Multitech MultiMobile MT5634ZLX/FE User manual

MultiMobile Modem Family
PC Card Modem
MT5634ZLX
MT5634ZLXI
MT5634ZLX/FE
User Guide

MT5634ZLX, MT5634ZLXI, MT5634ZLX/FE User Guide
MT5634ZLX, MT5634ZLXI, MT5634ZLX/FE
P/N S000266A Revision A
Copyright © 1999-2002 by Multi-Tech Systems, Inc.
All rights reserved. This publication may not be reproduced, in whole or in part, without prior expressed
written permission from Multi-Tech Systems, Inc.
Multi-Tech Systems, Inc. makes no representations or warranties with respect to the contents hereof and
specifically disclaims any implied warranties of merchantability or fitness for any particular purpose.
Furthermore, Multi-Tech Systems, Inc. reserves the right to revise this publication and to make changes
in the content hereof without obligation of Multi-Tech Systems, Inc. to notify any person or organization of
such revisions or changes.
Revision Date Description
A 08/07/02 MT5634ZLX MultiMobile Family User Guide initial release.
Patents
4,453,450; 4,603,320; 4,686,506; 4,972,470
Trademarks
MultiMobile and the Multi-Tech logo are trademarks of Multi-Tech Systems, Inc.
Adobe and Acrobat are trademarks of Adobe Systems Incorporated. Microsoft, Windows is either a
registered trademark of Microsoft Corporation in the United States and/or other countries. All other brands
and product names mentioned in this publication are registered trademarks of their respective companies.
World Headquarters
Multi-Tech Systems, Inc.
2205 Woodale Drive
Mounds View, MN 55112
U.S.A
Telephone [phone] or [phone]
Fax [phone]
Internet http://www.multitech.com
Technical Support
Country By Email By Phone
France [e-mail] +(33) 1-64 61 09 81
India [e-mail] [phone]
U.K. [e-mail] +(44) 118 959 7774
U.S. and Canada [e-mail] (800) 972 -2439
Rest of the World [e-mail] +[phone]
Note the status of the modem before contacting Technical Support. The status can include information
about LED indicators, screen messages, diagnostics test results, problems with an application, etc.
Recording Your Modem Information
Record the following information about your Multi-Tech modem before calling Technical Support.
Modem Model Number:
Modem Serial Number:
These numbers are printed on the bottom of the modem.

MT5634ZLX, MT5634ZLXI, MT5634ZLX/FE User Guide
Contents
ContentsContents
Contents
CHAPTER 1 – INTRODUCTION ..................................................................................................................5
FEATURES...................................................................................................................................................5
SYSTEM REQUIREMENTS.............................................................................................................................. 6
SAFETY WARNINGS...................................................................................................................................... 6
WE SUPPLY.................................................................................................................................................7
CHAPTER 2 – INSTALLATION ...................................................................................................................8
INSTALLING THE MT5634ZLX CARD............................................................................................................. 8
INSTALLING THE MT5634ZLXI CARD............................................................................................................ 8
INSTALLING THE MT5634ZLX/FE CARD .......................................................................................................9
INSTALLING THE MODEM DRIVER ................................................................................................................10
Modem Driver Installation for Windows 95/98/Me/2000/XP ................................................................ 10
Modem Driver Installation for Windows NT .........................................................................................10
INSTALLING DATA COMMUNICATION SOFTWARE ..........................................................................................11
IMPORTANT: HOW TO EJECT THE PC CARD ................................................................................................11
CONFIGURE THE MODEM FOR YOUR COUNTRY ...........................................................................................11
Using the Global Wizard to Configure Your Modem............................................................................11
Using AT Commands to Configure Your Modem ................................................................................12
DIAL-UP NETWORKING............................................................................................................................... 12
CHAPTER 3 – REMOTE CONFIGURATION............................................................................................. 13
Basic Procedure................................................................................................................................... 13
Setup....................................................................................................................................................13
CHAPTER 4 – AT COMMANDS, S-REGISTERS, AND RESULT CODES...............................................15
AT COMMANDS .........................................................................................................................................16
S-REGISTERS (ATSN=X)............................................................................................................................21
RESULT CODES .........................................................................................................................................24
CHAPTER 5 – TROUBLESHOOTING .......................................................................................................26
No Response to AT Commands .......................................................................................................... 26
The Modem Does Not Execute the Command Line ............................................................................ 26
The Modem Does Not Give a Response After an Executed AT Command........................................ 26
The Modem Gives an ‘ERROR’ Response After an Executed AT Command ....................................26
The Modem Goes Off-Hook and Disables the Telephone Line........................................................... 26
The Modem Does Not Auto-Answer the Phone................................................................................... 26
The Software Does Not Control the Modem Properly or Cannot Detect the Modem.......................... 27
Doubled Characters on the Screen .....................................................................................................27
No Text Appears on the Screen in Data Mode.................................................................................... 27
No Text Appears on the Screen When in Command Mode ................................................................27
The Modem Does Not Dial a Phone Number After AT Dial Command Execution.............................. 27
Communications Software Dials, But Fails.......................................................................................... 27
The Modem Connects with Some Modems, But Not Others............................................................... 27
When Dialing Another Modem, a CONNECT Response Is Received, But Nothing Else....................28
The Modem Speaker Does Not Make Any Sound When Connecting to Another Modem ..................28
Occasionally, the Modem Gives a Burst of Errors............................................................................... 28
Transmitted Data Random Errors........................................................................................................28
After Downloading a File, the File Does Not Store on the Disk Drive .................................................28
The Text on the Screen Is Not Legible ................................................................................................ 28
When Using V.42bis or MNP5, Some Features Are Disabled............................................................. 29
When Connecting to Another Modem, the Modem Reports a Higher Baud Rate Than It’s Really
Using....................................................................................................................................................29
COM Port and IRQ Conflicts................................................................................................................29

MT5634ZLX, MT5634ZLXI, MT5634ZLX/FE User Guide
APPENDIX A – REGULATORY COMPLIANCE........................................................................................30
FCC PART 15 REGULATION.......................................................................................................................30
FCC PART 68 TELECOM............................................................................................................................ 31
CANADIAN LIMITATIONS NOTICE..................................................................................................................32
MT5634ZLXI, MT5634ZLX/FE MODEM RESTRICTIONS.............................................................................32
EMC, SAFETY, AND R&TTE DIRECTIVE COMPLIANCE.................................................................................32
NEW ZEALAND TELECOM WARNING NOTICE................................................................................................33
SOUTH AFRICAN STATEMENT .....................................................................................................................33
APPENDIX B – GLOBAL WIZARD............................................................................................................34
USING THE GLOBAL WIZARD.......................................................................................................................34
APPENDIX C – FLASH WIZARD...............................................................................................................36
UPGRADE PROCEDURES ............................................................................................................................36
Overview ..............................................................................................................................................36
Step 1: Identify the Modem’s Model Number and Firmware Version .................................................. 36
Step 2: Identify the Current Version of the Firmware ..........................................................................37
Step 3: Download the Upgrade File..................................................................................................... 37
Step 4: Install the Flash Wizard ...........................................................................................................37
Step 5: Extract the Firmware Upgrade (.HEX) File..............................................................................37
Step 6: Document and Clear Your Stored Parameters ....................................................................... 38
Step 7: Upgrade the Modem’s Firmware.............................................................................................38
APPENDIX D – TECHNICAL SPECIFICATIONS......................................................................................39
APPENDIX E – MULTI-TECH SYSTEMS, INC. WARRANTY & REPAIRS POLICIES............................40
WARRANTY................................................................................................................................................40
REPAIR PROCEDURES FOR U.S. AND CANADIAN CUSTOMERS...................................................................... 40
INDEX .........................................................................................................................................................42

Chapter 1 – Introduction
MT5634ZLX, MT5634ZLXI, MT5634ZLX/FE User Guide 5
Chapter 1 – Introduction
Chapter 1 – IntroductionChapter 1 – Introduction
Chapter 1 – Introduction
The MultiMobile PC Card modems offer high-speed performance and reliability for mobile users with
laptops. They provide the flexibility needed for local and remote connections to the Internet. These Type II
PCMCIA credit card size modems comply with the PCMCIA 2.1 and JEIDA 4.1 standards and support the
fastest downloading speeds available over standard phone lines.
They are Bell, ITU-T and AT command compatible, allowing them to be used worldwide (except for the
ZLX which is limited to the United States and Canada) with today’s popular communication software
programs. You can send and receive faxes with any Group 3 compatible fax device.
•The MT5634ZLX is designed for use in the United States and Canada.
•The MT5634ZLXI is designed for use worldwide. See the Multi-Tech Web site at
http://www.multitech.com for a list of approved countries.
•The MT5634ZLX/FE is designed for use in the United States, Canada, and Europe. It can
connect to an enterprise LAN as well as the Internet.
The MultiMobile PC Cards are fax/modem communications devices that perform the following
communications tasks:
•provide V.90 compatibility for data transmission speeds up to 56 Kbps, while maintaining
compatibility with lower-speed modems.
•send and receive faxes from computers or fax machines
.
Features
FeaturesFeatures
Features
•Compatible with most notebook PCs
•Provides easy installation with Plug-and-Play operation under Windows 98/Me/2000/XP (modem
installation under Windows NT is not Plug-and-Play)
•Hot swappable
•Includes data communications, fax and other value-added software
•Low Power when idle
•Flash memory for easy updates
•Class 1 and Class 2 faxing
•Speed buffering
•Automatic format/speed sensing
•Additional Features of MT5634ZLX/FE
•10 or 100 Mbps Ethernet data rate auto-negotiation (10/100M auto-negotiation)
•Ethernet full-duplex mode that doubles the network connection speed
•Concurrent use of Fast Ethernet LAN and fax/modem operation
•Configures easily with a global installation wizard (both MT5634ZLX/FE and MT5634ZLXI support
the globabl wizard).
.

Chapter 1 – Introduction
MT5634ZLX, MT5634ZLXI, MT5634ZLX/FE User Guide 6
System Requirements
System RequirementsSystem Requirements
System Requirements
•An IBM compatible PC or notebook computer with 386SX or faster processor
•At least one type II PCMCIA socket or 32-bit CardBus slot
•PCMCIA compliant Card Services and Socket Services
•An RJ-11 jack for connecting to a phone plug
•MT5634ZLX/FE only: An RJ-45 jack for 100BaseTX connection to your Ethernet LAN
Safety Warnings
Safety WarningsSafety Warnings
Safety Warnings
•Use this product only with UL- and CUL-listed computers.
•To reduce the risk of fire, use only 26 AWG (.41mm) or larger telephone wiring.
•Never install telephone wiring during a lightning storm.
•Never install a telephone jack in a wet location unless the jack is specifically designed for wet
locations.
•Never touch uninsulated telephone wires or terminals unless the telephone line has been
disconnected at the network interface.
•Use caution when installing or modifying telephone lines.
•Avoid using a telephone during an electrical storm; there is a risk of electrical shock from lightning.
•Do not use a telephone in the vicinity of a gas leak.

Chapter 1 – Introduction
MT5634ZLX, MT5634ZLXI, MT5634ZLX/FE User Guide 7
We Supply
We SupplyWe Supply
We Supply
Your modem has several components. Please make sure you have all parts before trying to operate your
modem.
MT5634ZLX MT5634ZLXI MT5634ZLX/FE
MT5634ZLX, MT5634ZLXI
MultiMobile PC Card modem
MT5634ZLX/FE
MultiMobile PC Card modem
Quick Start Guide
MultiMobile PC Card CD that provides modem drivers, the User Guide, a data
communications software program, and Acrobat Reader
MT5634ZLX MT5634ZLXI MT5634ZLX/FE
RJ-11 adapter cable RJ-11 telephone cord RJ-11 telephone cord
One Modem-LAM (Line
Adapter Modules) Two LAMs (Line Adapter Modules)
One Modem-LAM
One Ethernet-LAM

Chapter 2 – Installation
MT5634ZLX, MT5634ZLXI, MT5634ZLX/FE User Guide 8
Chapter 2 – Installation
Chapter 2 – InstallationChapter 2 – Installation
Chapter 2 – Installation
Installing the MT5634ZLX Card
Installing the MT5634ZLX CardInstalling the MT5634ZLX Card
Installing the MT5634ZLX Card
1. Insert the MT5634ZLX Card into the laptop’s PCMCIA slot. Be sure the label is facing up.
2. Plug 15-pin adapter end of the telephone cord into the MT5634ZLX Card.
3. Plug the other end of the RJ-11 into an available telephone wall jack. This connects you to the PSTN
(Public Switched Telephone Network).
MT5634ZLX Connections
Installing the MT5634ZLXI Card
Installing the MT5634ZLXI CardInstalling the MT5634ZLXI Card
Installing the MT5634ZLXI Card
1. Insert the MT5634ZLXI Card into the laptop’s PCMCIA slot. Be sure the label is facing up.
2. Plug the Modem-LAM (Line Adapter Module) into the modem port of the PC Card.
3. Plug one end of the RJ-11 telephone line cord into the open end of the Modem-LAM (this is the
LAM’s RJ-11 receptacle side).
4. Plug the other end of the RJ-11 into an available telephone wall jack. This connects you to the PSTN
(Public Switched Telephone Network).
5. With your PC turned on, verify the operation of the LEDs.
OH (Off-Hook) light on means the MT5634ZLXI is dialing, is online, or answering a call.
CD (Carrier Detect) light on means a valid carrier signal from another modem is detected.
RD (Receive Data) light flashes when data is being received.
TD (Transmit Data) light flashes when data is being transmitted.
MT5634ZLXI Connections

Chapter 2 – Installation
MT5634ZLX, MT5634ZLXI, MT5634ZLX/FE User Guide 9
Installing the MT5634ZLX/FE Card
Installing the MT5634ZLX/FE CardInstalling the MT5634ZLX/FE Card
Installing the MT5634ZLX/FE Card
1. Insert the MT5634ZLX/FE Card into the computer’s PCMCIA slot. Be sure the label is facing up.
2. Plug the Modem-LAM (Line Adapter Module) into the modem port of the PC Card.
3. Plug one end of the RJ-11 telephone line cord into the open end of the Modem-LAM (this is the
LAM’s RJ-11 receptacle side).
4. Plug the other end of the RJ-11 into an available telephone wall jack. This connects you to the PSTN
(Public Switched Telephone Network).
5. Plug the Ethernet-LAM into the Ethernet port of the PC Card.
6. Plug one end of either a UTP or an STP cable into the Ethernet-LAM.
7. Plug the other end of the UTP/STP cable into the Ethernet LAN.
8. Installation of the driver for the MT5634ZLE/FE: When prompted for drivers, choose the Advanced
path and browse to the Drivers_FE folder and then to the appropriate subfolder for your Windows
version.
9. With your PC turned on, verify the operation of the LEDs.
Modem LAM LEDs
OH (Off-Hook) light on means the MT5634ZLXI is dialing, is online, or answering a call.
CD (Carrier Detect) light on means a valid carrier signal from another modem is detected.
RD (Receive Data) light flashes when data is being received.
TD (Transmit Data) light flashes when data is being transmitted.
Ethernet LAM LEDs
ACT light on means there’s activity on the line.
10/100 light on means 100m; 10/100 light off means 10m.
Link light on means the line is active.
MT5634ZLX/FE Connections

Chapter 2 – Installation
MT5634ZLX, MT5634ZLXI, MT5634ZLX/FE User Guide 10
Installing the Modem Driver
Installing the Modem DriverInstalling the Modem Driver
Installing the Modem Driver
You must install the modem’s driver onto the hard drive of your laptop PC. If you are using Windows
95/98/Me/2000/XP, the driver is installed with Windows’ Plug and Play feature. For Windows NT, which
does not support Plug and Play, see the Modem Driver Installation for Windows NT below.
Modem Driver Installation for Windows 95/98/Me/2000/XP
1. Make sure your modem PC card is connected properly, and then turn on your laptop PC. Windows
should detect your new modem and open the install New Modem wizard.
Note: If Windows cannot find a modem, your modem may not be connected properly. Check your
connections.
2. Insert the MT5634ZLX Modem Family CD into your laptop PC’s CD-ROM drive, and then click OK.
3. Windows installs the modem driver.
4. Installing the ZLX/FE drivers requires you to select the Advanced option. Then browse the Drivers_FE
folder and select the appropriate subfolder.
5. Click Finish to exit.
Modem Driver Installation for Windows NT
1. Make sure your modem PC card is connected properly, and then turn on your laptop PC. Windows
should detect your new modem and open the install New Modem wizard.
Note: If Windows cannot find a modem, your modem may not be connected properly. Check your
connections.
2. In the Install New Modem wizard, select Don’t detect my modem; I will select it from a list, and then
click Next.
3. Insert the MT5634ZLX CD into your laptop PC’s CD-ROM drive, and then click Have Disk.
4. In the Install from Disk dialog box, select the drive that the CD is in, and then click OK.
5. A list of modems appears. Select your modem and click Next.
6. Select the port that the modem is connected to, and then click Next.
7. Windows installs and configures the modem driver.
8. Click Finish to exit.

Chapter 2 – Installation
MT5634ZLX, MT5634ZLXI, MT5634ZLX/FE User Guide 11
Installing Data Communication Software
Installing Data Communication SoftwareInstalling Data Communication Software
Installing Data Communication Software
Data communications software is designed to enable your modem to send and receive data. Multi-Tech
has included a communications software program, Phone Tools, with your modem. To install Phone
Tools:
•Insert the MultiMobile CD into your laptop’s CD-ROM drive.
•Click on the Phone Tools icon.
•You will be asked to choose your language.
•The software automatically loads onto your PC.
Important: How to Eject the PC Card
Important: How to Eject the PC CardImportant: How to Eject the PC Card
Important: How to Eject the PC Card
The PC Card is a hot-swappable card. However, when MT5634ZLX/FE is connected to a LAN and
transferring data, it is recommended that you use the following steps to eject the PC Card if you choose to
do so during this process. Removing the PC Card during this process without using these steps could
cause Windows to lock up.
1. On the task bar, click the PCMCIA icon.
2. Select Stop MultiMobile MT5634ZLX PCMCIA.
3. The Safe to Remove Hardware dialog box displays. Click OK.
4. Eject the PCMCIA adapter.
Configure the Modem for Your Country
Configure the Modem for Your CountryConfigure the Modem for Your Country
Configure the Modem for Your Country
Note: Country configuration applies to the MT5634ZLXI is designed for use worldwide.
Different countries have different requirements for how modems must function. Therefore, before you use
your modem, you must configure it to match the defaults of the country in which you are using it. You can
use one of two configuration methods:
•Using the Global Wizard to Configure Your Modem
•Using AT Commands to Configure Your Modem
Using the Global Wizard to Configure Your Modem
The Global Wizard configuration utility is recommended for computers running in Windows.
1. Insert the MT5634ZLX CD into the CD-ROM drive. The Autorun dialog box appears.
2. Click Initial Setup and Country Selection.
3. Choose either:
•Run Global Wizard from CD. This option will not load the wizard onto your hard drive, or
•Install Global Wizard on the HD. This option installs the wizard onto your hard drive.
4. The Global Wizard dialog box appears. Click Next.
5. The Global Wizard searches for your modem and identifies it. Click Next.
6. Select the country in which the modem will be used, and then click Next.
7. Review your choice of country. If it is correct, click Next to configure the modem.
8. When Global Wizard announces that the parameters have been set, click Finish to exit.

Chapter 2 – Installation
MT5634ZLX, MT5634ZLXI, MT5634ZLX/FE User Guide 12
Using AT Commands to Configure Your Modem
1. Run Phone Tools or use your favorite communications program and open the program’s terminal
window.
2. To configure the modem for a specific country, type AT%T19,0,nn,where nn is the country code, and
then press Enter. The message OK displays.
3. To verify the change, type ATI9, and then press Enter. The country code is displayed, as in this
example:
Country AT Command Result code
Euro/NAM AT%T19,0,34 (default) 52
4. The complete list of country codes can be found on the Multi-Tech Web site at
http://www.multitech.com/GlobalModem/config.
Dial-Up Networking
Dial-Up NetworkingDial-Up Networking
Dial-Up Networking
Before you can connect to the Internet, you must set up a remote-node client program, known as Dial-Up
Networking in Windows. Dial-Up Networking establishes your connection to your ISP’s (Internet Service
Provider) server, which is the shared computer that manages calls from clients (your computer and other
clients’ computers) to the Internet. Most, if not all, Windows browsers start Dial-Up Networking
automatically when you open them after you have setup your PC for Dial-Up Networking.
Many ISPs provide a program that will install and configure Dial-Up Networking automatically for you. If
this program was not provided, contact your ISP for instructions. You can also find Dial-Up Networking
information in your Windows operating system online help or printed documentation.

Chapter 3 – Remote Configuration
MT5634ZLX, MT5634ZLXI, MT5634ZLX/FE User Guide 13
Chapter 3 – Remote Configuration
Chapter 3 – Remote ConfigurationChapter 3 – Remote Configuration
Chapter 3 – Remote Configuration
Remote configuration is a network management tool that allows you to configure modems anywhere in
your network from one location. With password-protected remote configuration, you can issue AT
commands to a remote MultiMobile Modem for maintenance or troubleshooting as if you were on-site.
Basic Procedure
The following steps are valid regardless of whether the connection is established by the local or the
remote Multi-Tech modem.
1. Establish a data connection with a remote MultiMobile Modem.
2. Send three remote configuration escape characters followed by AT and the setup password, and
press Enter. Example: %%%ATMTSMODEM. You have four tries to enter the correct password
before being disconnected. If the password is correct, the remote modem responds with OK.
3. You can now send AT commands to configure the remote modem.
4. When you have finished configuring the remote modem, save the new configuration by typing
AT&W0 and pressing Enter.
5. Type ATO and press Enter to exit remote configuration. You can now break the connection in the
normal way.
Setup
Multi-Tech modems are shipped with a default setup password (MTSMODEM). Because anyone who has
the User Guide knows the default setup password, you should change the password and possibly also
the remote configuration escape character.
Changing the Setup Password
1. Open a data communications program such as HyperTerminal.
2. In the terminal window, type AT#SMTSMODEM (or AT#Syyyyyy if you have replaced the MTSMODEM
password with yyyyyy) and press Enter. The modem responds with OK if the setup password is
correct and ERROR if it is wrong.
3. To change the password, type AT#S=yyyyyy, where yyyyyy stands for the password, and press Enter.
The password can include any keyboard character and can be up to eight characters long. The
modem responds with OK.
4. The new password is saved automatically. You can now either enter more AT commands or exit the
data communications program. The next time you remotely configure the modem you must use the
new setup password.
Caution: You can only change the setup password locally; you cannot do it remotely. Also,
passwords are case sensitive. The next time you enter the password, it must be in the same case as
you set it up.

Chapter 3 – Remote Configuration
MT5634ZLX, MT5634ZLXI, MT5634ZLX/FE User Guide 14
Changing the Remote Escape Character
To further improve security, you can change a remote modem’s remote configuration escape character.
The remote configuration escape character is stored in register S9. The factory default is 37, which is the
ASCII code for the percent character (%). Setting S9 to 0 (zero) disables remote configuration entirely.
Caution: If you do this remotely, you won’t be able to change it back remotely!
1. Establish a remote configuration link with the remote modem as described in Basic Procedure.
2. Note: This command can be executed locally as well as remotely.
3. Type ATS9=n, where nis the ASCII code for the new remote configuration escape character, then
press Enter.
4. Save the new value by typing AT&W and pressing Enter.
5. Type ATO and press Enter to exit remote configuration.

Chapter 4 – AT Commands, S-Registers, and Result Codes
MT5634ZLX, MT5634ZLXI, MT5634ZLX/FE User Guide 15
Chapter 4 – AT Commands, S-Registers, and
Chapter 4 – AT Commands, S-Registers, andChapter 4 – AT Commands, S-Registers, and
Chapter 4 – AT Commands, S-Registers, and
Result Codes
Result CodesResult Codes
Result Codes
Typically, your fax and data communications software controls the modem for you. For complete control
over your modem, you may also want to use AT commands. Each AT command must be preceded by the
characters AT to get the ATtention of the modem. You need to be careful when using these commands
because they can cause your software to lose its ability to control the modem. If an AT command you’ve
entered has caused a problem, turn the computer off and then back on to reset the modem to factory
default settings. You may also reset the factory defaults by typing AT&F&WZ.
The format for entering an AT command is ATXn, where Xis the command and nis the value for the
command, sometimes called the command parameter. The value is always a number. If the value is zero,
you can omit it from the command; (e.g. AT&W is equivalent to AT&W0). Most commands have a default
value, which is the value that is set at the factory. The default values are included in the AT Commands
section which follows. You must press Enter to send the command to the modem.
To send AT commands to the modem you must use a communications program, such as HyperTerminal,
which is included in Windows 95, 98, NT and 2000. You can issue commands to the modem directly by
typing them in the terminal window of the communications program or indirectly by configuring the
communications program to send the command automatically. If you are using Windows Dial-Up
Networking, AT commands can be included in the connection properties (described later in this chapter).
You can issue several commands in one line; this is called a command string. A command string begins
with AT and ends when you press Enter. Spaces separating the commands are optional; they are
ignored by the command interpreter. The most familiar command string is the initialization string (used to
configure the modem when it is turned off, reset, or when your communications software initiates a call to
another modem).
To use an AT command, you must first:
1. Run your communication software.
2. Configure the software for the appropriate COM port and IRQ settings, if necessary.
3. Enter Terminal mode (also known as Command mode, Local mode, or Direct mode). This is the
mode in which most data communications software packages start up. You can then type the desired
AT command and press the Enter key.
For example, type:
ATH0<Enter> to hang up the modem connection, or
AT&K3<Enter> to enable bi-directional CTS/RTS hardware flow control.
Most of the AT commands can be entered in “strings” (i.e., on the same command line) without spaces
between the individual commands.
For example: AT&K3H0<Enter>
Any time the modem receives a command, it sends a response known as a Result Code. The most
common result codes are OK,ERROR, and CONNECT.
Fortunately, communication programs make daily operation of modems effortless by hiding the
commands from the user. Most users, therefore need to use AT commands only when reconfiguring the
modem, e.g., to turn autoanswer on or off.

Chapter 4 – AT Commands, S-Registers, and Result Codes
MT5634ZLX, MT5634ZLXI, MT5634ZLX/FE User Guide 16
AT Commands
AT CommandsAT Commands
AT Commands
The commands labeled as default are factory default settings.
Command Options Function & Description
+++AT Escape Sequence puts the modem in command mode (and optionally
issues a command) while remaining online. Type +++AT and up to ten
command characters, then press ENTER. Used mostly to issue the
hang-up command: +++ATH <cr>
%%%AT Remote Configuration Escape Sequence initiates remote configuration
mode while online with a remote modem. The remote configuration
escape character (%) is defined in register S13.
A/ Re-execute the last command string.
<any key> Terminate the current connection attempt when entered in handshaking
state.
All the following commands require an AT prefix
$Calling Card “Bong” Detection.
AGo off-hook and attempt to establish a connection without waiting for a
ring.
BnLine modulation options.
B0 Select ITU-T V.22 mode for 1200 bps connection and V.21 mode for 300
bps.
B1 (default) Select Bell 212A for 1200 bps connection; Bell 103 for 300 bps.
B2 Select V.23 1200 bps for receiving, 75 bps for transmitting in originate
mode; 75 bps for receiving and 1200 bps for transmitting in answer
mode.
B3 Select V.23 75 bps for receiving, 1200 bps for transmitting in originate
mode; 1200 bps for receiving and 75 bps for transmitting in answer
mode.
DnDial command, beginning the dialing sequence. The string “n” (telephone
number and modifiers) listed as follows is entered after the “D”
command.
PPulse dial. Only digits 0 to 9 can be dialed.
RReverse dial. Originate call in answer mode (go on-line in answer mode).
SnDial the phone number stored in NVRAM at location n(n=0, 1, 2, 3).
TDTMF tone dial. Any digit 0 to 9, *, #, A, B, C… maybe dialed as a tone.
WWait for second dial tone. The modem waits for the second dial tone
before processing the dial string.
, Pause. Causes the modem to pause for a time before processing the dial
string (value set by S8 register).
! Flash hook (for call transfer). Causes the modem to go on-hook for 0.5
second then return off-hook.
@Wait for 5 seconds of silence after dialing a number.

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MT5634ZLX, MT5634ZLXI, MT5634ZLX/FE User Guide 17
Command Options Function & Description
; Return to command state after dialing a number without disconnecting
the call.
EnAT command echo options.
E0 Echo disabled.
E1 (default) Echo enabled.
HnSwitch-hook control .
H0 Modem goes on-hook.
H1 Modem goes off-hook.
LnSpeaker Volume Control Level (0-3); L3 being the highest.
MnSpeaker control.
M0 Speaker always off.
M1 (default) Speaker on until carrier present.
M2 Speaker always on.
M3 Speaker off during dialing and on until carrier present.
NnSelect negotiate handshake.
N0 When originating or answering, handshake only at the communication
rate specified by the S37 register and “ATBn” and no fallback.
N1 (default) When originating or answering, start handshaking only at the comm
standard specified by S37 register and “ATBn”. During handshake,
fallback to a lower speed may occur except in “AT\N1” mode.
OnGo on-line.
O0 Return modem to a previously established state.
O1 Begin an equalizer retrain sequence, then return to on-line state.
O3 to O14 Force modem to a new rate that is user defined. New rates are defined in
S62 register.
PEnable pulse dialing.
QnResult code display options.
Q0 (default) Result code enabled.
Q1 Result code disabled.
TEnable tone dialing.
VnResult code form.
V0 Display result code in numeric form (see also the result code options
table).
V1 (default) Display result code in verbose form.
WnSelect extended result codes.
W0 (default) CONNECT result code reports DTE speed. (See also the “Result Code
Options Table”)

Chapter 4 – AT Commands, S-Registers, and Result Codes
MT5634ZLX, MT5634ZLXI, MT5634ZLX/FE User Guide 18
Command Options Function & Description
W1 CONNECT result code reports DTE speed; enable the CARRIER,
COMPRESSION, and PROTOCOL extended result code.
W2 CONNECT result code reports DCE speed.
XnSelect result codes/call progress options.
X0 Display CONNECT or “1” for all speeds.
X1 Display connect message according to “ATW” and “AT\V”, blind dial,
ignore busy tone.
X2 Display connect message according to “ATW” and “AT\V”, wait for dial
tone, ignore busy tone.
X3 Display connect message according to “ATW” and “AT\V”, blind dial,
check busy tone after dialing.
X4 (default) Display connect message according to “ATW” and “AT\V”, wait for dial
tone, check busy tone after dialing.
ZnRecall stored profile.
Z0 Reset and recall user profile 0.
Z1 Reset and recall user profile 1.
&CnData carrier detect option.
&C0 State of carrier from remote modem is ignored. RLSD (Receive Line
Signal Detect) circuit is always on.
&C1 (default) State of carrier from remote modem is tracked. RLSD circuit reflects the
state of carrier.
&DnData Terminal Ready (DTR) option
&D0 DTR ignored.
&D1 Go to command mode on on-to-off DTR transition.
&D2 (default) Hang up and go to command mode on on-to-off DTR transition. Auto-
answer is disabled if DTR is low.
&D3 Hang up and reset from user profile 0 on on-to-off DTR transition.
&F Recall factory default setting as active configuration.
&GnGuard tone option.
&G0 (default) No guard tone.
&G1 550 Hz guard tone.
&G2 1800 Hz guard tone.
&JnDummy command for AutoSync compatibility.
&KnSet flow control.
&K0 Disable flow control.
&K3 (default) Enable bi-directional hardware flow control (CTS/RTS).
&K4 Enable bi-directional software flow control (XON/XOFF).
&Pn Dial Pulse make/break ratio.

Chapter 4 – AT Commands, S-Registers, and Result Codes
MT5634ZLX, MT5634ZLXI, MT5634ZLX/FE User Guide 19
Command Options Function & Description
&P0 (default) Make=40%, Break=60% for use in North America.
&P1 Make=33%, Break=67% for International use.
&Rn CTS/RTS option (for non-CTS flow control mode and synchronous mode
only).
&R0 (default) CTS follows RTS.
&R1 CTS always true.
&Sn Data Set Ready (DSR) option.
&S0 (default) DSR always on.
&S1 DSR on during handshake and on-line, off in test mode or idle mode.
&Tn Self-test commands.
&T0 (then ^ATO) Terminate test.
&T1 Local analog loopback test.
&T3 Local activated remote digital loopback (RDL) test.
&Vn View active configuration and stored profile.
&V0 View active file, stored profile #0 and stored phone numbers.
&Wn Store active profile.
&W0 Save active configuration as user profile #0.
&W1 Save active configuration as user profile #1.
&Yn Select stored profile on power-up.
&Y0 Recall user profile 0 on power-up.
&Zn=x Store telephone number n=0 to 3.
x=<string> See also the dial modifier in ”ATDn” command. The maximum number of
digits per string is 36.
%A Adaptive Answer Result Code Enable.
%Cn Data compression option.
%C0 No compression.
%C1 (default) MNP 5 compression.
\Gn Set modem port flow control.
\G0 (default) Disable port flow control.
\G1 Set port flow control to XON/XOFF.
\Jn Constant DTE speed option.
\J0 (default) DCE and DTE rates are independent.
\J1 DTE rate adjusts to DCE connection rate after on-line.

Chapter 4 – AT Commands, S-Registers, and Result Codes
MT5634ZLX, MT5634ZLXI, MT5634ZLX/FE User Guide 20
Command Options Function & Description
\K=n Set break control. In on-line data state with V.42 protocol or normal
mode, then break signal to DTE through RS-232.
n=0 or 2 or 4 Enter on-line command state but do not send break to the remote
modem.
n=1 Empty the data buffers; send break to remote modem immediately.
n=3 Send break to the remote modem immediately.
n=5 Send break to the remote modem in sequence with data in on-line data
state with direct mode, then receive break signal at serial port.
n=0 or 2 or 4 Immediately send break and enter on-line command state.
n=1 or 3 or 5 Immediately send break through. In on-line command state with V.42
protocol or normal mode, the DTE issues a transmit break command.
n=0 or 1 Empty the data buffers; send the break to remote modem.
n=2 or 3 Send break to the remote modem immediately.
n=4 or 5 Send break to the remote modem in sequence with data. In on-line data
state with normal mode, receive break signal from remote at modem
port, send to serial port.
n=0 or 1 Empty the data buffers; send the break to the local DTE.
n=2 or 3 Send break to local DTE immediately.
n=4 or 5 Send break to the local DTE in sequence with data.
\NnModem protocol options.
\N0 Normal mode. No protocol, but flow control is allowed.
\N1 Direct mode. No protocol and no flow control are allowed.
\N2 MNP reliable mode.
\N3 (default) LAPM, MNP or normal mode.
\N4 LAPM or MNP mode.
\Qn DTE flow control options.
\Q0 Disable flow control .
\Q1 XON/XOFF software flow control.
\Q2 CTS flow control to DTE.
\Q3 RTS/CTS hardware flow control.
\TnSet inactive timer.
n=0 (default) Disable inactive timer.
n=1 - 90 Enable inactive timer. Length in minutes.
\Vn Protocol result codes.
\V0 (default) Disable protocol result code (e.g. CONNECT 9600).
\V1 Enable protocol result code (e.g. CONNECT 9600/LAP-M).
\XnXON/XOFF pass-through options.
\X0 (default) Process XON/XOFF per AT\Gn and AT\Qn option, if XON/XOFF flow
control enabled, do not pass XON/XOFF to remote modem or local DTE.
\X1 Process XON/XOFF per AT\Gn and AT\Qn option, always pass
XON/XOFF to the remote modem or local DTE.