| Command |
Function |
| AT |
Attention - this precedes all commands except A/ and
+++ |
| A/ |
Execute previous command - does not require a
<CR> |
| A |
Causes the modem to go off hook. If a call is coming in,
the modem will try to answer it. The precedure for answering a call is a
short silence and then an answer tone. Sending a character to the modem
during this procedure will abort the answer sequence. The amount of time
the modem will wait for a carrier is programmable by modifying the S7
register. |
| B0 |
Select CCITT V.22 (1200 bps) |
| B1 |
Select Bell 212A (1200 bps) |
| B2 |
Select CCITT V23 - Originate mode will transmit data at
75 bps and receive data at 1200 bps. Answer mode will transmit data at
1200 bps and receive data at 75 bps. The command N0 (disable auto mode)
must be selected. |
| D |
D alone will take the modem off-hook and wait for a dial
tone. (see X command for exceptions). The length of time to wait for a
dial tone before dialing is programmable in register S6. |
| Dmn |
ATDmn will dial a phone number where m is the modifier:
L, W, ,, ;, @, or S. It will dial the telephone number n. |
| L |
Dial last number |
| W |
Wait for dial tone. If you have selected X0 or X1
(disable dial tone detection), then you can use this modifier to override
that setting. |
| , |
Pause during dial. Thie amount of time to pause is
determined in register S8. |
| ; |
Return to command mode after dialing. It does not wait
for carrier or hang up. |
| @ |
Wait for 5 seconds of silence. This is used to access
systems that do not provide a dial tone. |
| ! |
Hook flash. Causes the modem to go on-hook for 0.5
seconds. This is used in PBX systems and for voice features like call
waiting. |
| S=(0-9) |
Dials a stored number. Up to ten numbers can be stored,
and the addresses are from 0 to 9. To store a number into one of these
addresses, use the &Z command. |
| E0 |
Commands issued to the modem are not echoed to the local
terminal. This only matters in the command mode. It does not affect the
modem's ability to send response codes. |
| E1 |
Commands are echoed to the local
terminal. |
| H0 |
Force modem on-hook (hang-up) |
| H1 |
Force modem off-hook (to answer or dial). |
| I0 |
Return numeric product code |
| I1 |
Return hardware variation code |
| I2 |
Report internal code |
| I3 |
Report software revision number |
| I4 |
Report product feature listing |
| L0 |
Speaker volume zero |
| L1 |
Speaker volume low |
| L2 |
Speaker volume low |
| L3 |
Speaker volume low (Hardware currently limits volume
adjustment to on/off) |
| M0 |
Speaker always off |
| M1 |
Speaker on until carrier
detected |
| M2 |
Speaker always on |
| M3 |
Speaker on during answering only |
| N0 |
Disable auto-mode. This forces the modem to connect at
the speed specified in register S37 |
| N1 |
Enable auto-mode. The modem will answer at the
highest available line speed and ignore any ATBn
command. |
| O0 |
Return to data mode. If you have entered the command mode
using the time independent escape sequence, this will put you back in data
mode without going on-hook. |
| O1 |
Retrain the modem. If the line condition has changed
since the original connection, retraining the modem will cause it to
reconnect at the most efficient speed for the current line
condition. |
| P |
Pulse dialing allows the modem to work on telephone
networks where one is not supported. Pulse and tone dialing cannot be
mixed on the same command line. |
| Q0 |
Enable response to DTE. |
| Q1 |
Disable response to DTE. The modem does not respond to
the terminal. Issuing a command will not produce a response (unless the
command is something like ATZ, which will restore this setting to
default). |
| Sn |
Set default S-register. Any subsequent = or ? commands
will modify the default S register. |
| Sn=m |
Set register n to value m |
| Sn? |
Return the value of register n |
| T |
Tone dialing - Pulse and tone dialing can not be
mixed on the same command line. |
| V0 |
Result codes will be sent in numeric form. (See the
result code table) |
| V1 |
Result codes will be sent in work form. (See the result
code table.) |
| W0 |
Report DTE speed only. After connection, there
will be no message about what Error Correction or Data Compression
protocol is in use. |
| W1 |
Report DCE speed, Error Correction/Data Compression
protocol, and DTE speed |
| W2 |
Report DCE speed only |
| X0 |
Send OK, CONNECT, RING, NO CARRIER, ERROR and NO ANSWER.
Busy and dial tone detection are disabled. |
| X1 |
Send X0 messages and CONNECT speed |
| X2 |
Send X1 messages and NO DIAL TONE. |
| X3 |
Send X2 messages and BUSY and RING BACK. Dial tone
detection is disabled. |
| X4 |
Send all responses. |
| Y0 |
Disable long space
disconnect. |
| Y1 |
Enable long space disconnect; with error correction, hang
up after sending 1.6 second long space; without error correction, hang up
after 4 second long space. |
| Z0 |
Reset modem to profile 0 |
| Z1 |
Reset modem to profile 1 |
| +++ |
This is the default escape sequence. Transfers the modem
from data mode to command mode. Must be preceded by at least 1 second of
no characters and followed by one second of no characters. O0 (ATO0 or
ATO) returns the modem to data mode. |
| =n |
Sets the value of the default S register. |
| & |
Ampersand commands |
| &C0 |
Force data carrier detect (DCD)
on |
| &C1 |
DCD follows remote carrier |
| &D0 |
DTR is assumed on |
| &D1 |
DTR drop causes modem to go back to command mode without
disconnecting |
| &D2 |
DTR drop causes modem to hang up |
| &D3 |
DTR drop causes modem to initialize; &Y determines
which profile is loaded. |
| &F |
Load factory profile |
| &K0 |
Disable flow control |
| &K3 |
Enable RTS/CTS flow control |
| &K4 |
Enable XON/XOFF flow control |
| &K5 |
Enable transparent software flow control |
| &K6 |
Enable both RTS/CTS and XON/XOFF flow
control |
| &P0 |
Selects 33%-67% make/break ratio at 10 pulses per
second. |
| &P1 |
Selects 33%-67% make/break ration at 20 pulses per
second |
| &P2 |
Selects 33%-61% make/break ration at 10 pulses per
second |
| &P3 |
Selects 33%-61% make/break ration at 20 pulses per
second |
| &S0 |
Force DSR on |
| &S1 |
DSR on at the start of handshaking and off after carrier
loss |
| &T0 |
Terminate test |
| &V0 |
Display active profile |
| &V1 |
Display stored profiles |
| &V2 |
Display stored telephone numbers |
| &W0 |
Save active profile to profile 0 |
| &W1 |
Save active profile to profile 1 |
| &Y0 |
Use profile 0 on powerup |
| &Y1 |
Use profile 1 on powerup |
| &Zn=m |
Save telephone number (up to 36 digits) into memory
location n (0-9) |
| % |
Percent commands |
| %A |
Default is set to each country encoding law. For example,
for USA %A is 0, for Germany %A is 1. |
| %A0 |
Mu-law encoding |
| %A1 |
A-law encoding |
| %C0 |
Disable data compression |
| %C1 |
Enable MNP5 compression |
| %C2 |
Enable V.42bis compression |
| %C3 |
Enable both V.42bis and
MNP5 |
| %E0 |
Disable auto-retrain |
| %E1 |
Enable auto-retrain |
| %E2 |
Enable auto-retrain and
fallback |
| %E3 |
Enable auto-retrain and fast hang up |
| %L |
Report received signal level in -dBm |
| %N0 |
Dynamic CPU loading disabled |
| %N1 |
Dynamic CPU loading not to exceed 10% |
| %N2 |
Dyanmic CPU loading not to exceed 20% |
| %N3 |
Dyanmic CPU loading not to exceed 30% |
| %N4 |
Dyanmic CPU loading not to exceed 40% |
| %N5 |
Dyanmic CPU loading not to exceed 50% |
| %N6 |
Dyanmic CPU loading not to exceed 60% |
| %N7 |
Dyanmic CPU loading not to exceed
70% |
| %N8 |
Dyanmic CPU loading not to exceed 80% |
| %N9 |
Dyanmic CPU loading not to exceed 90% |
| %Q |
Report line signal quality |
| \ |
Backslash commands |
| \A0 |
64-character max MNP block size |
| \A1 |
128-character max. MNP block
size |
| \A2 |
192-character max. MNP block size |
| \A3 |
256-character max. MNP block size |
| \Bn |
In non-error correction mode, transmit break in 100 ms
units (1-9 with default 3) |
| \G0 |
Disable XON/XOFF flow control (modem to
modem) |
| \G1 |
Enable XON/XOFF flow control (modem to
modem) |
| \Kn |
Define break type |
| \L0 |
Use stream mode for MNP |
| \L1 |
Use interactive block mode for MNP |
| \N0 |
Normal mode; speed control without error
correction |
| \N1 |
Plain mode; no speed control and no error
correction |
| \N2 |
Reliable mode |
| \N3 |
Auto-reliable mode |
| \N4 |
LAPM error correction only |
| \N5 |
MNP error correction only |
| * |
Asterisk commands |
| *Q0 |
Send the "CONNECT xxxx" result codes to the DTE
when an invalid TIES escape sequence is detected after the "OK" response
has already been sent |
| *Q1 |
Does NOT send the "CONNECT xxxx" result codes to the DTE
when an invalid TIES escape sequence is detected after the "OK" response
has already been sent |
| S Registers |
|
| Reg. 0 |
Rings to auto-answer. Sets the number of rings required
before the modem answers. 0 setting disable auto-answer. Range is 0-255
rings. Default is 0 for auto-answer disabled. |
| Reg. 1 |
Ring counter. Counts the number of rings before the modem
answers. Range is 0-255 rings. Default is 0. |
| Reg. 2 |
Escape character. Defines the character used for the
three-charracter escape code sequence. 0 setting disables the escape code
character. Range is 0-127. Default is 43 (+) |
| Reg. 3 |
Carriage return character. Defines the character for
carriage return. Range is 0-127. Default is 13 (carriage
return). |
| Reg. 4 |
Line feed character. Defines the character for the line
feed. Range is 0-127. Default is 10 (line feed). |
| Reg. 5 |
Backspace character. Defines the character for the
backspace. Range is 0-127. Default is 8 (backspace) |
| Reg. 6 |
Wait before dialing. Sets the length of time to pause
after off-hook before dial. Range is 2-255 seconds. Default is 2
seconds. |
| Reg. 7 |
Wait for carrier after dialing. Sets the length of time
that the modem waits for a carrier from the remote modem before hanging
up. Range is 1-255 seconds. Default is 50 seconds. |
| Reg. 8 |
Pause time for dial delay. Sets the length of time to
pause for the pause dial modifier ",". Range is 0-255 seconds. Default is
2 seconds. |
| Reg. 9 |
Carrier detect response time. Defines the length of time
a signal is detected and qualified as a carrier. Range is 1-255 tenths of
a second. Default is 6 (0.6 seconds) |
| Reg. 10 |
Lost carrier hang up delay. Sets the length of time the
modem waits before hanging up for a carrier loss. Range is 1-255 tenths of
a seconds. Default is 14 (6 seconds ????) |
| Reg. 11 |
DTMF speed control. Sets the length of tone and the time
between tones for the tone dialing. Range is 50-255 milliseconds. Default
is 95 milliseconds. |
| Reg. 12 |
Escape Prompt Delay (EPD) timer. Sets the time from
detection of the last character of the three character escape sequence
until the "K" is returned to the DTE. Range is 0-255 fiftieths of a
second. Default is 50 (1 second) |
| Reg. 13 |
Reserved |
| Reg. 14 |
Reserved |
| Reg. 15 |
Reserved |
| Reg. 16 |
Reserved |
| Reg. 17 |
Reserved |
| Reg. 18 |
Test timer. Sets the length of loopback test. Range is
0-255 seconds. Default is 0 (disable timer) |
| Reg. 19 |
Reserved |
| Reg. 20 |
Reserved |
| Reg. 21 |
Reserved |
| Reg. 22 |
Reserved |
| Reg. 23 |
Reserved |
| Reg. 24 |
Reserved |
| Reg. 25 |
Delay to DTR. Sets the length of time the modem ignores
DTR before hanging up. Range is 0-255 hundredths of a seconds. Dafault is
5 (0.05 seconds) |
| Reg. 26 |
Reserved |
| Reg. 27 |
Reserved |
| Reg. 28 |
Reserved |
| Reg. 30 |
Disconnect inactivity timer. Sets the length of time
allowed for inactivity before the connection is hung up. Range is 0-255 in
minutes. Default is 0 (disabled) |
| Reg. 32 |
XON character. Sets the value of XON character. Range is
0-255. Default is 17 |
| Reg. 33 |
XOFF character. Sets the value of XOFF character. Range
is 0-255. Default is 19. |
| Reg. 34 |
56k data rate (bit-rate). Sets the maximum bit rate for
56K. Range is 0-32. Bit rate = 32000bps + S34*2000bps. V.34 data rate
(bit-rate). Sets the maximum bit rate for V.34. Range is 0-8 (2400 baud),
1-10 (3000 baud), 1-11 (3200 baud), 1-13 (3429 baud) Bit rate =
((S34)+1)*2400bps. Default is 13 (33600 bps) |
| Reg. 36 |
Reserved |
| Reg. 37 |
Line connection speed. 0-Attempt to connect at the
highest speed. 3-Attempt to connect at 300 bps. 4-Attempt to connect at
1200 bps. 6-Attempt to connect at 2400 bps. 7-Attempt to connect at 4800
bps. 8-Attempt to connect at 7200 bps. 9-Attempt to connect at 9600 bps.
10-Attempt to connect at 12000 bps. 11-Attempt to connect at 14400 bps.
12-Attempt to connect at V.34. 13-Attempt to connect at 56K, Default is
0. |
| Reg. 38 |
Delay before forced hang-up. Sets the delay to hang up
after the disconnecting command is received. Range is 0-255 seconds.
Default is 20 seconds. |
| Reg. 39 |
Reserved |
| Reg. 40 |
Reserved |
| Reg. 41 |
Reserved |
| Reg. 42 |
Reserved |
| Reg. 43 |
Reserved |
| Reg. 44 |
Reserved |
| Reg. 45 |
Reserved |
| Reg. 46 |
Reserved |
| Reg. 47 |
Reserved |
| Reg. 48 |
Reserved |
| Reg. 82 |
Reserved |
| Reg. 86 |
Call failure reason code. 0-Normal disconnect (no error),
4-Loss of carrier, 5-V.42 negotiation failed to detect an error correction
modem at remote end, 6-No response to complete negotiation, 9-No common
protocol, 12-Remote initiated a normal disconnect, 13- Remote modem did
not respond after 10 message retransmissions, 14-Protocol violation, 15-
Compression failure, 20- Hang up by inactivity time out. |
| Reg. 91 |
Transmit level. Set the transmit level in -dBm. Range is
9-15 (-dBm). Default is 11 (-11 dBm) |
| Class 8 |
Voice Mode AT Commands Summary |
| ATA |
Answering in Voice Mode |
| ATD |
Dial command in Voice Mode |
| ATH |
Hang up in Voice Mode |
| ATZ |
Reset from Voice Mode |
| AT#BDR |
Select baud rate (turn off autobaud) |
| AT#CID |
Enable Caller ID detection and select reporting
format |
| AT#CLS |
Select data, fax, or voice |
| AT#MDL? |
Identify model |
| AT#MFR? |
Identify manufacturer |
| AT#TL |
Transmit level control |
| AT#REV? |
Identify revision level |
| AT#RG |
Record gain control |
| AT#SPK |
Change the setting of Speakerphone |
| AT#VBS |
Bits per sample (ADPCM) |
| AT#VBT |
Beep tone timer |
| AT#VLS |
Voice line select (ADPCM) |
| AT#VRA |
Ringback goes away timer (originate) |
| AT#VRX |
Voice Receive Mode (ADPCM) |
| AT#VSD |
Silence deletion tuner (voice receive,
ADPCM) |
| AT#VSP |
Silence detection period (voice receive,
ADPCM) |
| AT#VSS |
Silence sensitivity tuner (voice receive) |
| AT#VTX |
Voice Transmit Mode (ADPCM) |
| AT#VBQ? |
Query buffer size |
| AT#VCI? |
Identify compression method (ADPCM) |
| AT#VRN |
Ringback never came timer (originate) |
| AT#VSK |
Buffer skid setting |
| AT#VSR |
Sampling rate selection (ADPCM) |
| AT#VTD |
DTMF/tone reporting capability |
| AT#VTS |
Play tone string (online voice
command) |
PRODUCTS · 
USEFUL INFO · 
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