Modem operation is controlled by AT commands. These AT commands include the following:
The command syntax and operation guidelines for each command category are described in the following sections. A command line is a string of characters sent from a DTE (Terminal or Data Terminal Equipment) to the DCE while the DCE is in command state. Command lines have a prefix, a body and a terminator. The prefix consists of the ASCII characters AT or at. The body consists of printable ASCII characters. Space characters other than <CR> (See register S3), and <BS> (See register S5) are ignored. <CR> is command terminator. Characters preceding the AT prefix are ignored.
The modem will comply with the commands listed below. Parameters applicable to each command are listed below. Default factory configuration settings are marked by an asterisk *. Features marked with (-) are not yet available in current version.
A/ Re-execute CommandThe modem repeats the last command line sent by the DTE. Usually used for re-dialing.Note: This command should not be terminated by <CR>.
A AnswerThe modem will go off-hook and attempt to answer an incoming call. Upon successful completion of handshake, the modem will go on-line in answer mode.
Notes: If +FCLASS=0 is selected, the modem will enter the connect state after exchanging carrier with the remote system. If no carrier is detected within the period specified in S7, the modem hangs up. Any character entered while connecting will abort the connection process.
If +FCLASS=1, the modem will go off-hook in V21 answer mode. It will generate the V21 2100 Hz answer tone for 3 +/- 0.5 seconds, and following a delay of 70 ms, will proceed as if the +FTH=3 command were issued. At any stage up to (but excluding) the +FTH=3 command state, any character will abort the communication.
If +FCLASS=8 (#CLS=8), the modem will go off-hook and a voice session will take place.
Related S-Reg: S0
Bn CCITT Control
B0 Connect at V.22 1200 bpsResult codes:OK n=0Error Otherwise
Dn DialDirects the modem to go on-line, dial according to the string entered, and attempt to establish a connection. The Dial String may consist of any of the characters described below:
* T Tone dialing (first character in the string)P Pulse dialing (first
character in the string)
L Redial last dialed number (first character in the string)
0-9 Digits 0 to 9.
* Asterisk (tone only)
# Hash (tone only)W Wait for dial tone; the modem will wait for dial
tone before dialing the digits following W. S6 register will be used
for timeout.(X3 or higher)
, (Comma); Pause for the time specified by S8 before resuming the
dialing
; (Semicolon) Return to command mode after dialing. This allows the
user to issue additional AT commands while remaining off-hook. Actual
call progress will be entered only after a dial command issued without
the ; terminator.
S=n Dial the number stored in the directory; n=0-3 (see &Z).
! Flash; The modem will go on hook for a time defined by S24.
@ Wait for silence; The modem will wait for at least 5 seconds of
silence before resuming the dialing. If no such silence is detected
before the expiration of the call abort timer (S7), the modem will
terminate with NO ANSWER response (or BUSY if applicable). If answer
tone arrives during execution of this parameter, the modem handshakes.
(X3 or higher)(),< > (space) String format characters -
ignored<i> any other character - ignored.
Notes:If +FCLASS=0 is selected, the modem will attempt to connect with another data modem. The modem will use the time period specified in S6 and S7 as time-outs in the handshake process. If a timeout expires, the modem will go on-hook and respond with NO CARRIER response. The command will be aborted in progress is a DTE character is entered before completion of the handshake.
If +FCLASS=1, the modem will attempt to connect with a fax machine (or modem) by entering the HDLC V21 channel 2 receive state (as if +FRH=3 had been issued). The command will be aborted upon receipt of a DTE character if the modem has not finished dialing. In this case the modem will go on-hook and return to command mode responding with NO CARRIER message. If the modem has finished dialing, It proceeds as if +FRH=3 command has been issued.
If +FCLASS=8 (#CLS=8), the modem will go off-hook in V21 answer mode. It will decide (based on timers) when the other side answers in voice and a voice session will take place.
Related S-Reg: S5,S6,S7,S16,S22,S28,S56
En * Set local echoThe modem enables/disables echo of characters to DTE.Parameter value is written to S13.
E0 Disable command echo.
E1 Enable command echo.Result codes:
In Identification/Information
I1 Modem Name, Vendor Name, Modem Version.
I2 Provider, Version.
I3 Chipset Vendor/Chipset ID.
I4 Modem active profile for example, Active Profile: S00=000 S01=000 S02=000 S03=000 S04=000 S05=000 S06=000 S07=000 S08=000 S00=009 S10=000 S11=000 S12=000 S13=000 S14=000 S15=000 S16=000 S17=000 S18=000 S01=019 S20=000 S21=000 S22=000 S23=000 S2 4=000 S25=000 S26=000 S27=000 S28=000 S29=000 S30=000 S31=000 S32=000 S33=000 S34=000 S35=000 S36=000 S37=000 S38=000 S39=000 S40=000 S41=000 S42=000 S43=000 S44=000 S45=000 S46=000 S47=000
I5 Stored profile 0 Active Profile 0: (Same format as above)
I6 Stored profile 1 Active Profile 1: (Same format as above)
I7 Display stored pone numbers (See &Z command)
Ln *Speaker volume Select speaker volume.
L0 L
L1 Low
L2 Medium
L3 High Result codes: OK n=0-3 Error Otherwise Related S-Reg: S30
Mn * Speaker control Select when the speaker is On/Off.
M0 Speaker always OFF
M1 Speaker ON from start of dialing until receiving carrier
M2 Speaker always ON
M3 Speaker OFF from end of dialing until receiving carrier Result codes:
Nn *Automode control
N0 Automode detection disabled. A subsequent handshake will be conducted according to the contents of S32.
N1 Automode enabled. A subsequent handshake will be conducted according to the Automode algorithm. Result codes:
On Returns to on-line data mode This command is normally used to connect the DTE back after an escape (+++) has been issued.
O0 Return to on-line data mode.
O1 Return to on-line data mode, retrain first. Result codes:
P Pulse dialing Forces pulse dialing. Applies to subsequent dialing commands. This command holds until the next T dial modifier or T command is received. The modem will go off hook and attempt to answer an incoming call. Upon successful completion of handshake, the modem will go on-line in answer mode.
Related S-Reg: S16
Q* Quiet result codes control
Q0 Enable sending result codes to DTE.
Q1 Disable sending result codes to DTE. Result codes:
S Read/Write S-Register This command has a few derivatives:
Sn=v Sets the value v (decimal) to S-register n (v=0-255)
Sn? Displays the value of S-register in decimal format (3 digits) Note: Some registers are read-only Result codes:
T Tone dialing Forces tone dialing. Applies to subsequent dialing commands. This command holds until the next T dial modifier or T command is received. This command changes S14 to reflect the current dialing mode. Related S-Reg: S16
Vn Verbose/Numeric result codes Select the time of result messages sent to the DTE. For a list of result codes and verbal messages see X command.
V0 Short form (numeric) result codes to be sent to DTE.
V1 Long form (verbose) result codes to be sent to DTE. Result codes:
Related S-Reg: S15
Xn Extended result codes Select the subset of result codes to be used by the modem to the DTE. If the modem is in fax mode (+FCLASS=1), the only message sent to indicate connection is CONNECT without a speed indication.
X0 Supported messages: OK, CONNECT, RING, NO CARRIER and ERROR, Blind call enabled.
X1 Supported messages: OK, CONNECT xxxx, RING, NO CARRIER and ERROR, Blind call enabled.
X2 Same as X1 + NO DIAL TONE message, Blind call disabled
X3 Same as X1 + BUSY message, Blind call enabled.
X4 All messages supported, Blind call disabled (see list below).
Notes:
Result Message X0 X1 X2 X3 X4 Code
0 OK * * * * *
1 CONNECT * * * * *
2 RING * * * * *
3 NO CARRIER * * * * *
4 ERROR * * * * *
5 CONNECT 1200 1 * * * *
6 NO DIAL TONE 3 3 * 3 *
7 BUSY 3 3 3 * *
8 NO ANSWER 3 3 3 * *
9 CONNECT 0300 1 * * * *
10 CONNECT 0600 1 * * * *
11 CONNECT 2400 1 * * * *
12 CONNECT 4800 1 * * * *
13 CONNECT 7200 1 * * * *
27 CONNECT 9600 1 * * * *
14 CONNECT 12000 1 * * * *
15 CONNECT 14400 1 * * * *
16 CONNECT 16800 1 * * * *
17 CONNECT 19200 1 * * * *
18 CONNECT 21600 1 * * * *
19 CONNECT 24000 1 * * * *
20 CONNECT 26400 1 * * * *
21 CONNECT 28800 1 * * * *
22 CONNECT 31200 1 * * * *
23 CONNECT 33600 1 * * * *
24 CONNECT 34800 1 * * * *
25 CONNECT 40000 1 * * * *
26 CONNECT 42000 1 * * * *
28 CONNECT 44000 1 * * * *
29 CONNECT 46000 1 * * * *
30 CONNECT 48000 1 * * * *
31 CONNECT 50000 1 * * * *
32 CONNECT 52000 1 * * * *
33 CONNECT 54000 1 * * * *
34 CONNECT 56000 1 * * * *
35 CONNECT 57600 1 * * * *
36 CONNECT 115200 1 * * * *
37 CONNECT 230400 * * * *
38 CONNECT 460800 1 * * * *
39 CONNECT 921600 1 * * * *
40 CONNECT 32000 * * * *
41 CONNECT 34000 1 * * * *
42 CONNECT 36000 1 * * * *
43 CONNECT 38000 * * * * *
44 CONNECT 58000 * * * * *
45 CONNECT 60000 * * * * *
46 CONNECT 28000 * * * * *
47 CONNECT 29333 * * * * *
48 CONNECT 30666 * * * * *
49 CONNECT 33333 * * * * *
50 CONNECT 34666 * * * * *
51 CONNECT 37333 * * * * *
52 CONNECT 38666 * * * * *
53 CONNECT 41333 * * * * *
54 CONNECT 42666 * * * * *
55 CONNECT 45333 * * * * *
56 CONNECT 46666 * * * * *
57 CONNECT 49333 * * * * *
58 CONNECT 50666 * * * * *
59 CONNECT 53333 * * * * *
60 CONNECT 54666 * * * * *
70 FAX * * * * *
71 DATA * * * * *
100 VCON 4 4 4 4 *
101 DELAYED 4 4 4 * *
102 BLACKLISTED 4 4 4 * *
66 COMPRESSION: - * * * * CLASS 5
67 COMPRESSION: - * * * * V.42BIS
69 COMPRESSION: - * * * * NONE
76 PROTOCOL: NONE - * * * *
77 PROTOCOL: LAPM - * * * *
78 PROTOCOL: MNP - * * * *
1021 MODULATION: V.21 - * * * *
1022 MODULATION: V.22 - * * * *
1032 MODULATION: V.32 - * * * *
1034 MODULATION: V.34 - * * * *
1090 MODULATION: V.90 - * * * *
1092 MODULATION: V.92 - * * * *
1103 MODULATION: B103 - * * * *
1122 MODULATION: - * * * * V.22BIS
1132 MODULATION: - * * * * V.32BIS
1134 MODULATION: - * * * * V.34BIS
1212 MODULATION: B212 - * * * *
+F4 +FCERROR * * * * *
<*> message will be generated when n has
been selected
<i> message will be replaced by message <I> when n has been selected
<-> message will not be generated when n has been selected.
Related S-Reg: S56
Yn * Select default configuration Select the default user defined configuration. Note: The default configuration is not loaded by Yn (SeeZn)
Y0 Select user template 0
Y1 Select user template 1
Y2 Select factory setting 0
Y3 Select factory setting 1 Related S-Reg: S161
Zn Select user defined configuration Select the user defined configuration.
Z0 Select default user template (as defined by Yn)
Z1 Select user template 0
Z2 Select user template 1
Z3 Select factory setting 0 (&F0)
Z4 Select factory setting 1 (&F1) Result codes:
Related S-Reg: S59
- Model And Manufacturer Identification Note: Commands in this section are supported starting from drivers version 2.90 and up.
+GMI Request Manufacturer Identification (similar to ATI3) for example: ModemWorks Ltd.
+GMM Request Model Identification (similar to ATI2) for example: ModemX Ver 2.90.00
+GMR Request Revision Identification for example: SW Vendor Ver 2.90.00 MV (CID)
Note: Commands in this section are supported starting from drivers version 2.90 and up. Indicate or select the country of installation. The modem uses this setting to determine country-specific functions. Note: There are now two alternative ways to set the country for the modem: either through AT+GCI command or using the Modem Settings utility in the Control Panel of the OS.
+GCI=<T.35 country code> Sets current country. Valid country codes are hexadecimal numbers based on ITU-T.35. See below for a list of valid codes. Example - setting the current country to USA: AT+GCI=B5
+GCI? Reports the hexadecimal numeric value corresponding to the current country setting. For example, when modem is set to France the response will be: +GCI:3D
+GCI=? Reports the list of numerical values corresponding to the country or countries that are supported by the modem. Example: +GCI:(20,73,B5) indicates the modem can be set for Canada, Mexico or the USA.
&An * Connect message format Select the format of the CONNECT message.
&A0 no extra messages besides CONNECT xxxxx
&A1 Add Modulation indicator: V.21/ V.22/ V.22BIS/ V.32/ V.32BIS/V.34/ V.34BIS/ B103/ B212 For example: Modulation: V.34
&A2 Add Error Detection Protocol and Data Compression indicators. For example:
&A3 Add Modulation Indicator + Error Detection Protocol + Data Compression indicators (see above).
&A7 Add transmit rate indicator (TXRATE). For example:
&Cn * Control Carrier Detect (CD,RLSD) behavior Controls the RLSD output behavior.
&C0 RLSD is assumed to be ON all the time
&C1 RLSD follows the carrier state Result codes:
&Dn *Controls DTR behavior (NA) Controls the DTR output behavior. Note: This command is supported for compatibility.
&D0 DTR is taken to be ON all the time
&D1 DTR drop causes entry to command mode without disconnect
&D2 DTR follows DTR circuit definition
&D3 DTR drop causes software reset (as in Z0) Result codes:
&En *Connect message speed source Select the requested source for the speed field in the CONNECT message.
&E0 DCE Speed
&E1 DTE Speed Note: Since a virtual port is involved, the DTE is not bound by any UART limitation, and may be theoretically set as high as 921600. DTE speed is supported for compatibility only. Related S-Reg: S71
&Fn Sets factory configuration Select one of the factory settings.
&F0 Select factory setting 0
&F1 Select factory setting 1
&Hn * Sets flow control Select the user defined configuration.
&H0 Flow control disabled (NA)
&H1 HW flow control RTS/CTS (emulation) Result codes:
&Kn Same as %Cn
&Pn *Set pulse dial make/break ratio
&P0 US & Canada 39%/61% (10 pps)
&P1 UK & Hong Kong 33%/67% (10 pps)
&P2 Same as 0, except at 20 pps
&P3 Same as 1, except at 20 pps Result codes:
&Rn Controls RTS behavior Controls the RTS output behavior. Note: This command is supported for compatibility. It has no actual effect
&R0 RTS ignored
&R1 Modem receives data only on RTS (NA) Result codes:
&Sn Controls DSR behavior Note: This command is supported for compatibility. It has no actual effect.
&S0 DSR override (is assumed to be ON all the time)
&S1 DSR follows circuit definition Result codes:
&V Display Active profile, Stored Profiles, Stored Phone Numbers (Equivalent to I4-I7 combined)
&Wn Writes current configuration
&W0 Write to template 0 &W1 Write to template 1 Result codes:
&Zn Stores dial string Stores/Displays dial string (up to 47 characters)
&Zn=s Store dial string (n=0-4)
&Zn=L Store the last dialed string (n=0-4)
&Zn? Display the nth string
&ZL? Display the last dialed string written to registry.
\An * Maximum MNP block Size
\A0 64 characters maximum block size
\A1 128 characters maximum block size
\A2 192 characters maximum block size
\A3 256 characters maximum block size Result codes:
\Bn Transmit break to remote (-) In non-error correction mode, the modem will transmit a break signal to the remote modem with a length of n*100ms. If a number above 9 is entered, 9 is used. Result codes:
\Kn Break Control (-) Controls the response of the modem to a break received from DTE or a remote modem or the \Bn command. The behavior parameter is written to Sxx
\K0 Enter on-line command mode, no break sent to remote modem
\K1 Clear data buffers and send break to remote modem
\K2 Same as 0
\K3 Send break to remote modem immediately
\K4 Same as 0
* \K5 Send a break to remote modem in sequence with transmitted data Related S-Reg: S<basereg+x> of V.42 registers Result codes:
\Nn Error correction operating mode
\N0 Normal (Speed buffering) - No error correction
\N1 Direct (pass-through) 128 characters maximum block size
\N2 Reliable (error correction) mode. The Modem will attempt LAPM and then MNP
* \N3 Auto reliable mode. Same as \N2, but will fall back to Normal
\N4 LAPM error correction mode only, hang up upon failure.
\N5 MNP error correction mode only, hang up upon failure. Result codes:
%Cnb *Compression control
%C0 Disable data compression
%C1 Enable MNP5 data compression
%C2 Enable V.42bis data compression
%C3 Enable MNP5/V.42bis data compression Result codes:
%En *Line quality monitor control Controls whether or not the modem will automatically monitor the line quality and request a retrain (%E1), or fall back when quality is insufficient or fall forward when line quality improves (%E2).
%E0 Disable line quality control
%E1 Enable line quality control and auto retrain
%E2 Enable line quality control and fallback/forward Result codes:
+MS Modulation select This command selects the modulation, optionally enables/disables Automode, and optionally specifies the lowest and highest connection rates. The command format is:
AT+MS=[<mod>][,[<automode>][,[<min_rate>][,[<max_rate>]]]] <mod> a decimal number specifying the preferred modulation (automode enabled), or the modulation (automode disabled). <automode> 0/1 Automode disabled/enabled <min_rate> minimum rate for connection. If lower than the actual minimum rate for the selected modulation, the actual lowest supported rate will be taken. <max_rate> maximum rate for connection. If higher than the actual maximum rate for the selected modulation, the actual highest supported rate will be taken.
Table 2 - +MS command parameters <mod> Modulation possible rates
22 V.22 1200
122 V.22bis 2400,1200
23 V.23 1200
32 V.32 9600, 4800
132 V.32bis 14400, 12000, 9600, 7200, 4800
34 V.34 33600, 31200, 28800, 26400, 24000, 21600, 19200,16800, 14400, 12000, 9600
56 K56Flex 32000, 34000, 36000,56000
90 V.90 29333, 30666, 32000,56000
212 Bell 212 1200
103 Bell 103 300
Examples: AT+MS=34,0,4800,33600 V.34, No Automode, Min. speed 4800, Max speed 33600
AT+MS=,1 Automode
AT+MS=32,1,,14400 V.32 Automode, Max speed 14400 (min speed as before)
Factory Settings: 90,1,300,56000 The requested modulation scheme will be written to S32 The requested min rate will be written to S33 The requested max rate will be written to S34 The actual rate may be read from S35 The actual modulation scheme may be read from S37 (The codes as specified in the Xn command) Other derivatives of the +MS command:
AT+MS? report current MS settings (e.g. 34,1,9600,33600)
AT+MS=? list the supported values +MS:(22,122.....),(0,1), (300-33600), (300-33600) Result codes:
+FCLASS=<value> Sets Data/Fax Class1/Voice (0,1,8) mode.
+FCLASS=<value> [<value> - 0,1,8 (Data/Fax Class1/Voice] Result codes:
+FCLASS? Returns the current setting Related S-Regs: S32, S150
+FAE Data/Fax Auto Answer
+FAE=<value> [<value> - 0,1 (Data/Fax Class1)]
+FAE? Returns the current setting Related S-Regs: S151
+FTS=<value> Stops transmission and waits. Terminates transmission and waits for <value>*10ms interval before responding with OK. ERROR is issued if the modem is on-hook.
+FTS? Returns the current setting
+FRS=<value> Receives Silence. Report back to DTE with OK after <value>*10ms silence interval has been detected. The command is aborted if any character is received from the DTE (The response will still be OK). ERROR is issued if modem is on-hook.
+FRS? Returns the current setting
+FTM=<value> Transmits data according to the defined modulation. ERROR is issued if modem is on-hook.
Value Modulation 24 V.27 ter 2400 bps 48 V.27 ter 4800 bps 72 V.29 7200 bps 73 V.17 7200 bps long 74 V.27 7200 bps short 96 V.29 9600 bps 97 V.17 9600 bps long 98 V.17 9600 bps short 121 V.17 12000 bps long 122 V.17 12000 bps short 145 V.17 14400 bps long 146 V.17 14400 bps short
+FTM=? Return 24, 4, 72, 73, 74, 96, 97, 98, 121,122, 145, 146
+FRM=<value> Receives data according to the defined modulation (See Values above) ERROR is issued if modem is on-hook. +FRM=? Return 24, 48, 72, 73, 74, 96, 97, 98, 121,122, 145, 146 see +FTM
+FRH=<value> Receives data using HDLC protocol and the defined modulation . ERROR is issued if modem is on-hook. <value> - 3 (V.21 channel 2 300 bps)
+FRH=? Return 3
+FTH=<value> Transmits data using HDLC protocol and the defined modulation . ERROR is issued if modem is on-hook. <value> - 3 (V.21 channel 2 300 bps)
+FTH=? Return 3
Note: The following command will always return OK as a result code. *B Return Blacklisted numbers Blacklisting is a country dependent parameter. When no duration is defined: When a number is unsuccessfully called x successive times, it is blocked altogether, until next system reset. Further calls will return BLACKLISTED code. When duration is defined: When a number is unsuccessfully called x successive times, it is blocked temporarily until the time-out expires. Calls within the time-out period will return DELAYED code.
Format: No. Called Blocked Phone Index # of calls (blank) Phone number - not blocked (number still candidate for blacklist) or * (asterisk) - blacklisted/blocked or Xmin - # of min to time-out delayed
Example 1: No time-out defined. Full blocking occurs No. Called Blocked Phone 1 5 * t1234 2 3 t5678
Example 2: Time-out defined. Delay scheme used. No. Called Blocked Phone 1 5 2min t1234 2 3 t5678
Note: All the following commands will return OK as a result code (or ERROR if the parameters are faulty), unless stated otherwise. #BDR=<value> Sets DTE Baud Rate<value> - DTE Baud rate (0-48) *2400
#CID=<value> Enables the Caller ID feature in any mode
#CID=0 - Disable Caller ID
#CID=1 - Enable Caller ID (Verbose)
#CID=2 - Enable Caller ID (Numeric)
#RG=<value> Sets receive gain level (effects the AUDIO IN level) <value> - 0-7fff
#TL=<value> Sets transmit level (effects the AUDIO OUT level) <value> - 0-7fff
#CLS=<value> Same as +FCLASS=<value> Sets Data/Fax Class1/Voice (0,1,8) mode.
#VBS Bits per sample (ADPCM or PCM).
#VBS=<value> [<value> - 4 (ADPCM), 8,16 (PCM)]
#VBS? Returns the current setting
#VBS=? Returns 4,8,16 Related S-Regs: S76
#VBT Sets Beep tone timer for generating tones and DTMF.
#VBT=<value> [<value> - 0-40 (* 1/10 ms)]
#VBT? Returns the current setting
#VBT=? Returns 0-40
#VIP Initializes Voice Parameters
#VIT Sets Inactivity timer.
#VIT=<value> [0-255 (* 1/10 ms)]
#VIT? Returns the current setting
#VIT=? Returns 0-255 Related S-Regs: S19
#VLS Voice Source selection.
#VLS=<value>
0 - Telephone Line Select (Go on hook) 2 - Speakers 3 - Microphone 4 - Telephone Line Select + Samples routed to/from Speakers/Mic in TX/RX modes 6 - Speakerphone
#VLS? Returns the current setting
#VLS=? Returns "0,2,3,4,6" Result codes:
#VRA Ringback Goes Away Timer (originate). This value is used during call progress to detect a voice answer. This is the interval between ringback ending and voice answer determined.
#VRA=<value> [0-255 (*1/10 MS)]
#VRA? Returns the current setting
#VRA=? Returns 0-255
#VRN Ringback Never Came Timer (originate) This value is used during call progress to detect a voice answer. This is the interval without detection of ringback before voice answer is determined.
#VRN=<value> [0-255 (*1/10 MS)]
#VRN? Returns the current setting
#VRN=? Returns 0-255
#VRX Go to Voice Receive Mode. Result codes:
#VSD Enables/Disables silence deletion (voice receive,ADPCM) (-)
#VSD=<value> [0,1 - Disable/Enable]
#VSD? Returns the current setting
#VSD=? Returns 0,1
#VSP Sets Silence Period (voice receive, ADPCM)
#VSP=<value> [0-255 (*1/10 ms)]
#VSP? Returns the current setting
#VSP=? Returns 0,255
#VSR Sets Sample Rate (PCM, ADPCM)
#VSR=<value> [7200, 11025, 8000]
#VSR? Returns the current setting
#VSR=? Returns 7200, 11025, 8000 Only 7200 is currently supported
#VSS Sets Silence Sensitivity (voice receive, ADPCM) (-)
#VSS=<value> [0-3] (0-Disable, 3-allow noisy conditions
#VSS? Returns the current setting
#VSS=? Returns 0-3
#VTD Sets DTMF reporting capabilities in Voice Transmit, Receive, and Voice Online Command Modes.
#VTD=<value><value><value> [0-3F]
#VTD? Returns the current setting
#VTD=? Returns <0-3F>,<0-3F>,<0-3F>
Bit Settings Bit Description 0 Disable/Enable DTMF detection 1 Disable/Enable V.25 1300 Hz detection 2 Disable/Enable T.30 1100 Hz detection (Fax) 3 Disable/Enable V.25/T.30 2100 Hz detection (Modem) 4 Disable/Enable Bell 2225 Hz detection 5 Disable/Enable Busy/Dial tone detection 6-7 reserved
#VTM Enables timing mark placement.
#VTM=<value> [0-10 (* 1/10 ms)]
#VTM? Returns the current setting
#VTM=? Returns 0-10
#VTS Generates a tone signal.
#VTS= [x,y,z] | {x,z} | x, ...[x,y,z]
x represents the first frequency (Hz) y represents second frequency (Hz) z represents the duration (in 100 ms units){x,z} DTMF Digits with Variable Duration. x represents the DTMF digit (0-9,A-D,*,#) z represents the duration (in 100 ms units) DTMF Digits, with duration defined by #VBT. This is represented by a value x (non-bracketed) corresponding to a DTMF digit (0-9,A-D,*,#, !). Note: ! stands for flash.
#VGT Sets Playback Volume [Default 192]
#VGT=<value> [0-255 (*1/10 ms)]
#VGT? Returns the current setting
#VGT=? Returns 0-255
#VTX Go to Voice Receive Mode Result codes:
#SPK Sets Speakerphone parameters
#SPK=<mute>,<speaker>,<mic> <mute> 0 Microphone Mute
* 1 Microphone On (default) 2 Room Monitor (mic on Max, Speaker off) <speaker> 0-15 - 2-30 dB attenuation * 5 - (Default) 16 - speaker mute <mic> 0 - 0 dB gain * 1 - 6 dB gain (Default) 2 - 9 dB gain 3 - 12 dB gain
Note: Speakerphone function may not be supported by some models.
#UD Returns diagnostics data
Description
#UD is an action command. It does not take parameters. It shall be the last command in the command line. In response to this command, the modem report one or more lines of information text as defined below, and terminated by <CR><LF>. Each information text line is formatted as follows, including one or more key=value pairs: DIAG <token key=value [[key=value] [key=value]] >Character description DIAG 5 characters, hex: 44, 49, 41, 47, 20 < left angle bracket (less than sign), hex: 3C Token unique 32-bit hexadecimal string 2A4D3263 Space space character, hex 20 Key One or two digit hexadecimal number, see Table 1= equal sign, hex: 3D Value any string as defined below (Tables 1-3, etc.) > right angle bracket (greater than sign), hex: 3E
Key value(s) Definition
0 2 digits Diagnostic Command Specification revision number, digit.digit
1 Table 2 Call Setup Result code
2 Table 3 Multi-media mode
3 Table 4 DTE-DCE interfmode
4 String V.8 CM octet string, same format as V.25ter Annex A, in quotes
5 String V.8 JM octet string, same format as V.25ter Annex A, in quotes
6-F Reserved for call negotiation reports
10 0-2F Received signal power level, in dBm (0-43)
11 0-1F Transmit signal power level, in dBm (e.g. 0-17)
12 0-64 Estimated noise level, in dBm (e.g. 10-90)
13 0-FF Normalized Mean Squared error, 100 (0x64) = min inter-symbol distance
14 0-3F Near echo loss, in units of dB (Note 4)
15 0-3F Far echo loss, in units of dB (Note 4)
16 0-3F Far echo delay, in units of ms (Note 4)
17 0-FFF Round Trip delay, in units of ms (Note 4)
18 Table 5 V.34 INFO bit map (Note 4)
19-1F Reserved for modulation setup and training reports (Note 5)
20 Table 6 Transmit Carrier Negotiation Result (Note 6)
21 Table 6 Receive Carrier Negotiation Result (Note 6)
22 0-1F40 Transmit Carrier symbol rate (0-8000) in symbol/s
23 0-1F40 Receive Carrier symbol rate (0-8000) in symbol/s
24 0-FA0 Transmit Carrier frequency (0-4000) in Hz (Note 7)
25 0-FA0 Receive Carrier frequency (0-4000) in Hz (Note 7)
26 0-FA00 Initial transmit carrier data rate (0-64000) in bit/s
27 0-FA00 Initial receive carrier data rate (0-64000) in bit/s
28-2F reserved
30 0-FF Temporary carrier loss event count
31 0-FF Carrier Rate re-negotiation event count
32 0-FF Carrier Retrains requested
33 0-FF Carrier Retrain requests granted
34 0-FA00 Final transmit carrier data rate in bit/s
35 0-FA00 Final receive carrier data rate in bit/s
36-3F reserved
40 Table 7 Protocol Negotiation Result (Note 8)
41 0-400 Error Control frame size in bytes
42 0-FF Error control link timeouts in transmission
43 0-FF Error control link NAKs received
44 Table 8 Compression Negotiation Result
45 0-800 Compression dictionary size in bytes
46-4F reserved
50 0-2 Transmit flow control: 0 = off; 1 = DC1/DC3; 2 = V.24 ckt 106/133
51 0-2 Receive flow control: 0 = off; 1 = DC1/DC3; 2 = V.24 ckt 106/133
52 0-FFFFFFFF Transmit characters sent from DTE (Note 8)
53 0-FFFFFFFF Received characters sent to DTE (Note 8)
54 0-FFFF Transmit characters lost (data overrun errors from DTE) (Note 9)
55 0-FFFF Received characters lost (data overrun errors to DTE) (Note 9)
56 0-FFFFFFFF Transmit I- Frame count, if error control protocol running (Note 8)
57 0-FFFFFFFF Received I-Frame count, if error control protocol running (Note 8)
58 0-FFFF Transmit I-Frame error count, if error control protocol running (Note 9)
59 0-FFFF Received I- Frame error count, if error control protocol running (Note 9)
5A-5F Reserved
60 Table 9 Termination Cause
61 0-FF Call Waiting event count
62-7F Reserved for future versions of this specification
80-FF Reserved for manufacturer proprietary keys
Code Definition
0 No previous call (modem log has been cleared since any previous calls)
1 No dial tone detected
2 Reorder signal detected, network busy
3 Busy signal detected
4 No recognized signal detected (e.g. no signal, or nothing recognizable)
5 Voice detected * if this is a voice modem operating in voice mode (e.g.+FCLASS=8.0)
6 Text telephone signal detected (see V.18)
7 Data Answering signal detected (e.g. V.25 ANS, V.8 ANSam)
8 Data Calling signal detected (e.g. V.25 CT, V.8 CI)
9 Fax Answering signal detected (e.g. T.30 CED, DIS)
A Fax Calling signal detected (e.g. T.30 CNG)
B V.8bis signal detected
C-F Reserved
Code Definition
0 Data Only
1 FAX Only
2 Voice Only * if voice mode supported (e.g. V.253, IS-101)
9 Video-telephony, H.324
A Other V.80 call
Code Definition
0 Async data
1 V.80 transparent synchronous mode
2 V.80 framed synchronous mode
3-F Reserved
bits Source bits Definition
31-30 INFO0 bit 20; 0
20-29 INFOc bits 79-88
16-19 INFOc bits 26-29 or 35-38 or 44-47 or Pre-emphasis field, selected by 53-56- or 62-65 or 71-74 the symbol rate chosen
12-15 INFOa bits 26-29
10-11 MP bit 50; 0
0-9 INFOa bits 40-49
Value Description
0 V.17 (G3 Fax call)
1 V.21
2 V.22
3 V.22bis
4 V.23
A V.32
B V.32bis
C V.34
E V.90 Issue 1 (asymmetric)
81 K56FLEX
82 V.FC
83 V.32terbo 84 Bell 212A (if modem supports B212A)
85 Bell 103 (if modem supports B103)
Value Description
0 Disable/none
1 V.42 LAPM
2 V.42 Alterative protocol (MNP)
Value Description
0 None
1 V.42bis
80 MNP5
Value Description Notes
0 CauseUnidentified Call setup issues
1 No Previous call
2 Call is still in progress
3 Call Waiting signal detected
4 Delayed Same as value 2A, CallAttemptsLimitExceeded
A NMSinitiatedDialCall -- Network Management System
B NMSinitiatedLeasedLineRestoral
C NMSinitiatedRedial
D NMSinitiatedDialDisconnect
14 PowerLoss DCE
15 EquipmentFailure
16 FrontPanelDisconnectRequested If there is a front panel with this control
17 FrontPanelLeasedLineRestoral
18 AutomaticLeasedLineRestoral
19 InactivityTimerExpired
1E cct116RestoralRequest DTE Interface
1F cct108isOffInhibitsDial
20 cct108turnedOff This is hangup with &D2
28 NoNumberProvided Prohibited by some national regulations
29 BlacklistedNumber
2A CallAttemptsLimitExceeded Same as Delayed, see ETS 300 001
2B ExtensionPhoneOffHook If extension detection supported
2C CallSetupFailTimerExpired e.g. S7 timeout
2D IncomingCallDetected If incoming call while sending dial command.
2E LoopCurrentInterrupted
2F NoDialTone
30 VoiceDetected
31 ReorderTone
32 SitTone
33 EngagedTone
34 LongSpaceDisconnect And if modem program to abort on long space
3C CarrierLost Signal Converter
3D TrainingFailed
3E NoModulationinCommon
3F RetrainFailed
40 RetrainAttemptCountExceeded
41 GstnCleardownReceived
42 FaxDetected If this was not a fax call attempt (note 10)
46 InTestMode Test
47 IntrusiveSelfTestInitiated
50 AnyKeyAbort Call Control
51 DteHangupCommand If ATH was used to terminate the previous call.
52 DteResetCommand If ATZ was used to terminate the previous call.
5A FrameReject Error Control
5B NoErrorControlEstablished Error control was required
5C ProtocolViolation
5D n400exceeded
5E NegotiationFailed
5F DisconnectFrameReceived
60 SabmeFrameReceived
64 LossOfSynchronization Data Compression
The S-Registers are summarized in the following table. Registers denoted with a * may be customized using the PTT Wizard Tool.
Factory defaults are stored in the Windows OS registry. They are loaded at initialization time or by AT commands (&F,Z). In addition the designated default profile (as specified by the Yn command) is subsequently loaded. The defaults shown are of the factory settings 0 and 1.
S# Function Range Units PW Default AT Command
S0 Rings to Auto-Answer 0-255 rings 0 A
S1 Ring Counter 0-255 rings 0
S2 Escape Character 0-255 ASCII 43
S3 CR Character 0-255 ASCII 13
S4 LF Character 0-255 ASCII 10
S5 BS Character 0-255 ASCII 8
S6 Wait Time for Dial Tone (Also wait before Blind Dialing) 2-255 s * 2 D
S7 Wait Time for Carrier 1-255 s * 60 D
S8 Pause Time for Dial (,) 0-255 s 2 D
S9 Carrier Detect Response Time 1-255 0.1s 6
S10 Carrier Loss Disconnect Time 1-255 0.1s * 7
S11 DTMF Tone duration 50-255 0.001s * 100 D
S# Function Range Units PW Default AT Command
S12 Reserved
S13 Echo 0-1 1 E
S14 Quiet 0-1 0 Q
S15 Verbose 0-1 1 V
S16 Pulse/ Tone 0-1 * 1 T,P,D
S17 Reserved
S18 Test Timer 0-255 s 0 &T
S19 System Inactivity Timer 0-255 min 0
S20 Reserved
S21 Break Length 0-9 100ms 9 \B
S22 Origin/Answer 0-1 0
S23 XOFF Character (NA) 0-127 ASCII 19
S24 Flash Timer 0-255 10 ms 20