Retronetworking

All material within is copyrighted by Zoom Telephonics 1992.

All Rights Reserved

OWNERS MANUAL ZOOM HIGH-SPEED FAXMODEMS

Chapters and appendices in this manual

Introduction

Chapter 1 Quick-Start Instructions provides instructions for getting your

          faxmodem up and running in the shortest possible time.

Chapter 2 Using Your Faxmodem explains the uses and purpose of

          communications software. This chapter also details the faxmodem's

          non-volatile memory and the external faxmodem's front panel lights.

          The chapter concludes with an explanation of faxmodem

          compatibility, character format, baud rate, and leased-line operation.

Chapter 3 Operating Your Faxmodem describes the faxmodem's operating modes

          and how to switch between them.

Chapter 4 AT and Extended AT Commands explains the purpose of modem

          commands and how to type, delete, edit, and execute them. A

          complete description of the AT and extended AT commands is

          included.

Chapter 5 Configuring Your Faxmodem Parameters describes the purpose of

          faxmodem registers, how to read them, and how to change their

          values. A complete description of the faxmodem registers is included.

Chapter 6 Dialing and Answering  explains how to originate and answer calls

          with a terminal or when your computer is in terminal mode.

Chapter 7 Error Correction and Data Compression describes how to use the MNP

          and V.42 error-correction protocols to transmit and receive error-free

          data. A complete description of the MNP and V.42/V.42bis commands

          is included.

Chapter 8 Synchronous Operation describes how to operate your faxmodem

          synchronously. If you will be performing asynchronous or dial up

          operations only, you may choose to skip this chapter.

Chapter 9 Fax Operation  describes how to perform fax operations with your

          faxmodem.

Chapter 10     Diagnostics describes how to perform various tests to evaluate your

               faxmodem, the remote modem, and the telephone line between them.

Chapter 11     Troubleshooter's Guide describes problems that may arise, identifies

               the cause, and suggests corrective action.

Chapter 12     High-Speed Modem Primer designed for busy people who want to

               know more about their faxmodem and how it can reduce their

               telephone-line charges.

Zoom High Speed Fax/Modem Owner's Manual....................................2

Appendices:

Appendix A     FCC Notice

Appendix B     Canadian DOC Notice

Appendix C     Detailed Installation Instructions provides in-depth instructions for

               installing the external and internal faxmodems.

Appendix D     Replacing the Fuse describes how to replace the fuse in the external

               faxmodem.

Appendix E     Connecting to the Telephone Line provides detailed information about

               connecting your faxmodem to the telephone line.

Appendix F     Connector Pin Assignments lists the external faxmodem's RS-232-C

               pin assignments and describes the required connections for proper

               operation.

Appendix G     ASCII Character Table lists the complete set of ASCII characters.

Appendix H     Glossary defines the technical terms that appear in this manual.

Appendix I     Technical Specifications lists the faxmodem specifications.

Introduction:

Checking your components

Unpack your faxmodem components and make sure you have the following items:

One faxmodem

A modular telephone cable to connect your faxmodem to the telephone line

Power supply (external faxmodem only)

Owner's manual

When you open your package, make sure all of the above items are included

and that none of the hardware is damaged. If you verify that any components

are damaged, please notify your dealer.

You may also have the following items:

Communications and fax software and manual(s) (included with most internal

and some external faxmodems)

Serial cable (included with some special external faxmodem packages)

What else you need

To complete your data communications system, you will need the following

items.

Some type of communications and fax software,, if not included. Refer to

Using communications software in Chapter 2,

A modular telephone jack to connect your faxmodem to the telephone line,

An optional telephone (you do not need to use a telephone with your

faxmodem),

For the external model, an available RS-232 serial port on the personal

computer, and a properly configured RS-232-C interface cable (refer to the

NOTE below),

For the internal model, An available card slot in your personal computer

NOTE: V.42bis and MNP 5 require that the serial cable support hardware flow

control. If you have an IBM PC or compatible,, any modem cable that fits

your PC should work. If you have a Mac,, check that pin 4 of the cable's

25-pin connector is wired to the Mac side of the cable (pin 1 for the Mac

SE,, II,, or Plus). This cable is known as a hardware flow control,

high-speed, V series, or MNP cable.

Zoom High Speed Fax/Modem Owner's Manual....................................3

Using this manual

This manual describes how to install, operate, and test both the external

and internal faxmodems. If certain information applies only to one

faxmodem, it will be clearly identified.

The information in this manual is designed so that you can begin using your

faxmodem in the shortest possible time, without having to read the entire

manual. In fact, you need never read some chapters and appendices to

operate the faxmodem.

Conventions used in this manual

The carriage return key on your keyboard is referred to as the Enter key in

this manual. This key may be marked as ? on your keyboard.

If an item requires special attention, IMPORTANT! will alert you to the

item.

Chapter 1

Quick-Start Instructions

This chapter provides quick-start instructions for experienced faxmodem

users. If you are a novice faxmodem user, or prefer detailed, step-by-step

instructions, please refer to Appendix C. You should also refer to Appendix

C if you need to configure your faxmodem for operation in Japan.

If you have the external faxmodem, proceed with External faxmodem

quick-start, below. If you have the internal faxmodem, turn to page 1-4.

External faxmodem quick-start

If you have an external faxmodem, use the following steps to install it.

Check each step after you complete it.

Make sure your computer is turned OFF.

Place the faxmodem in a clear area, near an AC outlet, where you can see

the front panel lights, known as LEDs. The distance to your computer is

limited by the length of your RS-232-C cable.

Make sure the power switch on the back of the faxmodem is in the down (OFF)

position.

 Make the connections shown in Figure 1-1. The RS-232-C cable connecting

your computer and faxmodem must be shielded and conform to the pin

assignments in Appendix G.

IMPORTANT! Make sure the RS-232-C cable supports flow control. Otherwise,

you cannot use your faxmodem's data compression features. If you have a

Macintosh, check that pin 4 of the cable's 25-pin connector is wired to the

Mac side of the cable (pin 1 for the Mac SE, II, or Plus).

Turn on your computer.

Turn on the faxmodem by raising the power (ON/OFF) switch on the back of

the faxmodem (see Figure 1-1).

The MR LED on the front of the faxmodem should go ON to indicate that the

faxmodem is turned on and receiving AC power. Depending on the exact

configuration of your faxmodem, other LEDs may also go ON.

Pick up the telephone handset and check for a dial tone.

Load your communications software and enter direct (terminal) mode. The

manual that came with your software should explain how to put it into this

mode.

The TR LED should go ON to indicate that your communications program is

asserting the Data Terminal Ready (DTR) signal. The TR LED will not go ON

if you have a Mac, because the Mac uses the DTR line for hardware flow

control.

At the terminal mode prompt, type AT and press the Enter key.

Zoom High Speed Fax/Modem Owner's Manual....................................4

Your faxmodem should respond with OK. This indicates the faxmodem is

working. If you do not get this response, repeat the above step. Make sure

you are in terminal mode. If you still do not get the OK response, make

sure your communications software is configured for the same COM port as

the RS-232-C (serial) port that your faxmodem is connected to.It is not

always obvious which port on the computer is COM1 and which is COM2. If the

faxmodem is, in fact, correctly connected, and still does not respond,

refer to the section Testing the external faxmodem connections on page C-

in Appendix C.

You have now completed the external faxmodem installation. Please proceed

to page 1-4.

Internal faxmodem quick-start

If you have an internal faxmodem, use the following steps to install it.

Check each step after you complete it.

Turn off the personal computer's power. This is important. The power must

be off when you install the faxmodem.

Make sure you can freely access the back of the computer.

Remove the computer cover (refer to the manual that came with your computer).

IMPORTANT! Set the correct COM port. The most common cause of faxmodem

problems is an incorrectly configured COM port. Therefore, it is worthwhile

to take the time to make sure that you choose the correct COM port, so

please read the following text completely and carefully. If you are not

familiar with the issues addressed below or feel unsure about any aspect of

COM port selection or configuration, we advise that you read Appendix C,

Detailed Installation Instructions.

For your faxmodem to function properly, there must not be a COM port

conflict. This means that no two devices can be trying to use the same

COMport (1, 2, 3, or 4) setting.

If your computer has one or two external serial ports, as do many

computers, the serial ports almost always will be set to COM1 and COM2.

Even if your computer only appears to have one serial port (which would

normally be assigned COM1), COM2 may already be assigned to a second serial

port and therefore be unavailable for use with your faxmodem. If COM1 and

COM2 are assigned, they cannot be used for the faxmodem. This is true

whether or not the serial ports are actually being used.

Furthermore, COM1 and COM3 share the same interrupt location, as do COM2

and COM4. When certain serial devices (such as a serial mouse) are

installed as COM1, they may interfere with a faxmodem installed as COM3, and

when installed as COM2, they may interfere with a faxmodem installed as COM4.

We recommend that you set your faxmodem and software for COM4. This should

work in the majority of cases. If you have a mouse on COM2, set your

faxmodem for COM3.

Set the three red jumpers on your faxmodem for the COM port you have

selected. Refer to Figures 1-3 and 1-4.

Select an available full-card slot for installation of the faxmodem.

Remove any slot cover that may be over the slot at the computer's back

panel. Keep nearby the screw that held the slot cover in place.

Hold the faxmodem above the slot you selected, with the faxmodem's edge

connector pointing down toward the base of the computer.

Carefully slide the faxmodem into the slot, applying even pressure to both

ends of the faxmodem. Stop inserting the faxmodem when its gold-plated edge

connectors are firmly seated. If you removed a screw from the slot cover, use it to

secure the

faxmodem in the slot. Load your communications software and enter direct (terminal)

mode. The

manual that came with your software should explain how to put it into this mode.

At the terminal mode prompt, type AT and press the Enter key.

Zoom High Speed Fax/Modem Owner's Manual....................................5

Your faxmodem should respond with OK. This indicates the faxmodem is

working. If you do not get this response, repeat the above step. If you

still do not get the OK response, make sure your communications software is

configured for the same COM port as the RS-232-C (serial) port to which

your faxmodem is connected. If it is, refer to the section Testing the

internal faxmodem connections on page C- in Appendix C.

Make the connections shown in Figure 1-5. Then pick up the telephone

handset and check for a dial tone.

 Replace and secure the computer cover.

You have now completed the internal faxmodem installation. Proceed to the

next page.

Standard configuration

For most asynchronous and synchronous operations, you won't need to change

any settings. The factory default configuration should work for the vast

majority of users. Speed, compression, and error correction are

automatically negotiated.

If your faxmodem is not communicating properly using the factory default

settings, particularly if it is unable to connect to another modem that you

know does not support error correction and/or data compression, you may

need to force your faxmodem into a particular mode that matches the

requirements of the remote modem, as referred in the section below.

If you've changed any settings, you can return to the factory default

settings at any time by typing AT&F and pressing the Enter key.

Other configurations

You can force your faxmodem to communicate in various ways by using special

AT command strings or dial prefixes. If you are having trouble connecting

with non-error-correcting modems, for example, you may need to use this

technique. Refer to Chapter 11, Troubleshooter's

Guide, for details.

Chapter 2   Using Your Faxmodem

Chapter 2 is an overview on using your faxmodem. Topics include:

Communications software

Non-volatile memory

The external faxmodem LEDs

Faxmodem compatibility

Baud rate and connection speeds to other modems

Valid character formats

Leased-line operation

Using communications software

To use your faxmodem with a personal computer, you will need a

communications or terminal emulation software program. The communications

software program will make it easy to send instructions (in the form of

commands) to your faxmodem to have it perform various tasks, such as

dialing a call, answering a call, or changing its operating characteristics.

Because your faxmodem is compatible with the Hayes AT command set, your

faxmodem will work with virtually any communications software designed for

your computer.

Your faxmodem also supports V.42bis and MNP 5 data compression, which

requires the software to support hardware (CTS/RTS) flow control and

software (XON/XOFF) flow control. Many popular communications software

packages support flow control, including the following PC and

Macintosh-compatible

software.

Zoom High Speed Fax/Modem Owner's Manual.................................6

PC-compatible software:

Bitcom Deluxe,Carbon Copy Plus,Crosstalk XVI and Mark IV,HyperAcess

Microsoft Windows Terminal,Mirror II and III, MTEZProComm Plus

Quick Link II, Qmodem, SST

Remote 2 (Host), Smartcom III, Telix.

Macintosh-compatible software

Microphone II,Quick Link II, Red Ryder, Smartcom for Mac,

STF, White Knight, Z Term.

Synchronous operation

Your faxmodem may support synchronous communications. If you will be

performing synchronous communications, you will need special software that

supports the synchronous port on your computer or terminal. If you do not

have such software, refer to the computer manufacturer's instructions or

contact the manufacturer for recommended software.

Achieving maximum throughput

If you have an internal faxmodem, it uses a high-performance 16550A UART to

achieve maximum possible throughput, especially with slower computers. To take

advantage of this design, your communications software must support

this chip. Recent releases of most major communications programs do support

this chip.

Setting up your communications software

The first time you use your communications software, you may be asked to

select the modem type from a menu. If you don't see this faxmodem listed

by name on the menu, select Hayes Smartmodem 9600 or Hayes V-series V.42

(for the V.32 faxmodem), or Hayes Ultra 14400 bps (for the V.32bis

faxmodem).

Specifying modem options

If your communications software program does not ask you to specify the

type of modem you are using, you may be asked to enter certain setup

information. In this case, enter the information specified in the Table

2-1. (If you did specify the type of modem, or if the software itself sets

up an initialization string, then you should not modify the setup provided

by the software.)

Table 2-1. Modem Options

For This Setup Option..., Enter This Information...

Initialization string1, AT &F &C1 &D2 <<CR>>

Dialing command, ATDT

Dialing command suffix, <<CR>>

Hangup command, ~~~+++~~~ATH1 <<CR>>

Auto-answer ON command, ATS0=1 <<CR>>

Wait for connection, 45 (seconds)

Pause between redial, 1 (second)

Auto-baud detect, ON

Drop DTR to hangup?, YES

Send init if CD high?, YES

Hardware flow control (RTS/CTS)?, ON

Zoom High Speed Fax/Modem Owner's Manual....................................7

Dialing directory entries, All should be set to 57,600 bps.

With this setup, all communications between your computer and faxmodem will

occur at 57,600 bps, independent of your faxmodem's connection to the

remote modem. Your faxmodem will automatically negotiate the fastest speed

possible with the remote modem.

In some cases, the delay that occurs during auto-negotiation may cause a

problem. If you experience such a problem, type AT&Q6 from Command Mode and

press the Enter key to disable auto-negotiation of Error Checking.. To enable

auto-negotiation

again, type AT&Q5 from Command Mode and press the Enter key.

Start-up sequence for external faxmodems

IMPORTANT! If you have an external faxmodem, you should have the faxmodem

turned on before you start up your communications or fax software.

 If your faxmodem is off when you start up the program, the faxmodem will not

receive the

initialization string from the program and may not work properly.

An important example: This faxmodem conforms to the Hayes standard for AT

commands, which means that it defaults to the command settings &C0 and &D0.

Many programs for PC-compatible computers, however, require that the

faxmodem be initialized with the commands &C1 and/or &D2; the programs

therefore include these commands in the initialization string. But if your

faxmodem is turned off when the program begins, the faxmodem will not

receive this critical string.

Another way of handling this situation is to store initialization commands

in non-volatile memory, which is described on the next page.

Disabling Call Waiting;

Some telephone companies offer a feature called Call Waiting. This

feature clicks when you receive an incoming call while using the

telephone line.

You may appreciate this feature, but your faxmodem doesn't. In fact, this click

may disconnect your faxmodem from the remote modem during data

transmission. Therefore, you should turn off Call Waiting, if possible,

before making your modem calls.

In some areas, Call Waiting can be temporarily turned off by pressing *70,

on your Touch-Tone telephone before dialing a telephone number. If your

Call Waiting can be turned off in this way, you should enter ATDT*70, as

your Dialing command in your communications software program. (Be sure to

type the comma.)

*70, turns off Call Waiting only for the duration of the next outgoing

call. When the call is over, Call Waiting will go back into effect. If you

are not sure whether *70, will turn off Call Waiting, check with your local

telephone company.

IMPORTANT! Unfortunately, there is no way to disable Call Waiting for a

call that you have received, so you may still have a problem due to Call

Waiting when you are receiving a call. See the description of Register S10

on page 5-11 for help with this problem.

Non-volatile memory

When you turn on your faxmodem or reset it, your faxmodem loads the active

configuration profile into non-volatile memory (NVRAM). The active

configuration profile is a group of configuration settings, derived from

the values of the faxmodem's internal S registers, that define how the

faxmodem will operate when it's turned on or reset. The active

configuration profile can be either the factory-default configuration or

one of two user-defined profiles.

Zoom High Speed Fax/Modem Owner's Manual....................................8

Factory configuration profile

The first time you turn on your faxmodem, the factory configuration profile

becomes the active configuration profile. The factory configuration

profile is a group of standard operating parameters that will allow most

users to begin sending and receiving data as soon as the faxmodem is installed

and the communications software is loaded. The factory

configuration profile is stored in the faxmodem's Read-Only Memory (ROM)

and cannot be changed.

The Quick-Reference Guide shows the factory configuration profile.

If you change your faxmodem's operating characteristics and want to return

to the factory configuration profile: Type AT&F and press the Enter key.

 A copy of the factory configuration profile will be loaded into the active

configuration profile.

 If you want the factory configuration profile to be the active

configuration profile the next time you turn on or reset your faxmodem:

Type AT&Y&F&W and press the Enter key.

The factory settings will be written to configuration profile 0 in

non-volatile memory.

Creating user-defined configuration profiles

For your convenience, your faxmodem lets you store two sets of operating

characteristics in non-volatile memory. If you use certain commands or

characteristics over and over again, you should store them in the

user-defined configuration profiles. Any command not stored will be set to

match the factory default settings.

The following commands can be stored: Bn, En, Ln, Mn, Nn, P or T dial

modifiers, Qn, Vn, Wn, Xn, Yn, &Cn, &Dn, &Gn, &Jn, &Kn, &Pn, &Qn, &Rn,

&Sn, &T4, &T5, and &Xn. For information on these commands, refer to Chapter4

The following registers can have their values stored: S0, S2 through S12,

S14 and S15, S18, S21 through S23, S25 through S41, S44, S46, S48 through

S50, S82, S86, S91, and S95. For information on these registers, refer to

Chapter 5.

You can also store telephone numbers using the &Z0, &Z1, &Z2, and &Z3

commands. For more information, refer to Chapter 4.

Creating the first profile

To create the first user-defined configuration profile:

Type the commands you want to store in the first user-defined configuration

profile and type the &W0 command as the last command in the command line.

For example, suppose you want the first profile to store the following

commands: &C1 DCD follows the remote carrier signal.

L0 low speaker volume.

M2 keep the speaker always on.

S95=44 enable compression, carrier, and protocol responses.

Your command line would look like:

AT &C1 L0 M2 S95=44 &W0

Press the Enter key.

The commands are stored in configuration profile 0.

To have the faxmodem use this profile, send the &Y0 command as described

under Specifying the power-up profile, below.

Creating the second profile

To create a second user-defined configuration profile:

Type the commands you want to store in the second user-defined

configuration profile and type the &W1 command as the last command in the

command line.

Press the Enter key.

The commands are stored in configuration profile 1.

To have the faxmodem use this profile, send the &Y1 command as described

under Specifying the power-up profile, below

Zoom High Speed Fax/Modem Owner's Manual....................................9

Specifying the power-up profile

You can use the &Y command to have the faxmodem load one of two stored profiles

after it is

turned on or reset via hardware. These profiles can come from location 0 or 1

in non-volatile memory.

To load the user-defined configuration profile stored with the &W0 command:

Type AT &Y0 and press the Enter key.

The faxmodem will use the configuration profile stored in location 0 after

it is turned on or reset via hardware.

To load the user-defined configuration profile stored with the &W1 command:

Type AT &Y1 and press the Enter key.

The faxmodem will use the configuration profile stored in location 1 after

it is turned on or reset via hardware.

Viewing the configuration profiles

Using the &V command, you can view the active configuration profile, the two

user-defined

configuration profiles, and any stored telephone numbers.

Type AT&V.

Press the Enter key.

A screen similar to that shown in Figure 2-1 appears.

External faxmodem LEDs

If you have the external faxmodem, refer to Table 2-2 for an explanation of

the LEDs on the front panel. Figure 2-2 shows the LEDs on the external

faxmodem.

Table 2-2. External faxmodem LEDs

LED LABEL, LIGHT STATUS, DESCRIPTION

FAX, ON, Faxmodem has a fax connection.

14.4, ON, 14,400 bps connection in fax or data mode. If your faxmodem does

not have this light, you have a V.32 faxmodem, not a V.32bis faxmodem.

V32, ON, V.32 faxmodems 9600 bps connection.V.32bis faxmodems 4800,

7200, 9600, 12000, or 14400 bps connection.

V42, ON, V.42 error-correction connection with a remote modem.

DC (Data Compression), ON, V.42bis or MNP 5 data compression connection

with a remote modem.

EC (Error Correction), ON, Faxmodem has a V.42 or MNP 4 error-correction

connection with a remote modem.

FC (Flow Control), ON, Command Mode a flow control command (&K3, &K4, or

&K5) is in effect.Data Mode a flow control command is in effect and the

faxmodem's buffer is not full, allowing data flow from the computer to the

faxmodem.

FC, OFF, Command Mode disable flow control command (&K0) is in effect.Data

Mode flow control is disabled; or flow control is enabled, but the

faxmodem's buffer is full, preventing data flow from the computer to the

faxmodem.

HS (High Speed), ON, Faxmodem is operating at 4800 bps or faster.

AA (Auto-Answer), ON, Faxmodem is set up to automatically answer incoming

calls, BLINKING, Faxmodem has detected an incoming ring.

CD (Carrier Detect), ON, Faxmodem has detected a remote modem's carrier

signal.

OH (Off-Hook), ON, Faxmodem is off-hook (using the telephone line).

RD (Receive Data), BLINKING, Data is being sent from your faxmodem to your

Zoom High Speed Fax/Modem Owner's Manual....................................10

computer. When data is being sent at a fast data rate, this LED may appear

to be ON steadily.

SD (Send Data), BLINKING, A command or data is being sent from your computer's

serial port to your faxmodem. When data is sent at a fast rate, the LED may

appear to be ON steadily.

TR (Terminal Ready), ON, Faxmodem is receiving a Data Terminal Ready (DTR)

signal from the attached DTE, indicating that the DTE is ready to send or

receive data (DTR is ON). This LED does not work with a Macintosh, which

uses DTR for hardware flow control.

MR (Faxmodem Ready), ON, Faxmodem is receiving power. BLINKING,

Faxmodem is in

a Self-Test mode.

Compatibility

Table 2-3 shows the bit per second (bps) rate and data formats your

faxmodem can use.

Compatibility

Baud Rate (bps), Data Format, Compatibility

0-300, Asynchronous, CCITT V.21,Bell 103

1200, Asynchronous or Synchronous, CCITT V.22,Bell 212A

2400, Asynchronous or Synchronous, CCITT V.22bis

4800, Asynchronous or Synchronous, CCITT V.32 and V.32bis

7200, Asynchronous or Synchronous, CCITT V.32bis only

9600, Asynchronous or Synchronous, CCITT V.32 and V.32bis

12000, Asynchronous or Synchronous, CCITT V.32bis only

14400, Asynchronous or Synchronous, CCITT V.32bis only

The speed and compatibility (CCITT or Bell) used to exchange data with a

remote system is governed by the N0 or N1 command in effect. The N0 command

is described below. The N1 command is described on page 2-.

N0 command in effect

Use the N0 command if you want to accept only particular connections. When

the N0 command is in effect, your faxmodem will use the values of Register

S37 and the B command, and sense the computer-to-faxmodem speed, to set the

required speed and compatibility for this connection (see Table 2-4).

For example, if Register S37 is set to 0, the B1 command is in effect, and

your faxmodem senses the computer-to-faxmodem speed at 1200 bps, your

faxmodem will allow a Bell 212A connection at 1200 bps.

Table 2-4. N0 command in effect

S37 Setting, B Command in Effect, Speed Computer-to-Faxmodem Sensed,

Required Telephone Line Speed

0, 0, ? 600, V.21 300

0, 0, 1200, V.22 1200

0, , 2400, V.22bis 2400

0, , 4800, V.32bis 4800*

0, , 9600, V.32bis 9600*

0, 0, Other, V.32bis 14400

0, 1, ? 600, Bell 103 300

0, 1, 1200, Bell 212A 1200

1-3 (300), 0, , V.21 300

5 (1200), 0, , V.22bis 1200

6 (2400), , , V.22bis 2400

1-3 (300), 1, , Bell 103 300

5 (1200), 1, , Bell 212A 1200

7 Reserved, , , Reserved

8 (4800), , , V.32bis 4800*

9 (9600), , , V.32bis 9600*

10 (12000), , , V.32bis 12000

Zoom High Speed Fax/Modem Owner's Manual.................................11

11 (14400), , , V.32bis 14400

12 (7200), , , V.32bis 7200

*If a V.32 modem connects with your faxmodem at 9600 or 4800 bps,, the

resulting line protocol will be V.32 9600 or 4800,, respectively.

N1 command in effect

When the N1 command is in effect, your faxmodem uses its auto-mode detect

capabilities to automatically set the faxmodem to the fastest speed

supported by both modems. It begins this negotiation at the fastest

possible connection speed and decreases speed until a connection is

established.

@HEADING 1 = Character format

To communicate asynchronously with another modem, the character length and

format of your system must match with that of the remote asynchronous

system. Table 2-5 shows the valid character formats.

Character formats

Parity, Data Length, Stop Bits, Character Length

None, 7, 2, 10

Odd, 7, 1, 10

Even, 7, 1, 10

None, 8, 1, 10

Odd, 8, 1, 11

Even, 8, 1, 11

For 11-bit character lengths, 11-bit characters are sensed,, but the parity bits are

stripped off

during

data transmission in normal and error-correction modes. Direct mode does not

strip off the parity bits

The faxmodem speed senses data with mark or space parity. However, the

faxmodem configures to different parities as follows:

7 mark, 7 none

7 space, 8 none

8 mark, 8 none

8 space, 8 even

Leased-line operation

You can use the &L1 command to configure your faxmodem for use over a

leased (private) telephone line. In leased-line applications, there is a

faxmodem at each end of the leased telephone line. One modem is configured

to originate calls and the other is configured to automatically answer calls.

To perform asynchronous leased-line communications:

The person at the originating modem types AT &L1 &D0 S0=0 and presses the

Enter key.

The person at the answering modem types AT &L1 &D0 S0=1 and presses the

Enter key.

The person at the originating modem types AT X1 D and presses the Enter

key, while the person at the answering modem types AT A and presses the

Enter key.

To perform synchronous leased-line communications:

Make sure you have stored a telephone number with the &Zn= command (refer

to Chapter 4).

Zoom High Speed Fax/Modem Owner's Manual.................................12

The person at the originating modem types AT &Q2 &L1 &D0 S0=0 and presses

the Enter key.

The person at the answering modem types AT &Q1 &L1 &D0 S0=1 and presses the

 Enter key.

If you want to store these commands into the faxmodem's non-volatile

memory, add the command &W or &W1 (depending on the location where you want

them stored) to the end of the above command lines for the originating and

answering modems.

For an explanation of these commands, refer to Chapter 4.

Chapter 3

Operating Your Faxmodem

Your faxmodem is always in one of three operating modes, Command Mode, Data

(or On-Line) Mode, or Fax Mode. Chapter 3 describes Command Mode and Data

Mode and how to switch your faxmodem between them. Operating your faxmodem

in Fax Mode is described in Chapter 9.

Normally, you won't need to switch between these modes during normal

operation, since your communications software acts as a friendly interface

to the faxmodem.

Operating modes

When used as a modem, your faxmodem can be in either Command Mode and Data

Mode.

Command Mode lets you send commands from your keyboard to your faxmodem

to perform a variety of functions.

Data Mode lets you exchange data across the telephone line with a remote

modem. In Data Mode, your faxmodem assumes everything it receives from your

computer is data and sends it across the telephone line. Therefore, avoid

sending a command (other than the escape sequence, described on page 3-3 to

your faxmodem while in Data Mode, because your faxmodem will handle the

keystrokes as data.

The following sections describe how to enter these modes.

Entering Command Mode

Your faxmodem automatically enters the Command Mode after:

You turn on your faxmodem.

You lose the data connection with the remote modem.

The faxmodem detects an ON-to-OFF transition on the Data Terminal Ready

(DTR) circuit with the &D1 command in effect. If this happens, your

faxmodem returns to Command Mode without hanging up. To hang up the

faxmodem, send the H command or, if the &D2 command is in effect, have your

software turn off DTR.

The faxmodem detects an ON-to-OFF transition on the DTR circuit with the

&D2 command in effect. If this happens, your faxmodem hangs up and returns

to Command Mode.

The faxmodem detects an ON-to-OFF transition on the DTR circuit with the

&D3 command in effect. If this happens, your faxmodem hangs up, resets

itself, loads the active configuration from nonvolatile memory, and returns

to Command Mode.

You touch any key on your computer keyboard while your faxmodem is dialing.

This will cause your faxmodem to stop dialing, hang up, and return to

Command Mode.

IMPORTANT! If you reset the faxmodem while it's in Command Mode, it remains

in Command Mode and any data connection with a remote modem is terminated.

Entering Data Mode

Your faxmodem automatically enters Data Mode after making a data connection

with a remote modem. The two modems make the data connection using a

Zoom High Speed Fax/Modem Owner's Manual.................................13

process called handshaking.

Modems accomplish handshaking by sending high-pitched tones across the

telephone line. Normally you will hear these tones during the handshaking

process. By default, the speaker will be turned off when the carrier signal

is detected.

The escape sequence for switching to Command Mode

After your faxmodem makes a data connection with a remote modem, you can

use the escape sequence to return to Command Mode without breaking the data

connection.

By default, the escape sequence is defined as three plus signs (+++).

If you desire, you can change these characters by changing the value of

Register S2 (refer to Chapter 5)

Unlike other commands, you do not type the attention characters AT before

sending the escape sequence, nor do you press the Enter key after sending them.

Moreover, you must pause before and after sending the escape sequence.

This prevents the faxmodem from interpreting data you send, which may match the

escape sequence, as an escape character (if that data contains three plus

signs, for instance). The default setting for this pause is one second.

You can change the duration of the pause required by changing the value of

Register S12 (also described in Chapter 5).

The following procedure describes how to use the escape sequence to switch

from Data Mode to Command Mode while maintaining the data connection.

After your faxmodem makes an asynchronous data connection, wait at least

one second without typing anything.

Type the escape characters (default is +++).

Wait at least one second.

Your faxmodem responds with OK and enters the Command Mode without losing

the data connection.

You can now issue commands to perform such tasks as reading or changing

register values, or hanging up the faxmodem.

When you want to resume transmission, you can return to Data Mode and

optionally perform a retrain sequence, or try to establish a reliable (MNP)con.

To return to Data Mode type ATO and press the Enter key. Your faxmodem

sends a CONNECT nnnn response (where nnnn indicates the speed of the

connection) and returns to Data Mode.

To return to Data Mode and initiate an equalizer retrain type ATO1 and

press the Enter key. Your faxmodem sends a CONNECT nnnn response, returns

to Data Mode, and initiates an equalizer retrain. A retrain sequence causes

the connected modems to test the telephone line and optimize their

operation for transferring data over the telephone line. Use this command

if the telephone line condition has deteriorated during the connection.

This command works for 2400 bps and faster connections.

To enter a reliable connection type AT\O and press the Enter key. Your

faxmodem sends a CONNECT nnnn response and proceeds to exchange data

error-free with the remote MNP/V.42/V.42bis modem. (For the reliable link

to succeed, the remote modem must also support MNP/V.42/V.42bis.)

IMPORTANT! If the &D2 command is in effect and you use the +++ characters

to enter the Command Mode, an ON-to-OFF transition on the DTR interchange

circuit has the same effect as sending the H (Hang Up) command.

Chapter 4

AT and Extended AT Commands

Chapter 4 describes the AT and extended AT commands. Using these commands,

you can instruct your faxmodem to dial a call, answer a call, or change its

operating configuration.

If you're using communications software, you normally will not need to use

the AT and extended AT commands directly. Your communications software will

do this for you.

Zoom High Speed Fax/Modem Owner's Manual.................................14

However, if you're writing software applications for controlling the modem,

or if you want to understand the behind-the-scenes operation of your

faxmodem, you will want to learn more about the AT and extended AT command

set.

Topics discussed in this chapter include:

The format to use when typing commands

Correcting a typing mistake

Omitting a command parameter

Repeating a command line

Modem responses

A summary of the AT and extended AT commands

This chapter concludes with a complete description of the AT and extended

AT commands, presented in alphabetical order.

Typing a command

In order to send commands to your faxmodem, you must type a command line

while your faxmodem is in Command Mode. A command line can contain one

command or multiple commands. The only restriction is that the command line

cannot exceed 40 characters.

A command line must begin with the AT characters. After you type AT, you

can type the commands you want the faxmodem to perform. For example:

ATM2DT9,12165551212

This command line instructs your faxmodem to keep the faxmodem speaker

turned on continuously (M2), and then use touchtone dialing (T) to dial the

number 9 (D9), pause for two seconds (,), and dial the telephone number

1-216 555-1212.

If you want to enhance readability, you can insert spaces and punctuation,

such as parentheses and hyphens, in your command line. For example:

AT M2 DT9 , 1 (216) 555-1212

This command line will perform in exactly the same way as the one preceding

it. The only difference is that it's easier to read. Your faxmodem will

ignore spaces and punctuation in a Dial command line. However, you should

remember that spaces and punctuation occupy space in the faxmodem's command

buffer, which is limited to 40 characters.

If you make a typing mistake, press the Backspace key to delete the error,

then type the correct command. You can use the Backspace key to delete any

part of the command you typed, except AT.

To execute a command line, press the Enter key. Pressing Enter tells the

faxmodem to process the command line.

If you type more than 40 characters on the command line, the faxmodem will

return an ERROR response and ignore the command. If you want to type more

commands than will fit on a 40-character command line, type a command line

of fewer than 40 characters, end it with the semicolon (;), and press

Enter. Your faxmodem will execute the commands and return to Command Mode,

so that you can type your next command line.

Omitting a parameter

Some commands require a numeric parameter such as 0, 1, or 2 to completely

define that command. For example, the V command determines whether your

faxmodem sends you a word or numeric response after it executes (or tries

to execute) your command line:

Typing V0 tells the faxmodem to send numeric responses.

Typing V1 tells the faxmodem to send word responses.

If you omit a parameter from a command that requires one, it's just like

specifying a parameter of 0. If you type the V command without specifying

either 0 or 1 and press the Enter key, for example, it's just like sending

a V0 command, and the faxmodem will send numeric responses.

Repeating a command line

Your faxmodem stores the last-executed command line in memory until you

Zoom High Speed Fax/Modem Owner's Manual.................................15

type a new command line and press the Enter key. The A/ command will

re-execute the last command line you typed. The A/ command is particularly

useful when you want your faxmodem to re-execute a lengthy command line or

to redial a number that was busy.

When you want to use the A/ command, don't preface it with the AT

characters or end it by pressing the Enter key. Just typing A/ will

instruct the faxmodem to automatically re-execute the last command line.

IMPORTANT! You can use the A/ to automatically re-execute the last command

line your faxmodem executed at any time, unless you have typed a new

command line that begins with AT, your modem loses power, or you reset your

faxmodem.

Faxmodem responses

When you send a command to your faxmodem, the faxmodem sends an

asynchronous response that is displayed on your monitor screen. For

example, if you send a command line to your faxmodem, the faxmodem may

respond with OK. However, communications software may intercept the

responses and keep them from being displayed.

You can select responses from any of five response sets, designated X0

through X4. The X4 response set is the default response set. The response

sets determine which word or numeric responses are sent by the faxmodem.

They also define certain dialing characteristics and how the faxmodem

handles dial tones and busy signals, as described in the following

sections.

Responses can take the form of words or numbers. Your faxmodem is set up to

return word responses. Word responses are followed by an automatic carriage

return and line feed.

If your faxmodem is operating under an application that either cannot

handle character strings or handles them inefficiently, you can use the V0

command to switch to numeric responses. Numeric responses are followed by a

carriage return only.

If you do not want to receive responses at all, you can use the Q1 command

to disable responses. For example, you might want to disable responses

entirely if your faxmodem is connected to a printer, so that responses will

not print.

X response set (4-28)

The X response set consists of the first five responses in the faxmodem

response table in the Quick-Reference Guide.

With this response set, you receive the CONNECT response for

all connections, regardless of the speed at which they're made.

When you send a Dial command line with this response set in effect, your

faxmodem will wait for the time specified in Register S6 to elapse (default

is 2 seconds) after receiving your Dial command, then automatically dial

the telephone number whether or not a dial tone is present. This is known

as blind dialing. You may want to use blind dialing if you will be using

the faxmodem in an area that has an irregular or weak dial tone that your

faxmodem cannot always detect.

X1 response set

The X1 response set includes all of the X0 responses and provides the

CONNECT responses to inform you of the connection speed to the remote

modem. When you send a Dial command with this response set in effect, your

faxmodem will blind dial the call, as explained in X0 above.

X2 response set

The X2 response set consists of all the responses in the X1 response set,

and adds the NO DIALTONE response. When you send a Dial command with this

response set in effect, your faxmodem will listen for a dial tone before

dialing. If it does not detect a dial tone within five seconds, it hangs up

and returns the NO DIALTONE response.

Zoom High Speed Fax/Modem Owner's Manual.................................16

X3 response set

The X3 response set consists of all the responses in the X1 response set,

and adds the BUSY response, which the faxmodem will send when it dials a

telephone number that's busy. When this response set is in effect and you

send a Dial command to your faxmodem, your faxmodem will blind dial the

call.

X4 response set

The X4 response set is the factory-default response set. It consists of all

the responses in the X1 response set, and adds the NO DIALTONE and BUSY

responses. This response set allows the faxmodem to detect a dial tone and also a

busy signal.

Negotiation progress responses

You can enable an additional set of responses that provide information

about carrier speed, error-control protocol, and data compression. The

responses in this response set are the last 14 responses in the faxmodem

response table in the Quick-Reference Guide.

You can also use the S95 register (refer to page 5-31) to set the level and type

of response that will be displayed, and any bit set to 1 there will take

precedence over the W command setting.

The W command enables or disables this additional response set:

W0 disables negotiation progress responses (the factory default).

W1 enables the additional response set.

W2 error-correction call progress not reported. The appropriate CONNECT

response reports the DCE speed.

If the W1 command is in effect and an error-correction link is negotiated

and a connection made, you will receive the appropriate CONNECT response.

When error-correction is in use, the appropriate CARRIER response may

indicate one speed, while the CONNECT response may indicate another.

If you enable the additional response set, you can use the V0 or V1 command

to receive responses as words or numbers (the factory default is word responses).

IMPORTANT! The W command that enables negotiation progress responses is NOT

the same command as the W dialing modifier used in Dial command lines.

AT and extended AT command summary

+++, Switch to Command Mode, but keep data connection.

A Answer incoming call immediately.

A/ Repeat last command line.

 Zoom High Speed Modem Owner's Manual

AT ATtention characters; this prefix precedes all commands except A/.

B0 Use CCITT standards.

B1 (default) Use Bell standards.

C0 Returns an ERROR response.

C1 (default) Normal transmit carrier switching.

Dn, Dial telephone number n. Dial modifiers:LRedial the last telephone

number dialed

P (default) pulse dialing

T Touchtone dialing

W wait for dial tone,pause (2 seconds)

@ wait for 5 seconds of silenceR dial an originate-only modem; return to

Command Mode after dialing! go on-hook for .7 second

S=n dial one of four stored telephone numbers

^ turn on calling tone.

E0 Command characters not echoed.

E1 (default) Command characters are echoed.,

F0 Returns an ERROR response.

Zoom High Speed Fax/Modem Owner's Manual.................................17

F1 (default) Turn off on-line data echo.,

H0 Force faxmodem on-hook (hang up).

H1 Force faxmodem off-hook (make busy).,

I0 Faxmodem sends 3-digit product code.

I1 Faxmodem sends checksum on firmware ROM.

I2 Faxmodem performs checksum.

I3 Faxmodem sends firmware revision level.

I4 Faxmodem reports on its capabilities.

L0 Low speaker volume.

L1 Low speaker volume.

L2 (default) Medium speaker volume.

L3 High speaker volume.

M0 Speaker is always off.

M1 (default) Speaker on until carrier detected.

M2 Speaker is always on.

M3 Speaker on during answering.

N0 Connections made at speed specified by Register S37.

N1 (default) Handshaking permitted at any speed.

O0 Return to Data Mode.

O1 Return to Data Mode and initiate a retrain.

P, Set pulse dialing as default.

Q0 (default) Send responses to DTE.

Q1 Do not send responses to DTE.

Sr?, Read and display Register r value.

Sr=n, Set Register r to value n.

T, Set touchtone dialing as default.

V0 Send numeric responses.

V1 (default) Send word responses.

W0 Negotiation progress responses disabled.

W1 Negotiation progress responses enabled.

W2 Negotiation progress responses disabled. CONNECT message indicates DCE

speed.

X0 Responses 0 5/blind dialing/ignore dial tone and busy signal.

X1 Responses 0 5 and 10/blind dialing.

X2 Responses 0 6 and 10/dial tone detection.

X3 Responses 0 5, 7, and 10/blind dialing/busy signal detection.

X4 (default) All responses/dial tone and busy signal detection.

Y0 (default) Long space disconnect disabled.

Y1 Long space disconnect enabled.

Z0 (default) Reset faxmodem, use configuration profile 0.

Z1 Reset faxmodem, use configuration profile 1.

&C0 (default) Force Data Carrier Detect (DCD) ON continuously.

&C1 DCD follows the remote carrier signal., 4-

&D0 &D1 &D2 &D3 Data Terminal Ready option,depends on the &Q command in

effect.

&F, Load factory configuration profile from memory.

&G0 (default) Faxmodem accepts this command, but takes no action.

&G1 Faxmodem accepts this command, but takes no action.

&G2 Faxmodem accepts this command, but takes no action.

&J0 (default) RJ11 telephone jack.

&J1 RJ12 or RJ13 telephone jack.

&K0 Disable flow control.

&K1 (default) Enable RTS/CTS flow control.

&K2 Enable XON/XOFF flow control.

&K3 Enable transparent ON/XOFF flow control.

&L0 (default) Selects a dial-up telephone line.

Zoom High Speed Fax/Modem Owner's Manual.................................18

&L1 Selects a leased telephone line.

&M0 through &M3 Same as &Q0 through &Q3.

&P0 (default) Make/break dial ratio of 39/61 @10 pps (USA).

&P1 Make/break dial ratio of 33/67 @10 pps (UK & Hong Kong).

&P2 Make/break ratio of 33/67 @ 20 pps (Japan).

&Q0 Asynchronous operation in direct mode.

&Q1 Synchronous Mode 1: Asynchronous dialing using AT commands, switch to

synchronous mode after dialing. Synchronous &Q2 Mode 2: Dial telephone

number stored in position number 0 when DTR goes from OFF to ON.

&Q3 Synchronous Mode 3: Use handset to dial telephone number, enter

synchronous mode after DTR goes from OFF to ON.

&Q4 Modem accepts this command but takes no action.

&Q5 (default) Faxmodem negotiates an error-correction connection.

&Q6 Asynchronous operation in normal mode (speed buffering).

&Q7 Faxmodem accepts this command, but takes no action.

&Q8 Faxmodem acts as if S48=128.

&Q8 Faxmodem acts as if &Q5 is in effect with S48=7 and S46=138.

&R0 (default) Clear To Send (CTS) tracks Request To Send (RTS).

&R1 Ignore RTS, force CTS ON continuously.

&S0 (default) Force Data Set Ready (DSR) ON continuously.

&S1 DSR active during handshaking, off during testing or Command Mode.

&T0 End test in progress.

&T1 Start Local Analog Loopback Test.

&T3 Start Local Digital Loopback Test.

&T4 (default) Respond to remote modem requests for Remote Digital Loopback.

&T5 Ignore remote modem requests for Remote Digital Loopback.

&T6 Start Remote Digital Loopback Test.

&T7 Start Remote Digital Loopback Test with Self-Test.

&T8 Start Local Analog Loopback Test with Self-Test.

&V, View current profile, stored profiles, and stored numbers.

&W0 Save active configuration as profile 0.

&W1 Save active configuration as profile 1.

&X0 (default) Faxmodem provides synchronous clock on EIA pin 15.

&X1 Faxmodem accepts external synchronous clock on EIA pin 24 and relays it

on EIA pin 15.

&X2 Faxmodem derives synchronous clock from incoming carrier signal and

relays it on EIA pin 15.

&Y0 (default) Configuration profile 0 will be the active configuration

profile after faxmodem is turned on.

&Y1 Configuration profile 1 will be the active configuration profile after

faxmodem is turned on.

&Zn=x, Store telephone number x in location n.

MNP/V.42/V.42bis commands

\A0 64-character maximum MNP block size.

\A1 128-character maximum MNP block size.

\A2 192-character maximum MNP block size.

\A3 (default) 256-character maximum MNP block size.

\B, Transmit a line break to the remote modem.

%C0 Disable data compression.

%C1 (default) Enable data compression.

%D0 V.42bis dictionary size 512.

%D1 V.42bis dictionary size 1024.

%D2 (default) V.42bis dictionary size 2048.

%D3 V.42bis dictionary size 4096 for one-way compression, 2048 for two-way

compression.

\En, Optimize local echo.

%E0 Faxmodem will not retrain.

 %E1 Faxmodem will retrain.

\G0 (default) Turn off modem-to-modem flow control.

Zoom High Speed Fax/Modem Owner's Manual.................................19

\G1 Turn on modem-to-modem flow control.

\K, Defines break type.

\L0 (default) Stream MNP link mode.

\L1 Block MNP link mode.

%L Report received signal level.

%M0 Compression disabled.

%M1 Transmit compression only.

%M2 Receive compression only.

%M3 (default) Two-way compression.

\N0 Normal data link only with buffering.

\N1 Normal data link only without buffering.

\N2 Reliable link only.

\N3 (default) Auto-reliable link.

\O, Originate reliable link control.

%P, Clear encoder dictionary.

%Q, Report line signal quality.

%Sn, Set maximum sting length (V.42bis).

\T, Inactivity timer.

\U, Accept reliable link control.

\Y, Switch to reliable operation.

\Z, Switch to normal operation.

Escape characters

The characters +++ are known as the escape characters. When your faxmodem

enters the Data Mode, typing +++ allows it to escape to the Command Mode

while preserving the connection to the remote modem. This feature provides

a convenient way of letting you check or change a parameter after making a

connection with a remote asynchronous modem.

The escape characters involve:

A timed pause of 1 second (specified in Register S12).

Three keystrokes of the escape character as defined in Register S2 (the

default character is +)

Another pause (again specified in Register S12).

When you type the escape characters they are sent to the remote modem, but

they do not affect the remote modem unless the computer connected to it

echoes the escape characters back to your faxmodem's Transmitted Data input

signal.

After typing the escape characters, your faxmodem keeps its connection to

the remote modem, returns to the Command Mode to receive your commands, and

sends you the OK (or 0) response.

When you want to return to the Data Mode, type AT O or AT O1 and press the

Enter key. If you want to hang up, type ATH and press the Enter key.

IMPORTANT! Your faxmodem also hangs up if the &D2 command is in effect and

it detects an ON-to-OFF transition on the Data Terminal Ready interchange

circuit.

A  Manually answering a call

Use the A command to manually answer an incoming call. Sending the A

command tells your faxmodem to go off-hook (access the telephone line)

immediately.

If your faxmodem detects an incoming ring and displays the RING response,

you can type ATA and press the Enter key to manually answer the call. If a

successful connection is made, your faxmodem sends you one of the CONNECT

responses and enters the Data Mode. If a connection is not made, or if you

press any key on your computer keyboard while your faxmodem attempts a

connection, your faxmodem stops sending the tone, sends you the NO ANSWER

response, hangs up the telephone line, and returns to the Command Mode.

IMPORTANT! Your faxmodem does not execute commands that follow A in the

command line. If you want to include additional commands on the same

Zoom High Speed Fax/Modem Owner's Manual.................................20

command line with the A command, have them precede the A command.

 A/

@SHADEAFTER = Repeat last command line

The A/ command tells your faxmodem to repeat the last command line it

executed without having to retype it. This command is not preceded with the

AT prefix nor followed by pressing the Enter key.

For example, assume you sent the following Dial command line to the

faxmodem and received a busy signal:

AT L3 M3 X2 N0 DP 555-1212

If you want to repeat this command line, just type A/

IMPORTANT! The last-executed command line stays in your faxmodem's memory

until power is turned off, your faxmodem is reset, or you type a new

command line and press the Enter key.

 AT

Attention characters

Every command line, except the A/ command, must begin with the attention

characters (AT); otherwise, your faxmodem will not execute the command

line. Your faxmodem ascertains your serial port's transmission speed,

character length, and parity from these characters.

IMPORTANT! Your faxmodem ignores all commands that precede AT on the

command line.

 Bn

CCITT/Bell compatibility

The Bn command selects the protocol for 300 bps and 1200 bps operation.

This command is ignored when the N1 command is in effect (refer to page

4-).

B or B0

Selects the CCITT V.21 protocol when the faxmodem is operating at 300 bps

and the CCITT V.22 protocol when the faxmodem is operating at 1200 bps.

B1

Selects the Bell 103 protocol when the faxmodem is operating at 300 bps and

the Bell 212A protocol when the faxmodem is operating at 1200 bps. This is

the default setting.

Cn  Transmitter carrier

The Cn command controls the transmit carrier.

C or C0

Returns an ERROR response.

C1

Turns the faxmodem transmit carrier on when calling, answering, or

connected to a remote modem. This command is provided for communications

software requiring it. This is the default setting.

 D

Dial command

The D command instructs your faxmodem to dial a telephone number. The

format of the Dial command is:

ATD n

where n is a telephone number to be dialed and any dial modifiers you want

to include.

A typical Dial command line might be:

ATD 555 1212

which instructs the faxmodem to dial the telephone number 555-1212.

When you send a Dial command to your faxmodem, the faxmodem goes off-hook

and waits a number of seconds for a dial tone before originating a call. If

the X2 or X4 command is in effect, one second of dial tone must be detected

within 5 seconds. If the W dialing modifier is on the Dial command line,

this time limit is the value of Register S6 (default is 2 seconds).

When the time period expires, the faxmodem dials the telephone number and

Zoom High Speed Fax/Modem Owner's Manual....................................21

waits for a carrier signal from the remote modem, as specified by the value

of Register S7. If the data connection is made within the allowable time,

your faxmodem enters Data Mode and sends the appropriate CONNECT response.

Otherwise, it goes on-hook and sends the NO CARRIER response.

When pulse dialing, you can type the numbers 0 through 9 on the Dial

command line. When touchtone dialing, you can type the numbers 0 through 9

and A, B, C, D, #, and *.

If you want to control how calls are dialed, you can include the following

dialing modifiers in the Dial command line:

LRedial the last telephone number dialedPpulse dialing Ttouchtone

dialingWwait for dial tone,pause the number of seconds specified by

Register S8 (default is 2 seconds)@ wait for 5 seconds of silenceR dial an

originate-only modem; return to Command Mode after dialing! go on-hook for

.7 second (hook flash)S=ndial one of four stored telephone numbers^turn on

calling tone

These modifiers are described in the following sections.

IMPORTANT! If you want to include other commands on a Dial command line,

type them in front of the D (Dial) command. If the Dial command line only

contains the characters ATD, the faxmodem will go off-hook in originate

mode.

 L

Redial last telephone number dialed

If your faxmodem executed a Dial command line that resulted in a busy

signal, you can use the L dialing modifier to automatically redial the last

Dial command line. For example, if you send the following Dial command

line:

ATDT 555-1212

and fail to connect with the remote modem, type the following command line

and press the Enter key to automatically redial:

ATDL

IMPORTANT! Do not confuse the L dial modifier with the L command that

adjusts speaker volume.

P

@SHADEAFTERDIA = Pulse dialing

If you don't specify pulse or touchtone dialing, your faxmodem will dial

calls using pulse (rotary) dialing. If you change dialing methods and want

to return to pulse dialing, include the P dialing modifier in your Dial

command line.

Type the P modifier in front of the numbers to be pulse dialed. For

example:

ATDP 555-1212

will pulse dial the telephone number 555-1212. Your faxmodem will continue

to use pulse dialing until you specify another method.

The P modifier can be used in the same Dial command as the T modifier when

both pulse and touchtone dialing methods are required. For example:

ATDP 9 W T 555-1212

could be a typical Dial command line used in a PBX situation. This command

line tells your faxmodem to use pulse dialing to dial a 9 and get an

outside line. After waiting for a dial tone (W), your faxmodem will use

touchtone dialing (T) to dial 555-1212.

T

Touchtone dialing

If you want to use touchtone dialing, type the T dialing modifier in front

of the numbers to be touchtone dialed. For example:

ATDT 555-1212

instructs the faxmodem to dial the telephone number 555-1212 using

touchtone dialing. Your faxmodem will continue to use touchtone dialing

Zoom High Speed Fax/Modem Owner's Manual....................................22

until you specify another method or turn off the faxmodem.

The T modifier can be used in the same Dial command as the P modifier when

both touchtone and pulse dialing methods are required. For example:

ATDP 9 W T 555-1212

could be a typical Dial command used in a PBX situation. This command line

tells your faxmodem to use the pulse dialing method to dial the 9 and get

an outside line. After waiting for a dial tone (W), your faxmodem is to use

the touchtone dialing method (T) to dial the remaining numbers.

W

Wait for dial tone

Include the W dialing modifier in your Dial command line to instruct your

faxmodem to wait for a second dial tone. This modifier is useful when

dialing through a PBX or a long-distance telephone service that requires

you to wait for a go-ahead tone.

Register S7 determines the maximum number of seconds your faxmodem will

wait after receiving the W dial modifier. The S7 default is 50 seconds. If

you require a longer wait time, you can either insert multiple Ws in the

command line or change the value of Register S7.

For example:

ATDT 555-1212 WWW 98756 555-2121

tells your faxmodem to dial the telephone number 555-1212, wait up to 150

seconds for a dial tone or a go-ahead tone, provide the five-digit access

code (98756), and dial the second telephone number 555-2121.

If you will be using the W command to dial through a long-distance calling

service, you will probably need only one W to allow up to 50 seconds when

waiting for the go-ahead tone.

If the W command does not work for your application, use the Comma (,)

modifier, described next.

,

Pause

The comma (,) dialing modifier instructs your modem to pause for a fixed

amount of time while dialing (default setting is 2 seconds). This modifier

is useful when dialing through a PBX or a long-distance telephone service

that requires you to wait for a go-ahead tone.

The number of seconds your faxmodem waits is specified by Register S8.

Initially, the Register S8 default is 2 seconds. If you require additional

time, you can either insert multiple commas in the command line or change

the value of Register S8.

For example:

AT D 9,,,,,555-1212

tells your faxmodem to dial a 9 and then pauses 10 seconds before dialing

the remaining digits.

If you place a comma immediately after the D command, your faxmodem will

dial the number without listening for the first dial tone. For example:

ATD, 555-1212

This feature is especially useful when your faxmodem does not recognize the

dial tone for any reason.

@

Wait for quiet

Include the @ dialing modifier in your Dial command line when you want your

faxmodem to wait for one or more rings followed by five seconds of silence

before proceeding to the next command in the Dial command line. The amount

of time the faxmodem waits for the rings is specified by Register S7. The

Register S7 default is 50 seconds.

This feature is convenient when accessing a system that does not provide a

dial tone.

A typical Dial command line containing the @ command might look like:

ATDT 555-1212 @ 555-2121

In this example, the faxmodem dials the telephone number 555-1212 using

Zoom High Speed Fax/Modem Owner's Manual....................................23

touchtone dialing, then waits the time specified in Register S7 for five

seconds of quiet. If it detects the five seconds of quiet, the faxmodem

dials the second telephone number 555-2121 after receiving five seconds of

quiet.

If your faxmodem does not receive five seconds of quiet, it hangs up,

returns to the Command Mode, and sends you the NO ANSWER response. If your

faxmodem detects a busy signal, it hangs up, returns to the Command Mode,

and sends you the BUSY response (if you are using the X3 or X4 response set).

 R

Answer (reverse) mode

Include the R dialing modifier at the end of your Dial command line to call

and set up a connection with a modem that is capable of originating calls

only (these modems are referred to as originate-only modems).

For example, to place a call to a modem set up to operate in originate

mode, you might type:

ATDT 555-1212R

After your faxmodem dials the telephone number, it immediately enters the

answer mode and emits an answer tone. The remote modem must then be set up

to respond in originate mode.

;

Return to Command Mode after dialing

Include the semicolon (;) dialing modifier at the end of your Dial command

line when you want your faxmodem to return to Command Mode after it dials a

telephone number. Your faxmodem will not connect with a remote modem, but

will hold the line for additional commands.

This feature is convenient, for example, when you want to send information

to a telephone order service or to a bank that requires additional

touchtone information to be entered. For example, you could type:

ATDT 555-1111 ;

to have your faxmodem call your local bank, and then return to the Command

Mode. The bank may then ask you for your password, which you could provide

via your keyboard. For example:

ATDT,50954;

The ; dialing modifier is also useful if you want to execute more commands

than will fit on a 40-character command line. Just type as many characters

as will fit and type ; as the last character. When you press the Enter key,

the faxmodem will execute the command line and return to Command Mode, at

which time you can type the remaining commands.

!

Initiating a hook flash

Include the ! dialing modifier when you want your faxmodem to go on-hook

for .7 second (this is known as a hook flash). The ! modifier is

equivalent to holding down the telephone switch hook for half a second.

This modifier is useful when dialing through a PBX, where a hook flash can

be used to transfer a call. In this case, the modifier can be used to

transfer a data call to another modem set up for automatic answer.

S=n

Dial a stored telephone number

The S=n dialing modifier lets you dial one of four telephone numbers stored

with the &Zn=x command (described on page 4-). The n in DSn is the number

of the directory in non-volatile memory that holds the number you want

dialed.

For example, if directory number 2 contains the telephone number:

ATDT 1 (818) 555-1111

typing ATDS=2 and pressing the Enter key tells your faxmodem to execute

this command line and dial this telephone number.

^

Turn on calling tone

The ^ dialing modifier turns on the periodic 1300 Hz calling tone if your

Zoom High Speed Fax/Modem Owner's Manual....................................24

faxmodem originates a call. Calling tone is enabled only on a call-by-call

basis.

 En

Command echo

The En command tells your faxmodem whether to echo to your computer the

commands you send during the Command Mode.

E or E0

Turns off the echo feature. Use this command when your faxmodem is

connected to a computer that is in half-duplex (echo mode), or if you are

using BBS software.

E1

Lets you see the commands you are sending to your faxmodem during the

Command Mode. Use this command with a computer that does not echo commands

for you. This is the default setting.

 Fn

On-line character echo

The Fn command tells your faxmodem whether to echo to data from your

computer during the Data Mode.

F or F0

Returns an ERROR response.

F1

Turns off the data echo feature. This is the default setting.

 Hn

Hook switch

The Hn command controls the telephone line relay.

H or H0

Place faxmodem on-hook (hang up the telephone line). If you switched from

Data Mode to Command Mode while maintaining the connection with the remote

modem (by using the escape characters or if an ON-to-OFF DTR transition

occurred with the &D1 command in effect), use this command to disconnect

and hang up the faxmodem.

H1

Place faxmodem off-hook (pick up the telephone line).

In

Information

The In command requests information from your faxmodem.

@HEADING 3A = I or I0

Tells your faxmodem to report the product code.

I1

Tells your faxmodem to compute and report a checksum on the firmware ROM.

I2

Tells your faxmodem to compute a checksum and indicate either OK or ERROR.

I3

Tells your faxmodem to report the firmware revision level.

I4

Tells your faxmodem to report on its capabilities.

 Ln

Volume control

The Ln command controls the volume of the modem's speaker.

L or L0

Selects low speaker volume.

L1

Selects low speaker volume.

L2

Selects medium speaker volume. This is the default setting.

L3

Selects high speaker volume.

Zoom High Speed Fax/Modem Owner's Manual....................................25

 Mn

Speaker control

The Mn command controls the status of the faxmodem's internal speaker.

M or M0

Speaker is turned off.

M1

@BODY TEXT NXT = Speaker is on until the remote carrier is received. This

is the default setting.

M2

Speaker is always turned on.

M3

Speaker off when remote carrier is received and when your faxmodem is

dialing. However, speaker is on during answering.

 Nn

@SHADEAFTER = Modulation handshake

The Nn command can be used to make sure a connection is made only at a

specific speed.

N or N0

Faxmodem will handshake with a remote modem only when the speed of the

connection matches the value in Register S37. If S37 = 0, the speed must

match the speed at which the last AT characters were issued.

N1Allows handshaking to occur at any speed supported by your faxmodem and the

remote modem. The B command is ignored. Automode detection is enabled,

unless the leased line command (&L1) is in effect. This is the default

setting.

 On

Go on-line

Once your faxmodem connects with a remote modem, your faxmodem can return

to Command Mode and keep the connection with the remote modem when you

issue the escape characters or when the faxmodem experiences an ON-to-OFF

DTR transition with the &D1 command in effect. You can then use the On

command to return to Data Mode.

O or O0

Returns the faxmodem to Data Mode. This is the default setting.

O1

Returns the faxmodem to Data Mode and initiates a retrain sequence. A

retrain lets your faxmodem and the remote modem evaluate the condition of

the telephone line to maximize data transmission. This command works only

when your faxmodem and the remote modem are operating at 2400 bps or

faster.

 P

Set pulse dialing as default

P

Causes the faxmodem to assume that all subsequent dial commands are pulse

dialed. You can then omit the P dialing modifier from the dial command

lines you type.

 Qn

Faxmodem responses

The Qn command determines whether your faxmodem returns asynchronous

responses.

Q or Q0

Send responses. This is the default setting.

Q1

Do not send responses. You may want to send the Q1 command if your faxmodem

is connected directly to a printer and you do not want the responses

printed. If you send this command, you will not receive an OK response.

Q2

Return responses when originating calls, not when answering calls.

Zoom High Speed Fax/Modem Owner's Manual....................................26

IMPORTANT! If you will be receiving responses from your faxmodem, also

refer to the V and X commands, which are described on pages 4- and 4-,

respectively.

 Sr?

Read Register number r

The Sr? command lets you read the value of a faxmodem register:

Type AT S, the number of the register you want to read, and a question

mark. For example, ATS0? will read the current value of Register S0.

Press the Enter key.

Your faxmodem sends the register's value to your computer in the form of a

decimal number from 0 to 255, followed by OK.

For more information on registers, refer to Chapter 5.

 Sr=n

Set Register r to the value n

All faxmodem registers have default values that take effect when you turn

on your faxmodem. Using the Sr=n command, you can change a register value.

Type ATS, the number of the register whose value you want to change, an

equals sign, and the new value. For example, ATS0=2 will change the value

of Register S0 to 2.

Press the Enter key.

Your faxmodem sends the OK response.

IMPORTANT! Do not use this command to change values for registers S1, S13,

S14, S15, S17, S20, S21, S22, S23, S24, and S27. Refer to Chapter 5 for

more information.

 T

Set touchtone dialing as default

T

Causes the faxmodem to assume that all subsequent dial commands are

touchtone dialed. You can then omit the T dialing modifier from the dial

command lines you type.

 Vn

Response format

If you receive faxmodem responses, the Vn command lets you select whether

the responses will appear as words or numbers. The faxmodem response table

on page Quick Reference- in the Quick-Reference Guide lists the faxmodem

numeric and word responses.

V or V0

Faxmodem will send numeric responses.

V1

Faxmodem will send word responses. This is the default setting.

IMPORTANT! You can use the Qn and Xn commands to control responses (refer

to pages 4- and 4-, respectively).

 Wn

Negotiation progress reporting

The Wn command lets you receive responses over and above those provided by

the Xn command (described next). These responses report the progress of the

negotiation phase of error-correction operation, specifically the carrier

speed of the remote modem, the error-correction protocol used, and the data

compression method used (if any). The faxmodem responses table in the

Quick-Reference Guide, starting with response 40, lists the extra responses

that can be enabled. For more information, refer to Register S95 in Chapter

5 and page Quick Reference- in the Quick-Reference Guide.

W or W0

@BODY TEXT NXT = Error-correction call progress responses disabled. This is

the default setting.

W1

Error-correction call progress responses enabled.

W2

Error-correction call progress responses disabled. CONNECT response

Zoom High Speed Fax/Modem Owner's Manual....................................27

reports the DCE speed.

IMPORTANT! Register S95 can override the effect of the W command.

 Xn

Faxmodem response set and compatibility

The X command selects the response set and dialing characteristics used by

your faxmodem. Table 4-2 summarizes the responses and compatibility

provided by the Xn commands. For more information, refer to Faxmodem

responses on page 4-28.

You can also use the Qn and Vn commands to control responses.

Table 4-2. X commands

Command, Connect Response, Detect Dial Tone 1, Detect Busy Signal2

X0, CONNECT, No, No

X1, CONNECT nnn, No, No

X2, CONNECT nnn, Yes, No

X3, CONNECT nnn, No, Yes

X4(default), CONNECT nnn, Yes, Yes