Multitech MultiModem MT3334ZDX, MultiModem MT3334ZDXV Owner's Manual
Models MT3334ZDX
and MT3334ZDXV
Data/Fax Modem
Data/Fax/Voice Modem
Owner's Manual (User Guide)
User Guide
S000343A Revision A
Models MT3334ZDX and MT3334ZDXV
This publication may not be reproduced, in whole or in part, without prior
expressed written permission from Multi-Tech Systems, Inc.
All rights reserved.
Copyright © 1997-2004, by 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 from time to time in the content hereof
without obligation of Multi-Tech Systems, Inc. to notify any person or
organization of such revisions or changes.
Patents
This Product is covered by one or more of the following U.S. Patent Numbers:
5.301.274; 5.309.562; 5.355.365; 5.355.653; 5.452.289; 5.453.986; 5,535,204
. Other
Patents Pending.
Revision Description
A Initial release for publication on CD
(4/26/04)
Previous release incorporated new commands.
(11/24/97)
MultiModem, MultiModemZDX/V, Multi-Tech, and the Multi-Tech logo are
trademarks of Multi-Tech Systems, Inc.
Microsoft, Windows, and Windows 95 are registered trademarks of the
Microsoft Corporation.
All brand and product names mentioned in this publication are trademarks
or registered trademarks of their respective companies.
Multi-Tech Systems, Inc.
2205 Woodale Drive
Mounds View, Minnesota 55112 U.S.A.
(763) 785-3500 or (800) 328-9717
U. S. FAX 763-785-9874
Technical Support (800) 972-2439
Internet Address: http://www.multitech.com
Contents
Chapter 1 - Introduction and Description
Introduction.................................................................................................................... 5
Requirements ................................................................................................................ 5
Computer............................................................................................................... 5
Serial Cable........................................................................................................... 5
Telephone Line...................................................................................................... 5
Communications Software ................................................................................... 6
Product Features........................................................................................................... 6
Data ....................................................................................................................... 6
Fax ......................................................................................................................... 7
Voice (Model MT3334ZDXV only)........................................................................ 7
About this Manual ......................................................................................................... 7
Chapter 1 - Introduction and Description............................................................. 7
Chapter 2 - Installation and Connection .............................................................. 7
Chapter 3 - AT Commands, S-Registers and Result Codes............................... 8
Chapter 4 - Testing Your Modem ......................................................................... 8
Chapter 5 - Service, Warranty & Technical Support............................................ 8
Appendices............................................................................................................ 8
Chapter 2 - Installation
Introduction.................................................................................................................... 9
Safety Warnings ............................................................................................................ 9
Installation Process....................................................................................................... 9
LED Indicators............................................................................................................. 1 2
Is Your MultiModemZDX Ready for Use? .................................................................. 14
Operating Your MultiModemZDX................................................................................ 1 5
Simple Operations .............................................................................................. 15
Remote Configuration................................................................................................. 16
Software Configuration ............................................................................................... 17
Hardware/Software Confirmation ....................................................................... 18
Troubleshooting ........................................................................................................... 19
None of the LEDs Light When the Modem Is On.............................................. 1 9
The Modem Does Not Respond to Commands ................................................ 20
The Modem Dials But Cannot Make Connection .............................................. 22
The Modem Disconnects While Online.............................................................. 24
The Modem Cannot Connect When Answering ................................................ 24
Slow File Transfer ............................................................................................... 25
Losing Data ......................................................................................................... 25
Garbage Characters on the Monitor .................................................................. 26
Chapter 3 - AT Commands, S-Registers and
Result Codes
Command Summary ................................................................................................... 27
S-Registers.................................................................................................................. 3 6
Result Codes............................................................................................................... 41
iii
Chapter 4 - Modem Testing
Local Analog Loopback Test/V.54 Loop 3.................................................................. 42
Digital Loopback Test/V.54 Loop 2 (Local/Manual) ................................................... 43
Digital Loopback Test/V.54 Loop 2 (Remote/Auto).................................................... 4 4
Chapter 5 - Service, Warranty and Tech Support
Introduction.................................................................................................................. 46
Limited Warranty ......................................................................................................... 46
On-line Warranty Registration............................................................................ 47
Tech Support ............................................................................................................... 47
Recording Modem Information ........................................................................... 47
Service................................................................................................................. 48
About the Multi-Tech BBS..........................................................................................49
Logging on to the Multi-Tech BBS ..................................................................... 49
Downloading a File ............................................................................................. 49
Reading a Message ............................................................................................ 50
Leaving a Message............................................................................................. 50
Bulletins............................................................................................................... 51
About CompuServe/Internet ....................................................................................... 51
About the Multi-Tech Fax-Back Service ..................................................................... 51
Appendix A - T echnical Specifications
Appendix B - Tone Dial Frequencies
Appendix C - Regulatory Information
FCC Regulations for Telephone Line Interconnection............................................... 57
Canadian Limitations Notice....................................................................................... 60
Compliance with BABT Requirements ....................................................................... 61
European Low Voltage Directive........................................................................ 61
Compliance with BS6305 Clause 6.2, BS6320 Clause 7.2, and BABT/SITS/82/
005S/D................................................................................................................. 62
Compliance with BS6789: Section 3.1 and Part 2 ............................................ 63
Compliance with BS6328 Part 1 ........................................................................ 63
Modem CE Mark EMC and Safety Compliance ........................................................ 64
Australian and New Zealand Modem Warning Notice............................................... 64
Australian Modem Warning Notice..................................................................... 64
New Zealand Telecom Warning Notice.............................................................. 65
Index
iv
1 - Introduction and Description
5
Chapter 1 - Introduction and Description
Introduction
Welcome to the world of data communications. You have acquired one
of the finest intelligent data/fax modems available today, the
MultiModemZDX, from Multi-Tech Systems. This Owner’s Manual will
help you install, configure, test and use your MultiModemZDX.
Requirements
In addition to the contents of the MultiModemZDX package, you will need
the following equipment.
Computer
The MultiModemZDX (MT3334ZDX or MT3334ZDXV) can be connected
to any computer with an RS-232 serial port, such as the IBM PC, XT, AT,
and PS/2 computers, and most IBM compatibles.
Note that your computer
system should have a processing speed of at least 75 MHz in order to take
full advantage of the telephony features of this product.
Serial Cable
You will need a serial cable to connect the MultiModemZDX to your
computer. Serial cables are available at computer stores and many office
supply stores. The cable must have a DB-25P connector at the modem
end. For IBM and compatible computers, the other end may have a DB25P connector or a DB-9S connector, depending on your particular
computer and whether you are using the COM1 or the COM2 serial port.
Telephone Line
You must have a telephone line with a conveniently located connector
(jack) to accept the cable that comes with the MultiModemZDX. If you do
not have a telephone jack near your computer, you should install an
extension before proceeding.
MT3334ZDX/V Owner's Manual
6
Communications Software
You will need data communications (datacomm), fax communications
software and, for the MultiModemZDX, an appropriate application software
package to access the Personal Voice-Mail features of the
MultiModemZDXV. The MultiModemZDX is also compatible with
datacomm and fax programs you may already own.
Product Features
General features include:
• Compliance with major ITU-T, TIA, and EIA international standards
to ensure compatibility with other modems.
• Distinguishes data, fax, or voice calls using DTMF and tone detection
with software packages supporting these features.
• Caller ID to identify your caller’s phone number (available on U.S.
products).
Data
• Supports the enhanced ITU-T V.34 standard, with data transmission
speeds to 33.6K bps, while also maintaining compatibility with lowerspeed modems.
• Supports asynchronous data rates at 33.6K, 31.2K, 28.8K, 26.4K,
24K, 21.6K, 19.2K, 16.8K, 14.4K, 12K, 9600, 4800, 2400, 1200, and
300 bps.
• Automatic fallback to slower speeds in noisy line conditions, and fallforward to faster speeds as conditions improve.
• 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.
• Automatic disabling of compression when transferring alreadycompressed files.
• Autodial, redial, pulse (rotary) and touch-tone dial.
• Dial tone and busy signal detection for reliable call-progress detection.
• Compatibility with the standard AT command set used by most
communication programs.
1 - Introduction and Description
7
Fax
• Supports V.17, Group 3 fax communication standards, allowing it to
communicate with other fax modems as well as with fax machines.
• Responds to Class 1 fax commands, enabling it to exchange editable
and encrypted faxes with other Windows 95 computers.
• Sends and receives faxes from your computer at 14,400 bps, 9600
bps, 7200 bps, 4800 bps, 2400 bps, or 300 bps.
Voice (Model MT3334ZDXV only)
• Full-duplex speakerphone support with adjustable speaker volume
control. Can record and play back answering machine messages
using optional microphone and speaker.
• Remote/local telephone answering machine (TAM) capabilities
include voice mail control, record/playback, and call screening.
• Supports the TIA/EIA IS-101 AT+V voice command set.
Note: For more information on +V commands supported by the
MT3334ZDXV refer to Multi-Tech's Voice +V Commands Developer's Kit
(P/N 82039200). This document is available upon request.
About this Manual
This manual is divided into five chapters and three appendices. The
information contained in each chapter and appendix is as follows:
Chapter 1
-
Introduction and Description
Chapter 1 begins with a short product introduction and description;
followed by a guide (which you are now reading) to the use of this manual.
Chapter 2
-
Installation and Connection
Chapter 2 documents the procedure for connecting the MultiModemZDX
to your computer and to the phone line. Details are given, supported by
illustrations as a guide for installing your MultiModemZDX to the point of
operation. There is also a Troubleshooting section in the event your
MultiModemZDX is not operating properly.
MT3334ZDX/V Owner's Manual
8
Chapter 3
-
AT Commands, S-Registers and Result Codes
Chapter 3 documents default and option ATcommands, S-Registers and
Result Codes supported by the MultiModemZDX.
Chapter 4 - Testing Your Modem
Chapter 4 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 5
-
Service, Warranty & Technical Support
Chapter 5 provides instructions for getting modems serviced at the
factory, statements on your ten-year warranty, information about our user
Bulletin Board Service (
BBS
) and receiving technical support via the
CompuServe and Internet forums.
Appendices
Appendix A - Technical Specifications
Appendix B - Tone Dial Frequencies
Appendix C - Regulatory Information
2 - Installation
9
Chapter 2 - Installation
Introduction
This chapter will provide you with the basic steps necessary to install and
configure your MultiModemZDX. Before attempting any procedure, be
sure to read the safety warnings in the following section.
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.
Installation Process
The installation of the MultiModemZDX consists of making the physical
connections necessary to render the modem functional with your computer.
This includes making the proper serial, phone line, and power connections.
RS232
PHONE LINE
RJ11/Phone Connection
RJ11/PSTN Connection
Power Connector
(to Transformer)
DB25 to Computer
POWER
Figure 2-1. MultiModemZDX Connections
MT3334ZDX/V Owner's Manual
10
To install your MultiModemZDX:
1. Attach the MultiModemZDX to dial-up phone lines using the RJ11
telephone cord. This is accomplished by plugging one end of the
cable provided with the MultiModemZDX into the telephone jack in
your home or office; and plugging the other end into the LINE jack on
the MultiModemZDX.
The LINE jack is not interchangeable with the PHONE jack on the
MultiModemZDX. Do not plug the telephone into the LINE jack or the
line cable into the PHONE jack.
2. Attach your MultiModemZDX to your PC or terminal with an RS232
(or V.24) cable (see Figure 2-1). Be sure to tighten the mounting
screws on the DB connectors.
3. Connect your telephone set to phone jack via RJ11 cable.
4. Attach your MultiModemZDX to the AC Power transformer and
plugging the AC connector into a live AC outlet.
5. Turn on power by flipping the
"ON/OFF"
switch on the side of the
MultiModemZDX to the
"ON"
position.
Note: Use only the power supply provided with the MultiModemZDX.
Use of any other power supply will void the warranty and could damage
the modem.
6. Make sure modem and computer/terminal serial port baud rates are
adjusted. (Note that several programs can check this for you. 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.)
7. Proceed to Chapter 3 of this manual, or to your data communications
software manual.
2 - Installation
11
✳
#
Figure 2-2. MultiModemZDX Connections
MT3334ZDX/V Owner's Manual
12
LED Indicators
The MultiModemZDX has ten LED indicators (Figure 2-3) to report status
(such as verifying proper installation) and line activity (such as monitoring
the status of a connection).
Figure 2-3. 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 MultiModemZDX. 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
MultiModemZDX are presented on this line. When no carrier signal is
being received (pin 8 negative), this line will be forced into a marking
condition. The RECEIVE (RD) LED indicates the status of this signal.
2 - Installation
13
CD
Carrier Detect. This LED lights when a valid carrier signal from another
modem is detected.
33
V.34. This LED is lit when the modem is connected in V.34 mode at
33,600 bps.
14
V.32
bis
. This LED is lit when the modem is connected in V.32
bis
mode.
Note at speeds lower than a V.32
bis
connection, the MultiModemZDX
speed LEDs remain unlit.
96
9600bps
. This LED is lit when the modem is connected at 9600 bps.
OH
Off Hook. The condition of Off Hook indicates to the central office that the
MultiModemZDX wants the phone line to do something (i.e., dial or
answer a call). This LED is also lit when the MultiModemZDX has
achieved on-line status.
MT3334ZDX/V Owner's Manual
14
TR
Terminal Ready. When TR is lit, the MultiModemZDX can answer an
incoming call. This signal (TR or DTR) provides a means for the terminal
or computer to control the MultiModemZDX's connection to the
communications channel. A high DTR signal is required by the
MultiModemZDX to be able to communicate. The state of the TR LED
matches that of the DTR circuit on pin 20 of the RS232/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.
Is Your MultiModemZDX 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
AT&V<cr>
command. This command lists how your modem is currently configured.
If you come across a setting you’re unsure of, refer to Chapter 3 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.
2 - Installation
15
Operating Your MultiModemZDX
You control your MultiModemZDX by issuing AT commands and setting
S-Registers. Right now your MultiModemZDX 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 3 for AT Commands and S-Registers.)
In operating your MultiModemZDX it is likely that you will use your data
communications software to either:
• enter “terminal” mode, where you can “speak most directly” to the
modem by issuing AT commands, or to
• 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, nor run the risk of mistakenly
keying-in incorrect information.
Either way, you need to understand that an AT command is the method
by which your modem is controlled, and must therefore prefix nearly all
commands. 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
terminal mode, enter AT followed by <CR> to check whether your modem
is operational. If everything’s fine, your modem will respond
OK
.
Simple Operations
You can dial by using the ATD command and the phone number of the
modem with which you wish to connect, e.g., ATD6127853500. 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 +++ATH<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.
MT3334ZDX/V Owner's Manual
16
Remote Configuration
The Remote Configuration feature is a network management tool that
allows you to configure modems remotely. This means you could
configure modems anywhere in your network from one location without
having to visit the sites or rely on remote users to follow your instructions.
You can download new parameters and implement new features.
S-Register S9 has been set up to contain the special Remote Configuration
escape code. When calling a Remote Configuration equipped modem,
you enter the proper Remote Escape Code entering your Set-up Password.
You can then execute AT commands as if you were connected locally. If
you set S-Register S9 to 0 (zero), Remote Configuration is disabled.
Setting S9 to a value other than zero, defines the escape key. For
example, if S9 = 37, the % (percent sign) would be the escape key. The
S9 value can be stored with the &W0 command.
To store the remote configuration password, type the following:
AT#S=password<RETURN>
The password can be from 1 to 8 characters in length and is case
sensitive. This password can be changed in command mode but not in
remote configuration. If no user password has been stored, the default
password is "MTSMODEM". If a user password has been set, the default
password is disabled.
To enter Remote Configuration from online mode, enter the value in S9
three times, the type ATpassword <RETURN>. For example:
If S9 = 37, enter: %%%ATpassword<RETURN> and you will be
in command mode.
Note: If an AT&F (load factory defaults) command is entered, or if an ATZ
(modem reset) command is entered and S9 has not been saved, S9 will
return to zero. However, if either of these two commands are entered, the
password will remain saved.
2 - Installation
17
Software Configuration
Communications software must be configured to work with the
MultiModemZDX, 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.
Some software programs allow you to select your modem type from a
menu. By this method, initialization strings that correspond to a particular
modem type can be selected to operate optimally with the software it is
utilizing.
Figure 2-4. MultiModemZDX Initialization Setup
Other software programs require you 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 modem:
AT&F<cr>
This setting configures your modem to operate optimally with the software
it is utilizing.
Note: Refer to your respective software manual for further information on
your communications software.
MT3334ZDX/V Owner's Manual
18
Hardware/Software Confirmation
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 the troubleshooting section of this chapter.
3. To confirm how your MultiModemZDX is configured, enter
AT&V<cr>
.
What is then reported is how the MultiModemZDX is currently
configured.
Figure 2-5. MultiModemZDX Configuration Confirmation
2 - Installation
19
Troubleshooting
Your MultiModemZDX 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, it is
possible that the modem is defective. However, it is more likely that the
source of your problem lies elsewhere. Problems you may 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.
None of the LEDs Light When the Modem Is On
When you turn on the MultiModemZDX, 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.
• Test the outlet is live by plugging a lamp into it.
• The modem or power supply may be defective. If you have another
Multi-Tech modem, try swapping modems. If the problem goes away,
the first modem or power supply may be defective. Call Tech Support
for assistance.
Note: Do not under any circumstances replace the power supply module
with one designed for another product, as it may damage the modem and
void your warranty.
MT3334ZDX/V Owner's Manual
20
The Modem Does Not Respond to Commands
• Make sure the modem is plugged in and turned on. (See “None of the
LEDs Light When the Modem Is 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 data communications
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.
• 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
communications 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 software
has made a connection with the modem through the COM port.
• Your communications 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.
2 - Installation
21
• 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 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 addresses
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, 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 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 Multi-Tech
modem, try swapping modems. If the problem goes away, the first
modem is possibly defective. Call Tech Support for assistance (see
Chapter 5).
MT3334ZDX/V Owner's Manual
22
The Modem Dials But Cannot Make Connection
There can be several reasons the MultiModemZDX fails to make a
connection. Possibilities include
• 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.
• 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 to get an outside line, the easiest way to dial it
automatically is to include it in the modem’s dial prefix, e.g., ATDT9,.
Note the comma, which inserts a pause before the number is dialed.
By inserting 9, into the dial prefix, you do not have to include it in each
directory entry.
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