Disabled (-Q0)
1= Enabled (-Q1, Default)
46 138 Data compression control
S46= 136 Execute error correction protocol w/o compression
S46= 138 Execute error correction protocol w/ compression
48 7 V.42 negotiation action
0= Disable negotiation; bypass the detection and negotiation
phases; and process with LAMP.
7= Enable negotiation (Default)
128= Disable negotiation; bypass the detection and negotiation
phases; and proceed at once with the fallback action
specified in S36. Can be used to force MNP.
82 Break handling option
This register is for compatibility purpose only, changing this
register will not have any affect.
86 Call failure reason code
When the modem issues a NO CARRIER result code, a value is
written to this S-register to help determine the reason for the
failed connection. S86 is the first event that contributes to a
NO CARRIER message. The cause codes are:
0= Normal disconnect, no error occurred
4= Loss of carrier
5= V.42 negotiation failed to detect an error-correction
modem at the other end.
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
91 10 PSTN Transmit attenuation level
Sets the transmit attenuation level from 0 to 15dBm for the PSTN
mode. In some countries, the transmit level may not be changed.
Attenuation level: 0 to 15dBm (0 to -15dBm transmit level)
Default: 10 (-10dBm transmit level)
92 10 FAX Transmit attenuation level
Sets the transmit attenuation level from 0 to 15dBm for the FAX
mode. In some countries, the transmit level may not be changed.
Attenuation level: 0 to 15dBm (0 to -15dBm transmit level)
Default: 10 (-10dBm transmit level)
95 0 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 result code indicates DCE speed instead of DTE
speed
Bit 1 Append /ARQ to CONNECT XXXX result code in error-correction
mode (XXXX = rate)
Bit 2 Enable CARRIER XXXX result code (XXXX = rate)
Bit 3 Enable PROTOCOL XXXX result code (XXXX = protocol
identifier)
Bit 4 Reserved
Bit 5 Enable COMPRESSION result code (XXXX = compression type)
Bit 6 Reserved
Bit 7 Reserved
201 20h Cellular Transmit Level
The bits in this register are set by the @Mn and :En commands
to support cellular connection
Bits 0 - 4 Initial Cellular Power Level Setting (@Mn; Default = @M0)
Bit 5 Compromise Equalizer Enable Command (:En; Default = :E1)
Bit 6 Reserved
Bit 7 Reserved
Download Driver Pack
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Click the Update Driver button, then follow the instructions.
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