Hayes H08-15328 Reference Manual

Manual
August 2000

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Manual

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AT Command Reference Manual

August 2000

AT Command Set

AT commands are issued to the modem to control the modem’s operation and software configuration. AT com­mands can only be entered while the modem is in command mode. The format for entering commands is ATXn
where X is the AT command and n is the specific value for that command.

Any command issued is acknowledged with a response in either text or numeric values. These responses are
known as result codes. The result codes are listed in Table 59.

Commands may be executed while in COMMAND mode, which is entered under one of the following conditions:

■ After powerup, at the termination of a connection, or after the execution of a command other than dial or answer.

■ Upon the receipt of the escape sequence (three consecutive characters matching the contents of register S2)

while in on-line mode.

■ Upon the on-to-off transition of DTR if &D1, &D2, or &D3 has been set.

Table 1. AT Command Set Summary

Command Description Command Description

A/ Repeat last command. &Qn Asynchronous communications mode.

A Answer. &Sn Data set ready (DSR) option.
Bn Communication standard setting. &Tn Self-test commands.
Cn Carrier control. &Vn View active configuration.
Dn Dial. &Wn Store current configuration.
En Echo command. &Yn Select stored profile for hard reset.
Fn On-line data character echo command. &Zn Store telephone number.

MNP

Hn Hook control. \An Select

In Request ID information. \Bn Send break.

Ln Speaker volume. \Gn Modem port flow control.

Mn Speaker control. \Jn Adjust bits/s rate control.
Nn Modulation handshake. \Kn Set break control.
On Return to on-line data mode. \Nn Select error control mode.

P Select pulse dialing. \Qn Local flow control selection.

Qn Result code control. \Rn Ring indicator off after answer.

T Select tone dialing. \Tn Inactivity timer.
Vn DCE response format. \Vn Protocol result code.

Wn Result code option. \Xn XON/XOFF pass through.

Xn Select result code and monitor call progress. %Bn View numbers in blacklist.
Yn Long-space disconnect. %Cn Data compression control.
Zn Reset and recall stored profile. %En Auto fallback/fallforward control.

&Bn V.32 auto retrain. )C Enable Direct Connect.
&Cn Data carrier detect (DCD) control. &&C Write to/read from DSP register.
&Dn Data terminal ready (DTR) control. &&L Line-to-line loopback.
&Fn Restore factory default configuration. &&R Write to/read from DSP RAM location.
&Gn V.22bis guard tone control. &&S Speaker codec loopback.

&Jn Auxiliary relay options. %T94 Test ex ternal RAM.

&Kn Local flow control selection. %T124 Test DSP 56K version in external RAM.

&Mn Asynchronous communications mode. %T125 Test DSP 56K version in external RAM.

&Pn Pulse dial make-to-break ratio selection. #UD Unimodem diagnostics.

* bloc k size.

*

MNP

is a trademark of Microcom, Inc.

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AT Command Set (continued)

Escape Sequence

The escape sequence allows the modem to exit data mode and enter on-line command mode. While in on-line
command mode, you may communicate directly to the modem using AT commands. Use the On command to
return to data mode.

A pause, the length of which is set by the escape guard time (register S12), must be used before and after an
escape sequence is issued. This pause prevents the modem from interpreting the escape sequence as data. The
value of the escape sequence character may be changed using register S2.

A/—Repeat Last Command

The A/ command instructs the modem to repeat the last AT command. It will repeat the command already in the
command buffer. This command does not require the AT prefix and does not have to be followed by the terminator
character. It is primarily used to redial the last number in the case of a busy signal.

A—Answer

This command instructs the modem to go off-hook and answer an incoming call.

Bn—Communication Stand ard Setting

This command determines the communication standard used by the modem.
Result codes:

■ OK if n = 0—3, 15, 16.

■ ERROR if n

Table 2. Bn Commands

Command Function

B0 Selects CCITT V.22 mode when the modem is at 1200 bits/s.
B1 Selects Bell 212A when the modem is at 1200 bits/s (default).
B2 Deselects V.23 reverse channel (same as B3).

B3 Deselects V.23 reverse channel (same as B2).
B15 Selects V.21 when the modem is at 300 bits/s.
B16 Selects Bell 103J when the modem is at 300 bits/s (default).

0—3, 15, 16.

≠

Cn—Carrier Control

The modem will accept the C1 command without error in order to ensure backward compatibility with communica­tions software that issues the C1 command. However, this modem does not support the C0 command. The C0
command may instruct some other modems not to send carrier (i.e., it puts them in receive-only mode).

Result codes:

■ OK if n = 1.

■ ERROR if n ≠ 1.

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AT Command Set (continued)

Table 3. Cn Commands

Command Function

C0 Transmit carrier always off (not supported).
C1 Normal transmit carrier switching (default).

Dn—Dial

This command instructs the modem to go off-hook and begin the dialing sequence. The dial string (n, including
modifiers and the telephone number) is entered after the ATD command.

A dial string can be up to sixty characters long. Any digit or symbol may be dialed as touchtone digits. Characters
such as spaces, hyphens, and parentheses are ignored by the modem and may be included in the dial string to
enhance readability.

Table 4. Dial Modifiers

Modifier Function

L Dial the last number. This modifier is valid only if it is the first symbol of the dial string. All con-

secutive characters are discarded.
P Use pulse dialing.
T Use tone dialing (default).

W Wait for dial tone. The modem will wait for a second dial tone before processing the dial string.

V The modem switches to speakerphone mode and dials the number. The Hn command may be

used to disconnect the voice call.

, Dial pause. The modem will wait for the time specified by register S8 before continuing to dial.
! Hook flash. The modem will go on-hook for 0.5 seconds and then return to off-hook.

@ W ait for quiet answ er . The modem will wait for 5 seconds of silence after dialing the number. If

silence is not detected, the modem sends a NO ANSWER result code back to the user.

; Return to command mode. This modifier instructs the modem to return to command mode

after it has finished dialing without disconnecting the call.
^ Disable data calling tone transmission.
$ Bong tone detection.

S=n Dial a telephone number previously stored using the &Zn=x command. The range is 0—2.

En—Echo Command

This command controls whether or not the characters entered from the computer keyboard are echoed back to the
monitor while in command mode.

Result codes:

■ OK if n = 0—1.

■ ERROR if n ≠ 0—1.

Table 5. En Commands

Command Function

E0 Disables echo command.
E1 Enables echo command (default).

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AT Command Set (continued)

Fn—On-Line Data Character Echo Command

This command determines if the modem will echo data from the DTE. The modem does not support the F0 version
of the command. However, to ensure backward compatibility, the modem will accept F1, which may be issued by
older communication software.

Result codes:

■ OK if n = 1.

■ ERROR if n

≠

1.

Table 6. Fn Commands

Command Function

F0 On-line data character echo enabled (not supported by the modem).
F1 On-line data character echo disabled.

Hn—Hook Control

This command instructs the modem to go either on-hook to disconnect a call or off-hook to make the telephone line
busy.

Result codes:

■ OK if n = 0—1.

■ ERROR if n

Table 7. Hn Commands

Command Function

H0 The modem goes on-hook (default).
H1 The modem goes off-hook.

0—1.

≠

In—Request ID Information

This command displays specific product information about the modem.
Result codes:

■ As described in Table 8 if n = 0—9, 11.

■ ERROR if n ≠ 0—9, 11.

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AT Command Set (continued)

Table 8. In Commands

Command Function

I0, I3 Returns modem identity string and driver version number (default).

I1 Calculates a ROM checksum and displays it on the DTE.
I2 Performs a ROM check, calculates the checksum, and then verifies the checksum by display-

ing OK or ERROR.

I4 Returns firmware version for the data pump.
I5 Returns the code version, board ID, and country ID in hexadecimal.

I6, I7, I8 Returns OK for compatibility.

I9 Returns country ID in English.

I11 Displays connection information as described below.

The ATI11 results are listed on two screens. T o get to the second screen, the user must hit any key. The following is
an example of the ATI11 results.

Description Status Status

--------------- -------------------- --------------------

1 Last Connection 56K V.90
2 Initial Transmit Carrier Rate 28800 28800
3 Initial Receive Carrier Rate 50000 49333
4 Final Transmit Carrier Rate 28800 28800
5 Final Receive Carrier Rate 50000 49333
6 Protocol Negotiation Result LAPM LAPM
7 Data Compression Result V42bis V42bis
8 Estimated Noise Level 152 152
9 Receive Signal Poser Level (–dBm) 25 25

10 Transmit Signal Power Level (–dBm) 16 16
11 Round Trip Delay (msec) 4 4
Press any key to continue; ESC to quit

Description Status Status

--------------- -------------------- --------------------

12 Near Echo Level (–dBm) NA NA
13 Far Echo Level (–dBm) NA NA
14 Transmit Frame Count 3 3
15 Transmit Frame Error Count 0 0
16 Receive Frame Count 0 0
17 Receive Frame Error Count 0 0
18 Retrain by Local Modem 0 0
19 Retrain by Remote Modem 0 0
20 Rate Renegotiation by Local Modem 0 0
21 Rate Renegotiation by Remote Modem 0 0
22 Call Termination Cause 0 0
23 Robbed-Bit Signalling 00 00
24 Digital Loss (dB) 6 6
25 Remote Server ID 4342C3 NA

26 Last PCM S PTR
OK

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AT Command Set (continued)

The ATI11 command may be issued from on-line command mode or after the end of a call. After a call, some of the
values are no longer valid. The following table describes each of the results listed for the ATI11 command.

Table 9. ATI11 Command Results

Result Description

Last Connection V.90, 56K, V.34, or V.32, depending on the type of connection negotiated.

Initial Transm it Carrier Rate Initial upstream rate.

Initial Receive Carrier Rate Initial downstrea m rate.
Final Transmit Carrier Rate Current or final upstream rate.

Final Receive Carrier Rate Current or final downstream rate.

MNP

Protocol Negotiation Result LAPM,

Data Compression Result LAPM,

Estimated Noise Level Mean-square error of received downstream signal. Difference between

received constellation point and reference decision point. This is a dimen­sionless decimal number that is only valid during a call. Higher numbers
are worse. There is no absolute threshold of goodness; it depends on the
downstream data rate. The number varies during a call, so it is useful to
sample it a few times.

Receive Signal Power Level (–dBm) The received signal power, although labeled with units of -dBm, is only a

relative measure for comparing calls to/from different locations. This
value is valid only during a call.

Transmit Signal Power Level (–dBm) Upstream transmit signal power.

Round Trip Delay (ms) Round trip delay in milliseconds.

Near Echo Level (–dBm) Echo levels are valid for V.34 only.

Far Echo Level (–dBm) Echo levels are valid for V.34 only.

Transmit Frame Count Number of LAPM frames sent upstream during this call. Count wraps

around at 65535.

Transmit Frame Error Count Number of REJ frames received at the analog client modem.

Receive Frame Count Number of LAPM frames received by the client during this call. Count

wraps around at 65535.

Receive Frame Error Count Number of frames received in error by the client.

Retrain by Local Modem Number of retrains or rate renegotiations requested by the modem.

Retrain by Remote Modem Number of retrains or rate renegotiations requested by remote modem.

Rate Renegotiation by Local Modem Number of rate renegotiations requested by the local modem.

Renegotiation by Remote Modem Number of rate renegotiations requested by the remote modem.

Rate

Call Termination Cause Reason for call ending. Only valid after call ends. Result codes are as fol-

lows:

■ 0 = local modem command: ATH, DTR drop.

■ 1 = remote modem: cleardown, loss of signal.

■ 2 = no answer, busy, etc.

■ 3 = training failure V.90, K56flex, or V.34.

■ 4 = protocol failure if required by \N4, for example.

Robbed-Bit Signaling For PCM connection only, a hexadecimal 6-bit pattern of T1 frames with

robbed-bit signaling.

Digital Loss (dB) For PCM connection only, the downstream digital loss.

Remote Server ID For K56flex connection only, the V.8bis information sent by the server.

Meaning is defined at the server and by convention.

Last PCM S PTR Shows

, or none, depending on V.42 negotiation.

MNP

, V.42bis, or none, depending on V.42 negotiation.

the last S pointer when the modem is expected to go to PCM mode.

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AT Command Set (continued)

Ln—Speaker Volume

This command instructs the modem to use the specified speaker volume setting when the speaker is on. Result
codes:

■ OK if n = 0—3.

■ ERROR if n

0—3.

≠

Table 10. Ln Commands

Command Function

L0 Low volume.
L1 Low volume.
L2 Medium volume (default).
L3 High volume.

Mn—Speaker Control

This command turns the speaker on and off.
Result codes:

■ OK if n = 0—3.

■ ERROR if n

Table 11. Mn Commands

Command Function

M0 Speaker is off.
M1 Speaker is on until the modem detects the carrier signal (default).
M2 Speaker is always on when the modem is off-hook.
M3 Speaker is on until the carrier is detected, except when dialing.

0—3.

≠

Nn—Modulation Handshake

This command controls whether or not the local modem performs a negotiated handshake at connection time with
the remote modem when the communication speed of the two modems is different.

Result codes:

■ OK if n = 0—1.

■ ERROR if n ≠ 0—1.

Table 12. Nn Commands

Command Function

N0 When originating or answering, this is for handshake only at the communication standard speci-

fied by register S37 and the Bn command.

N1 When originating or answering, begin the handshake only at the communication standard speci-

fied by S37 and the Bn command. During handshake, fallback to a lower speed may occur
(default).

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AT Command Set (continued)

On—Return to On-Line Data Mode

Result codes:

■ OK if n = 0—1, 3.

■ ERROR if n

Table 13. On Commands

Command Function

O0 Instructs the modem to exit on-line command mode and return to data mode (default).*
O1 Issues a retrain before returning to on-line data mode.
O3 Issues a rate renegotiation before returning to on-line data mode.

* See Escape Sequence section on page 3.

P—Select Pulse Dialing

0—1, 3.

≠

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This command configures the modem for pulse dialing. Dialed digits are pulsed until a T command or dial modifier
is received. Tone dialing is the default setting.

Qn—Result Code Control

Result codes are informational messages sent from the modem and displayed on the monitor. Basic result codes
include OK, CONNECT , RING, NO CARRIER, and ERROR. The Qn command allows the user to turn result codes
on or off.

Result codes:

■ OK if n = 0—1.

■ ERROR if n

0—1.

≠

Table 14. Qn Commands

Command Function

Q0 Enables result codes (default).
Q1 Disables result codes.

T—Select Tone Dialing

This command instructs the modem to send DTMF tones while dialing. Dialed digits are tone dialed until a P com­mand or dial modifier is received. This is the default setting.

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AT Command Set (continued)

Vn—DCE Response Format

This command controls whether result codes, including call progress and negotiation progress messages, are dis­played as words or their numeric equivalents.

Result codes:

■ OK if n = 0—1.

■ ERROR if n

0—1.

≠

Table 15. Vn Commands

Command Function

V0 Displays result codes as digits.
V1 Displays result codes as text (default).

Table 16. Vn Result Code Formats

Command Result Code Format

V0 <numeric code><CR>
V1 <CR><LF><verbose code><CR><LF>

Wn—Result Code Option

This command controls the format of CONNECT messages.
Result codes:

■ OK if n = 0—2.

■ ERROR if n

Table 17. Wn Commands

0—2.

≠

Command Function

W0 CONNECT result code reports DTE receive speed. Disables protocol result codes.
W1 CONNECT result code reports DTE receive speed. Enables protocol result codes.
W2 CONNECT result code reports DCE receive speed. Enables protocol result codes (default).

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AT Command Set (continued)

Xn—Select Result Code and M on ito r Cal l Progress

This command enables tone detection options used in the dialing process. As these functions are chosen, the

modem’s result codes are also affected. Therefore, this command is frequently used to control the modem’s
responses. The primary function of this command is to control call response capabilities.

Result codes:

■ OK if n = 0—7.

■ ERROR if n

Table 18. Xn Commands

Command Extended Result Codes Dial Tone Detect Busy Tone Detect

X0 Disabled. Displays only the

X1 Enabled. Displays basic

X2 Enabled. Displays basic

X3 Enabled. Displays basic

X4 Enabled. Displays basic

X5 Enabled. Displays basic

X6 Enabled. Displays basic

X7 Disabled. Displays only the

0—7.

≠

following basic result codes:
OK, CONNECT, RING, NO
CARRIER, and ERROR.

result codes, connect mes­sage, data rate, and an indi­cation of error correction and
data compression operation.

result codes, connect mes­sage, data rate, and an indi­cation of error correction and
data compression operation.

result codes, connect mes­sage, data rate, and an indi­cation of error correction and
data compression operation.

result codes, connect mes­sage, data rate, and an indi­cation of error correction and
data compression operation.

result codes, connect mes­sage, data rate, and an indi­cation of error correction and
data compression operation.

result codes, connect mes­sage, data rate, and an indi­cation of error correction and
data compression operation.

following basic result codes:
OK, CONNECT, RING, NO
CARRIER, and ERROR.

Disabled. The modem dials a call
regardless of whether it detects a
dial tone. The period of time the
modem waits before dialing is
specified in register S6.

Disabled. The modem dials a call
regardless of whether it detects a
dial tone. The period of time the
modem waits before dialing is
specified in register S6.

Enabled. The modem dials only
upon detection of a dial tone and
disconnects the call if the dial tone
is not detected within 10 seconds.

Disabled. The modem dials a call
regardless of whether it detects a
dial tone. The period of time the
modem waits before dialing is
specified in register S6.

Enabled. The modem dials only
upon detection of a dial tone and
disconnects the call if the dial tone
is not detected within 10 seconds.

Enabled. The modem dials only
upon detection of a dial tone and
disconnects the call if the dial tone
is not detected within 10 seconds.

Enabled. The modem dials only
upon detection of a dial tone and
disconnects the call if the dial tone
is not detected within 10 seconds.

Enabled. The modem dials only
upon detection of a dial tone and
disconnects the call if the dial tone
is not detected within 10 seconds.

Disabled. The modem ignores
any busy tones it receives.

Disabled. The modem ignores
any busy tones it receives.

Disabled. The modem ignores
any busy tones it receives.

Enabled. The modem monitors
for busy tones.

Enabled. The modem monitors
for busy tones (default).

Enabled. The modem monitors
for busy tones.

Enabled. The modem monitors
for busy tones.

Enabled. The modem monitors
for busy tones.

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AT Command Set (continued)

Yn—Long-Space Disconnect

This command disconnects the modem from a call upon receiving a long-space signal from the distant end. This
command is only valid in 1200 bits/s and 2400 bits/s modes.

Result codes:

■ OK if n = 0—1.

■ ERROR if n

Table 19. Yn Commands

Command Function

Y0 Disables long-space disconnect (default).
Y1 Enables long-space disconnect.

Zn—Reset and Recall Stored Profile

0—1.

≠

This command will force the modem to go on-hook and restore the profile saved by the last &W command. Either
Z0 or Z1 restores the same single profile.

Result codes:

■ OK if n = 0—1.

■ ERROR if n

0—1.

≠

Table 20. Zn Commands

Command Function

Z0 Reset and restore stored profile.
Z1 Reset and restore stored profile.

&Bn—V.32 Auto Retrain

The modem always auto retrains.
Result codes:

■ OK if n = 1.

■ ERROR if n

Table 21. &Bn Commands

≠

1.

Command Function

&B0 Disable V.32 auto retrain (not supported).
&B1 Enable V.32 auto retrain (default).

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AT Command Set (continued)

&Cn—Data Carrier Detect (DCD) Control

Data carrier detect (DCD) is a signal from the modem to the computer indicating that the carrier signal is being
received from a remote modem. DCD normally turns off when the modem no longer detects the carrier signal.

Result codes:

■ OK if n = 0—1.

■ ERROR if n

0—1.

≠

Table 22. &Cn Commands

Command Function

&C0 The state of the carrier from the remote modem is ignored. DCD remains on at all times.
&C1 DCD turns on when the remote modem’s carrier signal is detected and off when the carrier signal

is not detected (default).

&Dn—Data Terminal Ready (DTR) Control

This command informs the modem how to respond to the state of the DTR signal and changes to the DTR signal.
Result codes:

■ OK if n = 0—3.

■ ERROR if n

Table 23. &Dn Commands

Command Function

&D0 Ignore the true status of DTR and treats it as always on. This should be used only if the computer

&D1 If the DTR signal is not detected while in on-line data mode, the modem enters command mode,

&D2 If the DTR signal is not detected while in on-line data mode, the modem disconnects (default).
&D3 Reset modem on the on-to-off DTR transition.

0—3.

≠

does not provide DTR to the modem.

issues the OK result code, and remains connected.

&Fn—Restore Factory Default Configuration

This command loads the configuration stored and programmed at the factory. This operation replaces all of the
command options and S-register settings in the active configuration with factory default values.

Note: In voice mode, the command line is ignored if the AT&F command is placed on the same line as the other

commands. To load factory settings in voice mode, issue the &Fn command by itself.

Result codes:

■ OK if n = 0 or 5.

■ ERROR if n ≠ 0 or 5.

Table 24. &Fn Commands

Command Function

&F0 Loads the configuration stored and programmed at the factory (default).
&F5 Loads the configuration stored and programmed at the factory for ETC mode.

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AT Command Set (continued)

&Gn—V.22bis Guard Tone Control

This command determines which guard tone, if any, should be transmitted while transmitting in the high band
(answer mode). This command is only used in V.22 and V.22bis mode. This option is not used in North America; it
is for international use only.

Result codes:

■ OK if n = 0—2.

■ ERROR if n

0—2.

≠

Table 25. &Gn Commands

Command Function

&G0 Disables guard tone (default).
&G1 Selects 550 Hz guard tone.
&G2 Selects 1800 Hz guard tone.

&Jn—Auxiliary Relay Option

Result codes:

■ OK if n = 0.

■ ERROR if n

Table 26. &Jn Commands

Command Function

&J0 The auxiliary relay is never closed (default).
&J1 Not supported.

≠

0.

&Kn—Local Flow Control Selection

This command instructs the modem on which flow control method to use.
Result codes:

■ OK if n = 0, 3, or 4.

■ ERROR if n

Table 27. &Kn Commands

Command Function

&K0 Disables flow control.

&K1, &K2 Reserved.

&K3 Enables RTS/CTS (hardware) flow control (default).
&K4 Enables XON/XOFF software flow control.

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0, 3, or 4.

≠

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AT Command Set (continued)

&Mn—Asynchronous Communications Mode

Result codes:

■ OK if n = 0.

■ ERROR if n

Table 28. &Mn Commands

Command Function

&M1, &M2, &M3, &M4 Reserved.

&Pn—Pulse Dial Make-to-Break Ratio Selection

This command is effective only for Japan.
Result codes:

0.

≠

&M0 Asynchronous mode (default).

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■ OK if n = 0—2.

■ ERROR if n

0—2.

≠

Table 29. &Pn Commands for Domestic Versions

Command Function

&P0 Selects 39%—61% make/break ratio at 10 pulses per second.
&P1 Selects 33%—67% make/break ratio at 10 pulses per second (default).
&P2 Selects 33%—67% make/break ratio at 20 pulses per second.

&Qn—Asynchronous Communications Mode

Result codes:

■ OK if n = 0, 5, 6, 8, or 9.

■ ERROR if n

Table 30. &Qn Commands

Command Function

&Q0 Asynchronous mode, buffered. Same as \N0.
&Q5 Error control mode, buffered (default). Same as \N3.
&Q6 Asynchronous mode, buffered. Same as \N0.
&Q8

&Q9 V.42 or

0, 5, 6, 8, or 9.

≠

MNP

error control mode. If an

MNP

error control protocol is not established, the modem will fall

back according to the current user setting in register S36.

MNP

error control mode. If neither error control protocol is established, the modem will

fall back according to the current user setting in register S36.

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AT Command Set (continued)

&Sn—Data Set Ready (DSR) Option

This command controls DSR action.
Result codes:

■ OK if n = 0—1.

Manual

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■ ERROR if n

0—1.

≠

Table 31. &Sn Commands

Command Function

&S0 DSR is always on (default).
&S1 DSR comes on after establishing a connection and goes off when the connection ends.

&Tn—Self-Test Commands

This command allows the user to perform diagnostic tests on the modem. These tests can help to isolate problems
when experiencing periodic data loss or random errors.

Result codes:

■ OK if n = 0.

■ CONNECT if n = 1 or 3.

■ ERROR if n

Table 32. &Tn Commands

Command Function

&T0 Abort. Terminates the test in progress.
&T1 Local analog loop. This test verifies modem operation as well as the connection between the

&T3 Local digital loopback test.

0—1 or 3.

≠

modem and computer. Any data entered at the local DTE is modulated, demodulated, and then
returned to the local DTE. To work properly, the modem must be off-line.

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AT Command Set (continued)

&Vn—View Active Configuration

This command displays the active profiles.
Result codes:

■ OK if n = 0.

■ ERROR if n

An example of the results of the command are shown below:

≠

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Option
Comm Standard Bell B

CommandCharEcho Enabled E
Speaker Volume Medium L
Speaker Control OnUntilCarrier M
Result Codes Enabled Q
Dialer Type Tone T/P
ResultCode Form Text V
ExtendResultCode Enabled X
DialToneDetect Enabled X
Busy Tone Detect Enabled X
LSD Action Standard RS232 &C
DTR Action Standard RS232 &D

Press any key to continue; ESC to quit.

Option
V22b Guard Tone Disabled &G

Flow Control Hardware &K
Error Control Mode V42, MNP, Buffer \N
Data Compression Enabled %C
AutoAnswerRing# 0 S0
AT Escape Char 43 S2
CarriageReturnChar 13 S3
Linefeed Char 10 S4
Backspace Char 8 S5
Blind Dial Pause 2 sec S6
NoAnswer Timeout 50 sec S7
"," Pause Time 2 sec S8

Press any key to continue; ESC to quit.

Selection AT Cmd

Selection AT Cmd

Option
No Carrier Disc 2000 msec S10

DTMF Dial Speed 95 msec S11
Escape GuardTime 1000 msec S12
Data Calling Tone Disabled S35
LineRate 33600 S37

Press any key to continue; ESC to quit.

Stored Phone Numbers
&Z0=
&Z1=
&Z2=

OK

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AT Command Set (continued)

&Wn—Store Current Configuration

This command stores certain command options and S-register values except S3, S4, and S5. The Zn command or
a power-up reset of the modem restores this profiles.

Note: This command is not valid during a cellular call.
Result codes:

■ OK if n = 0.

■ ERROR if n

Table 33. &Wn Commands

Command Function

&W0 Stores the current configuration as profile 0.

&Yn—Select Stored Profile for Hard Reset

≠

0.

This command does not change the behavior of the modem but is included for compatibility with applications that
issue the &Y0 command.

Result codes:

■ OK if n = 0.

■ ERROR if n

≠

0.

Table 34. &Yn Commands

Command Function

&Y0 Select stored profile 0 on power-up.

&Zn=x—Store Telephone Number

This command is used to store up to three dialing strings for later use. The format for the command is

&Zn=stored number, where n represents the location 0—2 to which the number should be written. The dial string
may contain up to 40 characters. The ATDS=n command dials using the string stored in location n.

Result codes:

■ OK if n = 0—2.

■ ERROR if n ≠ 0—2.

\An—Select Maximum

The modem will operate an

MNP

Block Size

MNP

error corrected link using a maximum block size controlled by the parameter sup-

plied.
Result codes:

■ OK if n = 0—3.

■ ERROR if n ≠ 0—3.

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AT Command Set (continued)

Table 35. \An Commands

Command Function

\A0 64 characters.
\A1 128 characters.
\A2 192 characters.
\A3 256 characters (default).

\Bn—Send Break

In nonerror correction mode, the modem will transmit a break signal to the remote modem with a length in multiples
of 100 ms according to the parameter specified. The command works in conjunction with the \K command. The
default of n = 3 corresponds to a length of 300 ms.

Result codes:

■ OK if connected in data modem mode.

■ NO CARRIER if not connected or if connected in FAX modem mode.

■ ERROR if n

1—9.

≠

Table 36. \Bn Commands

Command Function

\B1—\B9 Break length in 100 ms units (nonerror-control mode only).

\Gn—Modem Por t Flow Control

Result codes:

■ OK if n = 0—1.

■ ERROR if n

≠

0—1.

Table 37. \Gn Commands

Command Function

\G0 The modem processes XON/XOFF flow control characters locally (default).
\G1 The modem passes XON/XOFF flow control characters.

\Jn—Adjust Bits/s Rate Control

This command determines whether or not the negotiated connect speed of the modem forces the adjustment of

the speed of the DTE to the modem’s speed.
Result codes:

■ OK if n = 0—1.

■ ERROR if n ≠ 0—1.

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AT Command Set (continued)

Table 38. \Jn Commands

Command Function

\J0 Buffer mode. Error control is set or disabled with the \Nn command (default).
\J1 Forces the maximum DCE rate to the DTE rate.

\Kn—Set Break Control

This command controls the response of the modem to a break received from the DTE, remote modem, or the \Bn
command.

Result codes:

■ OK if n = 0—5.

■ ERROR if n ≠ 0—5.

The response is different in three separate cases. The first case is where the modem receives a break from the
DTE when it is operating in data transfer mode. See Table 39.

Table 39. \Kn Commands When Modem Is Operating in Data Transfer Mode

Command Function

\K0, \K2, K4 Enter on-line command mode. No break is sent to the remote modem.

\K1 Clear data buffers and send a break to the remote modem.
\K3 Send a break to the remote modem immediately.
\K5 Send a nondestructive, nonexpedited break to the remote modem (default).

The second case, shown in Table 40, occurs when the modem is in the on-line command state (waiting for AT com­mands) during a data connection, and the \Bn command is received in order to send a break to the remote modem.

Table 40. \Kn Commands When Modem Is On-Line Command State During Data Connection

Command Function

\K0, \K1 Clear data buffers and send a break to the remote modem.
\K2, \K3 Send a break to the remote modem immediately.
\K4, \K5 Send a break to the remote modem in sequence with data (default).

Finally, the third case occurs when a break is received from a remote modem during a connection. These com­mands are shown in Table 41.

Table 41. \Kn Commands When Break Is Received During Connection

Command Function

\K0, \K1 Clear data buffers and send a break to the DTE.
\K2, \K3 Send a break to the DTE immediately.
\K4, \K5 Send a break to the DTE in sequence with received data (default).

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AT Command Set (continued)

\Nn—Select Error Control Mode

This command determines the type of error control used by the modem when sending or receiving data.
Result codes:

■ OK if n = 0—5, or 7.

■ ERROR if n ≠ 0—5, or 7.

Table 42. \Nn Commands

Command Function

\N0 Buffer mode. No error control (same as &Q6).
\N1 Direct mode.
\N2

\N3 V.42, MNP, or buffered (default). The modem attempts to connect in V.42 error control mode. If

\N4 V.42 or disconnect. The modem attempts to connect in V.42 error control mode. If this fails, the

\N5 V.42,
\N7 V.42,

MNP

or disconnect mode. The modem attempts to connect using

dures. If this fails, the modem disconnects. This is also known as

MNP

this fails, it will attempt to connect in
mode and continues operation. This is also known as V.42/

mode. If this also fails, the modem connects in buffer

MNP

&Q5).

modem disconnects.

MNP

, or buffered (same as \N3).

MNP

, or buffered (same as \N3).

MNP

2—4 error control proce-

MNP

reliable mode.

auto reliable mode (same as

\Qn—Local Flow Control Selection

Result codes:

■ OK if n = 0—1, or 3.

■ ERROR if n

0—1, or 3.

≠

Table 43. \Qn Commands

Command Function

\Q0 Disable flow control (same as &K0).
\Q1 XON/XOFF software flow control (same as &K4).
\Q2 CTS-only flow control. This is not supported and the response is ERROR.
\Q3 RTS/CTS to DTE (same as &K3) (default).

\Rn—Ring Indicator Signal Off After Answer

Result codes:

■ OK if n = 0.

■ ERROR if n ≠ 0.

Table 44. \Rn Commands

Command Function

\R0 Ring indicator signal is off after the telephone call is answered.

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AT Command Set (continued)

\Tn—Inactivity Timer

This command specifies the length of time in minutes that the modem will wait before disconnecting when no data
is sent or received. A setting of n = 0 disables the timer. Alternatively, this timer may be specified in register S30.
This function is only applicable in buffer mode.

Result codes:

■ OK if n = 0—255.

■ ERROR if n

0—255.

≠

Table 45. \Tn Commands

Command Function

\T0 Inactivit y timer disabled (default).

\T1—\T255 Specifies the length of time in minutes that the modem will wait before disconnecting when no

data is sent or received.

\Vn—Protocol R e sult Code

Result codes:

■ OK if n = 0—2.

■ ERROR if n

Table 46. \Vn Commands

Command Function

\V0 Disables protocol result code appended to DCE speed.
\V1 Enables protocol result code appended to DCE speed (default).
\V2 Enables protocol result code appended to DCE speed (same as \V1).

0—2.

≠

\Xn—XON/XOFF Pass Through

Result codes:

■ OK if n = 0—1.

■ ERROR if n

0—1.

≠

Table 47. \Xn Commands

Command Function

\X0 The modem processes XON/XOFF flow control characters locally (default).
\X1 The modem passes XON/XOFF flow control characters.

%B—View Numbers in Blacklist

If blacklisting is in effect, this command displays the number of the last failed call, attempted in the past two hours.
The modem returns an ERROR result code if your country does not support blacklisting.

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AT Command Set (continued)

%Cn—Data Compression Control

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This command determines the operation of V.42bis and

MNP

class 5 data compression. On-line changes do not

take effect until a disconnect occurs.
Result codes:

■ OK if n = 0—1.

■ ERROR if n

0—1.

≠

Table 48. %Cn Commands

Command Function

%C0 V.42bis/
%C1 V.42bis/

MNP

5 disabled. No data compression.

MNP

5 enabled. Data compression enabled (default).

%En—Auto F allback/Fallforward Control

This command provides the option for the modem to automatically monitor line quality in order to fall back when
line quality is insufficient and to fall forward when line quality is sufficient.

Result codes:

■ OK if n = 0—2.

■ ERROR if n

Table 49. %En Commands

0—2.

≠

Command Function

%E0 Disable fallback/fallforward.
%E1 Enable fallback and disable fallforward.
%E2 Enable fallback/fallforward (default).

)Cn—Enable Direct Connect

This command enables direct connect operation. After a phone is enabled, the modem will operate in cellular mode

ETC

whenever the phone is detected. Otherwise, it will automatically switch to landline.
operating in cellular mode.

Result codes:

■ OK if n = 0—3.

■ ERROR if n ≠ 0—3.

Table 50. -Cn Commands

Command Function

)C0 Select landline.
)C1 Select OKI/AT&T type phones.
)C2 Select Motorola phones.
)C3 Select NEC type phones.

is automatically set when

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Test and Debug AT Commands

The following commands are to be used for testing and debugging only. They are not meant for general use.

&&C—Write to/Read from DSP Register

AT&&C<loc>,<val> writes the value <val> to the DSP register at location <loc>. AT&&C<loc> reads location <loc>.

&&L—Line-to-Line Loopback

This command provides a loopback for line-to-line.

&&R—Write to/Read from DSP RAM Location

AT&&R<loc>,<v al> writes the value <v al> to the DSP RAM location <loc>. AT&&R<loc> reads from location <loc>.

&&S—Speaker Codec Loopback

This command provides a loopback from the microphone to the speaker.

%T88—Write to NVRAM

AT%T88,<loc>,<val> writes the value <val> to NVRAM location <loc>.

%T89—Read from NVRAM

AT%T89,<loc> reads NVRAM from location <loc>.

%T112,n—Debug Enable/Disable

Result codes:

■ OK if n = 0—1.

■ ERROR if n

Table 51. \Tn Commands

Command Function

%T112,1 Tur n debug on.
%T112,0 Tur n debug off.

0—1.

≠

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