FAX/DATA MODEM
USER'S MANUAL
Table of Contens
i - FCC/DOC REQUIREMENTS
i.1 FCC General Information
i.2 FCC Notice
i.3 DOC Notice
1 - INTRODUCTION
2 - COMMAND REFERENCE
2.1 General Command Information
2.2 AT Commands
2.2.a Commands Preceded by &
2.2.b Commands Preceded by \
2.2.c Commands Preceded by %
2.2.d Commands Preceded by 2.2.e AT Commands Reference
2.2.f AT Commands for Testing and Debugging
2.3 Commands Not Preceded By AT
2.4 Result Codes
3 - S REGISTER REFERENCE
3.1 Register Summary
3.2 Glossary of the S Registers
4 - TROUBLESHOOTING GUIDE
5 - APPLICATION EXAMPLES
5.1 Dialing a Remote Modem
5.2 Dial a Stored Number
5.3 Manual Answer an Incoming Call
5.4 Auto Answer an Incoming Call
5.5 Voice to Data Switching
A - TECHNICAL SPECIFICATIONS
B - QUICK REFERENCE
C - HINTS FOR FAX SOFTWARE INSTALLATION
D - GLOSSARY
E - ASCII CODE TABLE
i - FCC/DOC REQUIREMENTS
i.1 FCC General Information
The Federal Communications Commission (FCC) of the United States restricts specific uses of modems,
and places registration responsibilities on both the manufacturer and the individual user:
1. The modem may not be connected to a party line or to a coin operated telephone.
2. The modem manufacturer must make any repairs to the modem to maintain valid FCC registration.
3. Notification to the telephone company is no longer required prior to connecting registered
equipment, but upon request from the telephone company, the user shall tell the telephone company
which line the equipment is connected to as well as the registration number and ringer equivalence
number of the registered protective circuitry. FCC information is printed on a label on the bottom of
the modem.
i.2 FCC Notice
This equipment has been tested and found to comply with the limits for a digital device, pursuant to
Subpart B of Part 15 of the FCC rules. These limits are designed to provide reasonable protection against
harmful interference in a residential installation. This equipment generates and uses radio frequency
energy and if not installed and used the instructions, may cause interference to radio communications.
However, there is no guarantee that interference will not occur in a particular installation. If this
equipment does cause harmful interference to radio or television reception, which can be determined by
turning the equipment off and on, the user is encouraged to try and correct the interference by one or more
of the following measures:
Reorient or relocate the receiving antenna.
Increase the separation between the equipment and receiver.
Connect the equipment into an outlet on a curcuit different from that to which the receiver is
connected.
Consult the dealer or an experienced radio/TV technician for help.
Shielded interconnect cables and a shielded power cord must be employed with this equipment to insure
compliance with the pertinent RF emission limits governing this device. Changes or modifications not
expressly approved by the manufacturer could void the user's authority to operate this equipment.
NOTE : The manufacturer is not responsible for any radio or T.V. interference caused by
unauthorized modifications to this equipment. Such modifications could void the
user's authority to operate the equipment.
i.3 DOC Notice
Notice: The Canadian Department of Communications label identifies certified equipment. This
certification means that the equipment meets certain telecommunications network protective, operational
and safety requirements. The Department does not guarantee the equipment will operate to the user's
satisfaction.
Before installing this equipment, users should ensure that it is permissible to be connected to the facilities
of the local telecommunications company. The equipment must also be installed using an acceptable
method of connection. In some cases, the company's inside wiring associated with a single line individual
service may be extended by means of a certified connector assembly (telephone extension cord). The
customer should be aware that compliance with the above conditions may not prevent degradation of
service in some situations.
Repairs to certified equipment should be made by an authorized Canadian maintenance facility designated
by the supplier. Any repairs or alterations made by the user to this equipment, or equipment malfunctions,
may give the telecommunications company cause to request the user to disconnect the equipment.
Users should ensure for their own protection that the electrical ground connections of the power utility,
telephone lines and internal metallic water pipe system, if present, are connected together. This precaution
may be particularly important in rural areas.
Caution: Users should not attempt to make such connections themselves, but should contact the
appropriate electric inspection authority, or electrician, as appropriate.
The Load Number (LN) assigned to each terminal device denotes the percentage or the total load to be
connected to a telephone loop which is used by the device, to prevent overloading. The termination on a
loop may consist of any combination of devices subject only to the requirement that the total of the Load
Numbers of all the devices does not exceed 100.
Locate an analog telephone line. Many offices have digital telephone lines, which will not work with a
modem.
Warning: Do not connect your modem to a digital telephone line. Modems are designed for use only with
analog telephone lines; connecting to a digital telephone line may damage the modem. Verify that the line
is analog before connecting.
Fax machines use analog telephone lines. If you can't find an analog voice line, find a fax machine and
use its line.
1 - INTRODUCTION
Congratulations on your purchase of this outstanding Fax/Data Modem. This manual describes how to
operate your new Fax/Data Modem.
Instructions for installing your Fax/Data Modem will be found in the Installation Manual, while the
information in this manual, deals exclusively with the operation of the modem after it is installed, such as
the command set, the internal configuration registers, troubleshooting and testing.
Features :
These Fax/Data Modems combine the features of a 56000/33600/31200/28800 bps data modem and a
14400/9600 bps FAX modem. Your new Fax/Data Modem gives your personal computer the ability to
send and receive FAX messages over the telephone line like a standard FAX machine. Your Fax/Data
Modem also allows your PC to communicate with other personal computers, terminals or BBS's (Bulletin
Board Systems) through the data modem functions.
When used as a data modem your Fax/Data Modem uses the standard AT command set and is fully
compatible with K56 Flex/V.90, ITU-T V.42, V.42bis, V.34 ANNEX 12, V.34, V.32bis, V.32, V.22bis,
V.23, V.22, V.21, MNP 2-5, Bell 103, 212A and AT&T V.32terbo. When used as a Fax/Data Modem it
communicates with all ITU-T Group 3 FAX machines and is compatible with ITU-T V.27ter and V.29,
V.17, T.4 and T.30. Switching between DATA mode operation and FAX mode operation of your
Fax/Data Modem is done through its firmware, no hardware settings are required.
If you are already familiar with the use of a modem and the Hayes AT command set, this modem will be
extremely easy for you to use. Just read the installation procedures in the installation manual and you are
ready to begin operation. If you are new to modem communications, we recommend that you read through
this manual first. If you come across terms that you don't understand, consult the glossary. Words in
boldface type are command names, commands, or default settings. Carriage returns (Enter) are noted
with <CR> or [ENTER]; this does not mean to enter these characters literally; but instead to press the
Enter key.
If you are going to call a FAX machine then you must use the Fax software. If the machine that you are
going to communicate with is a modem then you must use a data modem communications software.
This manual is written to be used for several models of Fax/Data Modems. Some of the information in this
manual may not apply to your fax/data modem.
2 - COMMAND REFERENCE
This chapter provides an alphabetized reference with examples for all commands for the modem. The
system of commands is depicted below in Figure 2 - 1.
To use these commands for dialing or configuring the modem, make sure the communications software
package you will be using lets you operate the modem through its interna1 commands. If your software
permits use of the modem's internal commands, read this chapter. If not, read your software user's
manual and ignore the rest of this manual.
2.1 General Command Information
Except for the A/ command and the + + + escape command described in Section 2.3, all commands must
be prefixed with the attention code AT. For instance, the A command (below) would be entered as: "AT
A <CR>". Without the AT prefix, the command line cannot be executed. Once entered, AT cannot be
deleted with the Backspace or Delete keys.
More than one command can be placed on a single line and, if desired, separated with spaces for
readability. Once the carriage return (Enter) key is pressed, the command line is executed. A line with no
carriage return is ignored.
The modem accepts either upper or lower case characters in the command line and ignores any spaces
within or between commands. Typing errors can be corrected with the Backspace key. Exceptions are
noted in the description of specific commands.
Variables (r and x) are listed in italics. Punctuation symbols (, ; ! @) use as dial modifiers are listed
alphabetically according to their English names at the Dn command. Where two commands are separated
by a slash, either command will have the same effect. For example, if the command is listed as B0/B,
issuing either B0 or B will have the same effect.
2.2 AT Commands
A
Go On-line in Answer Mode
This command instructs the modem to go off-hook immediately and then make a handshake with the
remote modem. Handshaking is not available during leased line operation.
A is usually used to manually answer an incoming call.
Bn
Communication Standard Setting
This command determines ITU-T vs. Bell standard.
B0
Selects ITU-T 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
Unselects V.23 reverse channel (same as B3).
B3
Unselects 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)
Cn
Carrier Control Option(dummy command)
This command is used by some modems to control the transmit carrier. This modem does not support C0
and will respond in error if this command is given. This modem will accept C1 without error in order to
ensure backward compatibility with communications software that issues this command.
C0
Transmit carrier always off (returns ERROR).
C1
Normal transmit carrier switching. (default)
Dn
Dial
This command instructs the modem to begin the dialing sequence. The dial string (n, including modifiers
and the telephone number) is entered after ATD command.
A dial string can be up to 40 characters long. Any digit or symbol (0-9, *, #, A, B, C, D) may be dialed as
touchtone digits. Characters such as spaces, hyphens, and parentheses do not count - they are ignored by
the modem and may be included in the dial string to enhance readability.
The following may be used as dial string modifiers:
L
Redials last number. Should be the first character following ATD, ignored otherwise.
P
Pulse dial.
T
Touch-tone dialing. (default)
,
Pause during dialing. Pause for time specified in Register S8 before processing the next
character in the dial string.
W
Wait for dial tone. Modem waits for a second dial tone before processing the dial string.
V
The modem switches to speakerphone and dials the number. An ATH command may be
used to disconnect the voice call.
@
Wait for quiet answer. Wait for five seconds of silence after dialing the number. If silence is
not detected, the modem sends a NO ANSWER result code back to the user.
!
Hook flash. Causes the modem to go on-hook for 0.5 seconds and then return to off-hook.
;
Return to command mode. Causes the modem to return to command mode after dialing the
number, without disconnecting the call.
^
Disable data calling tone transmission.
S=n
Dial a telephone number previously stored using the &Zn=x command (see the &Zn=x
command for further information). The range on n is 0-3.
$
Bong tone detection.
En
AT Command Echo Options
This command determines whether characters are echoed to the DTE from the modem when it is in
command state.
Fn
E0
Echo disabled.
E1
Echo enabled. (default)
On-Line Echo Command(dummy command)
This command is used by some modems to determine whether characters are echoed to the DTE from the
modem when it is in the on-line state. This modem does not support F0 and will respond in error if this
command is given. This modem will accept F1 without error in order to ensure backward compatibility
with communications software that issues this command.
Hn
F0
Returns ERROR.
F1
On-line echo disabled. (default)
Switchhook Control
This command provides control over the line relay.
In
H0
Modem goes on-hook.
H1
Modem goes off-hook, but will not train. (default)
Request ID Information
This command displays specific product information about the modem.
I0
Returns default speed and controller firmware version. (same as I3)
I1
Calculates ROM checksum and dislpays it on the DTE (e.g., 12AB).
I2
Performs a ROM check and calculates and verifies the checksum displaying OK or
ERROR.
Ln
I3
Returns the default speed and the controller firmware version. (same as I0)
I4
Returns firmware version for data pump (e.g., 94).
I5
Returns the board ID: software version, hardware version, and country ID.
I9
Returns country code (e.g., NA Ver. 1).
Speaker Volume
This command determines the volume level of the speaker, when supported by the modem.
L0
Lowest speaker volume.
L1
Low speaker volume.
Mn
L2
Medium speaker volume. (default)
L3
High speaker volume.
Speaker Control
This command determines whether the speaker function of the modem is on or off.
Nn
M0
Speaker always off.
M1
Speaker on until carrier present. (default)
M2
Speaker always on.
M3
Speaker off during dialing and on until carrier.
Select Negotiate Handshake
This command controls automode enable/disable.
N0
When originating or answering, handshake only at the communication rate specified by S
register 37 and Bn and no fallback.
N1
When originating or answering, start handshake only at the communication standard
specified by S register 37 and Bn. During handshake, fallback to a lower speed may
occur except in \N1 mode. (default)
On
Return On-line to Data Mode
O0
Instructs the modem to exit on-line command mode and retuen to data mode (see AT
Escape Sequence, +++).
P
O1
This command issues a retrain before returning to on-line data mode.
O3
This command issues a rate renegotiation before returning to on-line data mode.
Enable Pulse Dialing
This command instructs the modem to use pulse dialing. Dialed digits will be pulsed dialed until a T
command or dial modifier is received. Tone dial is the default setting.
Qn
Results Code Display Option
This command controls whether the result codes are displayed to the DTE.
T
Q0
Result codes enabled. (default)
Q1
Result codes disabled.
Enable Tone Dialing
This command instructs the modem to send DTMF tones while dialing. Dialed digits will be tone dialed
until a P command or dial modifier is received. This is the default setting.
Vn
Result Code Form
This command determines whether result codes (including call progress and negotiation progress
messages) are displayed as numbers or words.
Wn
V0
Numeric form. (0 for OK)
V1
Verbose form. (0 for OK)(default)
Select Extended Result Codes
This command determines which result codes will be used to describe the type of connection and protocol
that resulted from handshaking and negotiation.
W0
CONNECT result code reports DTE speed. (default)
W1
CONNECT result code reports DTE speed; enable the CARRIER, COMPRESSION and
PROTOCOL extended result code.
W2
Xn
CONNECT result code reports DCE speed.
Result Code Selection and Call Progress Monitoring
This command enables tone detection options used in the dialing proces. As these functions are chosen,
the modem chip set's result codes are also affected. Therefore, this command is frequently used to control
the modem chip set's responses. The primary function of this control is to control the modem chip set's
call response capabilities.
Ext. Result Code
Disable
Enable
Enable
Enable
Enable
Enable
Enable
Disable
X0
X1
X2
X3
X4
X5
X6
X7
Yn
Dial Tone Detect
Disable
Disable
Enable
Disable
Enable
Enable
Enable
Enable
Busy Tone Detect
Disable
Disable
Disable
Enable
Enable(default)
Enable
Enable
Enable
Long Space Disconnect
Long space disconnect is always disabled.
Zn
Y0
Disable long space disconnect. (default)
Y1
Enable long space disconnect. NOT SUPPORTED.
Recall Stored Profile
This command instructs the modem chip set to go on hook and restore the selected stored profile. Any
nonstorable parameters previously set are returned to their factory settings.
Z0
Reset and recall user profile 0.
Z1
Reset and recall user profile 1. (default)
2.2.a Commands Preceded by &
&Bn
V.32 Auto Retrain
This modem always auto retrains.
&Cn
&B0
Disable V.32 auto retrain - NOT SUPPORTED.
&B1
Enable V.32 auto retrain. (default)
Data Carrier Detect Option (Async only)
This command controls how the state of the DCD or RLSD (receive line signal detect) relates to the
carrier from the remote modem. Always use &C1 for Sync mode.
&C0
State of carrier from remote modem is ignored. RLSD circuit is always on.
&C1
State of carrier from remote modem is tracked. RLSD circuit reflects the state of
carrier. (default)
&Dn
Data Terminal Ready Option
This command interprets how the modem will respond to the state of the DTR signal and changes to the
DTR signal. This is for &M0 only.
&D0
DTR ignored.
&D1
Go to command mode on on-to-off DTR transition.
&D2
Hang up and go to command mode on on-to-off DTR transition. Autoanswer is disabled if
DTR is low. (default)
&D3
&Fn
Reset on on-to-off DTR transition.
Load Factory Settings
This command loads the configuration stored and programmed at the factory. This operation replaces all
of the command options and the S-register settings in the active configuration with factory values.
Note: When this command is placed on the command line at the same time as another AT command, the
function of the command is ignored. To load the factory settings, this command must be issued by itself.
&F0
Recall factory setting as active configuration.
&F5
Recall factory settings appropriate for ETC mode as active configuration. This command
enables ETC operation. It is automatically set upon detection of the cellular phone, enable
the )Cn command. The following options are set with &F5:
Function
LAPM only error correction
Maximum block size=64
Modulation=V.32bis
Transmit Level fixed per cell phone
Wait for Carrier=90 sec
MTC Implementation
\N4
S28=0
S92
S7=90
by
CD loss delay=10 sec
Auto FF/FB enabled
Startup at 9600
Selects V.22 when applicable
&Gn
S10=100
N/A
S40=2
B1
Guard Tone Option
This command determines which guard tone, if any, to transmit while transmitting in the high band
(answer mode). This command is only used in V.22 and V.22bis mode.
&Jn
&Kn
&G0
No guard tones. (default)
&G1
550 Hz guard tone.
&G2
1800 Hz guard tone.
Auxiliary Relay Option
&J0
The auxiliary relay is never closed.
&J1
NOT SUPPORTED, responds ERROR.
Select Flow Control
This command selects the flow control method the modem chip set provides to the DTE to prevent the
modem's buffer from overflowing with data. A data buffer holds the data until the modem is ready to
transmit it. When the data buffer is full, flow control instructs the DTE to stop sending to the modem
while the modem continues to send characters.
&Mn
&Pn
&K0
Disable flow control.
&K1
Reserved.
&K2
Reserved.
&K3
Enable bi-directional hardware flow control (RTS/CTS). (default)
&K4
Enable bi-directional XON/XOFF flow control.
&K5
Error.
Asynchronous Communications Mode
&M0
Asynchronous Mode. (default)
&M1
Reserved.
&M2
Reserved.
&M3
Reserved.
&M4
Reserved.
Pulse Dial Make-to-Break Ratio Selection
This command is effective only for Japan.
&P0
33/66 make/break ratio. (default)
&P1
&Qn
17/33 make/break ratio (20 pps).
Asynchronou Communications Mode
&Q0
Asynchronous Mode, buffered. Same as \N0.
&Q1
Reserved.
&Q2
Reserved.
&Q3
Reserved.
&Q4
Reserved.
&Q5
Error Control Mode, buffered. Same as \N3. (default)
&Q6
Asynchronous Mode, buffered. Same as \N0.
&Q7
Reserved.
&Q8
MNP error control mode. If an MNP error control protocol is not established, the modem will
fallback according to the current user setting in S36.
&Q9
V.42 or MNP error control mode. If neither error control protocol is established, the modem
will fallback according to the current user setting in S36.
&Sn
Data Set Ready Option
This command controls the functions of DSR. DSR indicates when the modem is connected to a
communications channel and is ready. Async mode only. If the modem is in Sync mode, DSR is on
during handshake and on-line, off in test or idle mode.
&S0
DSR circuit always on. (default)
&S1
DSR circuit on during handshaking and on-line, off in test modes or in idle mode.
Result Codes:
OK
n=0, 1
&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.
&T0
Abort. Stops any test in progress.
&T1
Local analog loop. This test verifies modem operation, as well as the connection between
the modem and computer. Any data entered at the local DTE is modulated, then
demodulated,
and returned to the local DTE. To work properly, the modem must be off-line.
&T3
Local digital loopback test.
&T6
Remote digital loopback test. This test can verify the integrity of the local modem, the
communications link, and the remote modem. Any data entered at the local DTE is sent to,
and
returned from, the remote modem. To work properly, the modems must be on-line with
error control
disabled.
&Vn
View Active Configuration and Stored Profile
This command is used to display the active profiles.
&V0
&Wn
View active file.
Store Current Configuration
This command stores certain command options and S-register values into the modem's nonvolatile
memory. The ATZ command or a power-up reset of the modem restores this profile.
Result Codes:
OK
n=0
&Yn
Select Stored Profile for Hard Reset
This command does not change the behavior of the modem but is included for compatibility with
applications that issue the &Y0 command.
&Y0
Select stored profile 0 on power-on.
&Y1
ERROR.
&Zn=x
Store telephone Number
This command is used to store up to four dialing strings in the modem's nonvolatile memory for later
dialing. The format for the command is &Zn="stored number" where n is the location 0-3 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
n=0, 1, 2, 3
ERROR Otherwise
2.2b Commands Preceded by \
\Gn
\Jn
Modem Port Flow Control
\G0
Returns an "OK" for compatibility. (default)
\G1
NOT SUPPORTED, responds ERROR.
Adjust Bits/s/ Rate Control
When this feature is enabled, the modem emulates the behavior of modems that force the DTE
interface to the line speed.
\Kn
\J0
Turn off feature. (default)
\J1
Turn on feature.
Set Break Control
This command determines how the modem processes a Break signal received from the local DTE
during a connection (online).
\K0
Reserved, returns ERROR.
\K1
Reserved, returns ERROR.
\K2
Reserved, returns ERROR.
\K3
Reserved, returns ERROR.
\K4
Reserved, returns ERROR.
\K5
Modem sends the break to the remote modem in sequence with transmitted data,
non-destructive/non-expedited. (default)
\Nn
Error Control Mode Selection
This command determines the type of error control used by the modem when sending or receiving
data.
\N0
Buffer mode. No error control (same as &Q6).
\N1
Direct mode.
\N2
MNP or disconnect mode. The modem attempts to connect using MNP 2-4 error control
procedures. If this fails, the modem disconnects. this is also known as MNP reliable mode.
\N3
V.42, MNP, or buffer. The modem attempts to connect in V.42 error control mode. If
this fails, the modem attempts to connect in MNP mode. If this fails, the modem
connects in buffer mode and continues operation. This is also known as V.42/MNP
reliable mode (same as &Q5). (default)
auto
\N4
V.42 or disconnect. The modem attempts to connect in V.42 error control mode. If this fails,
the call will be disconnected.
\Qn
\Tn
\N5
V.42 MNP or buffer (same as \N3).
\N7
V.42 MNP or buffer (same as \N3).
Local Flow Control Selection
\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)
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 zero disables the timer. Alternatively, this
timer may be specified in register S30. This function is only applicable to buffer mode.
Result Codes:
OK
n=0-255
ERROR Otherwise
\Vn
\Xn
Protocol Result Code
\V0
Disable protocol result code appended to DCE speed.
\V1
Enable protocol result code appended to DCE speed. (default)
XON/XOFF Pass Through
\X0
Modem processes XON/XOFF flow control characters locally. (default)
\X1
NOT SUPPORTED, responds ERROR.
2.2.c
Commands Preceded by %
%B
View Numbers in Blacklist
If blacklisting is in effect, this command displays the numbers for which the last call attempted in the
past two hours failed. The ERROR result code appears in countries that do not require blacklisting.
%Cn
Data Compression Control
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 first.
%C0
V.42bis/MNP 5 disabled. No data compression.
%C1
V.42bis/MNP 5 enabled. Data compression enabled. (default)
2.2.d
Commands Preceded by -
-Cn
Data Calling Tone
Data Calling Tone is a tone of certain frequency and cadence as specified in V.25 which allows
remote Data/FAX/Voice discrimination. The frequency is 1300 Hz with a cadence of 0.5 s on and 2 s
off.
-C0
-C1
2.2.e
Disabled. (default)
Enabled.
AT Commands Reference
+ES=6 Enable Synchronous Buffered Mode
The synchronous buffered data mode allows an H.324 vedio application direct access to the
synchronous data channel. On underflow, the modem sends HDLC flag idle (0x7E) to the remote
modem. This special error control mode is overridden by any of the following commands: &F, &M,
&Q, and \N.
Result Codes:
OK
+ES=6
+ES:6
+ES? or +ES=? shpws the only allowed value.
ERROR Otherwise
2.2.f
AT Commands for Testing and Debugging
The following commands are to be used for testing and debugging only and are not meant for general
use.
&&C
&&L
Write to/Read from Host Interface
AT&&C<loc>, <val>
writes the value <val> to host interface at
location <loc>.
AT&&C<loc>
reads from location <loc>.
Line-to-Line Loopback
This command provides a loopback for line-to-line.
&&R
&&S
Write to/Read from DSP RAM Location
AT&&R<loc>, <val>
writes the value <val> to DSP RAM at
location <loc>.
AT&&R<loc>
reads from location <loc>.
Speaker Codec Loopback(This command has no effect on PCMCIA)
This command provides a loopback from the microphone to the speaker.
2.3 Commands Not Preceded by AT
Two commands, A/ and +++, are neither preceded by the attention code AT nor followed by a carriage
return.
A/
Repeat Command
A/ repeats the execution of the last command line stored in the command buffer. If the last command line
is invalid, the ERROR result code will appear on the screen. Note that A/ cannot be preceded by AT; if it
is, ERROR will appear on the screen.
+++
Escape
+++ followed by AT<CR> returns to the on-line command state (command state without breaking the
established connection) from the on-line state.
To escape, stop transmitting data, wait at least one escape guard time (the default time is one second), and
then enter three consecutive escape characters (the default character is +) followed by AT<CR>. After one
more escape guard time (one second), the modem returns to the command state and sends the OK result
code to the screen. Note that the escape command is the only command that can be recognized by the
modem in the on-line state; it cannot be recognized in the command state.
2.4 Results Code
The modem sends a response to the user via the screen after a command is issued. As shown in the figure
below, there are two forms for each result code: verbose code and digital code.
Numeric Verbose Description
0
OK
Command executed.
1
CONNECT
Connection at any speed if X0 selected; otherwise, connection at 0-300bits/s.
2
RING
Ring signal detected.
3
NO CARRIER
Carrier signal not detected or lost.
4
ERROR
Invalid command, checksum, error in command line, or command line too long.
5
CONNECT 1200
Connection at 1200bits/s. Disabled by X0.
6
NO DIALTONE
No dial tone detected. Enabled by X2, X4, or W dial modifier.
7
BUSY
Busy detected. Enabled by X3 or X4.
8
NO ANSWER
No silence detected when dialing a system not providing a dial tone. Enabled by @
dial modifier.
10
CONNECT 2400
Connection at 2400 bits/s.
11
CONNECT 4800
Connection at 4800 bits/s.
12
CONNECT 9600
Connection at 9600 bits/s.
13
CONNECT 14400 Connection at 14400 bits/s.
14
CONNECT 19200 Connection at 19200 bits/s. Enabled by W0.
15
CONNECT 16800 Connection at 16800 bits/s.
18
CONNECT 57600 Connection at 57600 bits/s. Enabled by W0.
24
CONNECT 7200
Connection at 7200 bits/s.
25
CONNECT 12000 Connection at 12000 bits/s.
26
CONNECT 1200/75 Connection at 1200 bits/s/75 bits/s(V.23).
27
CONNECT 75/1200 Connection at 75 bits/s/1200 bits/s(V.23).
28
CONNECT 38400 Connection at 38400 bits/s.
29
CONNECT 21600 Connection at 21600 bits/s.
30
CONNECT 24000 Connection at 24000 bits/s.
31
CONNECT 26400 Connection at 26400 bits/s.
32
CONNECT 28800 Connection at 28800 bits/s.
33
CONNECT 115200 Connection at 115200 bits/s.
34
CONNECT 31200 Connection at 31200 bits/s.
35
CONNECT 33600 Connection at 33600 bits/s.
40
CARRIER 300
Carrier detected at 300 bits/s.
42
CARRIER 75/1200 Carrier detected at 75 bits/s/1200 bits/s.
43
CARRIER 1200/75 Carrier detected at 1200 bits/s/75 bits/s.
46
CARRIER 1200
Carrier detected at 1200 bits/s.
47
CARRIER 2400
Carrier detected at 2400 bits/s.
48
CARRIER 4800
Carrier detected at 4800 bits/s.
49
CARRIER 7200
Carrier detected at 7200 bits/s.
50
CARRIER 9600
Carrier detected at 9600 bits/s.
51
CARRIER 12000
Carrier detected at 12000 bits/s.
52
CARRIER 14400
Carrier detected at 14400 bits/s.
53
CARRIER 16800
Carrier detected at 16800 bits/s.
54
CARRIER 19200
Carrier detected at 19200 bits/s.
55
CARRIER 21600
Carrier detected at 21600 bits/s.
56
CARRIER 24000
Carrier detected at 24000 bits/s.
57
CARRIER 26400
Carrier detected at 26400 bits/s.
58
CARRIER 2880
Carrier detected at 28800 bits/s.
59
CARRIER 31200
Carrier detected at 31200 bits/s.
60
CARRIER 33600
Carrier detected at 33600 bits/s.
66
COMPRESSION: MNP compression negotiated.
MNP 5
67
COMPRESSION: V.42bis compression negotiatied.
V.42BIS
69
COMPRESSION: No compression negotiatied.
70
77
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
NONE
PROTOCOL: NONE
Asynchrous mode.
PROTOCOL:
V.42 LAPM.
LAPM
PROTOCOL: MNP MNP negotiatied.
PROTOCOL:
MNP Class 2 negotiated.
MNP 2
PROTOCOL:
MNP Class 3 negotiated.
MNP 3
PROTOCOL:
MNP Class 2 and 4 negotiated.
MNP 2, 4
PROTOCOL:
MNP Class 3 and 4 negotiated.
MNP 3, 4
CARRIER 29333
Carrier detected at 29333 bits/s.(V.90)
CARRIER 30666
Carrier detected at 30666 bits/s.(V.90)
CARRIER 32000
Carrier detected at 32000 bits/s.(K56 flex or V.90)
CARRIER 33333
Carrier detected at 33333 bits/s.(V.90)
CARRIER 34000
Carrier detected at 34000 bits/s.(K56 flex)
CARRIER 34666
Carrier detected at 34666 bits/s.(V.90)
CARRIER 36000
Carrier detected at 36000 bits/s.(K56 flex or V.90)
CARRIER 37333
Carrier detected at 37333 bits/s.(V.90)
CARRIER 38000
Carrier detected at 38000 bits/s.(K56 flex)
CARRIER 38666
Carrier detected at 38666 bits/s.(V.90)
CARRIER 40000
Carrier detected at 40000 bits/s.(K56 flex or V.90)
CARRIER 41333
Carrier detected at 41333 bits/s.(V.90)
CARRIER 42666
Carrier detected at 42666 bits/s.(V.90)
CARRIER 44000
Carrier detected at 44000 bits/s.(K56 flex or V.90)
CARRIER 45333
Carrier detected at 45333 bits/s.(V.90)
CARRIER 46000
Carrier detected at 46000 bits/s.(K56 flex)
CARRIER 46666
Carrier detected at 46666 bits/s.(V.90)
CARRIER 48000
Carrier detected at 48000 bits/s.(K56 flex or V.90)
CARRIER 50000
Carrier detected at 50000 bits/s.(K56 flex)
CARRIER 50666
Carrier detected at 50666 bits/s.(V.90)
CARRIER 52000
Carrier detected at 52000 bits/s.(K56 flex or V.90)
CARRIER 53333
Carrier detected at 53333 bits/s.(V.90)
CARRIER 54000
Carrier detected at 54000 bits/s.(K56 flex)
CARRIER 54666
Carrier detected at 54666 bits/s.(V.90)
CARRIER 56000
Carrier detected at 56000 bits/s.(K56 flex or V.90)
3 - S REGISTER REFERENCE
Your modem has status registers. These registers are memory locations inside your modem which control
your modem's operation. You usually do not have to worry about setting any register because the default
values work for most applications.
The S registers are summarized in Fig. 3-1, along with their default values. Registers denoted with an "*"
may be stored in one of the two user profiles by entering the &Wn command. One of these profiles may
be loaded at any time by using the Zn command.
The factory default values are stored in ROM and are loaded into the active configuration at power-up or
by the Zn command. In addition, the designated default profile is subsequently loaded, and may change
some of the factory default values. The designated default profile can be changed by entering the &Yn
command, where 'n' is one of the two possible user profiles. The factory defaults can be loaded at any time
by entering the &F command.
3.1 S Registers Summary
The following chart summarizes your modem's registers:
Reg.#
S0
S1
S2
S3
S4
S5
S6
S7
S8
S10
S11
S12
S28
S30
S35
S36
S37
S38
S40
S42
S43
S48
S89
S90
S91
S92
S109
Range
0-255
0-255
0-255
0-127
0-127
0-255
2-65
1-255
0-65
1-254
50-150
0-255
0-255
0-255
0-1
0-7
0-19
0-22
0-2
0-1
0-1
7, 128
0, 5-255
0-1
6-15
Unit
rings
rings
ASCII
ASCII
ASCII
ASCII
seconds
seconds
seconds
1/10 sec.
1/1000 sec.
1/50 sec.
minutes
1dB
0-2
Default
Dec
Hex
0
00h
0
00h
43
2Bh
13
0Dh
10
0Ah
8
08h
2
02h
50*
32h
2*
02h
20*
14h
95
5Fh
50
32h
1*
01h
0*
00h
0*
00h
7
07h
0
00h
1
01h
0
00h
1
01h
1
01h
7
07h
10
0Ah
0
00h
15
0Fh
20
14h
1
01h
Description
Number of Rings Before Auto-answer
Ring Count
Escape Character Code
Command Terminator (<CR> Character)
Line Feed Character
Back Space Character
Wait Time for Dialing
Wait for Carrier afterDial
Pause Time for Comma (Dial Delay)
Lost Carrier to Hang-up Delay
DTMF Tone Duration
Escape Guard Timing
V.34 Modulation Enable/Disable
Inactivity Timer
Data Calling Tone
Negotiation Fallback
Dial Line Rate
56K Downstream Rate Selection for K56 flex/V.90 Mode
ETC Startup Autorating
Auto Rate
Auto Mode
LAPM Error Control and Feature Negotiation
Timer to Control Sleep Mode
Local Phone Status
Line Transmit Level
Direct Connect Transmit Level
K56 flex/V.90 Automode Selection
Fig. 3-1 S-Register Summary
3.2 S Registers
S0
Number of Rings Before Auto Answer
S0 determines the number of rings that must be received before the modem automatically answers an
incoming call. For example, when S0=3, the modem automatically answers after the third ring. When
S0=0, the modem does not automatically answer an incoming call; it stays on-hook until the A command
is issued manually to answer the incoming call.
Range:
Default:
S1
0-255 rings
0
Ring Count
S1 automatically increments its value by one each time the modem receives a ring while in the command
state. S1 is reset to zero if no ring is detected within 8 seconds.
Range:
Default:
S2
0-255 rings
0
ASCII Value of Escape Character
S2 stores the ASCII value of the escape character. Setting register S2 to a value greater than 127 disables
the escape command and you cannot return to the command state. With escape disabled, in the on-line
state the modem cannot hang up until the power is turned off or the remote modem hangs up.
Range:
Default:
S3
0-255, ASCII decimal
43(+)
ASCII Value of Carriage Return
S3 stores the ASCII value of the carriage return character. (Pertains to asynchronous operation only.)
Range:
Default:
S4
0-127, ASCII decimal
13
ASCII Value of Line Feed Character
S4 stores the ASCII value of the line feed character, if your computer does not recognize the default as a
line feed, change the value. A value greater than 127 disables the line feed. When disabled, the line feed
character that precedes or follows a result code is canceled. (Pertains to asynchronous operation only.)
Range:
Default:
S5
0-127, ASCII decimal
10(Line Feed)
Back Space<BS> Character (user defined)
Sets the character recognized as a backspace. Pertains to Asyncronous operation only. The modem will
not recognize the backspace character if it is set to a value that is greater than 32 ASCII. This character
can be used to edit a command line. When the echo commands is enabled, the modem echoes back to the
local DTE the backspace character, an ASCII space character, and a second backspace character, this
means a total of three characters are transmitted each time the modem processes the backspace character.
Range:
Default:
S6
0-127, ASCII decimal
008(backspace)
Wait Time for Dialing
S6 controls how long the modem waits after it goes off-hook before it dials the first digit of the telephone
number. The modem always pauses for at least 2 seconds, even if S6 is set to less than two seconds. If
option X2, or X4 is in effect, this option is ignored.
Range:
Default:
S7
2-65 seconds
2
Wait for Carrier after Dial
S7 controls how long the modem waits for a carrier signal from a remote modem after originating a call
or from the calling modem after going off-hook when answering a call.
S7 also controls how long the modem waits for a one-second continuous dialtone after dialing a number
followed by the W dial modifier. If the modem detects a one-second continuous dialtone within the
specified wait time, it proceeds to dial.
Range:
Default:
S8
1-255 seconds
50
Pause Time for Comma
S8 controls how long the modem pauses when a comma "," is encountered in a dial string while executing
a dial command.
Range:
Default:
S10
0-65 seconds
2
Delay between Loss of Carrier and Hang-Up
S10 determines the delay time between the loss of a carrier from the remote modem and hang-up. This
allows for a temporary loss of carrier without causing the local modem to disconnect. When S10 is set to
255, the modem functions as if a carrier is always present.
The actual interval the modem waits before disconnecting is the value in S10.
Range:
Default:
S11
1-254 tenths of a second
20(2 seconds)
DTMF(Touch-tone) Tone Duration
S11 determines the duration and spacing of tones for Dual Tone Multifrequency (DTMF) dialing. This
value has no effect on pulse dialing.
Range:
Default:
S12
50-150 milliseconds
95
Escape Guard Time
S12 determines the escape guard time. The escape guard time is the minimum waiting time required
before and after entering the escape code (three consecutive escape characters) in the on-line state. It is
also the maximum waiting time allowed between any two consecutive escape characters. If the waiting
time before or after the escape code is shorter than the guard time, or if the waiting time between
consecutive escape characters is longer than the guard time, then the modem does not recognize the
escape command and stays on-line.
If the escape guard time is set at 0 seconds, it is impossible to return the modem to command state.
Range:
Default:
S28
0-255 1/50 of a second
50
V.34 modulation Enable/Disable
This register enables/disables V.34 modulation. 0=disabled, 1-255=enabled.
Range:
Default:
S30
0-255
1
Inactivity Timer
S30 specifies the length of time (in minutes) that the modem will wait before disconnecting when no data
is sent or received. This function is only applicable to buffer mode.
Range:
Default:
S35
0-255 (minutes)
0
Data Calling Tone
Data Calling Tone is a tone of certain frequency and cadence as specified in V.25 which allows remote
Data/FAX/Voice discrimination. The frequency is 1300 Hz with a cadence of 0.5 s on and 2 s off.
0=disabled, 1=enabled.
Range:
Default:
S36
0-1
0
Negotiation Fallback
This register specifies the action to take in the event of negotiation failure when error control is selected.
S37
S36=0, 2
S36=1, 3
S36=4, 6
S36=5, 7
Hang Up.
Fallback to an asynchronous connection.
Attempt MNP. If MNP fails, hang up.
Attempt MNP. If MNP fails, fallback to asynchronous connection.
Default:
7
Dial Line Rate
S37=0
S37=1
S37=2
S37=3
S37=4
S37=5
S37=6
S37=7
S37=8
S37=9
S37=10
S37=11
S37=12
S37=13
S37=14
Maximum modem speed.
Reserved.
1200/75 bits/s.
300 bits/s.
Reserved.
1200 bits/s.
2400 bits/s.
4800 bits/s.
7200 bits/s.
9600 bits/s.
12000 bits/s.
14400 bits/s.
16800 bits/s.
19200 bits/s.
21600 bits/s.
S38
S37=15
S37=16
S37=17
S37=18
S37=19
24000 bits/s.
26400 bits/s.
28800 bits/s.
31200 bits/s.
33600 bits/s.
Default:
0
56K Downstream Rate Selection for K56 flex/V.90 Mode (default 1)
There are at S109=1 K56 flex/V.90 common operation or S109=2 V.90 only K56 flex disable.
S40
S42
S38=0
S38=1
S38=2
S38=3
S38=4
S38=5
S38=6
S38=7
S38=8
S38=9
S38=10
S38=11
S38=12
S38=13
S38=14
S38=15
S38=16
S38=17
S38=18
S38=19
S38=20
S38=21
S38=22
V.90 or K56 flex disable
V.90 or K56 flex autorate
29333bit/s
30666bit/s
32000bit/s
33333bit/s
34666bit/s
36000bit/s
37333bit/s
38666bit/s
40000bit/s
41333bit/s
42666bit/s
44000bit/s
45333bit/s
46666bit/s
48000bit/s
49333bit/s
50666bit/s
52000bit/s
53333bit/s
54666bit/s
56000bit/s
Default:
1
ETC Startup Autorating
S40=0
S40=1
S40=2
Startup with normal autorating.
Startup at initial rate of 4800 or below.
Startup at initial rate of 9600 or below.
Range:
Default:
0-2
0
Auto Rate
This command is used for testing and debugging only.
V.32bis and V.22bis auto rate is disabled. Retrain operation is disabled or enabled in data mode, and
fallback is disabled in data mode. 0=auto rate disabled, 1=enabled.
Range:
Default:
S43
0-1
1
Auto Mode
This command is used for testing and debugging only. V.32bis startup auto mode operation disabled.
0=auto mode disabled, 1=enabled.
Range:
Default:
S48
0-1
1
LAPM Error Control and Feature Negotiation
S48=7
S48=128
Negotiation enabled.
Negotiation disabled; forces immediate fallback options specified in S36.
The following chart lists the S36 and S48 configuration settings necessary to negotiate certain types of
connections.
S36=0, 2
S36=1, 3
S36=4, 6
S36=5, 7
S89
S48=7
LAPM or hangup
LAPM or async
LAPM, MNP, or hangup
LAPM, MNP, or async
S48=128
do not use
async
MNP or hangup
MNP or async
Timer to Control Sleep Mode
This command displays the number of seconds of inactivity (no characters sent from the DTE, no RING)
in the off-line command state before the modem places itself into standby mode. A value of zero prevents
standby mode.
Note: If a number between 1 and 4 is entered for this register, it will set the value to 5, and the inactivity
before standby will be 5 seconds. This is done for compatibility with previous products which allowed
time-outs down to 1 s.
Range:
Default:
S90
0, 5-255
10
Local Phone Status
This register tells the status of the Local Phone. It is read only.
0=local phone on-hook.
1=local phone off-hook.
S91
Line Transmit Level
This register is effective only for Japan. It specifies the line transmit level in dB with an implied minus
sign.
Range:
Default:
S92
6-15 (dB)
15
Direct Connect Transmit Level
Sets the transmit level, in dBm for direct connect. This value may have different settings for different
phones.
Default:
S109
20
K56 flex/V.90 Automode Selection
S109=0
S109=1
S109=2
V.PCM disable.
K56 flex or V.90.
V.90 only.
Default:
1
4 - TROUBLESHOOTING GUIDE
This chapter describes common problems in the installation, configuration and regular usage of your
Fax/Data Modem. To test the Fax/Data Modem, a communication software package is needed and the
package must include a mode that allows you to operate your Fax/Data Modem by directly issuing internal
commands to the modem.
Follow the procedures in the following sections to resolve these common problems:
No Response From Your Modem
1. If you are using the internal add-on card modems, make sure that the COM port address you have
set your modem to corresponds to the appropriate selection in the communications software which
you are using.
2.
Issue the ATZ command to reset your modem. The returned result code should be "0" or "OK"
depending on what communications program you are using. Your modem is OK if you get one of
these responses. If there is no response after issuing the ATZ<CR>, continue to the next step.
3.
Check if there are any other interface cards in your computer that use the same COM port address
as your modem. If so, you must set your modem to another COM port address. (Keep in mind that
on most systems, only two COM ports are available. One of them must be used as either 1 or 3,
while the other must be used as 2 or 4.) For example, if a mouse is set to COM1, your modem
should be set to COM2 or COM4. Continue to the next step if the COM port address is OK.
4.
Issue the command: AT&F&W <CR>, if a "0" or "OK" result code is displayed on the screen,
your modem is OK. Otherwise, contact your dealer for assistance.
Your Modem Does Not Dial Out
Make sure that your modem responds normally. If you can communicate through the keyboard, check
whether the modem is properly connected to the phone line.
Your Modem Does Not Connect After It Has Dialed a Phone Number
The problem may have several causes. The phone line may be too noisy or the telephone cord may be
poor. Try the line with a regular phone. Also the remote modem may not recognize your modem's baud
rate.
You Can't Transmit After You Have Connected to the Remote Modem
In this case, check the communication parameters of the remote modem, then configure your software to
the same number of data bits, stop bit, and parity.
5 - APPLICATIONS EXAMPLE
5.1 Dialing a Remote Modem
Command line: ATDP9WT002, (886)-7128423<CR>
This command line instruct the modem to dial a remote modem through a PBX. The modem first use
pulse dialing to dial 9 (the access code of the PBX), wait for outside dial tone, and then use touch tone
dialing to dial 002 once a one-second continuous dial tone is detected within 30 seconds, pause for 2
seconds (if S8=2) and then dial 8867128423.
5.2 Dial a Stored Number
Command line: AT&Z2=T03,709394<CR>
Command line: ATDS=2<CR>
The first command line store the dial string T03, 709394 to the 3rd location in NVRAM. Afterwards you
can use the second command line to dial this stored number. The dial string T03, 709394 will appear on
the screen to indicate the number being dialed.
5.3 Manual Answer an Incoming Call
Command line: ATA<CR>
The factory setting of the S-register S0 is S0=0. This condition disables the auto answer capability so that
you must issue an ATA command to answer a call. At power up, your modem always monitors if there are
incoming rings. If incoming rings are detected, your modem will display result codes on the screen as :
RING
:
:
RING
Seeing that, you may issue the ATA command to answer the call. This command must be entered within
the quiet interval between any two rings.
5.4 Auto Answer an Incoming Call
Command line: AT S0=2 &W &Y<CR>
Auto answer can be enabled by changing the setting of the S-register S0 to a value between 1 and 255. In
the above command line, S0=2 instructs the modem to answer an incoming call automatically after the
2nd ring. The &W command writes this configuration to profile 0 in NVRAM. &Y command instruct the
modem to load profile 0 as the active configuration on power-up. The last two commands make S0=2 the
default value at power-up or reset.
This example also shows the insertion of space between two neighboring commands to make the
command line more readable.
5.5 Voice to Data Switching
Command line: ATA<CR> or ATX1D<CR>
If you are talking with a remote modem user through the telephone set and want to initiate data
communication with the remote modem, follow the procedure below:
1.
You or the remote user issue an ATA command first to switch to data communication.
2.
When the person on the other end hears an answer tone from the phone, issues an ATX1D
command (X1 to disasble the dial tone monitor) to instruct the modem to go off-hook and wait for
a carrier. If connection is successful, the CONNECT XXXX result code will be displayed on the
screen. Now you can hang up your phone and begin data communication with the remote modem.
A - TECHNICAL SPECIFICATIONS
Speeds
(bps)
300, 600, 1200, 2400, 4800, 7200, 9600, 12000, 14400, 19200,
21600, 24000, 26400, 28800 (plus 38400, 57600, 115.2K bps in data
mode noly)
Protocols
(Data)
56K Flex/V.90, ITU-T V.34, V.32 bis, V.32, V.22 bis, V.23, V.22,
and V.21, Bell: 212A and 103, AT&T V.32 terbo
(Fax)
ITU-T V.17, V.29, V.27 ter, and V.21 ch 2
Error Checking
100% reliable data transfer with V.42bis/MNP 5
Standards
Enhanced 'AT' command set, Fax Class 1commands
Operation
Full- or Half-duplex 33600, 31200, 28800 bps with 264000, 24000,
21600, 19200, 14400, 9600, 4800, 2400 and 1200 bps auto fall-back
Test Modes
Analog loopback, local digital loopback, and remote digital loopback
Modulation
Data
Fax
56000 bps
33600 bps
31200 bps
28800 bps
26400 bps
24000 bps
21600 bps
19200 bps
16800 bps
14400 bps
9600 bps
7200 bps
4800 bps
2400 bps
1200 bps
1200TX/75RX bps
75TX/1200RX bps
600 bps
300 bps
14400 bps
9600 bps
7200 bps
4800 bps
2400 bps
V.PCM
TCM
TCM
TCM
TCM
TCM
TCM
TCM
TCM
TCM
TCM
TCM
QAM
QAM
DPSK
FSK
FSK
DPSK
FSK
QAM
QAM
QAM
DPSK
DPSK
Audio Monitor
Built-in speaker, with software-controllable volume control
Guard Tone
550/1800 Hz
Compatibility
Data
Fax
K56 Flex/V.90
ITU-T V.34 ANNEX 12
ITU-T V.34
V.32 Terbo
ITU-T V.32bis
ITU-T V.32
ITU-T V.22bis
ITU-T V.23
ITU-T V.22
ITU-T V.21
Bell 212A
Bell 103
ITU-T V.17
ITU-T V.29
ITU-T V.27ter
ITU-T V.21 channel 2
G - III
Compliance
FCC 15 & 68
Command Buffer
128 characters
Extra Memory
4 x 36 digits
Transmit Level
-11±1dBm
56000/33600
33600/31200
28800/26400/24000/21600/19200/16800/14400
19200/16800
14400/9600 bps, asynchronous, synchronous
9600/4800 bps, asynchronous, synchronous
2400/1200 bps, asynchronous, synchronous
1200/75 bps, asynchronous, synchronous
1200 bps, asynchronous, synchronous
300 bps, asynchronous
1200 bps, asynchronous, synchronous
300 bps, asynchronous
14400/9600 bps, half-duplex
9600/7200 bps, half-duplex
4800/2400 bps, half-duplex
300 bps, half-duplex
(Group 3 fax)
Receive Sensitivity
-40dBm
Pulse Dialing Specifications
Make/Break Ratio
Break Length
Dial Pulse Length
Dial Pulse Rate
Interdigit Time
USA
39/61
61ms
100m
10pps
800ms
International
33/67
67ms
100ms
10pps
800ms
B - QUICk REFERENCE
A
Go On-line in Answer Mode
Bn
Communication Standard Setting
Cn
Carrier Control Option (dummy command)
Dn
Dial
En
AT Command Echo Options
Fn
On-Line Echo Command (dummy command)
Hn
Switchhook Control
In
Request ID Information
Ln
Speaker Volume
Mn
Speaker Control
Nn
Select Negotiate Handshake
On
Return On-Line to Data Mode
P
Enable Pulse Dialing
Qn
Results Code Display Option
T
Enable Tone Dialing
Vn
Result Code Form
Wn
Select Extended Result Codes
Xn
Result Code Selection and Call Progress Monitoring
Yn
Long Space Disconnect
Zn
Recall Stored Profile
&Bn
V.32 Auto Retrain
&Cn
Data Carrier Detect Option (Async only)
&Dn
Data Terminal Ready Option
&Fn
Load Factory Settings
&Gn
Guard Tone Option
&Jn
Auxiliary Relay Option
&Kn
Select Flow Control
&Mn
Asynchronous Communications Mode
&Pn
Pulse Dial Make-to-Break Ratio Selection
&Qn
Asynchronous Communications Mode
&Sn
Data Set Ready Option
&Tn
Self-Test Commands
&Vn
View Active Configuration and Stored Profile
&Wn
Store Current Configuration
&Yn
Select Stored Profile for Hard Reset
&Zn
Store Telephone Number
\Gn
Modem Port Flow Control
\Jn
Adjust Bits/s Rate Control
\Kn
Set Break Control
\Nn
Error Control Mode Selection
\Qn
Local Flow Control Selection
\Tn
Inactivity Timer
\Vn
Protocol Result Code
\Xn
XON/XOFF Pass Through
%B
View Numbers in Blacklist
%Cn
Data Compression Control
-Cn
Data Calling Tone
+ES=6 Enable Synchronous Buffered Mode
&&C
Write to/Read from Host Interface
&&L
Line-to-Line Loopback
&&R
Write to/Read from DSP RAM Location
&&S
Speaker Codec Loopback
@
Wait for Quiet Answer
,
Pause
!
Initiate a Hookflash
;
Return to Command State after Dialing
P
Pulse Dial
R
Reverse Dial Mode
S=n
Dial Stored Number
T
Tone DTMF Dial
W
Wait for Dial Tone
A/
Repeat Command
+++
Escape
C - HINTS FOR FAX SOFTWARE INSTALLATION
In order to make sure that your modem works properly with your PC in fax mode. Please add the
modem command \Q1 to the initial string of the fax software.
D - GLOSSARY
ASCII - An acronym for American Standard Code for Information Exchange. ASCII is a sevenbit code which defines 128 standard characters, including control characters, letters, numbers,
and symbols. An extra 128 characters comprise the extended ASCII set.
Baud Rate - The transmission rate between two serial devices, e.g., modems, fax machines,
etc. Measured in Bits Per Second.
Blind Dialing - In blind dialing, the modem continues to dial, regardless of the existence of a
dialtone, ring, or busy signal.
BPS - Bits Per Second; the number of bits that can be transmitted in one second.
Carrier Signal - The analog data signal that a modem sends over telephone wires.
COMx - Where (x = 1, 2, 3, or 4), COMx is the name(address) of serial communications ports
on personal computers. Each serial port in a personal computer has a different number.
CTS - Clear To Send
Default - The assumed value that is used for a command parameter when no other value is
explicitly provided.
DCD - Data Carrier Detect
DCE - Data Communication Equipment
DTE - Data Terminal Equipment
DTMF - Dual Tone Multifrequency(for touchtone dialing)
DTR - Data Terminal Ready
FSK - Frequency Shift Keying
Make/Break Ratio - The ratio of the off-hook (make) to on-hook (break) interval is the
make/break ratio in pulse dialing.
Modem - A combination of the words MOdulator and DEModulator. Modems transform digital
data into analog signals and back again.
Nonvolatile Memory - An area of memory inside the modem where the default configuration
profile is stored. Values recorded in this memory will not be lost when the power is turned off.
Off-Hook - The condition when the modem has picked up the telephone line.
Off-Line Command State - A modem state in which the modem accepts, interprets and
executes commands from an asynchronous computer or terminal.
On-Hook - The condition when the modem has not picked up the telephone line; the telephone
is hung up.
On-Line - A carrier signal link with a remote modem has been established; communication is in
progress.
On-Line State - A modem state in which the modem is connected with a remote modem. Data
can be sent or received from the remote modem in this state. No commands will be accepted
from the modem accept the escape command which will bring the modem into the on-line
command state.
On-Line Command State - A modem state in which the modem can accept or and execute
commands from an asynchronous computer or terminal while remaining connected with the
remote modem. The user can return the modem to the on-line state by issuing the AT0n
command or put it into the off-line command state by issuing commands such as ATZ or ATH.
Parity - An error-checking method by which the modem verifies that the data just sent is correct.
pps - Pulse per second
Profile - A list of default settings.
Protocol - A technical specification for serial communications; the protocols supported by the
modem are listed in Appendix B.
PSK - Phase Shift Keying
Pulse Dialing - A dialing form in which each digit is represented by a series of pulses. Rotary
telephones all use pulse dialing.
QAM - Quadrature Amplitude Modulation
Result Codes - The response the modem returns to the screen upon executing a command.
RAM - Random Access Memory
ROM - Read-Only Memory. A chip inside the modem which stores the factory default settings.
This memory cannot be changed.
RTS - Request To Send
RX - Reception
S Register - RAM locations in the modem which store the active configuration.
Serial Port - See COMx.
TCM - Trellis-Coded Modulation
Touchtone Dialing - A dialing format in which each digit is represented by a musical frequency.
TX - Transmission
E - ASCII CODE TABLE
Decimal
000
001
002
003
004
005
006
007
008
009
010
011
012
013
014
015
016
017
018
019
Hex
00
01
02
03
04
05
06
07
08
09
0A
0B
0C
0D
0E
0F
10
11
12
13
Value
NUL
SOH
STX
ETX
EOT
ENQ
ACK
BEL
BS
HT
LF
VT
FF
CR
SO
SI
DLE
DC1
DC2
DC3
Decimal
032
033
034
035
036
037
038
039
040
041
042
043
044
045
046
047
048
049
050
051
Hex
20
21
22
23
24
25
26
27
28
29
2A
2B
2C
2D
2E
2F
30
31
32
33
Value Decimal
(space)064
!
065
"
066
#
067
$
068
%
069
&
070
'
071
(
072
)
073
*
074
+
075
,
076
077
.
078
/
079
0
080
1
081
2
082
3
083
Hex
40
41
42
43
44
45
46
47
48
49
4A
4B
4C
4D
4E
4F
50
51
52
53
Value
@
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
Decimal
096
097
098
099
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
Hex
60
61
62
63
64
65
66
67
68
69
6A
6B
6C
6D
6E
6F
70
71
72
73
Value
'
a
b
c
d
e
f
g
h
i
j
k
l
m
n
o
p
q
r
s
020
021
022
023
024
025
026
027
028
029
030
031
14
15
16
17
18
19
1A
1B
1C
1D
1E
1F
DC4
NAK
SYN
ETB
CAN
EM
SUB
ESC
FS
GS
RS
US
052
053
054
055
056
057
058
059
060
061
062
063
34
35
36
37
38
39
3A
3B
3C
3D
3E
3F
4
5
6
7
8
9
:
;
<
=
>
?
084
085
086
087
088
089
090
091
092
093
094
095
54
55
56
57
58
59
5A
5B
5C
5D
5E
5F
T
U
V
W
X
Y
Z
[
\
]
^
_
116
117
118
119
120
121
122
123
124
125
126
127
74
75
76
77
78
79
7A
7B
7C
7D
7E
7F
t
u
v
w
x
y
z
{
|
}
~
DEL
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