Multitech CommPlete MT5634HD8 User Manual

MT5634HD8 User Guide

Title: MTSLOGOK.FH5
Creator: FreeHand 5.0

CreationDate: Fri Aug 23 16:3

MT5634HD8 User Guide
P/N 82065700, Revision A
Copyright © 1997 by Multi-Tech Systems, Inc.
All rights reserved. This publication may not be reproduced, in whole or in part,

without prior expressed written permission from Multi-Tech Systems, Inc.
Multi-Tech Systems, Inc. makes no representation 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.

Revision Date Description

A 5/15/97 Manual released.

Multi-Tech, CommPlete, RASExpress, MultiExpress, MultiExpress Fax
MultiModem, MultiModemZDX, MultiModemManager, and the Multi-Tech logo
are trademarks of Multi-Tech Systems, Inc. Other trademarks and trade names
mentioned in this publication belong to their respective owners.

Multi-Tech Systems, Inc.
2205 Woodale Drive
Mounds View, Minnesota 55112
[phone] or [phone]
U.S. Fax [phone]
Technical Support [phone]
BB S [phone] or [phone]
Fax Back [phone]
Internet{ XE "Internet" } Address: http://www.multitech.com

Federal Communications Commission Statement

This equipment has been tested and found to comply with the limits for a Class A
digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to
provide reasonable protection against harmful interference when the equipment is
operated in a commercial environment. This equipment generates, uses, and can
radiate radio frequency energy, and if not installed and used in accordance with the
instruction manual, may cause harmful interference to radio communications.
Operation of this equipment in a residential area is likely to cause harmful
interference, in which case the user will be required to correct the interference at
his own expense.

Warning: Changes or modifications to this unit not expressly approved by the party
responsible for compliance could void the user’s authority to operate the equipment.

FCC Regulations for Telephone Line
Interconnection

1. No repairs are to be made by you. Repairs are to be made only by Multi-Tech
Systems or its licensees. Unauthorized repairs void registration and warranty.
Contact Multi-Tech Systems, Inc. for details of how to have repairs made.

2. When trouble is experienced, you must disconnect your modem from the tele­phone company’s jack to determine the cause of the trouble, and reconnect your
modem only when the trouble is corrected.

3. The modem cannot be connected to pay telephones or party lines.

4. If requested by the telephone company, you must notify them of the following
before the MT5634HD8 is installed:

a. The particular phone line (phone number) to which the connection is to be

made.

b. The FCC Registration Number. (See your CC9600 Chassis User Guide for

specifics.)

c. The manufacturer’s name and model number:
Multi-Tech Systems - Model MT5634HD8

1. If the telephone company notifies you that your device is causing harm, unplug
it. The telephone company may disconnect your service if necessary and also
may change its facilities, equipment, operations or procedures which may
affect operatio n of your eq uipm ent. Where practical, the telephone c o mpan y
must promptly inform you in writing of the temporary disconnect or change in
service, give you the opportunity to make changes allowing uninterrupted
service, and inform you of your rights to bring a complaint to the FCC.

{xe "FCC regulations"}

CommPlete Communications Server iii

FCC Fax Warning{xe "fax warning"}

The Telephone Consumer Protection Act of 1991 makes it unlawful for any person to
use a computer or other electronic device to send any message via a telephone fax
machine unless such message clearly contains in a margin at the top or bottom of
each page or the first page of the transmission, the date and time it is sent and an
identification of the business or other entity, or other individual sending the
message and the telephone number of the sending machine or such business, other
entity, or individual.

See your fax software manual for setup details.

Canadian Limitations Notice{xe "Canadian Limitations Notice"}

Notice: The ringer equivalence number (REN) assigned to each terminal device
provides an indication of the maximum number of terminals allowed to be connected
to a telephone interface. The termination of a interface may consist of any
combination of devices subject only to the requirement that the sum of the ringer
equivalence numbers of all the devices does not exceed 5.

Notice: The Industry Canada label identifies certificated equipment. This
certification means that the equipment meets certain telecommunications network
protective, operational and safety requirements. Industry Canada does not
guarantee the equipment will operate to the user’s satisfaction.

Before installing this equipment, users should ensure that it is permissible to be con­nected to the facilities of the local telecommunications company. The equipment
must also be installed using an acceptable method of connection. The customer
should be aware that compliance with the above conditions may not prevent
degradation of service in some situations.

Repairs to certified equipment should be made by an authorized Canadian mainte­nance facility designated by the supplier. Any repairs or alterations made by the
user to this equipment, or equipment malfunctions, may give the telecommunications
company cause to request the user to disconnect the equipment.

Users should ensure for their own protection that the electrical ground connections
of the power utility, telephone lines and internal metallic water pipe system, if
present, are connected together. This precaution may be particularly important in
rural areas.

Caution: Users should not attempt to make such connections themselves, but should
contact the appropriate electric inspection authority, or electrician, as
appropriate.

See your CC9600 User Guide for complete Canadian Limitations information.

iv CommPlete Communications Server

v

Table of Contents

1 Introduction

Introduction ......................................................................................................... 2

Manual Organization........................................................................................... 2

LED Indicators..................................................................................................... 3

Power Supplies .................................................................................................... 3

Technical Specifications......................................................................................4

2 Installation

Introduction ......................................................................................................... 8

Safety Warnings..................................................................................................8

Pre-Installation Notes.........................................................................................9

Installation Procedure.......................................................................................... 9

3 AT Commands .................................................... 11

Working with AT Commands ..............................................................................12

Modes of Operation .........................................................................................12

Command Structure..........................................................................................12

Command Editing............................................................................................13

Dialing Commands .............................................................................................15

Dial Modifier Commands....................................................................................16

Phone Number Memory Commands ......................................................................18

Configuration Storage and Recall Commands.......................................................19

Modem Response (Result Code) Commands...........................................................20

Online Connection Commands..............................................................................22

RS-232 Interface Commands ................................................................................24

Error Correction and Data Compression Commands...............................................25

Immediate Action Commands..............................................................................26

Flow Control Commands......................................................................................27

Escape Sequences.................................................................................................30

Diagnostic Commands.........................................................................................31

Speaker Settings.................................................................................................31

4 S-Registers

Introduction ........................................................................................................34

S-Registers .........................................................................................................34

Reading and Assigning S-Register Values ............................................................38

Examples of Assigning Values..........................................................................38

Examples of Reading Values ............................................................................39

AT Commands that Affect S-Registers.................................................................39

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5 Warranty, Service, and Technical Support

Limited Warranty..............................................................................................42

Service...............................................................................................................42

Technical Support .............................................................................................. 43

Recording Product Information......................................................................... 43

The Multi-Tech BBS...........................................................................................44

Logging onto the Multi-Tech BBS.....................................................................44

Downloading a File.........................................................................................44

Reading a Message .......................................................................................... 45

Leaving a Message .......................................................................................... 45

Bulletins.........................................................................................................46

About CompuServe ............................................................................................. 46

About the Internet .............................................................................................. 46

About the Multi-Tech Fax-Back Service..............................................................46

Upgrading the MT5634HD8 Firmware ................................................................ 47

Using FlashPro to Upgrade Firmware .............................................................. 47

Appendix A ASCII Conversion Chart ........................50

Appendix B Dial Pulses and Tones .......................... 51

Appendix C Result Code Summary.......................... 53

Appendix D S-Register Summary ...........................55

Appendix E AT Command Summary........................ 57

Glossary ............................................................... 65

Index .................................................................... 81

vi CommPlete Communications Server

1 Introduction

CommPlete Communications Server 1

MT5634HD8 User Guide

Introduction

The Multi-Tech MT5634HD8 is a high speed, high density modem card for the
CommPlete Communications Server. Each MT5634HD8 card contains eight inte­grated 56Kflex modems. Each modem on the MT5634HD8 card can be configured
independently of the others via RASexpress Software or the CommPlete
Communications Server’s MR9600 controller, which can support and control up to 12
modem cards per rack. Users dial into the MT5634HD8’s modems through a T1
daughter card on the RASCard that controls the segment. There are no external
connectors.

Three MT5634HD8 cards must be installed per T1 segment. With eight modems per
card, the CommPlete Communications Server can support up to 24 simultaneous data
lines per segment, or 96 per CommPlete Communications Server

The MT5634HD8 operates as an enhanced ITU-T V.34 dial-up modem with a maxi­mum K56flex speeds, and is a fully digital K56flex server. As such, it includes the
advanced features of Multi-Tech standalone modems such as the popular
MultiModemZDXb.

The MT5634HD8 is registered by the { xe "FCC regulations"} FCC for direct
connection to the public telephone networks. No Data Access Arrangements ({xe
"DAA"}DAAs) are required.

The MT5634HD8 is fully compatible with the standard AT command set, and is
therefore compatible with all popular communications software packages.

This user guide will help you to install, configure, test, and use the MT5634HD8.

Manual Organization{xe "manual organization"}

Chapter 1 Introduction

This chapter describes the MT5634HD8 and its LED indicators, gives its technical
specifications, and provides a guide to the organization of the manual.

Chapter 2 Installation

This chapter describes how to install the MT5634HD8 into the CC9600 chassis.

Chapter 3 Command Mode Operation

This chapter provides an introduction to MT5634HD8 command mode fundamentals,
followed by a detailed explanation of each AT command, providing examples
where applicable.

Chapter 4 S-Registers

This chapter describes the MT5634HD8’s S-registers, which are used to store
various modem options.

Chapter 5 Warranty, Service, and Technical Support

This chapter provides the terms of the MT5634HD8’s warranty, instructions for
obtaining factory service, and information about Multi-Tech’s BBS and technical
support. Information on upgrading the MT5634HD8’s firmware is also provided.

2 CommPlete Communications Server

Appendix A ASCII Conversion Chart
Appendix B Dial Pulses and Tones
Appendix C Result Code Summary
Appendix D S-Register Summary
Appendix E AT Command Summary
Appendix F Remote Configuration
Glossary
Index

LED Indicators

The MT5634HD8 has 16 LED indicators{ XE "indicators" }{ XE "LED indicators" } on
the front panel, two for each modem:

CD Carrier Detect. {xe "CD signal"} The CD LED lights when the modem detects

a valid carrier signal.

1 Introduction

OH Off Hook/Out of Service. The OH LED lights when the modem is off hook,

which occurs when the modem is dialing, online, or answering a call. The LED
flashes when the modem is in the { xe "busy-out state"} busy-out or {xe "out-of­service state (OOS)"}out-of-service state.

Power Supplies {xe "power"}

DC voltages are supplied to all modems in the CC9600 rack through two PS9600
universal input switching power supplies designed for conventional 115 or 230 VAC
input. The power supplies are designed for redundant, fail-safe operation. If one
should fail, the other can supply the power requirements of the entire CommPlete
Communications Server. Each PS9600 power supply has one LED indicator that
indicates the presence of all supply voltages.

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MT5634HD8 User Guide

Technical Specifications{ XE "specifications" }{xe

"technical specifications"}

Model Number MT5634HD8
Data Rates (Modem)Eight independent modems (Modem A, B, C, D, E, F, G, H),

each operating as follows:
Downloads at speeds to 56K bps when calling a fully digital

K56flex server (actual connect speed depends on line
conditions).

Uploads and other connections at 33,600, 31,200, 28,800,
26,400, 24,000, 21,600, 19,200, 16,80 0, 14 ,400, 12,0 00, 9 600, 4800,
240 0, 12 00, or 0-3 00 b ps

Data Rates (Fax) 14,400, 9600, 4800, and 2400 bps
Data Format

(Modem)
Configuration Each of the card’s modems is independently configurable
Compatibility

(Modem)
Compatibility (Fax) ITU-T Group 3, T.4, T.30, V.21, V.27ter, V.29, V.17, and EIA

Error Correction ITU-T V.42 (MNP® Classes 3 and 4, and LAP-M)
Data Compression ITU-T V.42bis (4:1 throughput) or MNP 5 (2:1 throughput)
Speed Conversion Serial port data rates adjustable to 300, 1200, 2400,

Flow Control XON/XOFF, CTS/RTS
Mode of Operation Half or full duplex over dial-up lines; automatic or manual

Intelligent Features Fully AT command compatible; auto dial; redial; repeat

Serial, binary, asynchronous at all data rates

ITU-T V.42bis, V.42, V.34, ITU-T V.32bis, V.32, V.25bis,
V.21, V.22bis, V.22, V.23, V.17, Bell 212A* and 103/113*

TR29.2

4800,9600, 19,200, 38,400, 57,600, and 115,200 bps

dialing, automatic or manual answer

dial*; pulse or tone dial; dial pauses; call status display;
auto-parity and data rate selection; keyboard-controlled
modem options; nonvolatile memory; on-screen displays of
modem parameters, stored telephone numbers, and help
menus.

AT Commands 100% compatible with standard AT command set
Command Buffer 40 characters
Automatic Dialing Standard AT command asynchronous dialing
Modem Modulations FSK at 300 bps, PSK at 1200 bps, QAM at 2400, 4800, and 9600

Fax Modulations V.21 CH2 FSK at 300 bps

4 CommPlete Communications Server

bps (non-trellis), QAM with trellis-coded modulation (TCM)
at 9600, 12,000, 14,400, 16,800, 19,200, 21,600, 24,000, 26,400,
28,800, 31,200, and 33,600, and 56000 bps

V.27ter DPSK at 4800 and 2400 bps
V.29 QAM at 9600 and 7200 bps

V.17TCM at 14400, 12000, 9600, and 7200 bps

1 Introduction

Carrier Frequencies
ITU-T V.34

Carrier Frequencies:
AT&T V.32terbo/
ITU-T V.32bis/V.32

Carrier Frequencies:
V.22bis/V.22 or
Bell 212A Standard
(2400 & 1200 bps)

Carrier Frequencies:
Bell 103/113
(300 bps)

Carrier Frequencies:
V.21

1600, 1646, 1680, 1800, 1829, 1867, 1920, 1959, 2000 Hz

1800 Hz

Transmit originate:
Transmit answer:
Receive originate:
Receive answer:

Transmit originate:

1200 Hz
2400 Hz
2400 Hz
1200 Hz

1270 Hz mark
1070 Hz space

Receive originate:

2225 Hz mark
2025 Hz space

Transmit answer:

2225 Hz mark
2025 Hz space

Receive answer:

1270 Hz mark
1070 Hz space

Transmit originate:

980 Hz mark

1180 Hz space

Receive originate:

1650 Hz mark
1850 Hz space

Transmit answer:

1650 Hz mark
1850 Hz space

Receive answer:

980 Hz mark
1180 Hz space

Carrier Frequencies:
V.23

Transmit originate:

Receive originate:

390 Hz mark

450 Hz space
1300 Hz mark
2100 Hz space

Transmit answer:

1300 Hz mark
2100 Hz space

Receive answer:

390 Hz mark
450 Hz space

Fax Modulations V.21Ch2 FSK at 300 bps

V.27ter DPSK at 4800 and 2400 bps
V.29 QAM at 9600 and 7200 bps
V.17 TCM at 14400, 12000, 9600, and 7200 bps

Fax Carrier
Frequencies

V.21 CH2 (half duplex)
1650 Hz mark, 1850 Hz space for transmit originate
1650 Hz mark, 1850 Hz space for transmit answer
V.27ter: 1800 Hz Originate/Answer
V.29 QAM: 1700 Hz Originate/Answer
V.17 TCM: 1800 Hz Originate/Answer

Transmit Level -13 dBm
Frequency Stability +0.01%
Receiver Sensitivity -43 dBm under worst case conditions

CommPlete Communications Server 5

MT5634HD8 User Guide

AGC Dynamic Range 43 dB
Interface TIA / EIA RS-232/ITU-T V.24/V.28
Diagnostics Power-on self-test, local analog loop, local digital loop,

Firmware Upgrades Flash memory; available on Multi-Tech’s BBS
Indicators LEDs for Carrier Detect and Off Hook/Out-Of-Service
Environmental Temperature range: 0°–50° C (32°–120° F)

remote digital loop.

Humidity range: 20–90% (noncondensing)

Power
Requirements{ x e

5 VDC at 0.95 A
±16 VDC at 0.1 A

"power"}
Power Consumption Approximately 6 watts
Dimensions{ x e

23.3 x 2.3 x 29.2 cm (9.2 x 0.9 x 11.5 in.) H x W x D

"dimensions of
MT5634HD8"}

Weight 1.1Kg (2.5 lb.)
Limited Warranty Two years
Fuses{xe "fuses"} F1 (+5 V), F2 (-16 V), F3 (+16 V)

6 CommPlete Communications Server

2 Installation

CommPlete Communications Server 7

MT5634HD8 User Guide

Introduction

This chapter describes how to install{ XE "installation" } the MT5634HD8 modem
card into a CommPlete Communication Server CC9600 chassis{ XE "CC9600 chassis"
} . This equipment should be installed only by a qualified service person.

The MT5634HD8 assembly consists of a high-density modem card and a front panel{
XE "front panel" } . Figure 1 shows the layout of the MT5634HD8 card. The
MT5634HD8 assembly plugs into power and data, Ethernet, and T1 bus connectors on
the inside of the CC9600 chassis{ XE "CC9600 chassis" } . There are no external
connectors.

48 pin

96 pin

Connectors

24 pin

LEDs

Figure 1. MT5634HD8 modem card.

Safety Warnings{xe "safety"}{ XE "warnings" }

✔ Never install telephone wiring during a lightning storm.
✔ Never install telephone jacks in wet locations unless the jacks are specifically

designed for wet locations.

✔ Never touch uninsulated telephone wires or terminals unless the telephone line

has been disconnected at the network interface.

✔ Use caution when installing or modifying telephone lines.
✔ Avoid using a telephone (other than a cordless type) during an electrical storm.

There may be a remote risk of electrical shock from lightning.

✔ Do not use the telephone to report a gas leak in the vicinity of that leak.

8 CommPlete Communications Server

✔ Ports that are connected to other apparatus are defined as SELV. To ensure con-

formity to EN 41003, ensure that these ports are only connected to the same type
on the other apparatus.

Pre-Installation Notes

Warning: Direct interconnection (or connection by way of other apparatus) of ports
marked “SAFETY WARNING see instructions for use” with any other ports
(whether or not similarly marked) may produce hazardous conditions on the
network.

MultiTech strongly urges you to consult a qualified engineer before attempting to
make this type of connection.

• All installation{ XE "installation" } must be done by a qualified service person.

• To reduce emissions, be sure to use blanking plates to cover empty slots in the

CC9600 chassis.

• Cable, wiring, and any other apparatus connected between the MT5634HD8K

modem and the point of connection to any speech band circuit shall comply with
the following:

2 Installation

1. The overall characteristics of the apparatus shall be such as to introduce no
material effect upon the electrical conditions presented to one another by
the modem and the speech band circuit.

2. The apparatus shall comprise only
a. apparatus approved for the purpose of connection between the modem

and a speech band circuit; and

b. cable and wiring complying with a code of practice for the installation

of equipment covered by this part of BS 6328 or such other requirements
as may be applicable.

Note: Such apparatus may have been approved subject to limitations in its use.

Installation Procedure

1. Unpack the MT5634HD8 assembly from its factory packaging. (You may wish
to save the packaging for possible future use.)

2. Perform a visual inspection of the MT5634HD8. If you are concerned about its
condition, call Technical Support for instructions.

3. The MT5634HD8 must be installed in a segment in which a RASCard with a T1
module is installed. Turn off the RAS segment where the MT5634HD8 will be
installed. (Turn off power to this segment.)

4. Remove a blank device front panel or previous MT5634HD8 card from the RAS
segment used in step 3. Do not remove the back panel.

CommPlete Communications Server 9

MT5634HD8 User Guide

5. Support the MT5634HD8 by the front panel and the bottom edge of the card,

6. Slide the MT5634HD8 into the CC9600 chassis{ XE "CC9600 chassis" } until

and carefully place it into the CC9600’s open device slot. Make sure the edges
of the MT5634HD8 card mate properly with the guides of the device slot.

you feel the MT5634HD8’s connectors mate with the CC9600’s bus connectors.

10 CommPlete Communications Server

2 Installation

7. Tighten the MT5634HD8’s retaining screws.

8. Repeat steps 1 through 7 for each of the MT5634HD8’s you are installing.
Three MT5634HD8’s must be installed for each RAS segment.

9. Turn on power to the RASCard segment.

10. Check the LED indicators on the RASCard and the controllers. If the LEDs on
the controller do not light, turn off the RASCard segment. Reseat the cards by
repeating steps 5 through 9. If you continue to experience problems, consult your
CommPlete Owner’s Manual for troubleshooting tips.

Note: A self-test{ XE "self-test" } runs each time the CommPlete Communications
Server is turned on. Refer to your system Owner’s Manual for more details on the
power-on self-test.

CommPlete Communications Server 11

3 AT Commands

CommPlete Communications Server 13

MT5634HD8 User Guide

Working with AT Commands

The MT5634HD8’s modems are controlled by instructions called AT commands, so
called because the attention characters{xe "AT commands:attention code"}{xe "AT
commands:AT"} AT precede each command or sequence of commands (known as a
command string){xe "command string"}. You can send commands to the modem from
your keyboard while in terminal mode, or you can use communications software to
issue these commands automatically.

The modem is in command mode{xe "command mode"} when it is not dialing or
online. When it is in command mode, you have access to a complete communications
system that allows you to use several features, including the basic AT command set
described in this chapter. Using the basic AT command set, you can enter phone
numbers for automatic dialing, configure modem options, and monitor telephone ac­tivity. In addition, you can command your modem to perform advanced features such
as error correction, data compression, speed conversion, and more.

This chapter describes the modem’s operational modes, and shows you how to use
each of the modem’s AT commands. These commands and responses are compatible
with all systems and with all data communications software using the AT command
set.

Modes of Operation

The MT5634HD8 operates in two basic functional modes: {xe "command
mode"}command mode and online mode{xe "online mode"} . (There is also an in-
between state, { xe "wait-for-carrier mode"}wait-for-carrier, in which the modem is
out of command mode but not yet online.) When you power up the modem, it is in
command mode, and is ready to accept and respond to commands from your keyboard
or software.

The modem enters online mode{xe "online mode"} after it dials, connects with
another modem, and detects a valid carrier signal. If it does not detect a carrier
signal within the time frame controlled by register S 7{xe "S-registers:S7"}{xe
"abort timer"}, the modem abandons the call and re-enters command mode.

You can make the modem enter online mode{xe "online mode"} without dialing by
typing either the D command{xe "Dial command"}{xe "AT commands:D"} or the {xe
"AT commands:A"}A command{xe "Answer command"}.

The modem exits online mode{xe "online mode"} if the carrier signal is lost or in­tentionally dropped. When this happens, the modem hangs up and re-enters
command mode.

By sending certain “escape” characters to the modem while online, you can make it
enter command mode without losing the carrier signal.

Command Structure

You can control a wide variety of modem operations and options when the modem is
in command mode. AT commands tell the modem to dial a number, to answer a call,
to operate at a certain speed, to use a certain compression technique, and many other
functions. AT commands consist of one or two letters, which may be preceded by an
ampersand (&), a percent character (%), or a slash character (\). The Q command,

14 CommPlete Communications Server

3 AT Commands

for example, determines whether the modem returns result codes, while the &Q
command select s th e asynch ronous communica ti ons mode.

A parameter{xe "parameters"}{xe "AT commands:parameters"} after a command (0,
1, 2, etc.) tells the modem which option to use. If you do not specify a parameter,
the modem assumes the 0 (zero) option. E, for example, is the same as E0. You can
issue several commands on a single line (a command string) as long as the line does
not exceed {xe "AT commands:command string limit"}40 characters.

Note: Each character in a command counts towards the 40 character command line
maximum. While Q1 is a single command, it counts as two characters in the
command line.

Each command has a valid range of parameters;{ xe "parameters"} for example, &S
can have only 0 or 1 as a parameter. Valid commands always generate an OK result
code, and a few generate an additional response, such as a list of parameters.{ xe
"result codes"} An invalid command, such as &S3, which has a parameter outside
the valid range, generates an ERROR result code. Most commands have a default
parameter{xe "parameters:default"} that is enabled when the modem is turned on
or reset with the ATZ or AT&F command. Factory defaults are stored in read-only
memory ({xe "ROM (read-only memory)"} ROM{xe "memory:read-only (ROM)"}),
and cannot be changed. User-defined defaults can be stored in nonvolatile random­access memory ({xe "NVRAM (nonvolatile random access memory)"} NVRAM{ xe
"memory:nonvolatile (NVRAM)"}), and can be changed or deleted at will.

Command Editing

{xe "AT commands:attention code"}{xe "AT commands:AT"}Always begin a
command with the letters AT. Enter the entire command string in upper or lower
case, but do not cannot mix cases within the command string. The AT command is not
executed until you press the ENTER key. Use the BACKSPACE key to erase the previ­ous command character. It will not erase the AT characters once they are typed. If
your keyboard has no BACKSPACE key, use CTRL+H. (You can change the character
recognized by the modem as BACKSPACE to any other ASCII character by changing
register S5{ xe "S-registers:S5"} { xe "backspace character"}.)

Press CTRL+X to cancel an entire command that has been typed but not yet executed.
This also clears the command buffer. The effect is the same as backspacing the
command, only quicker.

The modem stores characters entered in a command in it’s command buffer{xe
"command buffer"} until they are executed by pressing ENTER. The command buffer’s
capacity is 40 characters. The attention characters{xe "AT commands:attention
code"}{xe "AT commands:AT"} (AT) do not count towards the 40 character command
line maximum. You may use spaces for increased readability when typing a
command. Spaces are not stored in the command buffer, and they do not count
towards the40 character command line maximum. Special characters, such as
hyphens and parentheses, are not allowed.

If you exceed the 40-character limit or type invalid characters, the command buffer
is automatically erased and an ERROR message displays. You should retype the
command within the 40-character limit, using only the allowed characters.

The commands in this chapter are organized by function. A brief summary follows.

CommPlete Communications Server 15

MT5634HD8 User Guide

Table 1. AT Commands by Function

Topic Command Description Page
Dialing Action D Dial 15

Dial Modifiers L Redial last number 16

Phone Number & Z Store a phone number 18
Memory DS Dial a stored number

Configuration & W Store configuration 18
Storage & Recall &F Load factory default configuration

H On-hook/off-hook

P Pulse dialing
T Tone dialing

V Speakerphone mode

W Wait for new dial tone

, Dialing pause
; Return to command mode after dialing
! Flash on-hook

$ Detect call card tone

@ Quiet answer

^ Disable data calling tone transmission

Z Reset modem

&Y Select stored configuration on power-up

Modem Responses E Echo command mode characters 19
(Result Codes) Q Result codes: enable/disable

V Result codes: verbose/terse

\V Protocol result code

X Result codes and call progress

&Q Select asynchronous communications

mode

%B View numbers in blacklist

Online Connection B Answer tone 22

C Carrier control

F Echo online data characters

&G Guard tones

-C Data calling tone
N Modulation handshake

\T Disable inactivity timer

Y Long space disconnect

RS-232 Interface &C Carrier Detect control 24
Controls &D Data Terminal Ready control

&S Data Set Ready control

Error Correction & \N0 or &Q6 Non-error correction mode 25
Data Compression \ N 3 Auto-reliable mode

\N2 Reliable mode
%C0 Data compression disabled
%C1 Data compression enabled

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Topic Command Description Page
Immediate Action A / Repeat last command 26

I Information request
&B V.32 auto retrain
&V View current configuration

Flow Control & M0 Asynchronous mode 27

&K0 or \Q0 Flow control disabled
&K3 or \Q3 Hardware flow control
&K4 or \Q1 XON/XOFF flow control

\X0 XON/XOFF no pass-through

&J Auxiliary relay control

\J Enable data buffer control

\G Modem port flow control

\K Set break control

+ES=6 Enable synchronous buffered mode

Escape +++AT<CR> Default in-band escape sequence 30
Sequences A Force answer mode

O Go back online
Diagnostics & T Self-test commands 30
Speaker Settings L Monitor speaker volume 31

Dialing Commands

Dialing commands are used to dial and hang up.

D

s

Dial{xe "dialing:a phone number"}{xe "AT commands:D"}{xe "Dial
command"}

s = phone number
Default: none

The letter D in a command causes the modem to dial the telephone number immedi­ately following it. For example, if you type ATD5551212<CR>, the modem dials
the number 555-1212.

The MT5634HD8 supports several dialing methods. With the D command, you can
specify either pulse (ATDP) or tone (ATDT) dialing. You can also modify the
dialing command with several other characters that are explained in the section
“Dial Modifier Commands”, later in this chapter.

The modem also lets you select either smart (wait-for-dial-tone) dialing or blind
dial{xe "dialing:blind dialing"}{xe "blind dialing"}ing. With smart dialing{ xe
"dialing:smart dialing"}{xe "smart dialing"}, the modem waits for and detects dial
tone{xe "dial tone"} s and busy signal{xe "busy signal"} s. With blind dialing, the
modem works with timed pauses (determined by the value of register {xe "S­registers:S6"}S6), not dial tone and busy signal detection. See the X command for
more information on blind and smart dialing.

M Monitor speaker mode

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H

n

On-Hook/Off-Hook {xe "On-Hook/Off-Hook command" }{xe "AT
commands:H"}{xe "hanging up"}

n = 0 or 1
Default: 0

Use the H command to make the modem hang up (go on-hook) or simulate the action
of picking up a telephone handset (go off-hook).

H0 (or H) hangs up the modem
H1 brings the line off-hook, just as if you had picked up the telephone handset.
It is not necessary to use the H1 command to bring the line off-hook when using the

D command. The modem automatically goes off-hook when you press ENTER at the

end of the dial command.

Dial Modifier Commands{xe "dialing:modifiers"}

The dial string can include the digits 0 through 9, the pound sign (#), the asterisk
(*), and the letters A, B, C, or D. The latter are used by some {xe "PBX phone
systems"}PBXs; the exact function will depend on the PBX manufacturer’s feature
set and implementation. There are also several command characters, called “dial
modifiers,” that can be included within a dialing command after the letter D.
Their functions include pulse or tone dialing, pauses in the dial sequence, automatic
redials if a number is busy, and reverting to command mode or switching to answer
mode after dialing.

L Redial Last Number{ XE "redial last number" }{ XE "AT commands:L" }

Default: none
You can redial the last number dialed by entering L immediately following the dial

command (ATD). This command is handy if you encounter a busy signal and want to
try the call again.

P, T Pulse or Tone Dialing{xe "AT commands:T"}{xe "AT commands:P"}{xe

"Tone-Dial command"}{xe "Pulse-Dial command"}

Default: T
The MT5634HD8’s modems can dial numbers by using pulse dialing, tone dialing, or

a combination of both methods. Pulse dialing, used by rotary-dial telephones, uses
the timed opening and closing of a relay to encode the numbers. Tone dialing, used
by push-button (touch-tone) telephones, uses dual tone multifrequency ({xe "DTMF
(dual tone multifrequency):dialing"}DTMF) dialing.

P selects pulse dialing.
T selects tone dialing.

Insert P or T in the dialing command just before the digits you want to pulse- or tone-
dial. If neither pulse nor tone dialing is specified in the dial command, the modem
uses whatever method was used last.

Note: When your modem is first turned on or reset, it uses the tone dialing method,
(which is the default), even if you do not include T in your dial command.

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Examples:

To pulse-dial the number 555-1212, type ATDP5551212 and press ENTER.
To tone-dial the same number, type ATDT5551212 and press ENTER.
To call out of a {xe "PBX phone systems"} PBX (switchboard) system where a 9 has

to be pulse-dialed, and the rest of the number has to be tone-dialed after pausing
for a second dial tone, type ATDP9,T5551212 and press ENTER. (The comma causes
a pause.)

V Switch to Speakerphone Mode{xe "AT commands:V"}{xe "Switch to

Speakerphone Mode command"}

Inserting V into the dialing command causes the modem to switch to speakerphone
mode and dial the following number. Use ATH to hang up.

W Wait for New Dial Tone{xe "AT commands:W"}{xe "Wait for New Dial

Tone command"}

Inserting W into the dialing command causes the modem to wait for another dial
tone before it resumes dialing. (It is not necessary to enter W at the beginning of the
dialing command.)

Note: Because the modem must be able to detect the dial tone for this command to
work, you also must select wait-for-dial-tone dialing with the { xe "Result Codes
and Call Progress Selection command"}{xe "AT commands:X"}X2 or X4 command.

, Dialing Pause{xe "Dialing Pause command"}{xe "AT commands:,

(comma)"}

Enter a comma in the dialing string to make the modem pause while dialing. This
pause lasts two seconds (North American models) or four seconds (U.K. and Interna­tional models) for each comma entered. You can force longer pauses by entering
multiple commas, or you can change the length of the pause caused by a comma by
setting register S8{ xe "S-registers:S8"} { xe "dialing:pause time"} to any value from
0 through 255 seconds (North American), 4 through 7 seconds (U.K.) or 4 through 255
seconds (International).

Note: Each comma in a dialing command counts as one of the 60 allowed characters.

; Return to Command Mode After Dialing{xe "Return to Command Mode

command"}{xe "AT commands:; (semicolon)"}

Enter a semicolon (;) as the last character of a dialing command to cause the modem
to return to command mode immediately after executing the command instead of
waiting for a carrier signal and going online.

For example, type ATDT5551212; to tone-dial the number and immediately go
back into command mode. The semicolon is useful when modem data transfer is not
desired, as in voice communications, or in applications using touch tones as a data
entry method, such as bank-by-phone.

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! Flash On-Hook {xe "AT commands:! (exclamation mark)" }{xe "Flash

On-Hook command"}

Some switchboard systems react to a momentary on-hook condition. Insert an excla­mation mark into the dialing command to cause the modem to “flash” on-hook for
half a second, just as if you had pressed the switch hook on a telephone set for half
a second. (With U.K. models, the exclamation mark causes the modem to flash on­hook for 90 milliseconds.)

For example, to flash on-hook to transfer to extension 5678 after dialing the number
555-1234, type ATDT5551234,,!5678. The commas cause a 4-second pause.

$ Detect Call Card Tone{xe "Quiet Answer command"}{xe "AT

commands:@"}

Use the $ command to dial services that require you to enter your call card number
after a tone. The $ character in the dialing string causes the modem to pause and
wait for an AT&T call card “bong” or a 1600 Hz tone. When the modem detects the
tone, it processes the rest of the dialing string. If it does not detect the tone within
the time set in register S7, the modem stops processing the dial string with a NO
CARRIER message. Pressing any key also terminates the $ command.

@ Quiet Answer{xe "Quiet Answer command"}{xe "AT commands:@"}

Use the @ command to access a system that does not provide a dial tone. The @
command causes the modem to wait before processing the next character in the dial­ing string. The wait is for one or more rings back followed by five seconds of silence.

For example, ATDT5551212@6313550 causes the modem to dial the first number
(555-1212), then wait for the time specified in register S7{ xe "S-registers:S7"}{xe
"abort timer"} for at least one ringback and five seconds of silence. If the modem
detects a busy signal{ xe "busy signal"}, it hangs up and generates a BUSY result code.
If it does not detect five seconds of silence, it hangs up and generates a NO ANSWER
result code. If it does detect five seconds of silence, it dials the second number (631-

3550).

^ Disable Data Calling Tone Transmission{xe "Disable Data Calling Tone

Transmission command"}{xe "AT commands:^"}

Use the ^ command to disable the transmission of data calling tones.
In the following example, the ^ command is used to tone dial 555-1212 and suppress

data calling tone transmission.

ATDT^5551212

Phone Number Memory Commands

The modem can store up to four telephone numbers in nonvolatile memory{xe
"NVRAM (nonvolatile random access memory)"}{xe "memory:nonvolatile
(NVRAM)"}. You can store the numbers with the &Z command and dial them with
the ATDS command.

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3 AT Commands

&Zn=sStore a Phone Number{xe "AT commands:&Zn=s"} {xe "Store Phone

Number command"}

s = phone number n= 0, 1, 2 or 3
Default: none

You can store a telephone number string in the modem’s phone number memory. You
can store four of these strings using the &Zn=s command. The memory locations are
labeled N0 through N3.

For example, the telephone number 1-612-555-1212 is stored at memory location N2
by typing &Z2=16125551212 and pressing ENTER.

DSnDial a Stored Number{xe "AT commands:DSn"}{xe "dialing:a stored

number"}{xe " Dial a Stored Number command"}

n = 0, 1, 2, or 3
Default: none

You can automatically dial a telephone number that is stored in the modem’s
number memory by typing ATDSn, where n = 0 through 3. For example, you can dial
a number stored at N2 by typing ATDS2 in terminal mode and pressing ENTER.

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Configuration Storage and Recall Commands

The MT5634HD8 stores parameters{ xe "parameters"} in two places. It stores factory
default parameters in read-only memory ({ xe "ROM (read-only memory)"} ROM),
and{ xe "memory:read-only (ROM)"}{xe "memory:nonvolatile (NVRAM)"} custom­ized parameters in { xe "NVRAM (nonvolatile random access memory)"} nonvolatile
random access memory (NVRAM){xe "memory:nonvolatile (NVRAM)"} . You cannot
change the default parameters in ROM, but you can change parameters in
temporary memory and then store them in NVRAM as custom settings. You can then
recall the custom settings as if they were factory default settings.

&WnStore Configuration{xe "storing a configuration"}{xe "AT

commands:&W"}{xe "Store Configuration command"}

n = 0
Default: &W0

The &W command stores current AT commands and S-register values in nonvolatile
memory, so you won’t lose your custom settings when you turn off the modem or reset
it.

&W0 (or &W) stores all current AT command and S-register values in {xe "NVRAM
(nonvolatile random access memory)"} nonvolatile random access memory
(NVRAM){xe "memory:nonvolatile (NVRAM)"} and configures the modem so that
it reads your custom settings in NVRAM when the modem is turned on or when it is
reset with the Z command. The &F reset command will continue to read the factory
default settings in ROM.

&F

Z

n

&Y

n

Load Default Configuration{xe "AT commands:&F"}{xe "Load Default
Configuration command"}

n = 0
Default: &F0

MT5634HD8 modems store factory default AT command settings and S-register val­ues in {xe "ROM (read-only memory)"}read-only memory (ROM){xe "memory:read­only (ROM)"}; they store your custom AT command and S-register values in {xe
"NVRAM (nonvolatile random access memory)"}nonvolatile random access memory
(NVRAM){xe "memory:nonvolatile (NVRAM)"}.

The &F0 (or &F) command resets the modem to the factory default values stored in
ROM.

Reset Modem{ XE "AT commands:Z" }{ XE "Reset Modem command" }

n = 0 or 1
Default: none

The Z command resets the modem to the configuration last saved by the &W
command. The default values come from the customized configuration in NVRAM.

Z1 is the same as Z0, and functions identically.

n

Select Stored Configuration for Hard Reset{ XE "AT commands:&Y" }{
XE "Select Stored Configuration for Hard Reset command" }

n = 0
Default: 0

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This command is included for compatibility with applications that issue the &Y0
command. Modem functions are not changed.

&Y0 selects the profile stored at location 0 on power-up.

Modem Response (Result Code) Commands

The MT5634HD8’s modems can give responses to commands. The most common one is
OK, but the modems can also alert you or your software to dial tones, busy signals,
connection speeds, and whether the connection is made with error correction or
compression enabled. These responses are called result codes{xe "Result codes"} , and
they can be terse (numbers) or verbose (text).

E

n

Echo Command Mode Characters{xe "AT commands:E"}{xe "Echo
Command Mode Characters command"}

n = 0 or 1
Default: E1

Normally, when you type commands on the keyboard, the modem echoes the char­acters back to the computer or terminal, which displays them on the monitor. Use
the E command to turn this feature off and on.

3 AT Commands

Q

V

E0 disables the echo.
E1 enables the echo.

n

Result Codes Enable/Disable{xe "result codes:enable/disable"}{xe "AT
commands:Q"}{xe "Result Codes Enable/Disable command"}

n = 0 or 1
Default: Q0

You can use the Q command to enable or disable result codes{xe "result codes"} for
applications such as computer-controlled auto dialing.

Q0 (or Q) enables result codes.
Q1 disables result codes for applications such as computer-controlled auto-dialing.

n

Result Codes (Verbose/Terse){xe "AT commands:V"}{xe "result
codes:verbose/terse selection" }

n = 0 or 1{xe "Result Codes (Verbose/Terse) command"}
Default: V1

The V command controls whether the modem’s result codes{xe "result codes"}
display as text (“verbose”) or numeric (“terse”) messages. For example, if no carrier
signal is detected after dialing, the result can be displayed either as NO CARRIER,
or as the number 3.

V0 (or V) displays the modem’s result codes as a number.
V1 displays result codes as text.

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X

n

Result Codes and Call Progress Selection{xe "AT commands:X"}{xe
"result codes:call progress selection"}{xe "Result Codes and Call
Progress Selection command"}

n = 0, 1, 2, 3, 4, 5, 6, or 7
Default: X4

The X command selects which result codes the modem provides in command mode
and whether the modem uses “smart dialing{ xe "dialing:smart dialing"}{xe "smart
dialing"}” or “blind dialing”. When it smart dials, the modem listens for dial tones
and busy signals and responds to them. When it blind dials{xe "dialing:blind
dialing"}{xe "blind dialing"}, the modem ignores the signals and relies on timing
instead.

X0 causes the modem to blind dial. Instead of looking for a dial tone, it pauses for
the time set in register S6{ xe "S-registers:S6"}{ xe "dial tone:wait time"} and then
dials regardless. Once a connection has been made, it sends the Bell 103 basic code

CONNECT to the terminal. It ignores any busy signal{xe "busy signal"}s.
X1 causes the modem to blind dial, but in addition to the basic CONNECT code it pro-

vides {xe "Result codes:extended codes"}extended codes{xe "Extended codes"}
consisting of the word CONNECT and the speed of the connection (CONNECT 14400
or CONNECT 28800, for example). In this mode, the modem does not recognize or
respond to dial tones or busy signals.

X2 causes the modem to wait for a dial tone before dialing. If it does not detect a
dial tone within the time set by S6{ xe "S-registers:S6"}{ xe "dial tone:wait time"},
the modem sends a NO DIALTONE result code to the terminal. In this mode, the
modem provides {xe "result codes:extended codes"}extended result codes{xe "result
codes"} , but does not respond to busy signals.

X3 causes the modem to blind dial, but also it looks for a busy signal{xe "busy
signal"}, and if it detects one, it sends a BUSY result code to the terminal. In this
mode, the modem provides {xe "result codes:extended codes"}extended result
codes{xe "result codes"}, but it does not respond to dial tones.

X4 causes the modem to look for a dial tone and a busy signal{xe "busy signal"} , and
respond with NO DIALTONE or BUSY, as appropriate. It also provides { xe "result
codes:extended codes"}extended result codes{xe "result codes"}. It is the most useful
setting for most data communication programs, and is the default setting.

X5 causes the modem to look for a dial tone and a busy signal, and response with NO
DIALTONE or BUSY, as appropriate. It also provides { xe "result codes:extended

codes"} extended result codes{xe "result codes"}. It is the most useful setting for most
data communication programs, and is the default setting.

X6 causes the modem to look for a dial tone and a busy signal{xe "busy signal"}, and
respond with NO DIALTONE or BUSY, as appropriate. It also provides { xe "result
codes:extended codes"}extended result codes{xe "result codes"}. It is the most useful
setting for most data communication programs, and is the default setting.

X7 causes the modem to wait for a dial tone before dialing. If it does not detect a
dial tone within the time set by S6{ xe "S-registers:S6"}{ xe "dial tone:wait time"},
the modem sends only the basic result code to the terminal (ERROR, NO CARRIER, or
CONNECT, for example). In this mode, the modem does not respond to busy signals.

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