JUNE 2001
MD1620A
MD1620A-JAP
Mini-Modem
(56 kbps Data/Fax Modem)
CUSTOMER SUPPORT INFORMATION
Order toll-free in the U.S. 24 hours, 7 A.M. Monday to midnight Friday: 877-877-BBOX
FREE technical support, 24 hours a day, 7 days a week: Call 724-746-5500 or fax 724-746-0746
Mail order: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018
Web site: www.blackbox.com • E-mail: info@blackbox.com
1
MINI-MODEM (56 KBPS DATA/FAX MODEM)
FEDERAL COMMUNICATIONS COMMISSION
AND
INDUSTRY CANADA
RADIO FREQUENCY INTERFERENCE STATEMENTS
This equipment generates, uses, and can radiate radio frequency energy
and if not installed and used properly, that is, in strict accordance with the
manufacturer’s instructions, may cause interference to radio communication. It
has been tested and found to comply with the limits for a Class A computing
device in accordance with the specifications in Subpart J of Part 15 of FCC rules,
which are designed to provide reasonable protection against such interference
when the equipment is operated in a commercial environment. Operation of
this equipment in a residential area is likely to cause interference, in which case
the user at his own expense will be required to take whatever measures may be
necessary to correct the interference.
Changes or modifications not expressly approved by the party responsible
for compliance could void the user’s authority to operate the equipment.
This digital apparatus does not exceed the Class A limits for radio noise emission from
digital apparatus set out in the Radio Interference Regulation of Industry Canada.
Le présent appareil numérique n’émet pas de bruits radioélectriques dépassant les limites
applicables aux appareils numériques de classe A prescrites dans le Règlement sur le
brouillage radioélectrique publié par Industrie Canada.
2
MINI-MODEM (56 KBPS DATA/FAX MODEM)
NORMAS OFICIALES MEXICANAS (NOM)
ELECTRICAL SAFETY STATEMENT
INSTRUCCIONES DE SEGURIDAD
1. Todas las instrucciones de seguridad y operación deberán ser leídas antes
de que el aparato eléctrico sea operado.
2. Las instrucciones de seguridad y operación deberán ser guardadas para
referencia futura.
3. Todas las advertencias en el aparato eléctrico y en sus instrucciones de
operación deben ser respetadas.
4. Todas las instrucciones de operación y uso deben ser seguidas.
5. El aparato eléctrico no deberá ser usado cerca del agua—por ejemplo,
cerca de la tina de baño, lavabo, sótano mojado o cerca de una alberca,
etc..
6. El aparato eléctrico debe ser usado únicamente con carritos o pedestales
que sean recomendados por el fabricante.
7. El aparato eléctrico debe ser montado a la pared o al techo sólo como sea
recomendado por el fabricante.
8. Servicio—El usuario no debe intentar dar servicio al equipo eléctrico más
allá a lo descrito en las instrucciones de operación. Todo otro servicio
deberá ser referido a personal de servicio calificado.
9. El aparato eléctrico debe ser situado de tal manera que su posición no
interfiera su uso. La colocación del aparato eléctrico sobre una cama,
sofá, alfombra o superficie similar puede bloquea la ventilación, no se
debe colocar en libreros o gabinetes que impidan el flujo de aire por los
orificios de ventilación.
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MINI-MODEM (56 KBPS DATA/FAX MODEM)
10. El equipo eléctrico deber ser situado fuera del alcance de fuentes de calor
como radiadores, registros de calor, estufas u otros aparatos (incluyendo
amplificadores) que producen calor.
11. El aparato eléctrico deberá ser connectado a una fuente de poder sólo
del tipo descrito en el instructivo de operación, o como se indique en el
aparato.
12. Precaución debe ser tomada de tal manera que la tierra fisica y la
polarización del equipo no sea eliminada.
13. Los cables de la fuente de poder deben ser guiados de tal manera que
no sean pisados ni pellizcados por objetos colocados sobre o contra ellos,
poniendo particular atención a los contactos y receptáculos donde salen
del aparato.
14. El equipo eléctrico debe ser limpiado únicamente de acuerdo a las
recomendaciones del fabricante.
15. En caso de existir, una antena externa deberá ser localizada lejos
de las lineas de energia.
16. El cable de corriente deberá ser desconectado del cuando el equipo
no sea usado por un largo periodo de tiempo.
17. Cuidado debe ser tomado de tal manera que objectos liquidos no sean
derramados sobre la cubierta u orificios de ventilación.
18. Servicio por personal calificado deberá ser provisto cuando:
A: El cable de poder o el contacto ha sido dañado; u
B: Objectos han caído o líquido ha sido derramado dentro
del aparato; o
C: El aparato ha sido expuesto a la lluvia; o
D: El aparato parece no operar normalmente o muestra un
cambio en su desempeño; o
E: El aparato ha sido tirado o su cubierta ha sido dañada.
4
MINI-MODEM (56 KBPS DATA/FAX MODEM)
TRADEMARKS
The trademarks mentioned in this manual are the sole
property of their owners.
NAMING CONVENTIONS USED IN THIS MANUAL
In the software you received, the Mini-Modem is called
the Multi-Modem or the MT5600ADX. This is the
correct software for your Mini-Modem.
5
MINI-MODEM (56 KBPS DATA/FAX MODEM)
CONTENTS
1. Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2. Introduction and Description . . . . . . . . . . . . . 14
2.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . 14
2.2 Product Description . . . . . . . . . . . . . . . . . . 14
2.2.1 What Is in Your Modem Package? . . . 18
2.2.2 How to Use This Manual . . . . . . . . . . 19
3. Installation and Connection. . . . . . . . . . . . . . . 21
3.1 Before You Install . . . . . . . . . . . . . . . . . . . . 21
3.1.1 Safety Warnings. . . . . . . . . . . . . . . . . . 21
3.1.2 Computer . . . . . . . . . . . . . . . . . . . . . . 22
3.1.3 Serial Cable . . . . . . . . . . . . . . . . . . . . . 22
3.1.4 Telephone Line . . . . . . . . . . . . . . . . . 23
3.1.5 Communications Software . . . . . . . . . 24
3.1.6 Assemble the Modem . . . . . . . . . . . . . 24
3.2 Installing the Modem . . . . . . . . . . . . . . . . . 25
3.3 LED Indicators. . . . . . . . . . . . . . . . . . . . . . . 30
3.4 Is Your Mini-Modem Ready for Use? . . . . . 33
3.5 Operating Your Mini-Modem . . . . . . . . . . . 34
3.6 Software Configuration . . . . . . . . . . . . . . . . 36
3.7 Troubleshooting . . . . . . . . . . . . . . . . . . . . . 40
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MINI-MODEM (56 KBPS DATA/FAX MODEM)
3.7.1 None of the LEDs Light When the
Modem Is On . . . . . . . . . . . . . . . . . . . 41
3.7.2 The Modem Does Not Respond to
Commands . . . . . . . . . . . . . . . . . . . . . 42
3.7.3 The Modem Dials But Cannot
Make a Connection. . . . . . . . . . . . . . . 47
3.7.4 The Modem Disconnects
While Online. . . . . . . . . . . . . . . . . . . . 52
3.7.5 The Modem Cannot Connect
When Answering. . . . . . . . . . . . . . . . . 54
3.7.6 Slow File Transfer . . . . . . . . . . . . . . . . 54
3.7.7 Losing Data . . . . . . . . . . . . . . . . . . . . . 55
3.7.8 Garbage Characters on the Monitor . 56
4. AT Commands, S-Registers, and Result Codes 58
4.1 AT Commands . . . . . . . . . . . . . . . . . . . . . . . 58
4.2 S-Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . 98
4.3 Result Codes. . . . . . . . . . . . . . . . . . . . . . . . . 124
5. Testing Your Modem. . . . . . . . . . . . . . . . . . . . . 128
5.1 Local Analog Loopback Test/V.54 Loop 3 128
5.2 Digital Loopback Test/V.54 Loop 2
(Local/Manual). . . . . . . . . . . . . . . . . . . . . . 130
5.3 Digital Loopback Test/V.54 Loop 2
(Remote/Automatic) . . . . . . . . . . . . . . . . . 132
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MINI-MODEM (56 KBPS DATA/FAX MODEM)
6. Service and Technical Support . . . . . . . . . . . . 135
6.1 Calling Black Box. . . . . . . . . . . . . . . . . . . . . 135
6.2 About the Internet. . . . . . . . . . . . . . . . . . . . 135
Appendix A: Tone-Dial Frequencies . . . . . . . . . . 136
Appendix B: Regulatory Information . . . . . . . . . 138
B.1 Single-User Software License Agreement . 138
B.2 FCC Regulations for Telephone Line
Interconnection . . . . . . . . . . . . . . . . . . . . . . 138
B.3 Canadian Limitations Notice . . . . . . . . . . . 139
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MINI-MODEM (56 KBPS DATA/FAX MODEM)
1. Specifications
Server-to-Client Data Rates — K56flex speeds when
accessing an ISP-type K56flex server (actual speed
depend on server capabilities and line conditions)
Client-to-Client Data Rates — 33,600, 31,200, 28,800,
26,400, 24,000, 21,600, 19,200, 16,800, 14,400,
12,000, 9600, 7200, 4800, 2400, 1200, 0-300 bps
Data Rates (fax) — 14,400, 9600, 7200, 4800, 2400,
300 bps
Data Format — Serial, binary, asynchronous
Compatibility — K56flex, ITU V.42bis, V.42,
Enhanced V.34, AT&T V32terbo, ITU V.32bis,
V.32, V.22bis, V.22, Bell 212A and 103/113, ITU
V.17, Group 3 T.4, T.30 and EIA Class 1
NOTE
Though this modem is capable of 56-kbps download
government regulations, line impairments, public
telephone infrastructure, and other external technological
factors currently prevent maximum 56-kbps connections.
Fax Compatibility — CCITT V.17, Group 3, V.29,
V.27ter and EIA Class 1
9
MINI-MODEM (56 KBPS DATA/FAX MODEM)
Error Correction/Data Compression — V.42
(LAP-M or MNP 3 and 4), V.42bis (4:1
throughput), MNP 5 (2:1 throughput)
Speed Conversion — Serial-port data rates
adjustable to 300, 1200, 2400, 4800, 9600, 19,200,
38,400, 57,600, and 115,200 bps
Flow Control — Software XON/XOFF, Hardware
RTS/CTS
Mode of Operation — Fax on-line modes, and full
duplex over dial-up lines
Intelligent Features — Automatic or manual dialing,
automatic or manual answer, microprocessorcontrolled, EIA extended Automode, adaptive
line probing, automatic symbol rate and carrier
frequency during start-up, retrain and rate
renegotiation, autodial, redial, tone dial, dial
pauses, call status display, auto-parity and data-rate
selection, keyboard-controlled modem options,
nonvolatile memory and on-screen displays for
modem option parameters and four telephone
numbers/command lines of up to 40 characters
each
Command Buffer — 40 characters
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MINI-MODEM (56 KBPS DATA/FAX MODEM)
Data Modulation — Trellis-Coded Modulation
(TCM) at K56flex, 33,600, 31,200, 28,800, 26,400,
24,000, 21,600, 19,200, 16,800, 14,400, 12,000,
and 9600 bps; Quadrature Amplitude Modulation
(QAM) at 9600 (non-trellis), 4800, and 2400 bps;
PSK at 1200 bps; FSK at 300 bps
Fax Modulation — V.17 TCM at 14400, 12000, 9600,
and 7200 bps; V.29 QAM at 9600 and 7200 bps;
V.27ter DPSK at 4800 and 2400 bps; V.21CH2 FSK
at 300 bps (Half Duplex)
Carrier Frequencies (Data) — 1800 Hz
V.32/V.32bis/V32terbo; Enhanced V.34/K56flex
Carrier Frequencies, 2400 & 1200 bps
(V.22bis/V.22 or Bell 212A Standard) — Transmit
Originate: 1200 Hz; Transmit Answer: 2400 Hz;
Receive Originate: 2400 Hz; Receive Answer:
1200 Hz
Carrier Frequencies, 300 bps (Bell Standard) —
1270 Hz Mark, 1070 Hz Space for Transmit
Originate; 2225 Hz Mark, 2025 Hz Space for
Receive Originate; 2225 Hz Mark, 2025 Hz Space
for Transmit Answer; 1270 Hz Mark, 1070 Hz
Space for Receive Answer
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MINI-MODEM (56 KBPS DATA/FAX MODEM)
Carrier Frequencies, V.21 — 980 Hz Mark, 1180 Hz
Space for Transmit Originate; 1650 Hz Mark, 1850
Hz Space for Transmit Answer; 1650 Hz Mark,
1850 Hz Space for Receive Originate; 980 Hz
Mark, 1180 Hz Space for Receive Answer
Carrier Frequencies, V.23 — 390 Hz Mark, 450 Hz
Space for Transmit Originate; 1300 Hz Mark, 2100
Hz Space for Transmit Answer; 1300 Hz Mark,
2100 Hz Space for Receive Originate; 390 Hz
Mark, 450 Hz Space for Receive Answer
Carrier Frequencies, Fax — V.21 CH2: Transmit
Originate: 1650 Hz Mark, 1850 Hz Space; Half
Duplex: Transmit Answer: 1650 Hz Mark, 1850 Hz
Space; V.27ter: Originate/Answer: 1800 Hz; V.29
QAM: Originate/Answer: 1800 Hz; V.17 TCM:
Originate/Answer: 1800 Hz
Transmit Level — -10 dBm (dial-up)
Frequency Stability — ±0.01%
Receiver Sensitivity — -43 dBm under worst-case
conditions
AGC Dynamic Range — 43 dB
12
MINI-MODEM (56 KBPS DATA/FAX MODEM)
Interface — EIA RS232C/CCITT V.24
Connectors — DB25 (RS-232C) connector; Two
RJ-11 modular phone jacks (one for line, one for
telephone set), and power jack.
Diagnostics — Power-On Self-Test, Local Analog
Loop, Local Digital Loop, Remote Digital Loop.
Indicators — LEDs for Send Data, Receive Data,
Carrier Detect, various speed indicators, Off Hook,
Terminal Ready, Error Correction, Fax.
Controls — Power ON/OFF Switch
Speaker — 2-inch cone with software- or command-
controlled volume
Operating Temperature — 32 to 120°F (0 to 50°C)
Power Requirement — MD1620A: 115 VAC, 60 Hz,
0.3 amp (2-prong outlet-mounted transformer);
MD1620A-JAP: Input voltage: 100 VAC, Input
frequency: 60/50 Hz; Output voltage: 14 V,
714 mA; International models: 240V/50Hz
optional
Power Consumption — 5 Watts
13
MINI-MODEM (56 KBPS DATA/FAX MODEM)
Regulatory Compliance — UL, CUL, CSA, FCC
Size — 5.6"H x 4.25"W x 1.15"D
(14.8 x 10.8 x 2.9 cm)
Weight — 0.5 lb. (1.1 kg)
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MINI-MODEM (56 KBPS DATA/FAX MODEM)
2. Introduction and Description
2.1 Introduction
This User’s Manual will help you install, configure, test
and use your Mini-Modem (56 kbps Data/Fax Modem).
2.2 Product Description
Your Mini-Modem incorporates a modem technology
called K56flex™ that enables Internet connections at
data rates up to 56 kbps over standard telephone lines.
(In the United States, FCC regulations limit transmission
speed to 53 kbps.) K56flex technology is able to propel
data downstream from the Internet to your computer at
speeds of up to 56 kbps because data is digitally encoded
instead of modulated. Upstream transmission, mostly
keystroke and mouse commands from your computer
to the central site, continues to flow at the conventional
data rate of 33.6 kbps.
Your Mini-Modem offers interactive automatic dialing,
as well as command mode option configuration. You
may store four command lines or telephone numbers,
of up to 40 characters each, in the modem’s nonvolatile
memory. The modem pulse or tone-dials, and recog-
15
MINI-MODEM (56 KBPS DATA/FAX MODEM)
nizes dial tones and busy signals for reliable call-progress
detection. The modem can detect AT&T calling card
tones. It is FCC-Registered for connection to telephone
networks without any Data Access Arrangements
(DAAs).
NOTE
Though this modem is capable of 56-kbps download
performance, government regulations, line impairments,
public telephone infrastructure, and other external
technological factors currently prevent maximum 56-kbps
connections.
The Mini-Modem is a desktop fax/modem for
compatible IBM Personal Computers. It provides
ial-up asynchronous communication capability with
other personal computers, terminals, on-line computer
services, or other types of computer systems.
Connection to the phone line and/or an attached
telephone device is made by RJ-11 modular connectors;
the PC connection is made via an RS-232C/V.24 serial
cable receptacle; and low-voltage DC power is supplied
to the Mini-Modem through a modular power-supply
connection included with the modem. All these
connections are located on the rear of the Mini-Modem.
Hardware installation procedures are described in
Chapter 3.
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MINI-MODEM (56 KBPS DATA/FAX MODEM)
General features include:
• Compliance with major ITU-T, TIA, and EIA
international standards to ensure compatibility
with other modems.
• Distinguishes data and fax calls.
• Caller ID to identify your caller’s phone number
(available on U.S. products).
Data
• Supports K56flex
™
for data transmission speeds up
to 56 kbps, while maintaining compatibility with
lower-speed modems.
NOTE
The K56flex standard asymmetrically transfers data—
client downloads at speeds up to 56 kbps, client
uploads at speeds up to 33.6 kbps.
• Supports the enhanced ITU-T V.34 standard, with
data transmission speeds to 33.6 kbps, while also
maintaining compatibility with lower-speed
modems.
• Supports K56flex speeds plus 33.6K, 31.2K, 28.8K,
26.4K, 24K, 21.6K, 19.2K, 16.8K, 14.4K, 12K, 9.6K,
7.2K, 4.8K, 2.4K, 1.2K, and 0-300 bps.
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MINI-MODEM (56 KBPS DATA/FAX MODEM)
• Automatic fallback to slower speeds in noisy line
conditions, and fall-forward to faster speeds as
conditions improve (line-quality monitoring).
• ITU V.42 LAP-M and MNP Class 3 and 4
error correction.
• ITU V.42bis (4-to-1) and MNP 5 (2-to-1)
data compression.
• MNP10 and MNP10EC
™
enhanced
Cellular Performance (error correction).
• H.324 compliant (videophone ready).
• Automatic disabling of compression when
transferring already-compressed files.
• Autodial, redial, pulse (rotary) and touch-tone
dial.
• Dial tone and busy signal detection for reliable
call-progress detection.
• Distinctive ring support to route voice, data,
or fax calls on a single phone line.
• Plug and Play (PnP) serial support.
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MINI-MODEM (56 KBPS DATA/FAX MODEM)
• Flash-ROM upgradable.
• Compatibility with the standard AT command
set used by most communication programs.
Fax
• Supports V.17, Class 1/Group 3 fax
communication standards, allowing it to
communicate with other fax modems as
well as with fax machines.
• Sends and receives faxes from your computer
at 14,400 bps, 9600 bps, 7200 bps, 4800 bps,
2400 bps, or 300 bps.
2.2.1 W
HAT
I
SINYOURMODEMPACKAGE
?
Your Mini-Modem has several components:
• Mini-Modem (56 kbps Data/Fax Modem)
• DC power supply
• One set of four plastic feet
• Telephone cord
• This User Manual
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MINI-MODEM (56 KBPS DATA/FAX MODEM)
• Communications Software
• One Set-Up diskette
If any of these items are missing, please contact Black
Box at 724-746-5500.
2.2.2 H
OW TOUSETHISMANUAL
This manual is divided into six chapters and two
appendixes:
• Chapter 1, Specifications, lists relevant technical
specifications for the Mini-Modem.
• Chapter 2, Introduction and Description, begins
with a short product introduction and description,
followed by a guide (which you are now reading)
to the use of this manual.
• Chapter 3, Installation and Connection,
documents the procedure for connecting the
Mini-Modem to your computer and to the phone
line. There is also a Troubleshooting section in
case your Mini-Modem is not operating properly.
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MINI-MODEM (56 KBPS DATA/FAX MODEM)
• Chapter 4, AT Commands, S-Registers and Result
Codes, documents default and option AT
commands, S-Registers and Result Codes
supported by the Mini-Modem.
• Chapter 5, Testing Your Modem, covers the
modem’s built-in test features. These are: Poweron Self Test, Local Analog Loopback, Digital
Loopback and Remote Digital Loopback Tests.
We have included a description of each test
and how to use each test procedure.
• Chapter 6, Calling for Technical Support.
• Appendix A, Tone-Dial Frequencies.
• Appendix B, Regulatory Information.
21
MINI-MODEM (56 KBPS DATA/FAX MODEM)
3. Installation and Connection
3.1 Before You Install
3.1.1 S
AFETYWARNINGS
SAFETY WARNINGS
1. Never install telephone wiring during a lightning
storm.
2. Never install telephone jacks in wet locations unless
the jack is specifically designed for wet locations.
3. Never touch uninsulated telephone wires or
terminals unless the telephone line has been
disconnected at the network interface.
4. Use caution when installing or modifying telephone
lines.
5. Avoid using a telephone (other than a cordless type)
during an electrical storm. There may be a remote risk of
electrical shock from lightning.
6. Do not use the telephone to report a gas leak in the
vicinity of the leak.
In addition to the contents of the Mini-Modem
package, you will need the following equipment.
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MINI-MODEM (56 KBPS DATA/FAX MODEM)
3.1.2 C
OMPUTER
The Mini-Modem can be connected to any computer
with an RS-232 serial port.
3.1.3 S
ERIALCABLE
You must provide a serial cable to connect the
Mini-Modem to your computer. Call Black Box at
724-746-5500 for ordering information. The cable must
have a DB25 male connector at the modem end. For
IBM and compatible computers, the other end may
have a DB25 male connector or a DB9 female
connector, depending on your particular computer
and whether you are using the COM1 or the COM2
serial port. The FCC requires cables to be shielded.
23
MINI-MODEM (56 KBPS DATA/FAX MODEM)
Figure 3-1. Serial Connectors on the PC.
3.1.4 T
ELEPHONELINE
You must have a telephone line with a conveniently
located connector (jack) to accept the cable that comes
with the Mini-Modem. If you do not have a telephone
jack near your computer, you should install an extension
before proceeding.
In North America, telephone extension kits and
accessories are available at electronics stores and
wherever telephones are sold. You may also hire an
independent contractor or your local telephone
company to do the work. If you want to add a line for
24
MINI-MODEM (56 KBPS DATA/FAX MODEM)
your Mini-Modem fax modem, you must contact
your telephone company.
3.1.5 C
OMMUNICATIONSSOFTWARE
To operate the Mini-Modem, you must have data and
fax communications software. Datacomm software
simplifies control of the modem by guiding you through
the process of selecting your serial port, your port speed,
and other variables, and then storing your settings,
including frequently called phone numbers, so they
can be recalled with the stroke of a key or the click
of a mouse. The software must be set up, or configured,
before you can use it. You must have Microsoft Windows
3.1 or later to run most prevalent software packages.
3.1.6 A
SSEMBLE THEMODEM
The only assembly required is to mount the feet on the
bottom of the modem. Simply peel the four self-adhesive
plastic feet off the backing strip and press them into the
recesses on the bottom of the modem. You can also use
self-adhesive Velcro patches (not included) to mount
the modem on a vertical surface or to keep it from being
dislodged on a horizontal surface.
25
MINI-MODEM (56 KBPS DATA/FAX MODEM)
If you use Velcro patches, we recommend that you
mount them where they will not obscure the labels on
the bottom of the modem. The Mini-Modem has no
special placement restrictions, but we recommend that
you place it where you can see the indicators on the
front panel.
3.2 Installing the Modem
Figure 3-2. Mini-Modem Connections.
To install your Mini-Modem:
1. Attach the Mini-Modem to dial-up phone lines
using the RJ-11 telephone cord by plugging one
end of the cable provided with the Mini-Modem
into the telephone jack in your home or office,
and plugging the other end into the LINE jack
on the MiniModem.
POWER RS-232 PHONE LINE
26
MINI-MODEM (56 KBPS DATA/FAX MODEM)
NOTE
The LINE jack is not interchangeable with the PHONE
jack on the Mini-Modem. Do not plug the telephone into
the LINE jack or the line cable into the PHONE jack.
BABT regulations require that the telecommunication
cable be connected to the modem prior to being
connected to the network.
2. Attach your Mini-Modem to your PC or terminal
with an RS-232 (or V.24) cable (see Figure 3-1
and Figure 3-2). Be sure to tighten the mounting
screws on the DB connectors.
3. Connect your telephone set to phone jack
via RJ-11 cable.
4. Attach your Mini-Modem to the AC Power
transformer and plug the AC connector into
a live AC outlet.
NOTE
Use only the power supply provided with the Mini-Modem.
Using any other power supply could damage the modem.
5. Turn on power by flipping the “ON/OFF” switch
on the side of the Mini-Modem to the “ON”
position.
27
MINI-MODEM (56 KBPS DATA/FAX MODEM)
6. Make sure modem and computer/terminal serialport baud rates are adjusted. Note that several
programs can check this for you.
Install the Modem in Windows 95
If you are using Windows 95 or 98, you must install
the modem in the operating system. (If you are using
another operating system, you may skip this step.)
Adding the Mini-Modem to Windows 95 or 98
1. Click the Start button, point to Settings, and click
Control Panel.
2. Double-click the Modems icon. If no modem is
currently installed, the Install New Modem wizard
appears. If a modem is already installed, the
Modems Properties sheet appears; click Add
to go to the Install New Modem wizard.
3. Click Next in the Install New Modem wizard.
Windows searches for your new modem and
asks you to verify its selection.
NOTE
If Windows cannot find a modem, your modem may be
turned off, it may be plugged into the wrong connector
on your computer, or the serial cable may be faulty.
28
MINI-MODEM (56 KBPS DATA/FAX MODEM)
4. If Windows identifies your modem correctly as a
MultiModem MT5600ZDX, click Next to install
the modem. After the modem is installed, click
Finish to exit.
5. If Windows cannot identify your modem (for
instance, if it identifies your modem as a “Standard
Modem”), click Change. A dialog box with a list
of manufacturers and a list of modems appears.
6. Select “MultiTech Systems” from the
Manufacturers list box, then select “MultiModem
MT5600ZDX” from the Models list box.
7. Click Next. Windows installs and configures
the modem.
8. Click Finish to exit.
Removing Your Old Modem from Windows 95 or 98
When your Mini-Modem replaces another modem, the
old modem installation remains in Windows after you
install the new modem, and the old modem is still
selected in HyperTerminal and other Windows 95
applications. Although you can change the application
connection descriptions one at a time, it is easier to
29
MINI-MODEM (56 KBPS DATA/FAX MODEM)
force Windows 95 applications to use the Mini-Modem
by removing the old modem from Windows.
1. Click the Start button, point to Settings, and click
Control Panel.
2. Double-click the Modems icon to open the
Modems Properties sheet.
3. In the list box, select the old modem.
4. Click Remove, then click Close.
5. The next time you dial a HyperTerminal
connection, it will select your new modem
and ask you to confirm the selection.
Installing Your Modem in MS-DOS 5.0 or Higher
If you have MS-DOS 5.0 or higher, a program called
MSD.EXE [Microsoft Diagnostics] is in your DOS
directory. Typing MSD at the DOS prompt brings up
a screen that provides a variety of information about
your computer. Select COM ports and it lists information about your com port, e.g., UART Type, Address,
and IRQ, to name a few. Once you know your serial
port’s UART type, you can set your communications’s
software appropriately.)
30
MINI-MODEM (56 KBPS DATA/FAX MODEM)
Figure 3-3. Mini-Modem Connections.
3.3 LED Indicators
The Mini-Modem has ten LED indicators to report
status (such as verifying proper installation) and line
activity (such as monitoring the status of a connection).
POWER RS-232 PHONE LINE
31
MINI-MODEM (56 KBPS DATA/FAX MODEM)
Figure 3-4. Mini-Modem Front Panel.
• TD: Transmit Data. The TD LED flashes when
data is being transmitted (on for a space, off for a
mark). Signals on this circuit are generated by the
terminal and transferred to the transmitter of the
Mini-Modem. The transmitting terminal should
hold this line in the marking state when no data
is being transmitted, including intervals between
characters or words. The TRANSMIT (TD) LED
indicates the status of this circuit.
• RD: Receive Data. The RD LED flashes when data
is being received (on for a space, off for a mark).
Data signals received from the remote MiniModem are presented on this line. The RECEIVE
(RD) LED indicates the status of this signal.
32
MINI-MODEM (56 KBPS DATA/FAX MODEM)
Figure 3-5. Mini-Modem Front Panel.
• 56: K56flex. This LED is lit when connected to an
ISP-type K56flex server. The actual connection
speed is contingent upon server capabilities and
line conditions.
• 28: V.34. This LED is lit when the modem is
connected in V.34 mode.
• 14: V.32bis. This LED is lit when the modem is
connected in V.32bis mode. Note that at speeds
lower than a V.32bis connection, the Mini-Modem
speed LEDs remain unlit.
• OH: Off Hook. The condition of Off Hook
indicates to the central office that the Mini-
33
MINI-MODEM (56 KBPS DATA/FAX MODEM)
Modem wants the phone line to do something
(dial or answer a call). This LED is also lit when
the Mini-Modem has achieved online status.
• TR: Terminal Ready. When TR is lit, the MiniModem can answer an incoming call. This signal
(TR or DTR) provides a means for the terminal
or computer to control the Mini-Modem’s
connection to the communications channel. A
high DTR signal is required by the Mini-Modem to
be able to communicate. The state of the TR LED
matches that of the DTR circuit on pin 20 of the
RS-232/V.24 interface.
• EC: Error Correction. This LED is lit when the
modem is set for V.42 error correction, and flashes
on and off when data compression is activated.
• FX: Fax. This LED is lit when the modem is
connected in Fax mode.
3.4 Is Your Mini-Modem Ready for Use?
As soon as you have connected power to the modem,
if you’re an experienced modem user, you may simply
want to check your modem’s settings for data compression, error correction, and so on. You may find that you
can get moving quite quickly if you just issue the
34
MINI-MODEM (56 KBPS DATA/FAX MODEM)
AT&V<cr> command. This command lists how your
modem is currently configured, the stored (user)
profiles, and the first four stored telephone numbers.
If you come across a setting you’re unsure of, refer to
Chapter 4 of this manual for AT command and
S-Register explanations and defaults.
If you’re a novice, please continue to the next sections
of this chapter.
3.5 Operating Your Mini-Modem
You control your Mini-Modem by issuing AT commands
and setting S-Registers. Right now your Mini-Modem is
set up for the most typical user application, that is, as a
traditional modem set to make a dial-up call to a remote
installation where the call is answered automatically;
therefore, you shouldn’t need to change the current
default configuration. (If, however, you know that your
application does not follow this profile, please refer to
Chapter 4 for AT Commands and S-Registers.)
In operating your Mini-Modem, it’s likely that you’ll
use your data-communications software to do one of
two things:
35
MINI-MODEM (56 KBPS DATA/FAX MODEM)
• Enter “terminal” mode, where you can speak most
directly to the modem by issuing AT commands.
• Launch a datacomm session through a set of
modem configurations which you select and then
associate with a target telephone number. Once
you have created, saved, and named this set of
information according to your connection needs
and your datacomm software’s conventions, the
software then simplifies your dialing, because you
needn’t reconfigure your modem or run the risk
of mistakenly keying-in incorrect information.
If you use modern communications software (such as
Web browsers and Internet dialers), you may never have
to use AT commands, although they can sometimes be
useful for quick configuration adjustments.
If you’re controlling the Mini-Modem in “terminal”
mode, you’ll need to know how AT commands work.
AT stands for attention, and alerts the modem that a
command follows. You may enter these commands with
either upper- or lower-case characters. Entering AT
automatically sets the modem’s serial baud rate to match
your computer’s and also sets the modem’s parity. It also
clears the modem’s command buffer. Once you’re in
36
MINI-MODEM (56 KBPS DATA/FAX MODEM)
terminal mode, enter AT followed by <CR> to check
whether your modem is operational. If everything’s fine,
your modem will respond OK.
S
IMPLEOPERATIONS
You can dial by using the ATD command and the
phone number of the modem with which you wish
to connect—for example, ATDT17245553500. Your
modem will dial the number; a “scrambling” noise is
heard as the modem negotiates the kind of connection
it can make, and once the modems have settled on a
common connection, a connect message on your
computer’s video is displayed. To hang up a call, enter
ATH0<CR>. Your modem will return on hook, just as if
you had returned a phone’s handset to its cradle. Your
video now displays OK, signifying that your modem is
ready for your next command.
3.6 Software Configuration
Communications software must be configured to work
with the Mini-Modem, your computer, and the remote
system it is calling. Fortunately, most communications
programs make the process easy by providing a default
initialization string to your modem as well as defaults for
most of the other required parameters.
37
MINI-MODEM (56 KBPS DATA/FAX MODEM)
Some software programs allow you to select your
modem type from a menu. By this method, you can
select initialization strings that correspond to a
particular modem type to operate optimally with
the software it is using.
NOTE
Refer to your software manual for further information
on your communications software.
Figure 3-6. Mini-Modem Initialization Setup.
Other software programs require you to enter an
initialization string in the software modem setup screen.
If this is the requirement in your software application,
enter the following command string to initialize your
38
MINI-MODEM (56 KBPS DATA/FAX MODEM)
modem: AT&F<cr>. This setting configures your modem
to operate optimally with the software it is using.
H
ARDWARE
/S
OFTWARE
C
ONFIRMATION
To confirm that your modem (hardware) and
communications package (software) is working properly:
1. Go into terminal mode in your communications
package.
2. To determine if your computer and modem are
communicating properly, enter: AT<CR>. At this
point, your video monitor should display OK. If
the characters you typed do not appear or if
double characters appear, see Section 3.7.
3. To confirm how your Mini-Modem is configured,
enter AT&V<cr>. What is then reported is how the
Mini-Modem is currently configured.
Example: AT&V
ACTIVE PROFILE
B0 E1 L1 M1 N1 QO T V1 W0 X4 Y0 &C0 &G2 &J0
&K3 &Q5 &R1 &S0 &T4 &X0 &Y0
39
MINI-MODEM (56 KBPS DATA/FAX MODEM)
S00:002 S01:000 S02:043 S03:013 S04:010 S05:008
S06:002 S07:030 S08:002 S09:006
S10:014 S11:255 S12:050 S18:000 S25:005 S26:001
S36:007 S37:000 S38:020 S46:138
S48:007 S95:000
STORED PROFILE 0:
B0 E1 L1 M1 N1 QO T V1 W0 X4 Y0 &C0 &D0 &G2
&J0 &K3 &Q5 &R1 &S0 &T4 &X0
S00:002 S02:043 S06:002 S07:030 S08:002 S09:006
S10:014 S11:095 S12:050 S18:000
S36:007 S37:000 S40:105 S41:003 S46:138 S95:000
STORED PROFILE 1:
B0 E1 L1 M1 N1 QO T V1 W0 X4 Y0 &C0 &D0 &G2
&J0 &K3 &Q5 &R1 &S0 &T4 &X0
S00:002 S02:043 S06:002 S07:030 S08:002 S09:006
S10:014 S11:095 S12:050 S18:000
S36:007 S37:000 S40:105 S41:003 S46:138 S95:000
TELEPHONE NUMBERS:
0=1=
2=3=
OK
40
MINI-MODEM (56 KBPS DATA/FAX MODEM)
3.7 Troubleshooting
Your Mini-Modem was thoroughly tested at the factory
before it was shipped. If you are unable to make a
successful connection or if you experience data loss or
garbled characters during your connection, the modem
might be defective. However, it is more likely that the
source of your problem lies elsewhere. Problems you
might encounter include:
• None of the LEDs light when the modem is on;
• The modem does not respond to commands;
• The modem dials but is unable to make a
connection;
• The modem disconnects while online;
• The modem cannot connect when answering;
• Slow file transfer;
• Losing data; or
• Garbage characters on the monitor
41
MINI-MODEM (56 KBPS DATA/FAX MODEM)
3.7.1 N
ONE OF THE
LEDSL
IGHTWHEN THEMODEM ISON
When you turn on the Mini-Modem, the LED indicators
on the front panel should flash briefly as the modem
runs a self-test. If the LEDs remain off, the modem is
probably not receiving power.
• Make sure the modem’s power switch is on,
especially if you normally turn on the modem
by turning on a power strip.
• If the power supply is plugged into a power strip,
make sure the power strip is plugged in, and its
power switch is on.
• Make sure the power-supply module is firmly
connected to the modem and to the wall outlet
or power strip.
• If the power strip is on and the modem switch
is on, try moving the modem power supply to
another outlet on the power strip.
• Make sure the outlet is live by plugging a lamp
into it.
• The modem or power supply may be defective.
If you have another Mini-Modem, try swapping
42
MINI-MODEM (56 KBPS DATA/FAX MODEM)
modems. If the problem goes away, the first
modem or power supply may be defective. Call
Technical Support at 724-746-5500 for assistance.
NOTE
Do not under any circumstances replace the powersupply with one designed for another product, since
this may damage the modem.
3.7.2 T
HEMODEMDOESNOTRESPOND TOCOMMANDS
• Make sure the modem is plugged in and powered
on.
• Make sure you are issuing the modem commands
from the data-communications software, either
manually in terminal mode or automatically once
you have configured the software. (You cannot
send commands to the modem from the DOS
prompt.)
• Make sure you are in terminal mode in your datacommunications program, then type AT and press
ENTER. If you get an OK response, your
connections are good and the problem likely is in
your phonebook entry or session settings. Be sure
your modem is not in data mode when you type a
command. The default escape sequence is to wait
43
MINI-MODEM (56 KBPS DATA/FAX MODEM)
at least one second, enter +++, and pause another
second or more before entering a command.
• The E0 and Q1 commands may be in effect,
disabling echo and responses. Verify this with
the &V command. To enable echo and responses,
enter ATE1Q0<cr>.
• Try resetting your modem by turning it off and on.
Make sure there is a reset command (&F) in your
initialization string, or your modem may not
initialize correctly.
• If you don’t get an OK, the problem may still be in
the communications software. Make sure you have
done whatever is necessary in your software to
make a port connection. Not all communications
programs connect to the COM port automatically.
Some connect when the software loads and
remain connected until the program terminates.
Others can disconnect without exiting the
program. Many communication software packages
also allow multiple terminals to be open, but only
one can access the modem at a time. If your
package reports that it cannot make a connection,
yet the modem’s TR indicator is on, click on the
Window menu to see if more than one terminal is
open. The modem’s TR indicator shows that the
44
MINI-MODEM (56 KBPS DATA/FAX MODEM)
software has made a connection with the modem
through the COM port.
• Your communication-software settings may not
match the physical port the modem is connected
to. The serial cable may be plugged into the wrong
connector—check your computer documentation
to make sure. Or you may have selected a COM
port in your software other than the one the
modem is physically connected to—compare the
settings in your software to the physical
connection.
• If the modem is on, the cable is plugged into the
correct port, the communications software is
configured correctly, and you still don’t get an
OK, the fault may be in the serial cable. Make
sure it is firmly connected at both ends.
• Is this the first time you have used the cable? If so,
it may not be correct. Check the cable description
on the packaging to make sure the cable is the
right one for your computer.
• Peripheral expansion cards, such as bus-mouse
and sound cards, may include a serial port
preconfigured as COM1 or COM2. The extra
serial port, or the card itself, may use the same
45
MINI-MODEM (56 KBPS DATA/FAX MODEM)
COM port, memory address, or interrupt request
(IRQ) as your communications port. Be sure to
disable any unused ports.
To look for address or IRQ conflicts if you use
Windows 3.1x, select File, Run in Program
Manager, type MSD, and press ENTER. Then
select Mouse, COM Ports, and IRQ Status and note
the addreses and IRQs that are in use. If you find
an IRQ conflict, note which IRQs are not being
used, then change one of the conflicting devices to
use one of the unused IRQs. If you find an address
conflict, change the address of one of the
conflicting devices.
To change a port address or IRQ in Windows 3.1x,
double-click the Control Panel icon, then the Ports
icon. Click on the port you want to change, click
Settings, click Advanced, and select the new port
address and/or interrupt. If you wish to use COM3
or COM4, note that COM3 shares an IRQ with
COM1, as does COM4 with COM2, so you should
change their IRQs to unused ones, if possible.
If you use Windows 95 or 98, right-click on My
Computer, select Properties from the menu, click on
the Device Manager tab, double-click on Ports, then
double-click on the Communications Port your
46
MINI-MODEM (56 KBPS DATA/FAX MODEM)
modem is connected to. In the port’s Properties
sheet, click on the Resources tab to see the port’s
Input/Output range and Interrupt Request. If
another device is using the same address range or
IRQ, it will appear in the Conflicting Device List.
Uncheck Use Automatic Settings to change the
port’s settings so they do not conflict with the
other device, or select the port the conflicting
device is on and change it instead. If you need
to open your computer to change switches or
jumpers on the conflicting device, refer to the
device’s documentation.
• The serial port may be defective. If you have
another serial port, install the modem on it,
change the COM-port setting in your software,
and try again.
• The modem may be defective. If you have another
Mini-Modem, try swapping modems. If the
problem goes away, the first modem is possibly
defective. Call Technical Support for assistance.
47
MINI-MODEM (56 KBPS DATA/FAX MODEM)
3.7.3 T
HEMODEMDIALSBUTCANNOTMAKE ACONNECTION
There can be several reasons the Mini-Modem fails to
make a connection:
• modem is not configured properly.
• lack of a physical connection to the telephone line.
• a wrong dial tone.
• a busy signal.
• a wrong number.
• no modem at the other end.
• a faulty modem, computer, or software at the
other end.
• incompatibility between modems.
You can narrow the list of possibilities by using
extended result codes. To enable them, enter ATV1X4
and press ENTER while in terminal mode, or include
V1X4 in the modem’s initialization string. When you
dial again, the modem will report the call’s progress.
48
MINI-MODEM (56 KBPS DATA/FAX MODEM)
• Both local and remote modems may be
misconfigured, making negotiation between
modems difficult. The solution may be to modify
modem parameters via AT command strings.
There are other configurations you can modify
as well. Note that you can return to the modem’s
default configurating by entering AT&F.
If your application requires modification, use the
command strings shown in Table 3-1 that correspond
to your application:
49
MINI-MODEM (56 KBPS DATA/FAX MODEM)
Table 3-1. Setting Up Protocols via AT Command Strings.
To Force Different Communication Speeds/Protocols Enter these Commands
Negotiate Speed and Protocol (default setting) AT&F
Negotiate Speed only, do not use protocol AT\N0
Connect at 56000 bps (V.34) AT+MS=56
Connect at 33600 bps (V.34) AT+MS=11
Connect at 14400 bps (V.32bis) AT+MS=10
Connect at 9600 bps (V.32) AT+MS=9
Connect at 2400 bps (V.22bis) AT+MS=2
Connect at 1200 bps (V.22) AT+MS=1
Connect at 1200 bps, no protocol AT\N0+MS=1
Force Protocol AT\N3
Force No Protocol AT\N0
MNP4/MNP5 operation AT\N5
LAP-M only operation AT\N4
MNP4 only operation AT\N5%C0
MNP10 only operation AT-K1 -SEC=1
No error correction/data compression, but speed AT\N0
buffering/auto-speed is operational
Auto-answer operation AT S0=1
50
MINI-MODEM (56 KBPS DATA/FAX MODEM)
• If the modem reports NO DIALTONE, check that
the modem’s telephone line cable is connected to
both the modem’s LINE jack (not the PHONE
jack) and the telephone wall jack. If the cable
looks secure, try replacing it. If that doesn’t work,
the problem may be in your building’s telephone
installation. To test the building installation, plug
a telephone into your modem’s telephone wall
jack and listen for a dial tone. If you hear a dial
tone, your modem may be installed behind a
company phone system (PBX) with an internal
dial tone that sounds different from the normal
dial tone. In that case, the modem may not
recognize the dial tone and may treat it as an
error. Check your PBX manual to see if you can
change the internal dial tone; if you can’t, change
your modem’s initialization string to replace X4
with X3, which will cause the modem to ignore
dial tones.
• If the modem reports BUSY, the other number
may be busy, in which case you should try again
later, or it may indicate that you have failed to add
a 9, prefix to the phone number if you must dial 9
for an outside line.
If you must dial 9 for an outside line, the easiest
way to dial it automatically is to include it in the
51
MINI-MODEM (56 KBPS DATA/FAX MODEM)
modem’s dial prefix—for example, ATDT9,.
Note the comma, which inserts a pause before
the number is dialed. By inserting 9 and a comma
into the dial prefix, you do not have to include
it in each directory entry.
To change the dial prefix in your communications
package, select Setup, Modem; then select the
modem type you are using, and type the new
prefix in the Dial Prefix box. To change the
dial prefix in Windows Terminal, select Settings,
Modem Commands.
To change it in Windows 95 or 98 HyperTerminal,
select Call, Connect from the menu bar, click
Dialing Properties, and type 9 in the local and long
distance boxes in How Do I Dial from This Location.
• If the modem reports NO ANSWER, the other
system has failed to go off-hook, or you might have
dialed a wrong number. Check the number.
• If the modem reports NO CARRIER, the phone
was answered at the wrong number, and a person
answered instead of a computer, or you might
have dialed the correct number but the other
computer or software was turned off or faulty.
Check the number and try again, or try calling
52
MINI-MODEM (56 KBPS DATA/FAX MODEM)
another system to make sure your modem is
working. Also, try calling the number on your
telephone, if you hear harsh sounds, then another
modem is answering the call, and the modems
may be having problems negotiating because of
modem incompatibilities or line noise. Try
connecting at a lower speed.
3.7.4 T
HEMODEMDISCONNECTSWHILEONLINE
• If you have call waiting on the same phone line
as your modem, it may interrupt your connection
when someone tries to call you. If you have call
waiting, disable it before each call. In most
telephone areas, you can disable call waiting
by preceding the telephone number with *70
(check with your local telephone company).
You can automatically disable call waiting by
including the disabling code in the modem’s dial
prefix (for example, ATDT*70,—note the comma,
which inserts a pause before the number is
dialed). To change the dial prefix in your
communications package, select Setup, Modem;
then select the modem type you are using, and
type the new prefix in the Dial Prefix box. To
change the dial prefix in Windows Terminal,
select Settings, Modem Commands. To change
53
MINI-MODEM (56 KBPS DATA/FAX MODEM)
it in Windows 95 or 98 HyperTerminal, select Call,
Connect from the menu bar, click Dialing Properties,
check This Location Has Call Waiting, and select
the correct code for your phone service.
• If you have extension phones on the same line as
your modem, you or someone else can interrupt
the connection by picking up another phone. If
this is a frequent problem, disconnect the
extension phones before using the modem, or
install another phone line especially for the
modem.
• Check for loose connections between the modem
and the computer, the telephone jack, and AC
power.
• You may have had a poor connection because
of line conditions, or the problem may have
originated on the other end of the line. Try again.
• If you were online with a BBS, it may have hung
up on you because of lack of activity on your part
or because you exceeded your time limit for the
day. Try again.
54
MINI-MODEM (56 KBPS DATA/FAX MODEM)
3.7.5 T
HEMODEMCANNOTCONNECTWHENANSWERING
• Auto-answer may be disabled. Turn on autoanswer in your datacomm program or send the
command ATS0=1 to your modem in terminal
mode.
3.7.6 S
LOWFILETRANSFER
• You may have an older UART. For best
throughput, install a 16550FN or higher UART.
• If you are running under Windows 3.1 and have a
16550AFN UART, you must replace the Windows
serial driver, COMM.DRV, to take full advantage
of the UART’s speed.
• If you are using a slow transfer protocol, such as
Xmodem or Kermit, try Zmodem or Ymodem/G
instead.
• Is your line noisy? If there is static on your line,
the modem has to resend many blocks of data to
insure accuracy. You must have a clean line for
maximum speed.
• Are you downloading a compressed file with
MNP5 hardware compression enabled? Since
hardware data compression cannot compress
55
MINI-MODEM (56 KBPS DATA/FAX MODEM)
a file already compressed by an archiving program,
the transfer can be marginally slower with data
compression enabled than with it disabled.
• Try entering the &V (View Parameters) command,
making a screen print of the diagnostics listing,
and checking for parameters that may be
unacceptable.
3.7.7 L
OSINGDATA
• If you are using data compression and a high
speed serial port, set the serial port baud rate
to four times the data rate.
• Your UART may not be reliable at serial port
speeds over 9600 bps or 19,200 bps. Turn off
data compression, reset your serial-port speed
to a lower rate, or replace your serial port with
a faster one.
• Make sure the flow-control method you selected
in software matches the method selected in the
modem.
• If you are running under Windows 3.1 and have
a 16550AFN UART, you may need to turn on the
56
MINI-MODEM (56 KBPS DATA/FAX MODEM)
16550’s data buffers and/or replace the Windows
serial driver, COMM.DRV.
• Try entering the &V (View Parameters) command,
making a screen print of the diagnostics listing,
and checking for parameters that may be
unacceptable.
3.7.8 G
ARBAGECHARACTERS ON THEMONITOR
• Your computer and the remote computer may be
set to different word lengths, stop bits, or parities.
If you have connected at 8-N-1, try changing to
7-E-1, or vice-versa, using your communications
software.
• You may be experiencing line noise. Enable error
correction, if it is disabled, or hang up and call
again; you may get a better connection.
• At speeds above 2400 bps, the remote modem
might not use the same transmission or error
correction standards as your modem. Try
connecting at a slower speed or disabling error
correction. (With no error correction, however,
the line noise can cause garbage characters.)
57
MINI-MODEM (56 KBPS DATA/FAX MODEM)
• Try entering the &V (View Parameters) command,
making a screen print of the diagnostics listing,
and checking for parameters that may be
unacceptable.
58
MINI-MODEM (56 KBPS DATA/FAX MODEM)
4. AT Commands, S-Registers
and Result Codes
4.1 AT Commands
AT commands are the means by which you, and your
communications software, are able to communicate
with and configure your modem. They enable you to
establish, read, and modify parameters in addition to
dialing. The following is a summary and of the AT
commands recognized by the Mini-Modem.
Command: AT Attention Code
Values: n/a
Description: The attention code precedes
all command lines except A/
and the escape sequence.
Command: ENTER or Carriage Return <CR> Key
Values: n/a
Description: Press the ENTER or Carriage
Return key to execute most
commands.
59
MINI-MODEM (56 KBPS DATA/FAX MODEM)
Command: $ Detect AT&T’s “call card”
tone
Values: n/a
Description: This symbol placed in dialing
string enables the modem to
detect
Command: A Answer
Values: n/a
Description: Answer an incoming call
before the final ring.
Command: A/ Repeat Last Command
Values: n/a
Description: Repeat the last command
string. Do not precede this
command with AT. Do not
press ENTER to execute.
Command: Bn Communication Standard
Setting
Values: n = 0 or 1
Default: 0 and 1
Description: B0 Select ITU-T
B1 Select Bell 212A when
modem is at 1200 bps.
60
MINI-MODEM (56 KBPS DATA/FAX MODEM)
Command: Ds Dial
Values: s = dial string (phone number
and dial modifiers)
Default: none
Description: Dial telephone numbers,
where s may up to 40
characters. Dial-string
modifiers:
0-9=DTMF digits 0 to 9
*=The “star” digit (tone
dialing only).
#=The “gate” digit (tone
dialing only).
A-D=A, B, C, and D DTMF
digits. Country-specific; some
countries may prohibit these
digits.
L=Redial last number. (Must
be placed immediately after
ATD.)
P=Pulse-dial following
numbers in command.
T=Tone-dial following
numbers in command
61
MINI-MODEM (56 KBPS DATA/FAX MODEM)
V=Switch to speakerphone
mode and dial the following
number. Use ATH command
to hang up.
W=Wait for a new dial tone
before continuing to dial.
(X0, X1, X3, or X4 must be
selected.)
S=Dial a telephone number
previously stored using the
&Zn=x command (see &Zn=x
command for further
information). The range of n
is 0-3.
,=Pause during dialing
for time set in register S8.
;=Return to command mode
after dialing. (Place at end
of dial string.)
!=Hook flash. Causes the
modem to go on-hook for
one-half second, then off-
hook again (time specified
in S29).
62
MINI-MODEM (56 KBPS DATA/FAX MODEM)
@=Wait for quiet answer.
Causes modem to wait for a
ringback, then 5 seconds of
silence, before processing
next part of command. If
silence is not detected, the
modem returns a NO
ANSWER code.
$=Wait for credit card dialing
tone before continuing with
the dial string (wait
contingent on S7 setting).
^=Toggles data calling tone
enable/disable: applicable to
current dial attempt.
Command: DS=n Dial Stored Telephone
Number
Values: n = 0–3
Default: none
Description: Dial a number previously
stored in directory number n
by the &Zn=x command.
Example: ATDS=3
63
MINI-MODEM (56 KBPS DATA/FAX MODEM)
Command: En Echo Command Mode
Characters
Values: n = 0 or 1
Default: 1
Description: E0 Do not echo keyboard
characters to the computer.
E1 Do echo keyboard characters
to the computer.
Command: Hn On-Hook/Off-Hook Control
Values: n = 0 or 1
Default: 0
Description: H0 Go on-hook to hang up.
H1 Go off-hook to make the
phone line busy.
Command: In Information Request
Values: n = 0–7
Default: None
Description: I0 Display product code.
Example: 33600
I1 Calculate and display ROM
checksum (e.g., “12AB”).
64
MINI-MODEM (56 KBPS DATA/FAX MODEM)
I2 Calculates the ROM checksum
and compares it to the pres-
tored checksum, displaying
OK or ERROR.
I3 Display the firmware version
and application codes.
I4 Display OEM defined
identifier string in either
binary or ASCII format.
I5 Display country code (e.g.,
“NA Ver. 1”).
I6 Display modem data-pump
model and internal code
version.
I7 Display the DAA code
resulting from MCU
interrogation of the DAA for
auto DAA recognition.
Examples: 000 for US or
Canada, 016 for Japan, 033
for Belgium, 034 for Finland,
035 for France, 037 for Italy,
038 for Netherlands, 039 for
Sweden, 040 for Switzerland,
and 041 for UK.
65
MINI-MODEM (56 KBPS DATA/FAX MODEM)
Command: Ln Monitor Speaker Volume
Values: n = 0, 1, 2, or 3
Default: 1
Description: L0 Select low volume.
L1 Select low volume.
L2 Select medium volume.
L3 Select high volume.
Command: Mn Monitor Speaker Mode
Values: n = 0, 1, 2, or 3
Default: 1
Description: M0 Speaker always off.
M1 Speaker on until carrier
signal detected.
M2 Speaker always on when
modem is off-hook.
M3 Speaker on until carrier is
detected, except while
dialing.
Command: Nn Modulation Handshake
Values: n = 0 or 1
Default: 1
Description: N0 Disables auto-mode
(automatic modulation
negotiation); uses connection
66
MINI-MODEM (56 KBPS DATA/FAX MODEM)
speed specified in S37.
(Equivalent to +MS
<automode> subparameter
to 0.)
N1 Enables auto-mode.
(Equivalent to +MS
<automode> subparameter
to 1.)
Command: On Return Online to Data Mode
Values: 0 or 1
Default: None
Description: O0 Enters on-line data mode
without a retrain. Handling
is determined by the Call
Establishment task. Typically,
if a connection is established,
this command connects the
DTE back to the remote
modem after an escape (+++).
O1 Issue a retrain and return to
online data mode.
67
MINI-MODEM (56 KBPS DATA/FAX MODEM)
Command: Qn Enable/Disable Result Codes
Values: n = 0 or 1
Default: 0
Description: Q0 Enable Result Codes.
Q1 Disable Result Codes.
Command: Sr=n Set Register Value
Values: r = S-register number; n varies
Default: None
Description: Set value of register Sr to
value of n, where n is entered
in decimal format.
Command: Sn Read/Write Register Value
Values: n, v, or ?
Default: None
Description: The modem selects an
S-Register, performs an
S-Register read or write
function, or reports the
value of an S-Register:
n establishes S-Register n
as the last accessed.
n=v sets the S-Register value.
68
MINI-MODEM (56 KBPS DATA/FAX MODEM)
n? reports the value
of S-Register n.
For example:
ATS7 establishes S7 as
the last accessed register.
AT=40 sets the contents
of the last register accessed
to 40.
ATS=20 sets the contents
of the last register accessed
to 20.
Command: Vn Terse/Verbose Result Code
Format
Values: n = 0 or 1
Default: 1
Description: V0 Displays Result Codes as digits
(terse response).
V1 Displays Result Codes as
words (verbose response).
Command: Wn Connect Message Control
Values: n = 0, 1 or 2
Default: 0
69
MINI-MODEM (56 KBPS DATA/FAX MODEM)
Description: W0 Upon connection, the
modem reports DTE speed
only (e.g., CONNECT
56000). Other responses
are disabled.
W1 Upon connection, the
modem reports the line
speed, the error correction
protocol, and the DTE speed.
Other responses are disabled.
W3 Upon connection, the
modem reports DCE speed
only (e.g., CONNECT
28800). Other responses
are disabled.
NOTE
This command controls the format of CONNECT messages.
The parameter value, if valid, is written to S31 bits 2 and 3.
The Wn command can be overridden by register S95.
Command: Xn Result Code Selection
Values: n = 0–4
Default: 4
Description: X0 Sends OK, CONNECT, RING,
NO CARRIER, ERROR and
NO ANSWER); does not
70
MINI-MODEM (56 KBPS DATA/FAX MODEM)
look for dial tone or busy
signal.
X1 Sends X0 messages and
CONNECT speed.
X2 Sends X1 messages with
NO DIALTONE.
X3 Sends X1 messages with
BUSY.
X4 Sends all responses.
NOTE
If the modem is in facsimile mode (e.g., +FCLASS=1), the only
message sent to indicate a connection is CONNECT without a
speed indication.
Command: Yn Long Space Disconnect
Values: n = 0
Default: 0
Description: Y0 Disable sending or
responding to long-space
break signal on disconnect.
Y1 Enables long-space
disconnect. In non-error-
correction mode, the modem
will send a long space of four
seconds prior to going on-
71
MINI-MODEM (56 KBPS DATA/FAX MODEM)
hook. In non-error correction
mode, the modem will
respond to the receipt of a
long space (i.e., a break signal
greater than 1.6 seconds) by
going on-hook.
Command: Zn Modem Reset
Values: n = 0 or 1
Default: None
Description: Z0 Reset modem to profile saved
by the last &W command
(profile 0).
Z1 Reset and restore stored
profile 1.
Command: &Cn Data Carrier Detect (DCD)
Control
Values: n = 0 or 1
Default: 1
Description: &C0 Ignores the state of carrier on
the remote modem; DCD
circuit is always on.
&C1 DCD turns on when the
remote modem’s carrier
72
MINI-MODEM (56 KBPS DATA/FAX MODEM)
signal is detected, and DCD is
off when the carrier signal is
not detected.
Command: &Dn Data Terminal Ready (DTR)
Control
Values: n = 0, 1, 2, or 3
Default: 2
Description: &D0 Modem ignores the true
status of the DTR signal and
responds as if it is always on.
&D1 When DTR drops while in
online data mode, the
modem enters command
mode, issues an OK, and
remains connected.
&D2 When DTR drops while in
online data mode, the
modem hangs up (Auto-
Answer is encumbered).
&D3 When DTR drops, the
modem hangs up and resets
as if an ATZ command were
issued.
73
MINI-MODEM (56 KBPS DATA/FAX MODEM)
Command: &Fn Load Factory Default Settings
Values: n = 0 or 1
Default: None
Description: &F0 Restore factory configuration
0.
&F1 Restore factory configuration
1.
Command: &Gn V.22bis Guard Tone Control
Values: n = 0, 1, or 2
Default: 0
Description: &G0 Disable guard tone.
&G1 Enable 550 Hz guard tone.
&G2 Enable 1800 Hz guard tone.
Command: &Jn Telephone Jack Control
Values: n = 0 or 1
Default: None
Description: &J0 NA
&J1 NA
NOTE
This command is only included for compatibility and
performs no function except to load the S-Register. The
parameter value, if valid, is written S21 bit 1.
74
MINI-MODEM (56 KBPS DATA/FAX MODEM)
Command: &Kn Flow Control Selection
Values: n = 0, 3, 4, 5 or 6
Defaults: 3
Description: &K0 Flow control disabled.
&K3 Enable CTS/RTS hardware
flow control.
&K4 Enable XON/XOFF flow
control.
&K5 Enable transparent
XON/XOFF flow control.
&K6 Enable both RTS/CTS and
XON/XOFF flow control.
(Default for fax and voice
modes.)
Command: &Ln Leased Line Operation
Values: n = 0
Defaults: None
Description: &L0 NA
NOTE
This command requests leased-line or dial-up operation. This
command is provided for compatibility only; no mode change
is performed, dial-up operation continues. The OK response is
returned for a valid parameter, but no other action is
performed. The parameter value, if valid, is written to S27 bit 2.
75
MINI-MODEM (56 KBPS DATA/FAX MODEM)
Command: &Mn Communications Mode
Values: n = 0
Defaults: 0
Description: &M0 Asynchronous mode.
&M1 Reserved—responds ERROR.
NOTE
&M0 selects direct asynchronous operation. Note that the
command sequence &M0\N0 selects normal buffered mode, but
the command sequence \N0&M0 selects direct mode. This is
because the \N0 command is analogous to the &Q6 command.
Command: &Qn Asynchronous
Communications Mode
Values: n = 0, 5, or 6
Defaults: 5
Description: &Q0 Asynchronous with no data
buffering/no error
correction. Same as \N0.
&Q5 Asynchronous with data
buffering/error correction.
Same as \N3.
&Q6 Asynchronous with data
buffering/no error
correction. Same as \N0.
76
MINI-MODEM (56 KBPS DATA/FAX MODEM)
Command: &Sn Data Set Ready (DSR)
Control
Values: n = 0 or 1
Default: 0
Description: &S0 Force DSR ON at all times.
&S1 DSR becomes active after
answer tone is detected (CD),
and inactive after carrier tone
is lost.
Command: &Tn Test Commands
Values: n = 0, 1, 3, 4, 5, 6, 7, or 8
Default: None
Description: &T0 Abort. Stop any test in
progress.
&T1 Starts local analog loop test.
&T2 Returns Error.
&T3 Starts local digital loopback
test.
&T4 Responds to remote modem
request for Digital Loopback.
&T5 Ignores remote modem
request for Digital Loopback.
&T6 Requests remote Digital
Loopback without self-test.
77
MINI-MODEM (56 KBPS DATA/FAX MODEM)
&T7 Requests remote Digital
Loopback with self-test.
&T8 Starts local analog loop test
with self-test.
Command: &V0 View Current Configuration
Values: n/a
Description: Displays the active modem
settings.
NOTE
Reports the current (active) configuration, the stored (user)
profiles, and the first four stored phone numbers. The stored
profiles and phone numbers are not displayed if the NVRAM
is not installed or is not operational as detected by the
NVRAM test during reset processing.
Example:
AT&V
ACTIVE PROFILE:
B0 E1 L1 M1 N1 QO T V1 W0 X4 Y0 &C0 &D0 &G2 &J0
&K3 &Q5 &R1 &S0 &T4 &X0 &Y0
S00:002 S01:000 S02:043 S03:013 S04:010 S05:008
S06:002 S07:030 S08:002 S09:006
S10:014 S11:255 S12:050 S18:000 S25:005 S26:001
S36:007 S37:000 S38:020 S46:138
S48:007 S95:000
78
MINI-MODEM (56 KBPS DATA/FAX MODEM)
STORED PROFILE 0:
B0 E1 L1 M1 N1 QO T V1 W0 X4 Y0 &C0 &D0 &G2 &J0
&K3 &Q5 &R1 &S0 &T4 &X0
S00:002 S02:043 S06:002 S07:030 S08:002 S09:006
S10:014 S11:095 S12:050 S18:000
S36:007 S37:000 S40:105 S41:003 S46:138 S95:000
STORED PROFILE 1:
B0 E1 L1 M1 N1 QO T V1 W0 X4 Y0 &C0 &D0 &G2 &J0
&K3 &Q5 &R1 &S0 &T4 &X0
S00:002 S02:043 S06:002 S07:030 S08:002 S09:006
S10:014 S11:095 S12:050 S18:000
S36:007 S37:000 S40:105 S41:003 S46:138 S95:000
TELEPHONE NUMBERS:
0 = 1 =
2 = 3 =
OK
Command: &V1 Display Last Connection
Statistics
Values: n/a
Description: Displays the last connection
statistics in the following
format (shown with typical
results):
79
MINI-MODEM (56 KBPS DATA/FAX MODEM)
TERMINATION REASON...... LINK
DISCONNECT or LOCAL REQUEST
Last TX Data Rate...... 33600 BPS
Highest TX Data Rate...... 33600 BPS
Last RX Data Rate...... 28800 BPS
Highest RX Data Rate...... 28800 BPS
Error Correction Protocol...LAPM
Data Compression..... V42Bis
Line Quality......030
Highest SPX RX state......068
Highest SPX TX state......067
Command: &Wn Store Current Configuration
Values: n = 0 or 1
Default: None
Description: &W0 Store active modem settings
in NVRAM as profile 0.
&W1 Store active modem settings
in NVRAM as profile 1.
Command: &Yn Select Stored Configuration
for Hard Reset
Values: n = 0 or 1
Default: none
Description: &Y0 Select stored configuration 0
on power-up.
80
MINI-MODEM (56 KBPS DATA/FAX MODEM)
&Y1 Select stored configuration 1
on power-up.
Command: &Zn=x Store Telephone Number
Values: n = 0, 1, 2, or 3 memory
locations
x = Dialing string
Default: None
Description: Stores telephone dial string x
in memory location n. Dial
the stored number using the
command ATDS=n.
Command: %En Monitor Line Quality and
Auto-Retrain or
Fallback/Fallforward
Values: n = 0, 1 or 2
Default: 2
Description: %E0 Disable line quality monitor
and auto-retrain.
%E1 Enable line quality monitor
and auto-retrain.
%E2 Enable line quality monitor
and fallback/fall forward.
81
MINI-MODEM (56 KBPS DATA/FAX MODEM)
Command: %L Line Signal Level
Values: none
Default: none
Description: %L Returns a value which
indicates the received signal
level. The value returned is
a direct indication (DAA-
dependent) of the receive
level at the MDP, not at the
telephone-line connector
(e.g., 009 = 9dBm, 043 = -043
dBm, etc.).
Command: %Q Line Signal Quality
Values: none
Default: none
Description: %Q Reports the line signal quality
(DAA-dependent). Returns
the higher order byte of
the EQM value. Based on the
EQM value, retrain or
fallback/fall-forward may be
initiated if enabled by %E1
or %E2.
82
MINI-MODEM (56 KBPS DATA/FAX MODEM)
For example:
AT%Q
015
Command: %7 Plug and Play Serial Number
Values: none
Default: none
Description: %7 Sets and stores eight serial
numbers in hex format for
serial Plug and Play. For
example:
AT%7 <8 hex
numbers><same 8 hex
numbers>
Command: %8 Plug and Play Vendor ID and
Product Number
Values: none
Default: none
Description: %8 Sets and stores Vendor ID
and product number for
serial Plug and Play. For
example: AT%8 <3 ASCII
characters><4 hex
numbers><3 ASCII
83
MINI-MODEM (56 KBPS DATA/FAX MODEM)
characters><same 4 hex
numbers><cr>
Command: %C Enable/Disable Data
Compression
Values: n = 0, 1, 2, or 3
Default: 3
Description: %C0 Disables Data Compression.
%C1 Enables MNP 5 data
Compression negotiation.
%C2 Enables V.42 bis data
Compression negotiation.
%C3 Enables both V.42 bis and
MNP 5 data Compression
negotiation.
Command: \An Select Maximum Block Size
Values: n = 0, 1, 2, or 3
Default: 1
Description: \A0 64-character MNP maximum
block size.
\A1 128-character MNP maximum
block size.
\A2 192-character MNP maximum
block size.
84
MINI-MODEM (56 KBPS DATA/FAX MODEM)
\A3 256-character MNP maximum
block size.
NOTE
The modem will operate an MNP error corrected link using
a maximum block size controlled by the parameter supplied.
Command: \Bn Transmit Break to Remote
Values: n =\B1-\B9
Default: \B3
Description: \B3 Break length in 100-ms units
(non-error-correction mode).
In non-error-correction
mode, the modem will
transmit a break signal to the
remote modem with a length
in multiples of 100 ms
according to parameter
specified. The command
works in conjunction with the
\K command. In error-
correction mode, the modem
will signal a break through
the active error correction
protocol, giving no indication
of the length.
85
MINI-MODEM (56 KBPS DATA/FAX MODEM)
NOTE
When the modem receives a break from the remote modem, break
is passed to the DTE as follows: In non-error-correction mode
direct, the break length is passed; in non-error-correction mode
normal and in error correction mode, a 300-ms break is passed.
Command: \Kn Set Break Control
Values: n = 0, 1, 2, 3, 4 or 5
Default: 5
Description: Controls the response of the
modem to a break received
from the DTE or the remote
modem or the \B command
according to the parameter
specified. The response is
different in three separate
command states. The first
state is where the modem
receives a break from the
DTE when the modem is
operating in data transfer
mode:
\K0 Enter on-line command
mode, no break sent to the
remote modem.
86
MINI-MODEM (56 KBPS DATA/FAX MODEM)
\K1 Clear data buffers and send
break to remote modem.
\K2 Same as \K0.
\K3 Send break to remote modem
immediately.
\K4 Same as \K0.
\K5 Send break to remote modem
in sequence with transmitted
data. The second case is
where the modem is in the
on-line command state
(waiting for AT commands)
during data connection and
the \B command is received
in order to send a break to
the remote modem:
\K0 Clear data buffers and send
break to the remote modem.
\K1 Same as \K0.
\K2 Send break to remote modem
immediately.
\K3 Same as \K2.
\K4 Send break to remote modem
in sequence with transmitted
data.
87
MINI-MODEM (56 KBPS DATA/FAX MODEM)
\K5 Same as \K4. The third case
is where a break is received
from a remote modem during
a non-error corrected
connection:
\K0 Clear data buffers and send
break to the DTE.
\K1 Same as \K0.
\K2 Send break to DTE
immediately.
\K3 Same as \K2.
\K4 Send break to DTE in
sequence with transmitted
data.
\K5 Same as \K4.
Command: \Nn Error Correction Mode
Selection
Values: n = 0–5
Default: 3
Description: \N0 Non-error-correction mode
with data buffering (same as
&Q6).
\N1 Direct mode.
88
MINI-MODEM (56 KBPS DATA/FAX MODEM)
\N2 V.42/MNP reliable mode.
\N3 Same as \N2.
\N4 V.42 reliable mode.
\N5 MNP reliable mode.
Command: \Vn Single Line Connect Message
Values: n = 0 or 1
Default: n/a
Description: \V0 Disables Single Line Connect
Message.
\V1 Enables Single Line Connect
Message, where the format is:
CONNECT, DTE
speed>,Modulation>
</Protocol></Compression>
</Line speed>.
NOTE
Connect messages are contingent on X, W, and S95 command
settings.
Command: +MS Select Modulation
Values: n/a
Default: n/a
Description: +MS= This extended-format
command selects the
89
MINI-MODEM (56 KBPS DATA/FAX MODEM)
modulation, optionally
enables or disables automode,
and optionally specifies the
lowest and highest
connection rates using one
to four subparameters
(client modem) or five
subparameters (server
modem). The command
format is:
+MS=<mod>[,[<automode>][,[<min_rate>][,
[<max_rate][,[<x_law][,[<rb_signalling>]]]]]]<cr>
The modem can send a string
of information to the DTE
consisting of selected options
when AT+MS?<cr> is entered.
The following table is a
display of subparameter
definitions:
90
MINI-MODEM (56 KBPS DATA/FAX MODEM)
Table 4-1. Subparameter Definitions.
Subparameter Definitions
<mod> Selects Modulation: Possible Rates (bps):
0 V.21 300
1 V.22 1200
2 V.22bis 2400, 1200
3 V.23 1200
9 V.32 9600, 4800
10 V.32bis 14.4K, 12K, 9.6K, 7,2K
11 V.34 33.6K, 31.2K, 28.8K,
26.4K, 24K, 19.2K,
16.8K, 14.4K, 12K,
9.6K, 7.2K, 4.8K, 2.4K
56 K56Flex 56K, 54K, 52K, 50K,
48K, 46K, 44K, 42K,
40K, 38K, 32K
(downstream speeds)
64 Bell 103 300
69 Bell 212 1200
[,[<auto-mode>] Enables/disables
automatic modulation
negotiation with remote
modem
0 Disables N0 command
Equivalent
1 Enables N0 command
Equivalent
[,[<min-rate>] See “Possible Rates
(bps)” above. Default:
300 bps
[,[<max-rate>] See “Possible Rates
(bps)” above. Default:
33600 bps
91
MINI-MODEM (56 KBPS DATA/FAX MODEM)
NOTE
Use a comma (,) to separate optional parameters. For example:
+MS=11, 1, 300, 28800 (+MS command with the default settings).
Subparameters that you do not enter remain at their current value.
Type a comma alone to skip a subparameter or carriage return to
skip the last subparameter. For example, +MS=,0,<Enter> disables
auto mode and keeps all other settings at their current value.
Command: -SDR=n Enable/Disable Distinctive
Ring
Values: -SDR=n
Default: 0
Description: -SDR=0 Disables Distinctive Ring. Any
valid ring detected is reported
as RING.
-SDR=1 Enables Distinctive Ring
Type 1.
-SDR=2 Enables Distinctive Ring
Type 2.
-SDR=3 Enables Distinctive Ring
Types 1 and 2.
-SDR=4 Enables Distinctive Ring
Type 3.
-SDR=5 Enables Distinctive Ring
Types 1 and 3.
-SDR=6 Enables Distinctive Ring
Types 2 and 3.
92
MINI-MODEM (56 KBPS DATA/FAX MODEM)
-SDR=7 Enables Distinctive Ring
Types 1, 2, and 3.
The ring types supported and the corresponding ring
cadence detect definitions are as follows:
Table 4-2. Distinctive Ring Types.
Command: )Mn This command is included
only for compatibility and
performs no function.
Command: *Hn This command is included
only for compatibility and
performs no function.
Command: -Kn MNP 10 MNP Extended
Services
Values: n = 0, 1, or 2
Distinctive Ring Type Definitions of Ring Cadence
1 2.0 sec ON, 4.0 sec OFF
2 0.8 sec ON, 0.4 sec OFF, 0.8 sec ON, 0.4 sec OFF
3 0.4 sec ON, 0.2 sec OFF, 0.4 sec ON, 0.2 sec OFF,
0.8 sec ON, 4.0 sec OFF
93
MINI-MODEM (56 KBPS DATA/FAX MODEM)
Default: 0
Description: -K0 Disables V.42 LAPM to MNP
10 conversion.
-K1 Enables V.42 LAPM to MNP
10 conversion.
-K2 LAPM answer mode detection
phase.
Command: -Qn This command is included
only for compatibility and
performs no function.
Command: -SEC=n Enable/Disable
Values: -SDR=n
Default: n/a
Description: -SEC=0 Disables MNP 10-EC
-SEC=1 Enables MNP 10-EC
-SEC=1,[<tx level>] where <tx level>
is an optional transmit-level
subparameter (transmit level
range is 0 dBm to -30dBm
and is specified by a set S 91
value).
94
MINI-MODEM (56 KBPS DATA/FAX MODEM)
Command: @Mn This command is included
only for compatibility and
performs no function.
Command: :En This command is included
only for compatibility and
performs no function.
Command: *B View Numbers in Blacklist
Values: n/a
Description: This command requests the
modem to return a list of
blacklisted numbers to the
DTE. Permanently forbidden
numbers as defined by
country requirements will
not appear on this list. If no
numbers are blacklisted, only
the OK result code is issued.
The format of the response is
shown by the example on the
next page:
No. — Phone Number
1; 6125553500
2; 2155558767
3; 2125554549
95
MINI-MODEM (56 KBPS DATA/FAX MODEM)
Command: *D View Delayed Numbers
Values: n/a
Description: This command causes the
modem to send a list of the
delayed numbers together
with the delay associated with
each. The modem will return
a list of delayed telephone
numbers as defined in the *B
command. If no numbers are
delayed, only the OK result
code is issued. The format of
the response is shown by the
example below (delay times
are shown as:
hours:minutes:seconds):
No. — Phone Number—
Delay
1; 6127853500 1:59:25
2; 2154778767 0:4:43
3; 2128724549 2:33:00
Command: #CIDn Caller ID
Values: n = 0, 1, or 3
Default: 0
96
MINI-MODEM (56 KBPS DATA/FAX MODEM)
Description: #CID=0 Disables Caller ID
#CID=1 Enables Caller ID with
formatted presentation to
the DTE. The modem will
present the data items in a
<TAG><Value> pair format.
The expected pairs are data,
time, caller code (phone
number), and name.
#CID=2 Enables Caller ID with
unformatted presentation.
The modem will present the
entire packet information,
excluding the leading U’s in
ASCII printable hex numbers.
#CID? Retrieves the current
CID modem from the
modem.
Command: P Pulse Dial
Values: n/a
Description: Pulse dial until T (Tone Dial)
Command.
97
MINI-MODEM (56 KBPS DATA/FAX MODEM)
Command: T Tone Dial
Values: n/a
Description: Tone dial until P (Pulse Dial)
Command.
Command: +++ Escape Sequence
Values: n/a
Description: Puts the modem in command
mode (and optionally issues a
command) while remaining
online. Type +++ and up to
ten command characters,
then press ENTER.
Command: &Pn Make/Break Dial Ratio
Values: 0-3
Description: &P0 Make/Break dial ratio of
39/61 10 pps
&P1 n/a
&P2 n/a
&P3 n/a
Command: AT**n Download to Flash Memory
Values: 0-2
Description: AT**0 Download speed is the last
sensed speed
98
MINI-MODEM (56 KBPS DATA/FAX MODEM)
AT**1 Download speed is 38.4 kbps
AT**1 Download speed is 57.6 kbps
NOTE
See Chapter 6 for Download to Flash Memory procedure.
4.2 S-Registers
Certain Command Mode configurations are stored in
memory registers called S-Registers. The S command is
used to assign a value to, and to read the current value
of, an S-Register. To assign a value to an S-Register,
enter the letter S, followed by the S-Register number
and an equals sign (=). To read an S-Register value,
enter the letter S followed by the S-Register number and
a question mark (?), then hit RETURN. To verify that
the S-Register value was entered correctly, enter for
example, ATS8? and hit RETURN. You should receive a
response of the assigned value given to that S-Register.
Reg. Unit Range Default Description
S0 rings 0, 1–255 1 Sets the number of
rings before the
modem answers.
ATS0=0 disables
auto-answer
completely.
99
MINI-MODEM (56 KBPS DATA/FAX MODEM)
S1 rings 0–255 0 Counts the number
of rings that have
occurred.
S2 decimal 0–255 43 (+) Sets ASCII code for
the escape character.
Values greater than
127 disable the
escape sequence.
S3 decimal 0–127 13 (^M) Sets ASCII code for
the carriage-return
character.
S4 decimal 0–127 10 (^J) Sets ASCII code
for the line-feed
character.
Reg. Unit Range Default Description
S5 decimal 0–255 8 (^H) Sets ASCII code
for the backspace
character. Values
greater than 32
disable the backspace
character.
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