US Robotics COURIER HST with ASLCOURIER HST FAX™ with ASL, COURIER HST Dual Standard with ASL, COURIER HST Dual Standard FAX with ASL, COURIER V.32 bis FAX with ASL User Manual

-

lli1

'ilobotics

®

-

-

COURIER
HIGH

SPEED

MODEMS

COURIER
COURIER

COURIER
COURIER V.

COURIER HST™
COURIER

™

HST

Dual Standard™

HST

Dual Standard

V.32

bis™

32

bis

FAX™

with

HST

FAX™

with

ASLTM
with

ASL™
with

ASL™

with

FAX™

ASL™

ASL™
with

ASL™

~

USER'S

MANUAL

lliHllobotics

®

COURIER
HIGH

SPEED

MODEMS

COURIER
COURIER

COURIER
COURIER

COURIER HST™
COURIER

™

HST

Dual Standard™

HST

Dual Standard

V.32

bis™

\/.

32

bis

FAX™

with

HST

FAX™

with

ASL™
with

FAX™

ASL™
with

ASL™

ASL™

with

ASL™
with

ASL™

USER'S

MANUAL

~1992

by

U.S.

IL

Robotic.,

60076

8100 North McCormick Blvd.
Skokie,
All Rights Reserved

Inc.

COURIER HIGH SPEED MODEMS

HOW TO USE THIS MANUAL

This

manual
Courier
modems
to

connect

HST.

Courier

signaling,
As

you

•

•

• All

contains

HST,

and

have

identical features except for

with

HST

depending

use

the

The

modem
tions except for its flow control setting,
on

the

type
you've
(Chapter
Chapter

If

you've
disregard
HST operations. Conversely, if
Courier
concerning

Courier

with

remote

7200/

4800/2400/1200/300

modems

Compatibility

connect

operating

Courier

remote

manual,

set

3 for brief

HST

with

modems

Dual

on

is

shipped

of

software

up

the

2)

review

purchased a Courier

the

instructions

modem,

V.32/V.32

high

modems

observe

in

Chapter

other

instructions

HST

Dual

at
Standard
the

type

of

keep

the

following

ready

and

modem

the

Quick-Start

configuration

disregard

bis

speed

modems

operating

the

standards

1.

Courier

for

Standard

the

high

speeds: V.32/V.32

modems

remote

machine

and

in

this

operations.

bps,

Courier

HST

use

modem.

guidelines

for

most

tested

instructions

guidelines.

V.32

bis

manual

you've

the

instructions

connect

at

14.4K/12K/9600/

as

long

listed

HST

modems

Courier

modems.

signaling

either

dial-up

which

you're

its

using. After

operation

modem,

concerning

purchased

automatically

as

the

under

modems

at

16.SK bps.

V.32

These

they

bis

type

of

in

mind.

applica-

depends

in

a

remote

also

bis,

use

or

-

-

-

-

-

-

-

-

-

A

NOTE

ii

How

ON

COMMUN/CATIONS SOFTWARE

If

you're

using a computer
communications
which

are

Some

users

of

the

modem,
makes
that
times,
hand.
(Chapter
modem's

to

Use

the

allows

and

Whichever

3)

requirements

This

Manual

based

prefer

and

modem

them

their

software

so

that

software.

on

the

modem's

their

communications

are

more

almost

to

use

the

you

prefer,

you

have
and

transparent.

at

rather

than

Many

brands

AT

comfortable

modem's

other

times,

review

a basic

operation.

a terminal,

are

available, all

command

Others

AT

depending

at

least

understanding

set.

software

with a program

prefer a program

command

the

Quick

you

to

set

on

of

need

take

some-
the

Start

the

of

control

that

task

at

-

-

-

-

-

-

-

COURIER HIGH SPEED MODEMS

-

-

USER PATHS

The
for
path

Features

Compatibility

Set-up

Testing

Synchronous

Calls

Synch.

Operations

paths

new

for

All

Users

Ch.1

Ch.

I

Ch.

2

&

7

shown

and

experienced

HST-mode

&

in

New

Users

I

Ch.

4

Interface

Controls

I

Ch.

5

Internal

Controls

the

or

V.32

,__

diagram

users.

bis

mode

Asynchronous

r-

I I

-I

Glossary

L-,--1

r-1-,

I

Ch.

Inquiries/

I

HELP

L

__

are

suggestions

Note

that

operation.

Calls

- ,

I

8 I

I

_j

there

Advanced

Users

Ch.

Quick

Start

In

Ch.

Throughput

Guidelines

only,

is

I

3

4

no

separate

designed

r--,

I

In

Ch.

ATl6--Link I

I

Diagnostics

L

__

8 I

_j

-

-

-

-

I

App.

Ch.

6

Dialing

&

Answering

Dashed lines indicate optional references. Additional points of reference:
Page Page

3-1

HST and V.32/V.32 bis Modes E-2
B-4 Front Panel Indicators
B-9 Nonvolatile

Your Defaults
B-12 S-Registers

Memory-Storing

A

Error

Control,

Compression

E-3
Quick Configuration Guide
Quick Reference Card

How

In

Fax

Operations
(Fax modems only)
Voice/Data Switch

to

Use

App.

Default

Settings

This

B

Manual

iii

-

-

-

-

-

-

-

-

-

The USRobotics logo
Robotics, Inc.
Standard, Courier
Courier V.32
Leveling (ASL) are
registered
3000 is a
PC/XT,
trademarks
Networking
Touch-Tone is a
Telegraph.

Courier

HST

bis

Fax, Total Control,

trademarks

trademark

trademark

PC/

AT

and

of International Business Machines Corp. Microcom

Protocol (MNP) is a

trademark

and

HST

HST,

Dual

of

Apple

of

Hewlett

Systems

are

registered

Courier

Standard

Network

of American Telephone

HST Fax,

and

of U.S. Robotics, Inc.

Computer,

Packard

trademark

trademarks

Courier

Fax,

Courier

Adaptive

Inc.

Company.

Architecture (SNA) are

Speed

Hewlett

of Microcom, Inc.

of U.S.

HST

V.32

bis,

Apple

Packard

IBM PC,

and

-

-

-

Dual

-

is a

-

-

-

-

-

COURIER HIGH SPEED MODEMS

-

-

-

-

-

-

How

to Use this
Table of
Limited
FCC Registration
DOC
Connecting
Radio
For

Chapter

Chapter

Contents

Warranty

(Canada)

to

the

and

Television Interference xii

Canadian

PART

Introduction
Compatibility

Package
Operational

RS-232

Switches
Front
Installing
Testing

Modem

I.

1-Features

2-Set-Up

Components

Requirements

Requirements

Panel

Indicators

the

the

Installation

TABLE OF CONTENTS

Manual

Numbers

Telephone

INSTALLATION AND OPERATION

and

and

Modem

Company

Users xiii

Compatibility

Testing

ii
v

x

xi

XI
XI

1-1
1-4

2-1
2-1
2-2
2-3
2-4
2-4
2-7

-

-

-

-

-

Chapter

Chapter

3-Quick
Asynchronous I Synchronous
Initial

Modem
Recommended
Alternative

Data

Format
Storing
Dialing
Link Rate
Online

Terminology
Changing
High
Modulation
Throughput

Defaults

Fallback

4-Interface

Speed

Start:

Settings

Settings

Settings

in

Nonvolatile

Negotiation

Controls

Settings

Modulation:
at

2400

bps

Guidelines

Asynchronous

Communication

Memory

V.32

bis/HST

and

Below

Calls

Table

3-1
3-1
3-2
3-3
3-4
3-5
3-5
3-5
3-6

4-1
4-2
4-2
4-3
4-3

of

Contents v

COURIER HIGH SPEED MODEMS

-

Error

Control

With

Flow

Control
Transmit
Received
Transmit

When
Hardware
Software
Guidelines

Received

Hardware
Software
Guidelines

Data

Compression

Data Rate

Software
DTE Rate Select (&Bn)
Link Rate Select (&Nn)

Data

Set

Data

Terminal
Carrier
Rack

Controller

Touch-Tone Recognition

Chapter

5-Internal

Setting/Using

Writing
Loading
Reset (Z)
Storing a
Storing

Result

Local Echo

The

Modem

Codes
Response
Quiet
Additional
Result

Command
Online

Audio

Speaker

(&Mn)

Auto

Answer

Overview

Data

Buffer Sizes

Data

Buffer Size

Data

Flow

it is

Required

Control

Control

Data

Flow

Control

Control

Commands

Requirements

Ready

Detect (&Cn)

Mode

Clock

(&Sn)

Ready

Unit

Defaults

Defaults to

the

Factory Defaults (&F)

Command

Telephone

Modes

(Qn)

Result

Code

Sets (Xn)

Mode

Local Echo (Fn)

Monitor
Control

Usage

Control

Control

(Rn)

(&In)

(&Kn)

(&On)

Access (%Rn)

(%

Tn)

Controls

NVRAM

String (&ZC=s)

Numbers

(Vn)

Code

Subsets (&An)

Local Echo (En)

(Mn)

(Kn)

(&Hn)

(&W)

(&Zn=s)

4-5
4-6
4-6
4-6
4-6
4-7
4-7
4-7
4-7
4-8
4-9
4-9

4-9
4-11
4-12
4-13
4-13
4-14
4-15
4-16
4-17
4-18
4-18
4-18

5-1

5-1
5-2
5-3
5-3
5-4
5-4
5-5
5-5
5-6
5-7
5-9
5-9

5-9
5-10
5-10
5-11

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

vi

Table

of

Contents

-

-

COURIER HIGH SPEED MODEMS

-

-

-

-

-

-

-

~

-

-

Transmitter
Break
S-Registers

Chapter

Before

Modula
Setting
Data
Error

Placing Calls

Dial (D) 6-3
Cancel Dialing
Dialing Type,
Adaptive
Pause(,)
Slash(/)
Wait
Dial
Dialing Letters(")
Transferring
Wait
Reversing
Dialing a

Redialing

Dial
Re-execute
Automated

Continuous
Continuous
Exiting

Escape

Modem
Returning
Hanging
Automatic

Suppressing

Points to
International

Handshaking

Guard

Pulse

Enable/Disable

Handling

6-Asynchronous

Connecting

Format

Control

for

and

for

the

Code

Up

Dial

( & Y n)

ti

on I Standards

the

Transmission

Pulse

Dialing (X2-X7)

Another

Return

an

Originate/

Stored

Last Dialed

Repeat

Operations

Response

Online ( 0)

(Hn)

Answering

Remember

Calls

Tone (&Gn) 6-13

Make/Break

Dial Tone (W) 6-5

to

Calls (!)

Answer(@)

Number

the

Last

Redialing(>,

Repeat
Re-Execute (A>)

Mode

to

Auto

Answer

Options

(Cn)

Dialing

Rate

or

Tone

Command

Answer

(DSn)

Number

Command

A>)

(>)

(

+++)

+++

(Bn)

Ratio

and

Answering

Mode

(;)

Frequencies

(DL) 6-8

(A/)

(&Pn)

(R)

5-11
5-11
5-12

6-1
6-1
6-2
6-2
6-2
6-3

6-3
6-4
6-4

6-4

6-5

6-5
6-5
6-6
6-6
6-7
6-7
6-7

6-8
6-8
6-9
6-9
6-9

6-9
6-10
6-11
6-11
6-11
6-12
6-12
6-12
6-12

6-13

-

Table

of

Contents

vii

COURIER HIGH SPEED MODEMS

-

Chapter

Chapter

7-Synchronous

Overview

Data

Rate

Protocol

Requirements

What

You

The RS-232 Interface

The

Synchronous

Setting

Dialing

Answering

Hanging

User
S-Register
Phone

Last-Dialed

Help

the

Modem
Modulation/Link
Flow

Control
Transmit
Synchronous

Out

Up

8-Queries

Inquiries (In)

Query

Number

Screens

Stop

/Restart
Cancel
Basic
Extended
Dialing (D$)
S-Register Functions

Display

Command

Operations

Synchronization

Compatibility

Need

to

Know

Adapter

Rate

Guidelines

Guidelines

Clock Source (Xn)

Mode

(&Ml)

and

Help

(Sr?)

Query

Number

Command

Inquiry

Display

Set

(&Zn?)

($)

Set(&$)

(S$)

Card

Screens

(DL?)

7-1
7-1
7-1
7-1
7-2
7-2
7-2
7-3
7-3

7-4
7-4
7-5
7-5
7-6
7-6

8-1
8-6
8-6
8-6
8-6
8-6
8-7
8-7
8-7
8-8
8-9

-

-

-

-

-

-

-

-

-

-

viii

Appendix

Table

A-Link

and

Error

Link

Negotiation

HST

Mode

V.32

bis

Dual

Standard

Control

Error
CCITT V.42
MNP

Handshaking

Compression

Data

Control

Flow

of

Contents

PART

Negotiation

Control

(Handshaking)

Mode

Handshaking

and

Throughput

Handshaking

II.

REFERENCE

(Handshaking)

A-1
A-1
A-3
A-5
A-5
A-6
A-6
A-6
A-7

-

-

-

-

-

-

COURIER HIGH SPEED MODEMS

-

-

-

.....

-

Throughput

Achievable

Appendix

The RS-232 Interface
Front Panel Indicators
DIP Switch
Default Settings

S-Register

ASCII

Appendix

Requirements
Basic

Command
Ampersand
Percent

Remote Access
Appendix
Appendix

Fax

Operations
Voice/Data
Remote
High

Speed I Low
Dedicated Line
Hewlett

Ml/MIC

Appendix

Testing

Ending a Test-&TO,
Analog
&T2
Digital
&T4,
Remote Digital

Testing

Analog
Dial

Test

Remote Digital

Appendix

Appendix

Index

Guidelines

Throughput

B-Summaries

Summary

Summary

Chart

C-Alphabetical

Command

Command

D-Problems
E-Fax

Configuration

Packard

Operations

F-Modem

with

&T

Loopback-&Tl,

Loopback-&T3

&TS

with

Register S16

Loopback-S16=1D
Test-S16=2
Pattern-S16=4

G-Glossary
H-Technical

and

Tables

Command

Set

Set

Set

Commands

and

Solutions

and

Other

Operations

Speed

Protocol

and

Leased Line

3000 Installations

Testing

S18

&TS

Loopback-&T6,

Loopback-S16=8

Specifications

Summary

Operation

&T7

A-7
A-9

B-2
B-4
B-6

B-9
B-12
B-21

C-1
C-1

C-6
C-11
C-11

D-1

E-2
E-3

E-7
E-13
E-16
E-19
E-20

F-1

F-1

F-2

F-4

F-4

F-5

F-5

F-8

F-8

F-9
F-9

F-10

G-1

H-1

-

Table

of

Contents

ix

COURIER HIGH SPEED MODEMS

-

LIMITED WARRANTY

U.S. Robotics, Inc.,
end

user

purchaser
materials
date
of purchase,
same
parts
modified,
working

REP AIR
WARRANTY
CHASER. THIS WARRANTY
WARRANTIES, EXPRESS OR IMPLIED, INCLUDING ANY
IMPLIED WARRANTY OF MERCHANT ABILITY OR FITNESS
FOR
SHALL
INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND
OR CHARACTER.

Some states

or

consequential
implied
not
and
state.

To obtain service
Technical
8100
will
to

help
received
prepaid,
the
it securely,
the package,

or

of purchase.

or

similar model)

or

labor. This

tampered

conditions.

OR

AP

ARTICULAR USE OR PURPOSE,

IN

warranty

apply

to you. This

you

may

Support

North

be

given a

us

keep track of
your
to U.S. Robotics at the above address. Include

date

of purchase. IMPORTANT:

warrants

that

workmanship

During

the

product

warranty

with, misused,

REPLACEMENT AS PROVIDED UNDER THIS

IS

THE EXCLUSIVE REMEDY OF THE PUR-

NO

EVENT

do

not

allow

damages

lasts, so the above limitations

also

have

under

Department

McCormick Blvd., Skokie, Illinois, 60076-2920. You

Return

RMA

number,

be

sure

your

and

ship

to

the

original

this

product

for a

period

the

warranty

will be

at

BE

the

warranty

other

this

Materials Authorization (RMA)

your

RMA

it charges

repaired

our

option,

shall

not

or

IS

IN

LIABLE TO PURCHASER FOR

exclusion

or

allow limitations

gives

rights

which

warranty,

at 800/982-5151

warranty
take

or

number

prepaid

consumer

is free from defects

of

two

years from

period,

without

apply

subjected to

LIEU

or

you

contact

request. Once

mail the

If

you

is visible

and

upon

or

replaced (with

charge for either

if the

product

abnormal

OF

ALL OTHER

AND

U.S. ROBOTICS

limitation of incidental

on

how

or

exclusion
specific legal rights,
vary

from state to

the

U.S. Robotics

or

by

product,

ship

your

on

the

and

insured.

or

other

in

the

proof

the

long

mail

at

number

you

have

postage

proof

unit,

outside

is

an

may

pack

of

of

-

-

-

-

-

-

-

-

-

-

-

-

-

Should

the instructions
Appendix
procedures

x Warranty

you

encounter

contains solutions to

to follow if there is

in

Appendix

problems

in

operating

Din

Part

operating

an

apparent

this device, follow

II

of this manual. The

problems

modem

as well as
malfunction.

-

-

-

-

-

COURIER HIGH SPEED MODEMS

FCC REGISTRATION

FCC68: CJEUSA-73130-FA-E
RINGER EQUIVALENCE: 0.4B
FCC15: CJE-0151-147

DOC (CANADA)

-

This digital
radio
interference
Communications.

Le

present
electriques
numeriques
brouillage
Communications

CONNECTING

It

is
installing
request
connected

If

the
ask
Inc., 800/982-5151.

If

the
In this case, disconnect
difficulty is traced.
telephone

apparatus

noise emissions

regulations

appareil

depassant

de

la classe B prescrites

radioelectrique

TO

THE TELEPHONE COMPANY

not

necessary to notify

the

modem.

the

telephone

and

the

telephone

them

to call

modem

is

lines.

does

not

from

digital

of

the

numerique

les limites applicables

edicte

du

Canada.

the

However,

number(s)

FCC

information

company
the

malfunctioning,

has

Technical

the

modem

Do

not

use

exceed

apparatus

Canadian

n'emet

dans

par

le

telephone

the

telephone

to

which

printed

any

questions

Support

it

may

until

the

modem

the

Class B limits for

set

out

Department

pas

de

bruits

aux

appareils

le

Reglement

ministere

company

the

Department,

affect

the

company

Courier

above.

or

raises

the

source

on

party

des

telephone

in

the

radio

of

radio-

sur

le

before

may

is

problems,

USRobotics,

lines.

of

the

or

coin

-

-

Regulatory Information

xi

COURIER HIGH SPEED MODEMS

-

RADIO

AND

TELEVISION INTERFERENCE

This

equipment

if

not

installed
manufacturer's
television reception.
tested

and
computing
15

of

FCC rules,

protection
However,

in a particular
to

radio

or
monitoring
correct

If

radio
find
Communications

the

Reorient
Relocate

receiver.

Relocate

that

necessary,

I television technician for

the

following booklet,

generates

and

used

instructions,

Courier

found

to

comply

device

against

there

television reception,

problem

they

in

which

such

is

no

installation.

reception

the

receiving

the

computer

the

computer

are

on

consult

Commission,

accordance

guarantee

with

separate

your

and

properly,

may

high

with

are

designed

interference

If

this device

when

the

one

or

antenna.

with

and/

branch

dealer

prepared

uses

radio

frequency

in

strict accordance

cause

interference to

speed

modems

the

limits for a Class B

with

the

specifications

to

provide

in

a residential installation.

that

interference will

does

which

you

modem

more

respect to

or

or

additional

helpful:

is

on

of

the

the

receiver

circuits.

an

experienced

suggestions. You

by

the

reasonable

cause

can

determine

and

following

the

so

Federal

energy

with

radio

have

been

in

not

occur

interference

off,

try

to

measures.

and
the

Part

by

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and

-

-

-

-

-

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may

-

How

to

Identify

Problems
Stock No. 004-000-0345-4
U.S.

Government

Washington,

In

accordance

or

tampering

others

may

xii Regulatory Information

with

be

with

reason

and

Resolve Radio-TV Interference

Printing

DC 20402

Part

15

this device

for

prohibiting

of

the

Office

FCC rules,

that

causes

harmful

future

any

modification

interference to

operation.

-

-

to

-

-

-

-

-

-

COURIER HIGH SPEED MODEMS

-

-

-

-

FOR CANADIAN MODEM USERS

The

Canadian
identifies certified
equipment
protective,
department
user's

satisfaction.

Before installing this

connect it to
company.
acceptable

extend
service
extension

compliance

degradation

Repairs to certified
Canadian
repairs
equipment
company

For

connections of
metallic
This

the

by

or

your

precaution

Department

meets

certain

operational,

does

not

the

facilities of

You

must
method
company's

means

cord). You

maintenance
alterations

cause

own

water

of a certified

with

the

of service

malfunctions,

to

protection,

the

pipe

may

equipment.

guarantee

equipment,

also install

of

connection.

inside

should

above

equipment

made

request

power

system, if

be

of

Communications

This certification

telecommunications

and

safety

requirements.

the

equipment

make

sure

the

local

telecommunications

the

equipment

In

some

wiring

be

conditions

in

some

facility

by a user

may

the

make
utility,

particularly

for single line

connector

aware,

situations.

should

designated

give

user

present,

be

to this

the

to

disconnect

sure

that

telephone

important

however,

may

telecommunications

are

(DOC) label

means

network

will

you

are

using

cases,

assembly

not

prevent

made

by

by

the

equipment,

the

the

electrical

lines,

connected

in

that

The

operate

permitted

an

you

may

individual

(telephone

that

an

authorized

supplier.

or

equipment.

ground

and

internal

together.

rural

areas.

the

to a

to

also

Any

-

-

-

-

CAUTION:
contact

electrician.

The
denotes

telephone
termination
subject
Numbers

the

Courier

Load

only

Number

the

of

Do

not

appropriate

High

(LN)

percentage

loop

used

on a loop

to

the

requirement

all

the

devices

attempt

electric

Speed

assigned

of

the

by

the

may

to

make

inspection

Modems

total

device,

consist

that

not

exceed 100.

such

connections yourself;

authority

Load

Number:

to

each

terminal

load

to

be

connected

without

of

the

Regulatory Information xiii

overloading.

any

combination

total

of

the

or

5

device

of

Load

to

The

devices,

the

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

COURIER HIGH SPEED MODEMS

-

-

-

-

-

-

INTRODUCTION

Congratulations! The
sents
tional reliability,
rates
connect
rate

between

equipment
The following features

reliability

High Speed

All

Courier
dard-connect
maximum
high-speed
Adaptive

most

Like
next

lower
conditions
the

lower
improved
higher

at

the

integrity.

CHAPTER

powerful,

up

to 14,400 bits

with

Calls-Adaptive

speed. ASL

highest

advanced

each
the

and

software

and

performance.

high

speed

at

rate

on

modems

Speed

Leveling.

high

speed

speed,

warrant.

rate

for

line

conditions

possible

compatibility

other

computer

9600, 12K

HST-to-HST connections.

for

the

1.

FEATURES AND COMPATIBILITY

Courier

per

and

Speed Leveling (ASL)

modems-HST,

monitor

modems,

example,

Unlike

rest

keeps

speed,

modem

electronic

and

second

at

up

to 16,800 bps.

and

support,

capabilities

and

phone

other

of

the

and

shift

the

modems

and

flexibility

(bps).

modem,

can

14.4K

Courier

12K,

modems,

call,

upward

constantly

you've

design

Courier

depending

be

as

assure

V.32

bps,

line

quality

modems

then

9600,

Courier

online,

purchased

that

offers excep-

at

all

HST

The

transmission

high

as

you

bis

and

with

16.SK

In

addition,

and

fall

if

poor

however,

modems

again

to

always

ensuring

repre-

standard

modems

on

your

57,600 bps.

of

superior

Dual

Stan-

the

our

perform

back

to

line

that

stay

detect

the

next

operating

data

the

at

-

-

-

-

Fax

Capability-Courier

If

you've

ities,

you

sending

Error

Control-V.42/MNP

Data
modems
control protocols.
and

or

integrity

above.

Fax Modems

chosen

can

that

to

purchase a Courier

use

your

receiving faxes.

is

ensured

use

the

V.42 (LAPM), USR-HST,

Error

modem

modem

control is available

when

in

Class 1 facsimile

the

modems

Features and Compatibility

with

connect

or

MNP

on

calls

fax capabil-

mode

for

with

remote

error

at

1200

bps

1-1

COURIER HIGH SPEED MODEMS

-

Data

Compression-V.42

Data

compression

SOK

bps

on

14.4K

under

V.42

or
Couriers
compression. Achievable
files is listed

Flow ControlNariable Interface Rates

Flow
computer
enabling
and
puter
the

Voice/Data Switch

Users
with
modems. A new
allows
issuing a command.

If

you
can
a

command,
command
voice/

connecting

control,

interface

greater

software

to

the

link

rate.

have

another

you

don't

assign

data

in

required

support

modem

always

user

to

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string. See

switching.

bis/MNP5

enables

or

16.8K

HST

error

under

Appendix

rate

efficiency

at

been

before

feature, a

change

switch

as

resetting

potential
bps

control

MNP

throughput

A.

under

error

to

be

set

and

high

rates,

57.6K, 38.4K

able to

turning

switch

from

voice to

use

voice

a different function

the

Appendix

throughput

connections.

use

V.42

error

control, also allows

higher

throughput.

data

or

phone

control

on

the

data

and

data

modem

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Voice/Data, for

bis

control

of text

than

can

be

19.2K

and

make

of

modem's

and

in

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or

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bps,

the

the

of

well

over

connecting

compression.

use

MNP

Level 5

and

other

types

the

the

link

rate,

If

your

equipment

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from

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regardless

arrangements

call

over

to

front

panel,

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call,

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requires

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instructions

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Asynchronous/Synchronous Capability

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asynchronously. A personal
nous
synchronous

1-2 Features and Compatibility

that

high

interface

is executable

speed

modems

adapter

protocols. See

string

at a touch

can

call

in

nonvolatile

operate
computer

computers

Chapter

random

of

the

voice/

data

synchronously

equipped

that

7 for

more

with a synchro-

use

information.

access

switch.

as

well

standard

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as

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COURIER HIGH SPEED MODEMS

-

-

-

-

-

Programmable Nonvolatile Memory

You

can

tailor

your

own

default
volatile
Courier

specified.

Link Rate Negotiation

The

rate
allowing

Link Diagnostics

After

taining
data

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Modem Diagnostics

New
options,
available. The
digital,

Inactivity Timer

random

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powered

Courier

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CCITT V.54

automatically

connections

call,

information

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call

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access

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loopback

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the

line statistics,

testing

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Originate

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last call,

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Appendix

at

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link

range

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modems.

screen

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number

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of

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You

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Call Duration Reporting

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modem

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seconds. This feature enables

audit

of

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optional

when

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the

phone,

Modem Settings Displays

On

command,

way

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ational controls.

of

minutes

records

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calling activities. You

clock

as

a real-time clock.

set

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busy, a person

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Features and Compatibility 1-3

hang

up

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calls

in

hours,

display

optionally

phone

settings, a

and

the

defaults

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minutes,

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stored

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COURIER HIGH SPEED MODEMS

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nonvolatile
in

read-only

HELP Screens

The

modem

Dial

command

Bottom Panel Reference

Command
bottom
guide
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software requirements. -

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The

modem
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modem
to

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You can

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COMPATIBILITY

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the

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lines

Mode

numeric

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information

Dual

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switch

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if

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command

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The

Courier
patibility
wise indicated, HST, V.32
conform to the listed

USR-HST 16.SK,

CCITT V.32

CCITT V.32

CCITT V.22

1-4

Features and Compatibility

adheres

with a wide

Standard

bis

14.4K/12K/9600/7200/4800
Standard

9600/
modems)

bis

2400

to the following

base

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installed

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and

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bps

bps

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modems)

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modems)

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modems

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bps

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COURIER HIGH SPEED MODEMS

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Bell 212A
CCITTV.23

CCITTV.25

Bell 103
CCITT V.42
CCITT V.42
MNP

CCITT V.54 Analog, digital

Fax

Modems

TIA/EIA-578 Service Class 1

CCITT V
CCITT V.27
CCITT

Other
certification:

.29

V.21

compatibility features

1200

bps

(also CCITT V.22)

1200

bps

with

phone
Answer

the U.S.
300
LAPM

bis

Data compression, 1200
Levels 2, 3

compression, 1200

testing

Control
9600 I 7200

ter

4800/2400
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system)

bps

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bps

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and 4 error

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bps

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for calls

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optional)

control, 1200

control, level 5

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Asynchronous

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digital

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loopback

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interface

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or

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interface.

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COURIER HIGH SPEED MODEMS

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Figure

PACKAGE COMPONENTS

Your

Courier

addition

• The

• A quick-configuration listing of

•

• A

• A Quick-Reference card,

• Your

2.1-Courier

modem

to this

modem

Standard,

other

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communications
startup.

An

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power

warranty

Robotics, Inc.

package

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you

Courier

recommended

phone

adapter.

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High

contains

purchased:

HST

software

cord.

card, to

be

Speed

Courier

or

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for a

products,

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filled

2.

SET-UP AND TESTING

Modems

the

following

HST

V.32

Courier

number

plus

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out

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switch

of

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OPERATIONAL REQUIREMENTS

The

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radio
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Set-up and Testing 2-1

Be

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COURIER HIGH SPEED MODEMS

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cated

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the

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terminal

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to

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COURIER HIGH SPEED MODEMS

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SWITCHES

Voice/Data

nector,
requires a DB-95 connector.
DB-9P or,
your

NOTE:
required
you're
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check
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WARNING:
to-modem
concerning the RS-232 cable
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speeds.

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voice
instructions

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and

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of

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to

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communications

in

Appendix

on

the

an

modem.

type

of

documentation

RS-232 connector is required.

planning

or

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PC/

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Apple

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or

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a listing of RS-232

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cable

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need,

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or

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use

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38.4K

bps,

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in

Appendix

signal

degradation

used

primarily

during

E,

Voice/Data

Options

are

and

some

compatibles

require

plug

connector.

computer

pin

assignments

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consult

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to

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Calls.

as follows:

the

or

if

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or
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speed

instructions

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guidelines

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Disable

Force the
Force the
Have
Have

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Reset
Initiate Remote Digital Loopback testing
Busy

Volume Control

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modem,
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panel

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speaker; sliding it

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in

of the

COURIER HIGH SPEED MODEMS

-

FRONT PANEL INDICATORS

Below is a list of

Appendix

HS
AA
CD

OH

RD

SD

TR

MR

RS

cs

SYN

ARQ/FAX

INSTALLING THE MODEM

1.

Turn

off

2.

Examine
to

the

icons to

back

of

the

B for

descriptions

High

Speed

Auto

Answer
Carrier
Off

Hook
Received
Send

Data

Data

Terminal
Modem
Request
Clear
Synchronous
Automatic
Fax

Mode

the

computer

the

label

summaries

aid

in

the

modem,

modem's

Detect

Data

Ready

to

Send

to

Send

Repeat

(Fax

on

and

modem

shown

twelve

of

their

Ready

(Power)

Request

modems

or

terminal

the

bottom

other

information,

assembly.

in

status

operations.

(Error Control) I

only)

and

of

the

Check

the

following

lights,

its

peripheral

modem.

the

label contains

the

interfaces

photograph.

or

LEDs. See

In

addition

devices.

at

the

-

-

-

-

-

-

-

-

-

Figure

2-4 Set-up and Testing

2.2-Interface

End,

Courier

-

-

-

-

-

Modem

-

-

-

COURIER HIGH SPEED MODEMS

-

-

-

-

-

-

-

3.

4.

Now

review

Check
towards
the

power

jack

at

dard

115-volt

Figure

to

make

the

the

back

the

attached

2.3-Connected

sure

zero

in

the

supply

of

AC

adapter's

the

wall

that

the

0/1

modem.

socket.

interfaces

Courier

power

icon

on

small

connector

Plug

in

Figure

Modem

switch

the

bottom

the

adapter

2.3.

is OFF;

label.

into

press

the

into

it

Plug

power

a stan-

-

-

-

Disconnect
Plug
into

the

on

the

NOTE:

appropriate
RJl 1 C connectors
pany

If

you

tional calls,
modem

one

end

modem's

bottom

Older

or

computer

want

near

your

of

label.

telephone

modular

to

keep

plug

the

present

the

phone

phone

Plug

are

dealer.

your

its

cord

phone

phone

cable

jack

that

the

installations
wall jack
available

telephone

into

the

icon. You

cable

from

the

wall

that

came

with

is

near

the

wall-jack icon

other

end

into

the

may

not

have

and

plug.

Adapters

from

your

telephone

connected

jack

at

can

also

Set-up and Testing 2-5

the

rear

use

for

both

jack.

the

modem

wall

the

and

conven-

of

the

your

jack.

com-

COURIER HIGH SPEED MODEMS

-

telephone
time.
control

5.

Next, check
Package (DIP) Switches located
the

modem.

positions

and

modem

Voice/Data,

of

the

most

in

Appendix

phone

the

These switches

1 2 3 4 5 6 7 8 9 10 QUAD

line

positions of

users

require.

~r:1~1~1~1~1~1~1~101~1~11

Figure

The quick-configuration
shows
communications
software is
for its
and
options

If

bottom

ence

recommended

requirements,

6.

You'll also find descriptions of

in

you

already

of

Card

2.4-DIP

software

not

listed, check

Appendix

know

the

modem

to verify

switch

particularly

B.

your

the

in

one

call,

E,

between

the

are

Switch

guide

settings for

products.

your

requirements,

or

the

summary

switch

positions.

although

explains

the

bank
in

the

set

at

not

how

phone

of

and

Dual

well

at

the

factory to the

at

the

to switch

the

In-Line

the

bottom

11.

Factory

that

software

for DIP switches 1, 4, 5

came

If

your

switch

in

Settings

with

the

manual

many

widely-used

communications

documentation

functions

use

the

guide

the

Quick

same

modem.

of

and

on

Refer-

-

-

-

-

-

-

-

-

the

-

NOTE:
not
ON,
to
modem
communications

DIP
Chapter
write
and

The
switches

reverses

Appendix

2-6 Set-up and Testing

If

support

for

the

operate

to accept

switch

their

have
wider

the

you

have

built

your

Data

Terminal

DTR override. The

as

if

the DTR signal is

commands.

software,

10 is

explained

5.

Most

users

will

own

defaults to nonvolatile

those defaults

Quad

switch

should

be

transmit

B,

DIP Switch Summary).

loaded

on

left OFF

and

receive

own

Ready

however,
under

want

the

(DTR), set DIP

override

always

Most

Setting/Using

to leave this

at

power

right

unless

you

pins

RS-232 cable

causes

ON,

and

purchased

requires DTR.

memory

on.

of

the

numbered

know

your equipment

at

the

RS-232

and

switch

the

modem

enables

Defaults

switch

OFF,

(NVRAM),

interface

it

does

1

the

in

(see

-

-

-

-

-

-

-

COURIER HIGH SPEED MODEMS

-

-

-

-

6.

The final
terminal's serial
in this chapter.
modem

NOTE: To
top

of the

The

modem

TESTING THE INSTALLATION

Use

the

working

1.

Turn
Then
front

CD

MR
CS Clear to
TR Data Terminal Ready, if

For
Appendix

2.

Set
addition,
or

8 bits

Stop bit.

step

and

prevent

modem

is

now

following

properly.

on

your

turn

the Courier's

panel

indicators,

Carrier
enabling

Modem

enabling

more

information

B.

your

terminal

set a

with

is to connect

to

the

case.

procedures

computer

Detect,

the

Ready

Send

the

word

no

port

with

the

Attach

overheating,

ready

the

serial port.

to

or

power

or

if

you

CD

override

/Power

DTR

override

on

or

software

length

parity-it

be

to verify

LEDs, will

the front

the

modem

RS-232 cable described earlier

appropriate

do

not

tested

terminal

switch

have

ON

you

to 19.2K

of either 7

doesn't

cover the

and

that

and

light

set

DIP

have

panel

matter

to

the

computer's

connectors

vents

operated.

your

modem

clear the screen.

ON.

The following

up.

switch 6 ON,

set DIP

bps

bits

switch 1 ON,

indicators, see

or

9600 bps.

plus 1 parity

which

now-and

to

on

or

the

the

is

In
bit,

1

-

-

3.

If

you're
tions software.
that

lets

the

computer

programs

require
type a Function

If

necessary, refer

mentation

using a personal

If

your

you

send

AT

in Terminal

do

this automatically

you

to

display a communications

key,

or

to

your

for instructions.

computer,

software

commands

Mode.

perform

allows,

to

Some

upon

some

communications

load

your

communica-

perform

the

modem,

communications

loading.

or

other

Set-up and Testing 2-7

the

that

Others

terminal

operation.

software

function

is,

puts

screen,

docu-

COURIER HIGH SPEED MODEMS

-

4.

Check
communicating

attention

not a combination,
Return) key,
brackets. (Don't

If

everything

NOTE:

causing
commands.
local echo is OFF. To
modem

If

double

and

software
ware
the

following

Troubleshooting

to see if

AT

OK

the

ATE1 <Enter>

to local echo OFF,

ATEO <Enter>

your

with

command.

shown

type

<Enter>

is correct,

The

modem

the

modem

If

your

following

characters

are

command.

computer

each

Type

and

in

the

is

to

entered

turn

command.

appear

set

to local echo

other

either

then

press

the

example

angle

the

modem

shipped

display

command

the

on

or

turn

or

terminal

by

sending

upper

the

below

brackets.)

responds

with

DIP

(echo)

your

local

echo

the

screen,

ON.

the

modem's

and

the

or

lower

Enter

(Carriage

between

as

switch

keyboard

is

not

displayed,

ON,

both

Either set

echo OFF

modem

following

case letters,

angle

follows:

4 OFF,

send

the

your

modem

your

are

your

soft-

with

-

-

-

-

-

-

-

-

-

If

no

OK

appears

checkpoints.
a.

Make

sure

<Enter>. -

b.

Check
the

c.

Make
mode,
review

2-8 Set-up and Testing

to see

correct serial

sure

so

Step

on

your

screen,

you

type

all

that

you

set

port.

your

software

that

you

can

send

4,

above. -

upper

your

has

the

review

put

the

following

or

lower

case letters

communications

the

computer

modem

commands.

and

software

in

Terminal

Then

press

to

-

-

-

-

-

COURIER HIGH SPEED MODEMS

-

-

'-

-

-

d. Be

e.

f.

g.

5.

sure
according
table

in

also

need

terminal

The

Quad

If

you

set
modem
modem,

DIP

switch

codes,

including

DIP

switch 3 ON,
is OFF, reset it to
switch

A final check
Type

On
waits

hear
operation,

setting

ATZ <Enter>

the

ATD <Enter>

receipt of

for a dial tone. The

the

that

DIP switches 1

to

your

terminal

Appendix

to

or

communications

switch

DIP

to

Smart

and

3 controls

following manual

dial

press

review

on

switch

mode:

power

the

enabling

the

with

of

the

the

command,

tone

from

any

B explains

the

the

8 OFF, for

it

on

the

OK

ON

the

modem

key.

and 6 are

or

software

each

quick-configuration

software

right

should

set DIP

again.

display

result. The

the

position.

following

is to see

Dial

the

OH

indicator

the

modem's

set

ON

requirements.

function,

documentation.

be

in

Dumb

result

command:

mode,

switch 8 ON,

of

the

modem's

modem

codes.

Then

initiate

reset

command.

that

it

modem

goes off

lights,

speaker. To cancel

or

OFF

and

you

guide

or

the

OFF position.

reset

the

power

result

is

shipped

If

DIP

switch

the

gets a dial

hook

and

you'll

The
may
your

off

new

tone.

and

the

with

3

the

-

-

-

If

you

don't
sliding
modem.
cable
the

by
not

correctly.
<Enter>.

the

from

modem.

the

wall

the

phone

hear

volume

If

that

the

The

jack icon

Then

the

doesn't

wall

correct

icon.

try

dial

tone, first increase

control

jack is

the

switch

work,

connected

connection

on

the

If

necessary, reconnect

manual

towards

check to see

bottom

label

Dial

the

volume

the

front

that

the

to

the

correct jack

is to

the

jack

of

the

modem

the

phone

command

Set-up and Testing 2-9

again,

by

of

the

phone

on

identified

case,

cable

ATD

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

COURIER HIGH SPEED MODEMS

-

-

-

-

-

-

CHAPTER

ASYNCHRONOUS/SYNCHRONOUS COMMUN/CATIONS

Courier
asynchronous
usually
typical
cate

Most
around
communications,
data
port,

Synchronous
between
usually
exchange
specialized
synchronous
you
modem

INITIAL MODEM SETTINGS

3.

QUICK START-ASYNCHRONOUS OPERATIONS

high

speed

and

capable

personal

only

of

the

asynchronous

character before

and

two

required

will

be

easy

of

one

computer,

asynchronously.

operational

the

expects received

data

transfer

communicating

by

data

synchronously, a personal

equipment,

communications

making

to use.

desktop

synchronous

computer

sending

mainframes

synchronous

Just

and

type

of

communications

however,

information

communications.

it

data

is

based

devices,

including

card

follow

rack

modems

communications.

is

equipped

in

this

adds

Start

to

the

modem

to

be

in

the

on

synchronized

not

and

other

the

installation

with a synchronous

connections, you'll

the

instructions

are

manual

During

and

Stop
over

same

on

data

large

computer

capable
Terminals

or

the

to

is

asynchronous

bits

the

format.

format,

computers.

requires

of

a

in

Chapter

of

other.

communi-

organized

to

each

serial

timing

and

port.

find

the

are

The

is

To

If

7.

-

-

-

-

This

manual

Courier

modems

The
type

of

•

• V.32

• HST

The

above

speeds
factory defaults,
modem
it to

BO.

covers

HST

Dual

are

modem.

Dual

Standard

high

speeds

bis

V.32

bis

modems-Bl-to

modems

settings

of 2400

is to

answer

the

operation

Standard,

factory-set for

modems-BO-so

with

both

modems-BO-to
and

V.32

modems

do

not

affect

bps

and

below. Leave

BO

or

Bl.

The exception is

overseas

of

three

Courier

calls,

V.32

compatibility

V.32 bis

connect

connect

how

the

the

in

which

Courier

bis,

that

and

HST

at

at

high

modems

modems

when

models,

and

Courier

with

their

own

they

connect

modems

high

speeds

speeds

case

with

connect

set

to

their

an

HST

you

should

Quick Start 3-1

the
HST.

at

with

HST

at

set

COURIER HIGH SPEED MODEMS

-

The

modem

Data

flow

calls

under

to

the

modem

phone

How
machine
flow control

Recommended Settings

The following
reliability
that

program
between
and

program
characters),

If

documentation
recommended
not,

link.

you

or

and

came

with

is listed

the

hardware

only

necessary,

use

the

set

is

shipped

control. This

error

faster

your

software

they

recommended
throughput.

the

and

computer

flow control (setting

supports

use

the Alternative Settings after this section.

review

as well

settings.

Alternative Settings after this section.

ready

type

control,

allow. Use

modem

than

modem

support

whether

and

software

your

computer

to

see if

If

and

the

to see

modem

either

for

use

except for Transmit

of flow control is
when

the

computer

modem

depends

flow control,
the

settings will yield

Check the quick-configuration

it

your

can

send

on

whether

and

guidelines

if

your

supports both

(setting the

the

flow control (XON

/terminal

system

your

software

that

communications

modem

and

supports

required

sends

it

over

or

not

what

follow.

the

best

a fixed
modem
to

&Hl).

/XOFF

software

or

machine

for

data

the

your

type

data

data

to &Bl)

If

the

of

guide

rate

a

do

-

-

-

-

-

-

-

-

-

1.

Set
software
This sets a

transmission

2.

Set
computer
the

the

3.

Set the software for
called RTS/CTS.

control
efficient

4.

Set
flow control (&H1).
in

3-2 Quick Start

your

software to

support:

high

between

the

software to a fixed serial

and

rate

on

the

serial

port.

the

data

and

reliable form of flow control.

the

modem

Terminal

mode,

the

19.2K, 38.4K,

serial

modem

phone

hardware

The

flow from

to a fixed serial

Have

as

highest

port

rate,

the

computer

maintain

line. Some

flow control. This

modem

shown

uses

the

computer.

your

in Step 3

rate

your

or

57.6K bits

that

is, the

and

port

rate

the

high

programs

Clear to

port

rate

software

equipment

rate

the

so

rate,

call this

Send

This is the

(&Bl)

put

of

Chapter

per

second.

of

data

modem.
that

the

regardless

locking

may

(CTS) to

and

hardware

the

computer

2, Testing

and

be

most

-

-

of

-

-

-

-

-

-

the

Installation,

indicates

and

pressing

COURIER HIGH SPEED MODEMS

type

the

the

Enter

following

key.)

command.

(<Enter>

-

-

To

have
type
the
write

Alternative Settings

Use

the

1.

Your
control,

&H2

&Bl

2.

Your
flow control,
protocol:

&HO

AT &81

the

&Wat

Enter

the

above

machine

but

machine

&H1

modem

the

end

key.

The

settings to

command

or

software

your

software

The

modem

(XOFF

/XON)

data. But see
As

in

Step 2

software

Flow control
software
control characters will
control characters,

supports

or

your

and

you're

flow control (&H2)

<Enter>

always

of

&W

nonvolatile

format

use

these

the

command

command

memory.

to

set

doesn't
supports

sends

the

computer

characters to control

Guideline

under

software

using

disabled

#2 below.

Recommended

a fixed serial

does

an

Xmodem-type

(factory setting).

be

and

you

settings as defaults,

string, before

causes

the
support

the

modem

modem.

hardware

XON

/XOFF

Ctrl-S

the

Settings, if

port

rate.

not

support

because

misinterpreted

risk losing

the

data.

signaling:

and

flow

file

you

press

to

flow

Ctrl-Q

of

your

hardware

transfer

Do

not

use

protocol

as flow

-

-

-

&BO

3.

Your
XON
following

&HO
&BO

&MO

The serial
tion
flow control.

system

/XOFF

configuration
Flow control
The serial

connection
there

Error
there

port

rate

rate

of

each

call.

doesn't

signaling.

support

In

not

disabled

port

rate

rate

of

is

no

flow control.

control disabled;

is

no

flow control.

switches to

Required

either

Clear

this case,

be

switches to

each

we

used

(factory setting).

call.

recommended

match

because

to

recommend

for calls

match

Required

the

connec-

there

is

no

Send

or

that

the

above

2400 bps.

the

because

because

Quick Start 3-3

COURIER HIGH SPEED MODEMS

4.

Your

software

does

not

support

a fixed rate:

-

-

&BO

5.

Your
S34=3 This disables

&Hl

&Bl Fixed serial

&M4

6.

You
S27=16 Disable

Factory setting. The serial
match
not

affect
not,
sible
link
compression,
sion

maximum

The

maximum
(Does

Hardware
flow control.

HST
Error

are

calling a

may
prevent
apply
enabled.

port

the

connection

error

however,

with

rate.

when

computer

modem

not

modems.

control factory

misinterpret

for

gain

a serial

In

addition,

&Kl,

the

link

higher-speed

operates

serial

apply

flow control (CTS),

port

non-MNP

MNP

handshaking. A non-MNP

a successful connection. This

remote

control

the

port

the

rate

rate

port

to HST

rate

of

setting

modem:

the

MNP

V.42

rate

of

or

flow control. You will

throughput

rate

fixed

at

the

modem

is set to

is 9600 bps:

V.32

as

a V.32

and

link

modems.)

9600

link

modems

rate

switches to

each

call. This

efficiency

higher

factory

bps,

required,

setting

disables

&BO.

bis

modulation.

modem,

rate

of 9600 bps.

or

&H2 for

recommended

request

with

than

compres-

with

or

&MS.

and

does

error

does

pos-

the

for

data

a

software

for

modem

not

control

-

-

-

-

-

-

-

-

-

7.

You
&K3

DATA FORMAT

The

Courier
data
The following table lists
Stop bits.

3-4 Quick Start

are

format.

transferring

This disables
work

successfully
compressed.
you

will

gain

and

the

remote

One

Start

bit

compressed

MNP

compression,

with

If

V.42

bis

optimal

modem

is

universal

the

allowable

files:

files

that

compression

throughput.

must

use

and

not

word

lengths,

which

does

not

are

already

is

negotiated,

the

same

ten-bit

programmable.

parity

and

-

-

-

-

-

-

-

COURIER HIGH SPEED MODEMS

-

-

-

Word

Length

7 Even,

7
8

STORING DEFAULTS IN NONVOLATILE MEMORY

Write

your

DIALING

(NVRAM)
the

modem
defaults.
modem

Be
key.

Use
pulse

maximum

sure

the

dialing:

is

to

following

default

with

for

The

powered
insert

AT

number

configuration

the

the

current

defaults

&W

&81

command

the T in

Mark,

&W

command.

are

on

if DIP

last

in

&H1

&W <Enter>

the

of

characters

Parity

(1

Bit)

Odd

Space
None
None

to

session

loaded

command

from

switch

the

string,

format. The

in a command

nonvolatile

The

following

and

also

NVRAM

10 is OFF.

before

enforces

Stop

Bits

1

2

1

stores

pressing

modem

tone

string

memory

example

the

settings

when

the

defaults

dialing.

is 40.

sets

as

the

Enter

to

The

-

-

To

redial

number

LINK

RATE NEGOTIATION

During
highest
The

Courier
remote
HST only), 14.4K, 12K, 9600, 7200, 4800, 2400, 1200
without
handshaking,

ATDT

the

number,

buffer,

ATDL

link

negotiation

possible

automatically

modem,

error

control, 300
see

phonenumber

which

use

the

following

<Enter>

(handshaking),

rate,

depending

switches

within

the

bps.

Appendix

<Enter>

the

modem

command:

on

following

For

more

A.

stores

in a last-dialed

the modems negotiate the

each

modem's

rates

to

match

rate

ranges: 16.SK (HST-to-

detailed

capabilities.

the

bps

information

Quick Start 3-5

rate

and,

of

the

on

COURIER HIGH SPEED MODEMS

-

ONLINE FALLBACK

When

online

Speed

Leveling.

they

sense

back

and

fallback range: 14.4K, 12K, 9600, 7200, 4800 bps.

If

conditions

to

the

next

forward

to

at

high

They

disturbances

retrain

(resynchronize)

remain

lower

speed.

the

next

speeds,

monitor

that

poor,

As line

higher

the

modems

the

threaten

at

Courier

improvements

speed,

condition

data

the

next

modems

up

to

the

perform

of

the

integrity,

lower

continue

occur,

link

rate

Adaptive

phone

they

fall

speed

in

to fall

they

of

the

line.

their

back

fall

call.

If

-

-

-

-

-

-

-

-

-

3-6 Quick Start

-

-

-

-

-

-

-

COURIER HIGH SPEED MODEMS

-

Use

the

settings
These
chronous

TERMINOLOGY

ARQ

used
codes.

The

terminal

nal

Equipment).
Courier
Courier
Equipment).

Figure
at

the

(modem-to-modem)

CHAPTER 4. INTERFACE

ASYNCHRONOUS OPERATIONS

commands

at

the

settings

calls, see

(automatic
by

USRobotics

An

ARQ connection indicates a call

modem
modem

4.1

indicates

DTE/DCE

explained
terminal
apply

or

computer

only

Chapter

repeat

in

The

DTE

or

computer

to

asynchronous

7.

request,

error

control

is

referred

rate
communicate,
is

referred

which

to

as

commands

(computer-to-modem)

in this

interfaces.

Local

DTE

Interface

Interface

chapter

and

phone

or

retransmission) is

commands

to

as

the

is

the

rate

at

for

example,

the

DCE

(Data

control

and

Link

CONTROLS-

to select

link

interfaces.

modem

operations. For syn-

the

term

and

response

under

error

control.

DTE (Data Termi-

which

your

DTE

and

19.2K

bps.

The

Communications

modem

phone

Interface

operations

link

Remote

DTE

-

-

DTE

DTE Interface

Detailed
familiar

command

with

Quick-Start

RS-232

Flow Control

Transmit Data: &Hn

Received Data:
DTE rate: &Bn
CD
DTR operations: &Dn
DSR operations: &Sn

Figure

DCE

&Rn,

operations: &Cn

4.1-lnterface

descriptions

modem

instructions

operations,

in

Phone

Link

&In

are

you

Chapter

RS-232

r-----i

DCE

Link

Interface

V.32/HST mode: Bn

Error Control (ARO): &Mn
Data Compression: &Kn
Link rate: &Nn

Control

Commands

in

this chapter.

may

want

to

3 instead.

Interface Controls 4-1

DTE

If

you're

review

the

COURIER HIGH SPEED MODEMS

-

CHANGING SETTINGS

When

you

change

one

of

the

following:

•

Change

• Issue
switch
in

nonvolatile
ON,
read-only

• Issue
tory

•

Turn
modem
defaults
switch

HIGH SPEED MODULATION: V.32 BIS/HST

At

high

speeds,

modulation
modems
calls
bps. (The
bps

that

at

16.8K (HST-to-HST only), 14.4K, 12K, 9600, 7200
modems

and

below.)

a setting,

the

the A TZ

10 is OFF,

the

modem

memory

the

AT &F

settings.

the

modem

then

(DIP

10 ON).

USRobotics

or

HST

have

the

setting.

command

the

memory

resets to

(ROM).

command

off,

loads

either

switch

modulation,

both

use

10

modems

capabilities. By

identical,

modem

modem

(NVRAM).

and

OFF)

unless

standard

retains it

to reset

the

power

the

the

resets to

If

factory settings

to reset

the

it

on

nonvolatile

or

the

use

either

they

high

modulation

until

you

do

modem.

the

DIP

modem

again. The

factory settings (DIP

are

speeds

defaults

switch

stored

memory

V.32 bis

Dual

Standard

we

If

DIP

stored

10 is

in

to its fac-

mean

or

4800

at

2400

-

-

-

-

-

-

-

-

-

Modulation

The

V.32 bis modulation-BO. V.32 bis

Dual
with

HST

ever,
Under

directions.
the
modems

4-2

Interface Controls

Settings-an

modems

Standard

both

modulation-Bl.

they

high

V .32

can

V.32 bis

Under

speed

switch

are

modems

bis

be

modulation,

in

set

at

modems

HST

set to

HST

one

direction

the fast

the

factory as follows:

modems

are

factory set to

and

HST

modems

BO

to

answer

data

flows

modulation,

and

450

and

slow

channels

are

always

BO

so

that

modems.

are

usually

international

at

data

bps

set

calls.

the

same

flow is asymmetrical:

in

the

other.

when

the

set to

they

to Bl.

rate

in

volume

BO.

connect

How-

both

The

of

-

-

-

--

-

-

-

data

flow changes. Interactive

V.32

modulation,

modulation.

while

COURIER HIGH SPEED MODEMS

applications

connection times

appear

are

faster

faster
under

under

HST

-

-

WARNING:

19.2K, 38.4K
9600

bps,

that

is V.32. Disable V.32

does

not
setting
defaults
chapter.

MODULATION

THROUGHPUT GUIDELINES

AT

The

Bn

except for
at

the

end

that

the
connect slightly faster.
and

other
modems.

The following
your

modem's
instances,
works

best

To connect

or

57.6K bps.

V.32

bis

modems

switch

Register S34 to 3 (S34=3)

you

2400 BPS ANO

setting

B1

its DTE

write

is

not

answering

of

Chapter

setting

settings

guidelines

advanced

experimentation

for

your

above

If

are

bis

rate

up

to

nonvolatile

BELOW

significant

calls

from

6.) The

(Bell

answer

Error

are

the

same

should

performance

and

applications.

9600

bps,

the

DTE

rate

must

the

local

computer

limited

modulation

only

tone)

control, DTE rates, flow control

for

experience will

to 9600

so

higher

and

at
overseas. (See International

than

including

memory,

speeds

difference

allows

both

HST

help

you

features.

as

of

to

bps
that
9600

that

shown

2400

you

the

and

make

indicate

is

limited

maximum,

the

modem

bps.

Do

setting

in

bps

and

might

modems

V.32

bis

the

most

In

many

to

this

in

the

next

lower

notice is

to

what

be

by

the

Calls

of

-

-

-

obtain

You'll

conditions.

1.

Your

communications
higher
to 57.6K, 38.4K
Check
modem

Commands

2.

The call is

(&Kn)

optimal

than

the

quick-configuration

or

under

in

this

throughput

the

link

or

19.2K

your

software

in

this chapter.

data

chapter.

rate, for

under

software

bps

compression.

supports

example,

and

guide

manual,

setting

the

following

a fixed DTE

setting

that

and

see

See

Interface Controls 4-3

the

came

Data

Data

modem

your

software

to

with

the

Rate

Compression

rate

&B1.

COURIER HIGH SPEED MODEMS

-

3.

You're
files
binary
Appendix

4.

File
Many
throughput
protocols, for

Kermit

Xmodem

Ymodem

The
control (ARQ) connections. The accuracy of
checked twice,
To
ARQ connections,

For
with
current
protocol,
with
and
pression.
error-controlled calls,
connection if it detects

transmitting

than

for

other

files. For a

A.

transfer

above

avoid

the

hardware

no

&Kl settings for

is

non-text files

result

Throughput
short
edgment

Throughput
short
versions
better,
information) still affects overall

This protocol is
block
control protocol information) still affects
throughput.

protocols

redundancy,

best

throughput,

version

with

file-transfer protocol. Leave

Ymodem-G is

text files.

types

of files,

comparative

not

slowed

vary.

example,

block

tum-around

block lengths, for

use

although

lengths

by

the

and

flow control,

of Zmodem.

throughput

down

require

further

a file

Certain

have

is severely

lengths

may

be

blocks of 1K bytes,

overhead

better

(1K bytes),

reduce

file

transfer

use

the

only

at

but

almost

both

error

another

because

an

error.

Throughput

such

table, see

by

transfer

public

the following effects:

reduced

(under

time. -

reduced

example

than

protocol

above

speeds

on

ARQ connections

we

recommend

Overhead

equal

control

good

Ymodem-G

is

higher

as .EXE

the

end

a file-transfer protocol.

protocol,

domain

due

128 bytes)

if

your

128 bytes.

which

(error control

throughput.

some

because

although

throughput

protocols

the

and

of 2400

is

minimal

to

that

modem

and

choice,

aborts

overhead

the

the

data

for text

or

.COM

of

but

file

transfer

to Kermit's

and

acknowl-

version

only

bps

obtained

but

is

much

protocol

of

overall

during

data

the

modem.

for

and

only

most

with

at

its &M4

com-

only

the

uses

Some

larger

(error

is

lower.

and

on

error

non-

this

-

-

-

-

-

-

-

-

-

-

-

-

WARNING:

protocol,
the

more

Data

Flow

Control

4-4 Interface Controls

If

do

not

detailed

Control

(&In).

you

are

use

the

warnings

(&Hn)

using

an

modem's

in

this

and

Received

X, Y or

software

chapter

Zmodem-type

flow control. See
under

Transmit

Data

Software

-

Flow

-

-

ERROR CONTROL (&Mn)

The

Courier
control
connection.

without

takes to

The

exception to the
do

not

and,

error

key

use

first
if

If

control. (The process takes

in

V.42
HST technique,
speed/low

Error
more
options

&MO

&Ml

speed

control is possible
detailed

are

available.

Normal
phone
above

This

is

line channels, this is

2400 bps.

setting

used

Synchronous Operations, for instructions.

attempts

that

doesn't

that

doesn't

this

paragraph.)

above

error

control.

an

MNP-type

asymmetrical

at

information,

mode,

no

error

is exclusive of

only

for

Synchronous

COURIER HIGH SPEED MODEMS

a connection

succeed, it
succeed, the

is

that

They

of

protocol

attempts

HST

use

using

V.42 (LAPM)

an

Courier

much

tries to
less

modems,

USRobotics'

adapted

MNP

time

at

high

proprietary

for its

connect

than

speeds,

high

modulation.

speeds

of 1200

see

Appendix

control. Because

never

the

modems'

mode.

bps

and

higher.

A. The following

of

the

nature

recommended

error

See

Chapter

for calls

control

7,

error

it

For

of

and

&M2 Reserved.
&M3 Reserved.
&M4

Normal/

remote

trol
Normal

NOTE: V.32

transfer

modem

signals-V.42,

mode,

data
control. To
and

remote,
modems,
connection,

&MS ARQ

mode.
error-control
hangs

up.

ARQ

mode.

doesn't

as

bis

modems

at

high

avoid

should

if

unable

drop

to 2400 bps.

If

the

request-V.42,

This

recognize

HST

or

though

it

reverting

speeds

this, V.32

always

to establish

remote

setting

the

MNP-the

were

set to

without

bis

and

be set for

an

error

modem

HST

or

is

the

default.

Courier's

modem

If

the

error

con-

operates

in

&MO.

to

Normal

the

V.32

error

mode
reliability
modems,

control. HST

of

error

local

control

doesn't

Interface Controls 4-5

recognize

MNP-the

the

Courier

COURIER HIGH SPEED MODEMS

-

With Auto Answer

When

set to &M4

off

hook

and
modem
ARQ
it
hangs

FLOW CONTROL OVERVIEW

This feature controls

modem's
in
ments,
disabled.

Users
protocol
under

NOTE: Flow control of
required

Flow

unless, for example,
very

doesn't

mode

doesn't

computer

receive

up.

Transmit

the

Courier

at

Hewlett

should

Received

under

Control ( &Hn). Received

slow

computer.

or

responds

receive

(&M4), it

the

and

terminal

Packard

note

Data

the

&MS

and

a call comes in,

to received

those

answers

signals

the

flow of

and

Receive

equipment

is

shipped

installations

the

HP

Softioare

data

circumstances described

you

are

error

signals

and

with

settings,

Control (&In).

from

writing

and

the

call

in

is set to

data

into

data

buffers.

and

all flow control

that

&13

the

DTE to

Data

flow control is

incoming

control signals.

is set to

Normal

ARQ

and

in

and

the

mode

mode

out

Due

software

use

the

&14,

the

under

files to

modem

Normal/

of

to variations

options

ENQ/

described

modem

Transmit

not

goes

If

the

(&MO).

(&MS), it

the

require-

ACK

is

Data

as

critical

disk

on

-

-

If

-

-

-

-

-

-

a

-

Transmit Data Buffer Sizes

The size
connection is

If

reduced

of

Received Data Buffer Size

The

4-6 Interface Controls

of

the

• ARQ connections: 3.2SK bytes.

•

Non-ARQ
control file
Ymodem

bit

3 of Register

to 128 bytes, for

slower

modems.

size of this

Transmit

under

without

buffer

data

buffer

error

control

connections: 1.SK bytes,

transfer

flow control.

SlS

is

turned

the

See S-Register Summary, SlS,

remains

or

protocols

on,

convenience of

constant

depends
not,

as

such

the

non-ARQ

at

on

whether

follows.

allowing

as

Xmodem

buffer

some

remote

in

2K bytes.

the

use

of

error

and

size is

users

Appendix

B.

-

-

-

-

-

-

-

-

-

COURIER HIGH SPEED MODEMS

TRANSMIT DATA FLOW CONTROL (&Hn)

This

type

of flow control is for

its

attached
modern
buffer
stop

transmitting.

the

link

transmitting.

When it is Required

DTE,

monitors

approaches

to half

that

is,

its

buffer

90% capacity,

When

empty

the

data

by

your

as

data

the

modern

buffer, it signals

transmitted

computer

comes from

the

modem

has

or

sent

the

to

the

terminal.

the

DTE.

signals

enough

DTE to

modern

The

the

DTE to

data

resume

If

by

the

over

-

-

-

-

Transmit
situations.

NOTE:
control. Your
type

if

possible. Review
with
manuals.

Hardware Control

The
sending
capacity.
half full.

Software Control

The

(XOFF) character, <CTRL-S>,
capacity. The
<Ctrl>-Q,
are

Data

• You're
300 bps),

•

The

DTE

the

DTE is

bps

and

DTE
The

you

select,

the

modern

modern

modern

as

drops

to

the

It

starts

when

follows:

flow control

using

the

rate

modern

software

although

DTE

sends

modem

the

should

error

control

with

or

without

rate

is

higher

sending

link

of

19.2K

the

and,

the

when

sending

the

buffer

data

rate

is 14.4K bps.

bps

uses

either

and

machine

we

recommend

quick-configuration

if necessary,

Clear

to

the

CTS

DTE

the

sends

is

about

be

enabled

(any

allowable

data

compression.

than

the

to

the

modern

and a link

hardware

must

your

Send

(CTS) signal it's

modem's

again

standard

when

the

buffer

when

its

buffer

ASCII

half full. ASCII definitions

in

link

rate, for

at

Another

rate

of 2400 bps.

or

software

support

hardware

guide

software

nears

the

buffer

ASCII

nears

Transmit

the

38.4K

and

Transmit

ON

following

speed

above

example,

or

19.2K

example

flow

whichever

flow control,

that

came

computer

been

90%

is

about

OFF

90%

character,

is a

-

XON
XOFF

<Ctrl>-Q
<Ctrl>-S

(ASCII 17 Decimal,

(ASCII

19

Decimal,

11

Hex)

13

Hex)

Interface Controls

4-

7

COURIER HIGH SPEED MODEMS

-

NOTE: You
hardware
that

you

&HO

&H1

&H2 Software flow control. Requires

&H3 Use

WARNING:
may

lose

from

other
remote
modem

Ctrl-S (XOFF)
files,

and

these characters

and

ters

may

have

to set

your

software

or

software

turn

off
Transmit
Hardware

that

your

at

the

RS-232 interface.

support
follow. The ASCII characters
Registers S22
includes

unsure
option. But
software

system:

has

XON

both

about

If

data

if XON

sources.

sent

and

are

used

dropped

flow control.

the

type

you

are

not

Data

flow control disabled. Default.

flow control.

DTE

and

/XOFF

and

S23

an

ASCII chart.

hardware

what

keep

the

flow control.
possible,

/XOFF

They

an

XON from

an

XOFF,

Ctrl-Q (XON) characters also
by

Xmodem-type

misinterpreted

from

the

Recommended

software

signaling. See

in

Appendix

and

software

your

equipment

warning,

always

characters

may,

for

the

can

result

data

use

example,

remote

as

modem

stream.

Some

support

may

hardware

in

protocols. You risk

as

well

to

either

programs

using. -

Clear

that

your

the

be

user-defined. See

B.

That

flow control.

supports,

above,

in

occur

come

system,

buffer

flow control charac-

also

require

setting. Requires -

to

Send

(CTS)

software

guidelines

appendix

mind

flow control. You

in

the

from

after

overflow.

occur

that

If

you

select this

about

data

stream

the

your

in

binary
having

also

are

-

-

-

-

-

-

-

-

Guidelines

If

your

terminal

of

software

transferring text files.

However,
an

Xmodem-type

In

addition,

the

DTE

4-8 Interface Controls

if

and

or

software

flow control

you're

be

transferring non-text (binary) files,

protocol, disable flow control

sure

the

link

rates

may

modem

are

equal.

does

prove

not

is set to

support

satisfactory if

&BO

Clear

entirely

and

to

you're

&NO,

Send,

only

or

using

(&HO).

so

that

use

-

-

-

-

-

-

COURIER HIGH SPEED MODEMS

RECEIVED DATA

Separate

trol the flow of Received
DTE. Because
faster

rate

may

want

Your

software
select,
possible. Review the quick-configuration
the

modem

manuals.

Hardware Control (&Rn)

When

modem
again

when

Your

DTE
type

of

constant

WARNING:

control) calls,

control across the

there

is

data.

If

remote
buffer

FLOW

although

the

stops

flow control,

no

your

modem

will overflow.

CONTROL

commands,

most

than

the

to

leave

this

and

we

and,

if necessary,

DTE

drops

passing

it is

ready

and

software

RTS signal.

Use this
because

phone

way

to signal

modem

keeps

&Rn

(hardware)

Data

computers

modem

machine

recommend

receives it

type

of flow control disabled.
must

its

Request

along

received data.

to receive.

must

however,

type

of

under

error
link.
the

remote

stops

passing

sending

and

passed

your

support

if

flow control

During

across

by

handle

over

support

hardware

software

to

Send

RTS.

your

software

control

non-ARQ

modem

data

the

incoming

&In (software), con-

the

Courier

the

whichever

flow control, if

guide

and

(RTS) signal,

The

You

only

the

modems

to

to

the

link,

the

to

your

data

at a much

phone

stop
DTE

line,

type

that

came

computer

the

DTE

sends

cannot

requires

for ARQ (error-

connections,

use

a

use

sending
and

the

Received

you

you

with

RTS

this

flow

Data

-

-

-

-

&RO

Delay

Clear

(RTS/CTS delay). The
synchronous
asynchronous

&R1

The

modem

required

&R2

Hardware
modem
signal.

Software Control (&In)

When

you

the

keyboard,

sends

send

the

to

Send

Response

delay

is

mainframes

calls. See

ignores

if

your

DTE

flow control of received

data

the

modem

modem

and

does

Chapter

RTS.

Default. This

or

software

to

the

DTE

a <Ctrl>-S (XOFF)

stops

passing

after Request to

required

not

apply

7.

does

not

data

only

on

receipt of

received

Interface Controls 4-9

Send

by

some

to

setting

enabled.

command

is

support

data

to

The

the

from

the

signal

RTS.

RTS

COURIER HIGH SPEED MODEMS

-

DTE.

When

you

send

a <Ctrl>-Q (XON)
resumes. (Hold
type

the

angle

key

on

the

WARNING:
modem
escape code. But
modem
characters
reads
cases, the

&IO

&Il The

recognizes

also looks for <Ctrl>-S

them

Disables XON
Default.
calls,
all characters except the escape
because
control characters.

NOTE: Because of
warning,
for
characters.

and
mode
characters
XON
remote

down

brackets.

keyboard.)

In

ordinary

when

occur

in a file

as

XON

modem

users

Courier

passes

drops

Recommended

but

see

at

this

the

whose

them

only,

sent

/XOFF

modem.

the

during

/XOFF

/XOFF

&IS.

setting

settings

data

acts

but

keep

to

signaling

command,

Ctrl

key

and

press

The

brackets

operation,

a call

software

or

as

part

characters

them

from the

flow control of received

The

IO

the

the

risk

that

does

on

your

to

the

remote

in

mind

the

remote

between

See &I2.

indicate

the

only

are

the

three

flow control is

or

<Ctrl>-Q characters.

of a protocol,

and

data

for

non-ARQ

option

typed

provides

code

modem

described

follow

not

include

XON

computer.

that

computer

the

are

does

the

the

the

letter.

a special,

characters

pluses(+++)

enabled,

the

modem

acts

on

them. In

stream.

data.

(Normal

sequence(+++),

not

in

the

only

XON

/XOFF

XON/XOFF

may

remote

mode)

transparency

look for

above

recommended

/XOFF

commands,

Use

in

interfere

computer

modem
Don't

named

the

of

the

If

these

some

control

ARQ

with

and

the

for

-

-

-

-

-

-

-

-

-

-

&I2 The

4-10 Interface Controls

Courier
removes
them

to
remote
characters
the

recommended

However,
control
modem
remote
and

your

reliable control in

acts

them

from

the

remote

computer

with

if

the

on

the

phone

and

it

stops

computer

modem's

on

your
the

computer.

does

those

from its

setting

call is

link.

passing

and

buffer

non-ARQ

XON/XOFF

data

stream

not

confuse

attached

for ARQ

not

in

ARQ

If

you

data,

modem

may

mode,

commands,

instead

This

ensures

your

XON

modem.

mode.

mode,

send

it

to

stop

overflow. For

an

has

sending

see

&IS.

there

XOFF to

no

of

passing

that

the

/XOFF

This is

is

no

way

to tell

for a while,

more

but

flow

your

-

-

-

the

-

-

-

-

-

&13

&14

&15

Hewlett
attached
protocol. Use

Hewlett
modems
the
Appendix

This setting is
phone
control.
must

In
does
mands,
error
flow of

In
though
for
looks for XON

link.

mands,
data
stream.

Packard-Host

to

an

Packard-Terminal

attached

ENQ/

ACK protocol.

E.

link

when

For

this to

have

&15

ARQ

mode, a Courier

when

set to

but

does

control

non-ARQ

your

When

over

protocol

data

on

mode, a Courier

flow control

typed

the

the

Courier

the

COURIER HIGH SPEED MODEMS

HP

mainframe

in

ARQ

mode

to

terminals

designed

the

connection

work

capability.

&12.

It

not

pass

enables

the

phone

were

XON/XOFF

/XOFF

link

characters coming

remote

either

and

drops

Mode.

that

only. See
Mode.

Use

in

to

enable

for

you,

set to

acts

on

them

the

link.

set

disabled

commands.

operator

resumes

the

Applies

uses

Appendix

Applies

in

an

HP

ARQ

mode

flow control

is

not

under

the

remote

&15

operates

your

XON

to the

remote

modems

to

&15

(&IO):

sends

XON/XOFF

or

stops

characters

only

to

the

ENQ/

only

system

only. See

on

error

modem

the

/XOFF

system.

to control the

operates

it

does

However,

in

over

the

transmitting

from

modems

ACK
E.

to

that

uses

the

same

as

com-

The

as

not

look

it

phone

com-

the

data

it

-

-

If

both

modems

signal

the
controlling
preventing
At

the

DTE/DCE
control
settings.

Guidelines

Use of
only
text (binary) files,
flow control entirely (&R1,
&BO

software

transferring

and

the

&NO,

are

remote

flow control

text files.

so

the
their

flow

or

using

that

modem

data

own

interfaces,

of

the

set

to

&15,

to

flow

on

modem's

data

through

may

prove

However,

an

Xmodem-type

&IO).

In

DTE

and

operators

stop

sending,

the

phone

buffer

the

modems

their

satisfactory if

if

you're

addition,

link

rates

Interface Controls 4-11

at

each

thereby

link

and

from

overflowing.

independently

Transmit

transferring

protocol,

set

the

modem

are

equal.

end

can

Data

(&H)

you're

non-

disable

to

COURIER HIGH SPEED MODEMS

-

DATA COMPRESSION (&Kn)

When

data

compression
detects
units
redundant

Compression
establish
should
described earlier

&KO
&Kl

&K2 Data

&K3 Selective

redundant

of fewer bits.

data

units

does

an

error

be

set for

Data

Auto

enables
disables
&BO.
throughput
equal:

modem

for V .42
(MNPS) compression. Use this

binary

compressed.

Transmit
in

compression

enable/

compression

compression

The

reason

compression

compression

from

data

bis

files, .ARC files,

is

enabled,

bits of

control connection. In

compression,

data

The

receiving

before

not

this chapter.

disable. This is

advantage

disabling

compression. The

See the

passing

occur

unless

Data

disabled.

if

if

is

that

may

enabled. Use this

note

the

and

recodes

modem

them

the

flow control

the

the

DTE

rate

the

DTE

compression

when

the

even

degrade

compression.

and

disables

setting

and

other

below.

transmitting

them

decompresses

to

the

modems

addition,

(&Hl, 2 or

default.

is fixed, &Bl,

rate

follows the link rate,

offers

DTE

and

setting

modem

MNP

to

files

that

modem

into

shorter

receiving DTE.
are

able to

the

modem

The

modem

no

link

rates

throughput.

to

keep

negotiates

Level 5

transfer

are

already

the

3),

and

8-bit

as

are

the

only

-

-

-

-

-

-

-

-

-

If

the

Courier
negotiates V.42
connection
compression.

If

the

for

MNP
modem
MNP

NOTE: MNPS
that

are
from
to

the
transmission
compression

4-12 Interface Controls

remains

Courier

Level 5 (MNPS)

does

error

control,

already

many

Bulletin Boards

modem

is connecting

bis

compression.

under

is connecting

not

have

MNPS,

but

without

compression

compressed,

to

be

compressed.

so

that

throughput

dynamically

with

a V.42

error

control,

with

an

data

compression.

the

compression.

is

not

such

and

8-bit

over

detects

or

If

V.42

bis

but

MNP

modem,

connection

useful

when

as

the

.ARC files

binary

MNPS

when

the

tends

link

data

HST

is

not

without

If

remains

files,

to

degrades.

is

modem,

the

already

it

feasible,

it negotiates
remote

transferring

which

add

the

data

under

downloaded

appear

data

V.42

com-

files

to

the

bis

-

-

-

-

-

-

-

COURIER HIGH SPEED MODEMS

pressed
to
throughput

See
for
ferent

DATA RATE COMMANDS

The
fixed
faces.
software
(&Bl) so
link.

You'll

phone
control,

For
enables

remote

the

only
your
rate,

and

turns

advantage.

The

for

Throughput Guidelines

more

information,

kinds

of files.

&Bn

and

&Nn

data

rates

Throughout

allows,
that

it

get

greater

link. Just

preferably

the

phone

link

the

modem

modem,

link

rate

is fixed, for

connects

application

you

may

with

wish

off

until

it detects

special &K3

already-compressed

including

commands

at

the

DTE

this

manual

you

select a fixed

can

remain

throughput

remember

hardware

we

recommend

to

switch

no

matter

example

modems

requires

to set

setting

and

Data

throughput

allow

and

link
we

higher

what

connections

the

than

regardless

to also

(&Hl).

its

link

the

at

operating

modem

that

compression

enables

files.

Compression

you

(modem-to-modem)

recommend

rate

at

the

enable

variable

rate
remote
9600

at

with

to a fixed link rate.

the

in

to

expect

to select

that, if

the

DTE interface

rate

on

of

the

call's

Transmit

rates

to

match

modem's

bps

(&N6),

that

rate.

modems

best

Appendix

variable

the

Data

(&NO).

the

Of

will

for dif-

or

inter-

your

phone

rate

on

flow

This

rate

rate

is.

the

modem

course, if

at

only

work

A

the

of

a

If

one

-

-

Software Requirements

Both

variable
support.
rates.

Not
support
configuration
software
the

version

and

Most

communications

all

software

is increasing

guide

documentation

in

the

fixed

rates

require

programs

supports

in

program

that

came

if

quick-configuration

with

your

fixed rates,

updates.

your

software

communications

support

although

Check

modem

is a

later

guide.

Interface Controls 4-13

software

variable

this

the

quick-

and/

or

version

your

than

COURIER HIGH SPEED MODEMS

-

DTE Rate Select (&Bn)

Use this
interface. Initially,
your
from the
the

&BO

&Bl

command

terminal

rate

DTE

rate

Variable rates. Default.
link
rate, it also switches its DTE rate.
terminal also switches DTE
This setting
&NO,
the

rate

Fixed rate. The
DTE
software,
throughput,
high

This
the

DTE

addition,

In
control
that

or

at

which

depends

rate

to connect

so

that

of the

at

the

speed

setting

rate

enabled,

the

modem's

to select variable

the

modem's

software

requires

rate

regardless

set

calls

is

this setting

setting.

it receives

on

the

modem's

When

with a modem

variable rates

the

Courier

remote

modem

at

which

the DTE to 57.6K, 38.4K

and

not

affected

must

be

preferably

buffer

can

modem.

always

you

of

the

to

at

equal

requires

doesn't

or

fixed rates

DTE interface

The

modem

the

AT

command.

&B

setting,

the

modem

operating

The

software

rates

to

match

on

the

switch

have

link

least 9600

by

to

or

hardware

link

communicates

set

the

rate. For

bps

the

&N setting.

higher

than

Transmit

control

overflow.

at

the

DTE

rate

depends

detects this

After that,

as

follows.

switches its

at

the

link

phone

rates

to

terminal

the

greatest

or

19.2K

for 2400-bps calls.

However,

the

link

Data

(&Hl),

on

rate

a different

or

rate.
link,
match

with

the

or

bps

for

rate.

flow

so

-

-

-

-

-

-

-

-

-

&B2

Fixed for ARQ
mode
in

ARQ
rate, for
under
to

&BO
rate

of

This

option
Boards
ranging
advanced

4-14 Interface Controls

calls/Variable

only.

When

mode,

it shifts its DTE

example,

error

control,

and

switches its DTE

each

call.
is

designed

that

receive calls

from

the

design.

the

modem

19.2K bps.
the

modem

for installations

from a wide

very

slow

for

goes off
rate

If

rate

to

those

non-ARQ

up

the

connection

behaves

to

match

variety

with

calls.

Answer

hook

and

connects

to a user-specified

is

not

as

if it

were

set

the

connection

such

as

Bulletin

of

modems,

the

Courier's

-

-

-

-

-

-

-

To

implement
CONNECT
Data

flow control,

the

desired

settings]
The

along
connection,
DTE rate.

When
sure
the

&W

modem

with

sending

your

correct

software

this feature, set

result

codes,

preferably

rate,

and

send

command

stores

the

the

settings. Each

the

modem

subsequent

is set to

rate

is

maintained.

COURIER HIGH SPEED MODEMS

the

&Al

or

&Hl.

the

modem

string.

rate

of

the
time

checks

NVRAM

configurations

your

modem

&A2,

command

it

selected DTE rate, so

and

Set

your

an

makes

for

to

return

to

Transmit

software

AT

&82

[other

in

NVRAM

an

ARQ

the

specified

to NVRAM,

ARQ

to

be

that

-

-

-

Link Rate Select (&Nn)

Use

this

command
interface. Variable rates
variety

&NO

&N1-9Fixed rate. The

of

remote

Variable rates. Default. The
remote
ing
recommended

modern
hangs

The
DTE rate,
DTE rate,
hardware
doesn't

If

you

speed,

modem

on

the

is

up.

link

overflow.

wish,

for

rate

to select

modems.

capabilities of

operating

must
never
enable
control

you

security

variable

allow

for

the

setting.

modem

at

always

higher.

Transmit

(&Hl),

can

filter

or

other

the

modem

highest

the

remote

only

the

same

be

If

the

Data

so

that

out

reasons,

or

fixed

to

Courier

connects

lower

link

calls

negotiates

possible

modem.

rate. If not,

than,

rate

flow control,

the

modem's

at

other

by

rates

at

connect

link

rate,

if

the

remote

or

equal

is

lower

than

fixing

the

link

with

a

with

depend-

This is

the

preferably

buffer

the

the

modem

to,

the

than

the

a specific

link

the

rate.

-

Interface Controls 4-15

COURIER HIGH SPEED MODEMS

-

The
valid

operations.

&N1
&N3
&NS
&N7
&N9

Data Set Ready (&Sn)

The

modem
RS-232 interface. (Data Set is
if

any,

commercial
modem
overridden,
a different setting.

&SO
&S1

&S2 This

to control DSR, &S1. Leave

DSR is

In

Originate
when
Answer
answer

automatic
sends a pulsed
following

options

only

for V.32

300
2400
7200

12.K

16.SK

sends

&SO,

unless

always

it detects

mode,

tone.

option

callback units.

Carrier

are

as

follows. Rates

bis

and

HST

bps

bps
bps
bps

bps

the

DTE a

communications

you

ON

(override). Default.

mode,

the

the

modem

is for specialized

DSR signal

Detect (CD).

&N2 1200
&N4 4800

&N

&NS 14.4K

(HST-to-HST only)

Data

industry

know

the

modem

remote

modem's

sends

On

with

above

operations,

bps
bps

6 9600

Set

Ready

jargon

programs

the

that

sends

equipment

loss of carrier,

Clear

bps

(DSR) signal

for

modem

your

installation

DSR after it dials,

answer

DSR after it

to

9600

bps

not

V.32

bps

modem.)

require

such

Send

the

set for DSR

tone. In

sends

as

the

(CTS)

are

via

Few,

requires

an

modem

the

-

-

-

-

-

-

-

-

-

-

&S3 This is

4-16 Interface Controls

the

same

as &S2,

but

without

CTS following CD.

-

-

-

-

-

-

COURIER HIGH SPEED MODEMS

-

-

-

-

DATA TERMINAL

This

command,
(DTR) signaling from
factory set
override

If

you
session,
&D

command.
quick-configuration
communications
required.

NOTE:
to

the

volatile
&DO

&Dl

READY

disabled.

want

you

At

DIP

memory

DTR override.
always

If

you
modem,
call
packages
functions similarly
&Dl
modem
setting

If

DIP Switch 1 is
&Dl
However,
issuing

(&On)

like DIP

the

with

DIP

switch

to

change

can

power-on

switch

ON.

issue this

you

by

toggling

will

in

of DIP

command,

&Dl,

the

either

Whichever

guide

software

and

setting. This

as a power-on/reset

The

can

have a method

always

online

switch

if

you

the

change

command

DTR. (Most

DTR

switch

enter

maintain

command

ON

change

DIP

1, controls

DTE to

1 OFF, for

modem's

the

method

that

came

manual

reset,

the

command

modem

online

for toggling DTR.)

to

the

9.
(DTR override)

override

the

switch

Data

the

modem.

normal

DTR

operations

DIP

switch

you

choose, check

with

the

to see

which

modem

operates

before

command

communications

escape

the

mode,

setting

setting

operates

is

not

default.

as

connecting

code(+++),

connection

regardless

when

is

automatically

of DIP

takes precedence.

Terminal

The

modem

operations

during

position

modem

setting

stored

though

mode

according

with

software
&Dl
except

and

put

of

you

switch

or
either
or

is

in

DTR is

during

turned

Ready

is

and

use

your

non-

another

that

the

the

issue

1 after

the

a

the

the

a

the

off.

-

-

-

-

&D2

Return
H

Normal
send
Dropping

online

command.

DTR operations. The

a DTR signal for

with

DTR

the 0 command,

the

modem

terminates

a call.

or

hang

up

with

terminal

or

computer

to accept

Interface Controls 4-17

commands.

the

must

COURIER HIGH SPEED MODEMS

-

CARRIER DETECT (&Cn)

This

command,
signaling from
with

DIP

switch

disabled.

If

you

want

to

RACK

during
or
either
or
required.

NOTE:
to
volatile

&CO
&Cl

CONTROLLER UNIT ACCESS (%Rn)

If

Modem

an

(RCU)
%RO

a session,

use

the

&C

the

quick-configuration

your

communications

At

the

DIP

switch

memory

CD

override,

Normal
when

disconnect.

the

Courier

Management

operator

at a remote

Normal

power-on

it connects

to

like DIP

the

modem

6 OFF,

change

command.

as a power-on/

CD

modem

use

operations,

normal

the

you

can

and

setting. This

CD

operations. The

with

is

System,

the

modem

site.

switch

always

part

6,

controls

to

the

DTE.

CD

operations

modem's
either
Whichever

software

reset,

RCU access disabled. Default.

Carrier

change

guide

manual

the

modem

command

reset

ON.

Courier

another

of a USRobotics Total

setting

to call a Rack Controller

The

the

method

that

came

is

default.

modem

the

modem

Carrier

Detect
DIP

to see

Detect (CD)

modem

and

operations

switch

you

choose, check

with

which

operates
not

stored

sends a CD

and

drops

to %Rl allows

is factory set

the

override

position

the

modem

setting

according

in

non-

signal

CD

on

Control

Unit

-

-

-

-

is

-

-

-

-

-

-

%Rl RCU access enabled.

TOUCH-TONE RECOGNITION MODE

This

command
Touch-Tone frequencies of
primarily
integrated
could

be

T

one

security

4-18 Interface Controls

for

use

into

used

in a security

codes.

enables

with

certain

the

network
software

{%

T)

modem,
dialing

applications,

programs.

program

when

off hook,

modems.

to

identify

%Tis

but

For

example,

to

detect

meant

may

also

incoming

the

be

% T

Touch-

-

-

-

-

-

-

-

To

enable

off hook.

To

return

the

this feature,

Then

type

the

modem

DTE's DTR signal. The

COURIER HIGH SPEED MODEMS

type

ATHl

<Enter> to force

AT% T <Enter>.

to

Command

modem

mode,
responds

press

OK.

any

the

key

modem

or

drop

-

-

-

-

-

Interface Controls 4-19

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

COURIER HIGH SPEED MODEMS

-

The

commands

first

group

concerns

your

own

power-on
memory
the

or

code, echoing,

NOTE:

modern

(NVRAM). The

modem's

to

include

When
retains

•

Change
Issue

•

ware
resets to
(NVRAM).
resets to
(ROM).

Issue

•

settings.
Turn

•
on,
defaults
switch

the

explained

default
defaults

local

operating

in

your

default

and

other

you

change a default

that

setting

the

setting.

the

ATZ

defaults.

the

defaults

If

DIP

the

factory settings

the

AT &F

the

modem

modem

(DIP

switch

10 DOWN).

CHAPTER

in

this

chapter

configurations, for

to

nonvolatile

remaining

characteristics, for a
configuration.

options.

until

you

command

If

DIP

command

off

loads

switch

stored

switch

and

either

10

OFF)

to reset

10

to

power

5.

INTERNAL CONTROLS

are

of

two

types. The

example,

random

commands

They

setting

in

is

stored

the

during

do

one

of

the

modern

10

is OFF,

nonvolatile

DOWN,

in

load

the

it

on

nonvolatile

or

the

factory

access

are

used

current

include

a session,

the

following.

the

modern

memory

the

modem

read

only

modem's

again.

memory
settings

to its soft-

At

writing

to select

session

result

the

memory

factory

power-

(DIP

SETTING/US/NG DEFAULTS

The

modem's
modem's
access

memory

figuration

defaults.

WRITING DEFAULTS

When

you

NVRAM if DIP

write

your

the

same

read

factory settings. The inclusion

(NVRAM) allows

and

write

TO

NVRAM

power

switch

own

settings to NVRAM,

as

the

permanent

only

memory

the

settings to

(&

on

the

Courier,

10 is OFF (factory setting).

(ROM)

you

NVRAM

W)

it

loads

the

ROM factory settings.

permanently
of

nonvolatile

to

define

your

as

your

the

settings

defaults

Internal Controls

stores

own

power-on

stored

Until

stored

the

random

con-

in
you
there

are

5-1

COURIER HIGH

SPEED

MODEMS

-

You'll find a list of NVRAM
Appendix
the I (inquiry)

If

you've
throughout
ration,
saved.

You
mand
example
configuration

After
setting just for
The NVRAM configuration

But
NVRAM
substituted

send

may

string

sending

if

you

B.

You

can

also

command:

ATl5 <Enter>

sent

the

modem

your

session

just the &W

AT&W

also specify

sets the

AT

A

want

at

AT

<Enter>

that

ends

modem

in

NVRAM.

X4

&81

a configuration to NVRAM,

the

current

TX7

<Enter>

the

the

same

for the

X7

X4

&W

commands

and

command.

the

entire configuration

with

for

&H1

session, as

new

setting to

time, as in the following example.

setting

<Enter>

options

display

want

the &W

the

current

M3

&W

remains

stored

and

factory settings

them

by

to

change

to

save

The

current

command.

session

<Enter>

in

the

intact.

be

a default,

earlier.

in

selecting

your

in

you

following example.

option

settings

current

settings

a single com-

The following

and

can

write

configu-

are

stores the

change

it to

X7

any

is

-

5 of

-

-

-

-

-

-

-

-

LOADING THE FACTORY DEFAULTS (&F)

If

DIP

switch
power-on
the

options

If

the NVRAM defaults

OFF)

and

following

If

NVRAM defaults
listing
current
listing

5-2 Internal Controls

10 is

DOWN,

instead

you

command:

AT&F

of

factory defaults, first

settings.

of

the

AT&F

of the NVRAM defaults. Factory settings for

that

are

stored

want

to

load

<Enter>

are

Then

include

newly

current

14

<Enter>

the

factory settings

in

NVRAM

are

loaded
the factory defaults instead,

loaded,

load

the

settings, as in

but

14

are

at

power-on

you

want

them

inquiry

are

loaded

in

Appendix

(DIP

switch

to

view

a screen

(&F), to

the

make

option

to

display

following example.

at

B.

use

them

10

the

the

-

-

-

-

a

-

-

-

COURIER HIGH SPEED MODEMS

-

-

-

-

To

restore

described

RESET

STORING A COMMAND STRING (&ZC=s)

(Z)

If

you've

your

The
NVRAM
switch

NOTE: Use
position
that
initiate a
modem

You
voice/

Write
command,
may
following
link

your

NVRAM

next. (DIP

changed

power-on

ATZ <Enter>

modem

defaults

10 DOWN).

of

DIP

the

modem

new

off

can

store a

data

switch. This

1)

Store

2)

Program

command

your

command

where

be

up

to 30 characters long;

example

diagnostics screen

reads

the

setting

and

the

several

defaults,

its DIP

(DIP

ATZ

switches

can

read

on

again.

string

command
the

string

s is

assigns a

defaults,

switch

command

for switches 2-5, 7

voice/

the

10

current

type

switch

switch

2-5, 7

the

of

commands
requires

string.

data

when

string

to

command

command

when

the

10 OFF)

or 9 while

new

pressed.

NVRAM

you

use

the

must

be

settings

following

settings

or

also if

you've

setting. The

and

to

be

two

steps.

switch

string.

spaces

press

are

string

the

ATZ

command

OFF.)

and

want

command:

and

resets

factory

changed

the

modem

only

9 is to

executed

to execute

with

the

The

command

not

counted.

that

voice/

to

reset

either

settings

the

is on, so

other

turn

the

with

the

stored

&ZC=s

displays

data

switch.

to

(DIP

way

the

string

The

to

its

to

the

-

-

AT&ZC=l6 <Enter>

The

function

ting

of
voice/
setting Register S32 to 9

Note

that

of

the

other

the

stored

of

the

voice/

Register S32,

data

switch

ATS32=9 <Enter>

you

command

function to execute

can

reset

available functions.

as

string

data

switch

described

with

the

the

voice/

with a new

is

determined

in

Appendix

stored

command string

following

data

Additionally,

command.

switch

one

at

Internal Controls 5-3

E.

at

you

any

Set

any

time.

by

the

time

can

overwrite

the

to

set-

by

one

COURIER HIGH SPEED

MODEMS

-

Once

you've

all

you

want

the

NOTE: This feature is especially
between
details.

STORING TELEPHONE NUMBERS (&Zn=s)

The

modem

Write

n is

position 0 through

The

number-string

any

Dial
tone-dial
Dial

command.

because

The following

second

The DSn

example

stored

need

to

command

synchronous

stores

the

numbers

command

(T)

and

there

AT&Z=T9W5551234 <Enter>

position.

AT&Z2=1 516 555 1234 <Enter>

command
to

dial

your

command

do

is

press

the

voice/

string

executed.

and

asynchronous

up

to

four

frequently

to

NVRAM

3,

and

s is

may

be

up

to 36 characters long,

options. The following

wait

for a

second

The

number

is

non

example

We've

is

the

number

parameter.

used

is

stores a long-distance

added

to

dial a stored

stored

with

stored

spaces

string

and

data

switch

useful

if

you

calls. See

dialed

the

&Zn=s

the

phone-number

dial

tone

at

position

for readability.

number,

at

position

set

Register S32,

whenever

frequently

phone

command,

example

(W)

options

0,

number

2:

switch

Chapter

numbers.

where

string.

including

includes

of

assumed

at

the

as

in

this

you

7 for

the

the

-

-

-

-

-

-

-

-

-

NOTE: Do
call

requires
before
error

The
To

command:

RESULT CODES

Four
to

5-4 Internal Controls

the

control) is

previous

return

commands

the

screen:

to

ATDS2 <Enter>

not

include

a special setting,

DSn

command.

inserted

AT&MO DS2 <Enter>

command

the

default

AT&M4

control

modem

before

establishes

error

<Enter>

the

insert

In

the

control

result

settings

it

in

following

the

Dial

&MO

mode,

codes

in

the &Z string.

the

command

example,

command:

as

the

current

issue

the following

that

the

modem

string

&MO

setting.

If

the

(no

returns

-

-

-

-

-

-

-

-

V n

Numeric I verbal

Qn

Display I suppress

&An

Display I suppress

Xn

Result

code

response

subset

COURIER HIGH SPEED MODEMS

mode

all

result

codes

additional

result

code

subsets

-

-

-

Response Modes

Result
or

numbers
Verbal
the

V n

current
At

power-on

DIP

switch

memory

VO

Vl

Quiet Mode (Qn)

(Vn)

codes

are

sent

to

(Numeric

mode

when

command

session,

and

setting.

as a power-on/

Numeric

Carriage
example,

Verbal

by a Carriage
example:

Mode.

ATD1234567 <Enter>

becomes

3TD1234567 <Enter>

Mode.

ATD1234567 <Enter>
NO CARRIER

Mode).

it is

powered

to

select

independently

reset,

the

The

Numeric

Return

where

but

a 3 is

Verbal

Return

the

screen

verbal

modem

Vn

command

reset

no

returned

responses

and

in

either

The

Courier

on

(DIP

or

numeric

of

the

DIP

operates

is

default.

result

codes

Line Feed,

(for

are

a Line Feed,

words

is factory

switch

result

switch

according

not

stored

are

as

in

the

NO

CARRIER).

preceded

as

(Verbal

set

2 is OFF).

codes

setting.

to

in

nonvolatile

followed

following

and

in

the

following

Mode)

to

Use

for a

the

by

a

followed

-

-

Enable/suppress
shipped
the
independently

At
DIP
volatile

QO

Ql

Q2

with

Qn

command

power-on

switch

memory
Result
Result
Result

DIP

and

setting. The

codes
codes
codes

the

display

switch 3 DOWN,

to

control

of

the

switch

reset,

as a power-on/reset

are
are
are

of

the

setting.

the

modem

Qn

command

displayed.
suppressed
suppressed

result

to

display

operates

(made
only

codes.

display

is

default.

The

Courier

result

codes.

for a

current

according

not

stored

quiet).

in

Answer

Internal Controls 5-5

session,

in

non-

mode.

to

is

Use

the

COURIER HIGH SPEED MODEMS

-

Additional Result Code Subsets (&An)

Use this
sets of

&AO

&Al

&A2 HST

23/CONNECT
27
28/CONNECT
29/CONNECT
30/CONNECT
34/CONNECT
31/CONNECT
32/CONNECT
35/CONNECT
36/CONNECT
53/CONNECT

command

error

control,

ARQ (error control) codes
not

affect

the

standard

enabled.
ARQ

codes

sent

to
connection
modem
1200 to 14.4K bps. The
connection

14/CONNECT / ARQ
15/CONNECT
16/CONNECT
17

/CONNECT

19/CONNECT

/V32
included
your

software

information, select

/CONNECT

to

enable/

modulation

an

error-control connection;

CONNECT

are

enabled.

the

screen

is established.

is

set

to

XO

rate

and

1200/

2400/
9600/
4800/

modulation

for

users

cannot

9600/HST
9600/

ARQ/HST
4800/HST
4800/

ARQ/HST
7200/HST
7200/

ARQ/HST
12000/HST
12000/

ARQ/HST
14400/HST
14400/

ARQ/HST
16800/HST

when

ARQ
ARQ
ARQ 47
ARQ

of HST

disable

and

remaining

require a setting

codes

handle

&Al

one

or

protocol

are

disabled. This

messages

One

of

the

a successful

Message

the

connection

22/CONNECT
24/CONNECT
26/CONNECT

/CONNECT

are

enabled. This

Dual

Standard

the

added

or

&AO.

or

33/CONNECT

or

37

/CONNECT

or

38/CONNECT

or

39/CONNECT

or

40/CONNECT

or

44/CONNECT

or

41/CONNECT

or

42/CONNECT

or

45/CONNECT

or

46/CONNECT

or

57/CONNECT16800/

of

the

following

result

the

if

result

following

error

14 is

displayed

is

results

of Xl

12000/
7200/
14400/
16800/

modulation

9600/V32
9600/
4800/V32
4800/
7200/V32
7200/
12000/V32
12000/
14400/V32
14400/

codes.

setting

modem

codes

results

control

at

any

rate

indicate

or

higher.

ARQ

ARQ

ARQ

ARQ

option

modems.

ARQ/V32

ARQ/V32

ARQ/V32

ARQ/V32

ARQ/V32
ARQ/HST

sub-

does

returns

are

is

if

the

from

the

is

If

-

-

-

-

-

-

-

-

-

-

-

&A3 Protocol codes

reported
under
the
ing a synchronous

If

the
compression,
code.

negotiated

5-6 Internal Controls

are: HST, LAPM,

one

of

those

result

code),

modems

In

the

first of

error

are

enabled.

protocols

the

modem

connection,

are

using

V42BIS

the

control for

Error

control protocols

or

MNP.

(and

reports

data

or

MNPS, is

following examples,

the

When

ARQ

either

or

NONE,

compression,

added

call (ARQ),

the

call is

is

not

included

SYNC, indicat-

for

no

protocol.

the

type

to

the

result

the

modems

used

HST

not

of

in

-

-

-

-

-

-

COURIER HIGH SPEED MODEMS

-

-

-

-

-

NOTE:
they

are

If

the

not

be

&A3

result

Result Code Sets

You

have

subset

Result

O/OK

I/CONNECT
2/RING
3

/NO
4/ERROR
5/CONNECT
6/NO

7

/BUSY

8/NOANSWER
9/RESERVED
10/CONNECT
11/RINGING
12/VOICE
13/CONNECT
18/CONNECT
20/CONNECT
21/CONNECT
25/CONNECT

43/CONNECT

modulation,
using

V.42

CONNECT 16800/
CONNECT 14400/
CONNECT 9600
CONNECT
CONNECT

Although

the

same

modem

able to differentiate

codes

(Xn)

eight

best

suited

Codes

CARRIER

DIAL TONE

are

using

bis

compression.

ARQ/HST
ARQ/V32/LAPM/V42BIS

/SYNC

2400/

ARQ/MNP

2400/NONE

these

numeric

is

in

Numeric

may

not

options, 0 through

to

your

1200

2400

9600
4800
7200
12000
14400
16800

HST

/HST

/MNPS

codes

will

identifiers

Mode

between

be

compatible

applications.

XO

Xl

X2

error

control protocol,

/V42BIS

return

(VO)

&A2

7, for selecting

[or

[or

[or

LAPM/V42BIS]

numeric

used

for &A2

and

set

and

with

Setting

X3 X4

MNPS]

MNP

to &A3,

&A3

some

XS

and

/MNPS]

identifiers,

result

codes.

you

result

codes.

software.

the

result

X6 X7

are

will

code

Functions

Adaptive
Wait for
Wait for Answer(@)
Fast Dial

Dialing

2nd

Dial Tone (W)

Table

5-1.

Result

Code

Options

Internal Controls 5-7

COURIER HIGH SPEED MODEMS

-

NOTE:
tion

Subsets (&An), earlier

Result

Code

0/0K

1/CONNECT

2/RING
3/NO

CARRIER

4/ERROR
5/CONNECT
6/NO

DIAL

TONE

7 /BUSY

8/NOANSWER

10/CONNECT

11/RINGING
12/VOICE

13/CONNECT

Adaptive
Wait

Dial Tone (W)

Wait

Answer(@)

Fast Dial

for

for

Dialing
Another

an

and

1200

2400

9600

Additional

the

modulation

Meaning
Command

Connection
may
connection is
Incoming
Carrier
disconnect
Command

Connection

Dial
Register S6
Busy signal detect;
After
returned

used
Connection
The

Voice
Connection
4800 (18), 7200 (20), 12K (21), 14.4K (25)
only).

The
doesn't
The

another
The
seconds
Chapter
The
of

waiting

Table

messages

for a call. See Additional Result

in

this chapter.

has

been

with

another

be

between

detect

tone

waiting 5 seconds

instead

modem

answer

modem

work,

modem

dial

modem

of

6.

modem

5-2.

300

at

300

ring

detected

has

failed

is invalid

with

another

not

detected

of

with

another

has

dialed;

at

remote

at

reported

attempts

reverts

continues

tone. See

continues

silence

the

Result

on

dials

immediately

normal 2 seconds

Code

indicate

executed

modem;

and

16.8 bps; if Xl

bps

or

modem

during

modem

for

NO

CARRIER

modem
remote
site;

rate.

to

use

to

rotary

dialing
the
dialing

the

line. See

Definitions

an

carrier

the

hangs
an

answer,

phone

modem

Same

Touch-Tone

dialing.

as

dial

options

when

on

error-control connec-

Code

if set to

has

at
normal

up

when

at

soon

the

dial-tone detect,

set

XO,

connection

or

higher,

been

dropped

1200

bps

2 seconds,

modem

the

@option

2400

bps

line is

hangs

meaning

it detects 5

in Register S6.

ringing

up

for

and

16.8K (43, HST

dialing

as it detects

in

Chapter

dial

options

set

hangs

results

and,

6.
in

instead

due

up;
is

if

in

of

that

to

-

-

-

-

-

-

-

-

-

-

-

5-8 Internal Controls

-

-

-

-

-

LOCAL ECHO

COURIER HIGH SPEED MODEMS

-

Local echo is
data

the

controls

is

in

Command

modem

Command Mode Local Echo

The

En

commands.
modem's

The

Courier

echo.

The
session,
reset,

the

The

En

power-on/
EO

El

Online Local Echo

This

command

transmitting

is
return a copy
the

modem's

double

some

In
applied
cally accurate.

the
Courier
the

display

Mode.

is

online

command

If

double

local

echo

is

shipped

En

command

independently

modem

command

reset default.

Command
keyboard

Command

(Fn)

causes

to

of

online

characters

microcomputer

to local

online

display

transmits

to

enables I disables

operates

is

Mode

commands.

Mode

another

received

appear

of

of

your

The

another

(En)

characters

and

your

with

controls

of

the

not

stored

echo OFF. The

echo

the

modem

system.

data,

echo is

on

documentation,

echoing,

what

to

another

typed

Fn

system.

software's

DIP

switch

according

ON.

ON

the

you

type

modem.

commands,

command

the

appear

switch
the

local echo for a

setting.

to

in

nonvolatile

to

display a copy

Many

which

is called a

and

there

screen.

although

at

the

applies

display

on

the

local

4 OFF,

At

the

DIP

memory

modem

systems,

is also

the

term

the

term

keyboard

The

En

when

to

of

your

screen,

echo

are

enabling

power-on

switch

does

however,

remote

remote

duplex is

is

command

the

modem

when

typed

both

on.

local

current

setting.

as

a

not

display

of

the

echo.

echoing,

not

techni-

and

the

the

and

data

it

If

-

FO

Fl

Online
modem
copy

of

Online

echo

ON.

transmits

the

data

echo OFF.

Sometimes called half duplex.

data

to a

to

the

screen.

Sometimes

remote

system,

called full duplex. Default.

Internal Controls 5-9

As

it also

the

sends

a

COURIER HIGH SPEED MODEMS

-

THE AUDIO MONITOR

The

modem's
process. There
After the
pitched
lowed
before a

At
line is
your
can
time

For example, if
pick
person.
keyboard. In
a

busy

You can also
system.
command,
have

Courier

answer

by

data

data

the default

busy,

screen after

respond

out.

up

the

Or

signal.

Terminate

but

the

modem

speaker

are

signals, called a carrier. These signals

link

Xl

the

immediately

you
phone,
you

the

hear

insert a comma(,)

enables

several

dials a

tone

from

is established.

setting, if

modem

60

seconds.

hear

if

it's

can cancel the call

same

way,

if

dialing is

the

call (press

pause

you

ways

number,

the

other

someone

sends

If

instead

someone

attached

you

proceeding

during

the

you

the

to

monitor

to

make

use

of this feature.

it

waits

60

seconds

modem,

answers

message

listen to the speaker,

of

waiting

answering

to

the

by

pressing

can

cancel a call

any

key)

or a couple

dialing

immediately

NO

for the

modem,

too quickly for the

and

of

process.

the

dial-connect

for a high-

must

the

phone,

CARRIER to

modem

the

call,

you

and

talk to

any

key

when

retype

the

slashes(/),

or

you

on

you

fol-

occur

if

to

can

the

the

hear

Dial

to

-

-

-

the

-

-

-

-

-

SPEAKER CONTROL

This

command

to

monitor

MO

Ml

M2

M3

5-10 Internal Controls

different

This setting disables

hear
The

speaker
monitor
modem's
and

result

disconnects

suppressed.

The

speaker
transmission.

The

speaker
dialed,

(Mn)

disables

segments

the

modem

is

call

progress

carrier signals,

code

the

is

doesn't

then

goes OFF

the

speaker

of

the

speaker

go

off hook, dial, etc.

ON

until

Carrier

until

or
display.
speaker

ON

At

and

continuously,

go

ON

at

Carrier

entirely

the dial-connect sequence.

the

until

Carrier

data

until

or

sets

the

speaker

entirely so

Detect. Default. You

Courier

the

60-second

Detect,

transmission

including

after the last digit is

Detect.

that

detects

the

during

you

the

timeout
modem
sounds

remote

data

-

-

don't

-

can

-

are

-

-

-

-

-

COURIER HIGH SPEED MODEMS

-

-

MODEM CLOCK USAGE

The

modem

time

clock.

the

modem

minutes,

KO

Call-Duration
from

mation

reset.
duration.
printing

K1

TRANSMITTER ENABLE/DISABLE (Cn)

Real-Time
regardless
military time)
seconds
at

At
set
clock is

(Kn)

clock is
Used
returns

and

seconds

CONNECT

At

the

real

ATl3=13:30:00

ATI3,

the

used

in

conjunction

the

Mode.

until

the

A Tl3 <Enter>,

If

you

this

information

Mode.
of

the

by

as

in

the

time

the

modem

clock

each

not

affected

as a call-duration

duration

or

the

to

NO

next

wish,

The

presence

specifying
following

of

1:30 p.m.

K1

displays

time

by

with

the

of

the

last call

actual

time.

Default. The

CARRIER,

connection

the

modem

you

can

maintain

after

each

clock

operates

of a carrier. Set

the

hour,

example,

<Enter>

the

you

power

the

reset

command,

timer

or

as

In (Inquiry)

modem

and

stores

or

when

displays

call.

as

minutes,

which

real time. You'll

on

the

command,

in

hours,

times

the

the

modem

the

a call

log

a real-time clock

the

clock (in

and

sets

modem,

A TZ.

a real-

each

infor-

call's

by

the

clock

need

but

call

is

to

the

-

-

-

If

an

additional
monitoring
Only

state

1200

or

300 bps.
CO
C1

BREAK HANDLING

This
without
options

&

Transmitter
Transmitter

command

YO

Destructive,
data
transmit

terminal

purposes,

by

disabling

disabled.
enabled. Default.

(&

Yn)

allows

disconnecting

are

available.

no

from

its

transmit

the

Break to

and

the

second

its

transmitter.

you

to

from

Break

modem

Modem

send a break

the

transmitted:

buffer

the

share

modem

is

phone

(all

remote

the

phone

is

placed

Use

this feature

set

to Receive Only.

to

abort

link.

The

the

modem

data

is lost)

modem.

Internal Controls 5-11

line for

in

Receive

only

data

transfer

following

clears

but

does

at

the

not

COURIER HIGH SPEED MODEMS

-

&

Yl

&Y2

&Y3

NOTE:
Breaks
tables.
tables,

S-REGISTERS

The S-Registers
redefinition

options. The

A

detailed

A less

Destructive, expedited:
immediately
Default.

Nondestructive,

transmit
remote

Nondestructive,
the

modem

Break,

input

from

If

the

cause

When

and

the

of

summary

detailed

sends

a Break to

expedited:

buffer,

modem.

sends

call is

both

transmission

result

are

selected ASCII characters,

defaults

summary

but

unexpedited

transmits

the

Break,

the

DTE.

under

modems

is

lower

used

to set

reflect typical

of

the

is

immediately

MNP5

to reset

resumes,

S-register functions is

in

the

modem

the

any

buffer

and

then

data

their

than

normal

various

the

Quick-Reference card.

clears

the

remote

modem

sends

(send Break

data

received before

sends

compression,

data

the

modems

throughput.

timing

and

requirements.

the

buffer

modem.

retains

a Break to

any

compression

parameters,

other

data

the

in

sequence):

subsequent

destructive

build

new

configuration

in

Appendix

and

in

the

-

-

the

-

-

-

-

-

-

B.

-

5-12 Internal Controls

-

-

-

-

-

-

-

COURIER HIGH SPEED MODEMS

-

-

-

CHAPTER 6. ASYNCHRONOUS DIALING AND ANSWERING

The

information

only.

For

synchronous

BEFORE CONNECTING

For

two

modems

the

same

modulation
successful,
devices (the
length,

Modulation/Standards

The

Courier

signaling

USR-HST

CCITT V.32

CCITTV.32

V.22
Bell
CCITTV.22
CCITTV.23

CCITTV.25

Bell 103
CCITTV.21
CCITT V.42
CCITT V.42
MNP

CCITTV.54

the

computers,

parity,

modem

standards.

bis

212A/

or

in

this

chapter
operations, refer to

to connect

standard

same

error

or

and

number

adheres

14.4K/12K/9600/7200/

16.8K,
Standard

bis

14.4K/12K/9600/7200/4800
Standard

9600 I 4800
modems)

2400

bps

1200

bps

1200

bps

phone
Answer

the
300

LAPM

bis

Data
Levels

compression,
Analog

testing

system)

U.S.

bps

error

compression,

2, 3 and 4 error

applies

and

exchange

and,

for

control protocol.

DTEs)

must

of

stop

bit

to

the

following

and

HST

and

V.32

bps

(Dual

with

75

bps

sequence
and

digital

for calls

Canada

control, 1200

1200

and

to

asynchronous

Chapter

data,

error

control to

The

use

the

settings.

modulation

modems)

bis

modems)

Standard

back

channel

originating

bps

1200

bps

and

control, level 5

bps

and

higher

remote

digital

7.

they

must

end-to-end

same

word

4800

bps

bps

(Dual

and

V .32

(British

and

higher

higher

loopback

calls

use

be

and

(Dual

bis

outside

data

Asynchronous Operations

6-1

COURIER HIGH SPEED MODEMS

-

Setting the Transmission Rate

Setting

ensures
modem
accordingly.

the

Follow the guidelines in the Quick Start

detailed instructions

or

software to a
Set the

We

setting,

fixed link rate.
negotiate
rate.

Data Format

The

data
The following table lists
Stop

your

terminal

that

the

Courier

detects

data

formats

fixed DTE rates (&Bn). Setting the

modem

recommend

&NO,

Courier

format.

bits.

the

It

also detects

shown

high

for flow control (&Hn), as well.

leaving the

unless

&NO

with

the

and

the

One

Start bit is

Word

Length

7

7
8

or

software to 57.6K, 38.4K
can

operate

rate

from

the

AT

your

terminal/software

below

in

Chapter

DTE rate will give

your

allows the

remote

remote

Even,

Mark, Space

in

Table 6.1.

4 before selecting either variable

modem

application requires

Courier

modem

the

Parity

(1

None
None

for

modem

universal

allowable

Bit)

Odd

at

its

highest

command

in

modem

you

at

its

to automatically

the

must

and

word

and

Chapter 3 or

to &Bl

the

best

link

operation

that

highest

use

the

not

programmable.

lengths,

Stop

Bits

1

2

1

or

19.2K

bps

speed.

throughput.

possible

same

The

operates

settings for

the

and

your

factory

you

specify a

link

ten-bit

parity

-

-

-

more

-

-

-

-

-

and

-

-

-

Table

6.1-Allowable

Error Control

For reliable

error
bps.

Most

modems

6-2 Asynchronous Operations

high

speed

control, &M4 (the default)

users

communicating

will

want

error

data

control

Data

transfer,

or

&MS, for calls

with

at

2400

Formats

always

V.42-

and

set

the

Courier

above

2400

or

MNP-compatible

1200

bps

as well.

-

-

for

-

-

-

It

is a

compatible.

If

the
misinterpret
connection.
MNP,
The

modem

PLACING CALLS

The

commands

ing

operations:

good

idea

remote

disable

to find

Some

modem

the

error

If

you

MNP

still connects

discussed

out

public

doesn't

control

know

handshaking

COURIER HIGH SPEED MODEMS

if

the

remote

network

have

request

the

remote

by

with

V.42-compatible

in

this section

modem

services, for

MNP

capability,

and

block a successful

modem

setting

doesn't

Register 527

are

used

is

MNP-

example,

it

may

support

modems.

in

the

follow-

are

to

not.

16.

-

-

-

Dial

(D)

When
hook-the
Originate

The

included
The

modem
parentheses

fix

command.
The following

the
the
using
the

Cancel Dialing

Dialing D (0-9

of

dials

may

ignores

Return

and

dial (D)

dialing

only

MO

OT

A/,

<any

is

picking

the
any
line.

include

(Enter key)

example

(EO,

(T). The

included

1234567 <Enter>

Redialing
Canceling

the

Dial

equivalent

mode

modem

in

command

counts,

or

the

Carriage

display
speaker

Touch-Tone

modem

AT

dialing

command

and

also executes

the

command

string

but

and

hyphens.

command

of

commands

(MO),

and

are

EO

#*,;!PT

A>, >

key>

issued

punctuation

It

up

number

other

up

does

not

instructs

turn

the

phone

here

the

your

commands

off

spaces

W @R), DSn

modem

sequence

to 40 characters. The

count

required

the

for readability.

goes off

phone-then

that

or

characters

spaces,

to execute

the

modem

local echo),

number

shown

(1234567)
are

enters

follows.

options

such

as

the

AT

to

turn

ignored

pre-

the

stop

off

by

-

-

To cancel
inadvertently

dialing,
explained

Dial-command

the

call is canceled.

under

hit a key

Redialing

execution,

on

the

If

later

press

<any

key>.

If

you

keyboard

this occurs,

in

Asynchronous Operations 6-3

while

type

this chapter.

the

the

modem

A/

command

is

COURIER HIGH SPEED MODEMS

-

Dialing

Adaptive Dialing

Type,

Pulse or Tone

If

set

To

have

(*)

and

be

included

example,

The following

You
sequence.

NOTE: The
call

until

type

When
not

issue a
dialing,
the

phone
detection
ues

to detect

cally

to

XO

or

the

modem

pound

in

or

issued

ATT <Enter>

ATP <Enter>

can

switch

modem

it is reset (ATZ

command.

(X2-X7)

any

of

the

dialing

which

company's

equipment,

the

reverts

to

Xl,

the

modem

use

sign(#),

the

Dial string,

separately:

command

from

one

remains

X2

through

type

is faster

dial

tone.

pulse

dialing. _

defaults

tone

dialing,

use

the T command.

as

in

resets

the

dial

type

set to

command)

X7

options

in

the Dial string,

than

the

default
central office
the

modem

If

this occurs,

to

which

the

previous

modem

to

another

the

dialing

or

it

does

cannot

pulse

(rotary) dialing.

includes

The

to

pulse

within a dialing

receives a different dial-

is

in

effect

the

Courier

pulse

type.

not

have

break

the

modem

the

asterisk

command

command

dialing:

type

of

and

However,

Touch-Tone _

dial

and

automati-

may

the

last -

you

do

uses

tone

contin-

-

-

-

-

-

-

if

Pause(,)

A

comma

following

The first four-second
dialing
what
tem
delay

Such
use

6-4 Asynchronous Operations

causes a
example

ATOP 9,,7654321,,55555,,13121234567 <Enter>

9,

but

you

follows. The

is

ready

for

before

pauses,

delays

dialing

however,

only

two-second

contains four-second

may

second

the

as

required.

pause

wish

pause

user's

account

the

long-distance

may

delay

in

is to access

to

use

the W option,

is to

number,

not

be

necessary.

the

dial sequence. The

delays

an

make

number.

at

outside

sure

the

and

the

Experiment

described

several points:

line after

in

remote

third, to

sys-

and

-

-

-

-

-

-

-

-

Slash(!)

A

slash(/)
modem
helpful

than

Wait for Another Dial Tone

This

second
need
Courier

can

pause

to

have

the

2-second

command

dial

tone

to

dial

for

continues

ATD9W1234567 <Enter>

be

for

the

(W)

is

before

an

used

in

any

only

125 milliseconds.

shorter

comma

useful

outside

dialing

delay

pause.

in

situations

continuing

line,

as

COURIER HIGH SPEED MODEMS

command

of a series

as

soon

as it

where

dialing.

in

the

detects

string

to

Some

users

of

slashes,

you

must

For

example,

following

the

have

the

find it

rather

wait

example,

next

dial

for a

if

tone.

you

the

-

-

-

NOTE: This

greater

modem

Dial and Return

If

your
option
modem.
message,

For example, to
command

When
receiver so

mand

Similarly,

the

modem

speaker

Dialing Letters ('J

command

has

been

issued.

interprets

to

Command Mode

phone

to

have

The

indicating

with

ATDT5551234; <Enter>

the

modem

you

that

hangs

ATH <Enter>

you

and,

the

Was a comma

is

plugged

the

modem

Courier

can

Dial, listen to

when

dials,

it is

have

the

a semicolon:

returns

can

talk to

up

the

call a

you

executes

If

the

modem

(;)

into

the

Auto

remains

in

Command

modem

the

OK

the

other

modem:

recorded

the

recording

are

finished, tell

only

if

result

code

is set to

(two-second pause).

modem,

Dial a

telephone

off

hook

mode.

place a voice call,

result,

party,

weather

over

you

pick

and

or

the

X2

can

and

up

send

other

the

modem

option

or

lower,

use

this

rather

than

returns

enter

your

phone

the

com-

service.

modem's

to

hang

X3

the

the

or

the

a
OK

Dial

Have

up.

-

Quotation
and
USRobotics Sales

marks

acronyms

used

are

used

to

have

as

phone

Department's

the

modem

numbers,

800

such

number).

Asynchronous Operations 6-5

dial

abbreviations

as

DIAL USR (the

The

option

is

COURIER HIGH SPEED MODEMS

called

Quote

ning

of

the

mode.

alphabetic

Quotation

string:

marks

are

inserted

at

the

begin-

-

-

ATDT"BBS NEWS <Enter>

NOTE:

string,
command.

Transferring Calls

This

modems
hook, i.e., goes off
off
example
and

Wait for an Answer (@)

Some
recorded
In
to tell
of
cute

To
modem
message
string.
voice

If

use

(!)

command

hook

to

hang

online

such

instances,

the

silence

the

Dial string.

use

the@

is set to

If

answer

you

closing

share

again
includes

ATDT !1234;H <Enter>

request

modem

at

when

set to

are

including
quotation

applies

the

phone

hook

to

dial

instructions

up

(H).

services

the

command,

and

answer

for

information
the @ command
to detect

other

X2

or

encountering

XS

or

X6,

sends

another

marks

to

modems

line.

0.5 seconds,

the

specified extension. The following

the

at

least

end

of

the

set

the

lower,

the

the

the
the@

modem

VOICE

before

in

The

modem

to

return

phone

before

can

one

call,

modem

modem

character

command

the

installations

flashes

on

hook

to

Command

and

return a tape-

processing

be

used

ring,

wait

and

then

to

X3,

returns

in a command

hangs

up

result

code.

after

additional

where

the

for 0.5 seconds,

in

the

for five

continue

X4

or

an

when

the

dial

other

switch-

and

mode

(;)

transactions.

Dial

string

seconds

to exe-

X7.

If

the

ERROR

it detects a

-

-

-

-

-

-

-

-

-

-

In

the

next

example,
option
example
requests
ber
indicate, for example, a

If

ing

6-6 Asynchronous Operations

(6789)

the

necessary

five

and

dials a

indicates a five-second

from

and a transaction

ATX4 DT5551234@ 12345

seconds

banking

the

bank

conditions

of

silence-the

the

modem

for a

request

is set to

service. Each occurrence

wait

for silence,

password

code

(2).

The

for

an

do

not

occur-no

modem

the

X4

(12345),

transaction

account

@6789@

rings,

times

result

that

an

account

balance.

2 <Enter>

or

out

as

it

code

of@

in

is, for

code

no

follow-

normally

the

taped

num-

might

-

-

-

-

-

COURIER HIGH SPEED MODEMS

-

would
ANSWER to

Reversing Originate/Answer Frequencies

This
reverses
Courier
lows

Dialing a Stored Number (DSn)

Chapter 5 includes
numbers
have
where
the
assumed

You
number
codes for different extensions. Store
you
dial
want,
at
only

(after 60 seconds). It

the

screen

command

to dial

the

the

n is

next

two

can

store a partial

of

don't

the

number;

as

position

for readability.

allows

the

modem's

out

Dial

command,

AT D1234567R <Enter>
AT DR1234567 <Enter>

in

nonvolatile

modem

the

number's

examples,

by

the

modem

ATOS <Enter>
ATDS3 <Enter>

a system, to

have

to

in

the

following example.

1.

Spaces

and

aborts

calls to

originate/

at

the

answer

before

instructions

random

dial a stored

position, 0-3,

the

phone

if

there

dial

sequence, for

which

type

it

each

then

have

the

in

the

command

then

sends

the

the

command.

(R)

an

originate-only

answer

frequency.

or

after

the

for

storing

access

memory

number

you

time.

modem

number

is

no

might

The

use

in

numeric

the

Use

dial

phone

string

message

frequencies, forcing

The

phone

up

the

NVRAM.

is

stored

example,
want

phone

the

DSn

whichever

are

NO

modem.

command

number:

to

four

telephone

(NVRAM).

DSn

command,
In

the

at

position

parameter:

the

phone

to

add

different

number

command

code

number

included

is

It

first of

so

that

stored

here

the

fol-

To

0,

to

you

-

-

-

REDIALING

The
The

AT

most

frequent

Courier

OS 1 05678

reason

provides

three

<Enter>

for

redialing

ways

is receipt of a

to redial,

Asynchronous Operations 6-7

as

follows.

busy

signal.

COURIER HIGH SPEED MODEMS

-

Dial the Last Dialed Number

When

sent

number,

To
following

To

n is

last

If

a

written

Re-execute the Last Command

The
riage Return, redials

When

in

Note

since

of

which

ATDL

display

command:

ATDL?

write

the

the

position

dialed

number

with

A/

command,

A/

the

modem

its

command
that

if

the

Dial

redialing.

the

number

&Z3 = L

this

command,

it

has

number

last

number

in

is

already

the

last-dialed

buffer

you've

command,

(DL)

NVRAM. The following

receives a

sent

stored

stored

at

position

stored

(A/,)

which

one

until

the

the

modem

in

a special buffer:

in

the

dialed

time:

A/

to NVRAM,

3:

at

position

number.

does

not

command,

it receives

modem

re-executes

dials

the

last

last-dialed buffer,

use

&Zn=

example

3,

that

number

take

the

AT prefix

it

stores

the

the

next

AT

an

additional

that

command

command

dialed

use

the

L

where

stores

the

is over-

or a Car-

instruction

command.

instead

-

-

-

-

-

-

-

-

-

-

Automated Redialing(>, A>)

These

two

commands,

repeat

any

command,

first (>) is

used

buffer.

6-8 Asynchronous Operations

included

alone to

in

continuously

while

are

designed

the

Dial

they

command.

redial

can

be

for

the

command

used

to

automated

The

second

string

continuously

redialing. The

(A>) is

in

the

-

-

-

-

-

-

-

Continuous Repeat(>)

If

you

know

include

The
default
second

the

modem

60

seconds

pause,

the

Repeat

AT>
AT

OT

enters

it redials.

modem

OT

you

are

command

1234567 <Enter>

1234567

Repeat

for a carrier,

><Enter>

mode,

COURIER HIGH SPEED MODEMS

calling is

in

the

dials

and

frequently

Dial string,

the

number,

hangs

up.

as

follows:

waits

Then,

busy,

the

after a two-

-

-

The cycle
reaches a
by

the
vent
nected

Continuous Re-execute

This
commands.
above,
the
Return:

Exiting Repeat Mode

Should

string,

abort

To
the

begins

dialing,

continues

maximum

Canadian

tying

calls.

command

and

A/

command,

you

abort

automated

result

code

dialing

that

up

A>

Department

local

(A>)

combines

The

modem

redials

use > or

the

cycle

appears,

again.

dial

attempt

until

the

of

10

attempts.

telephone

the

enters

the

Dial

string

A>

does

not

A>

with a command

by

pressing

redialing,

during

If

you

is canceled

modems

of
company

features

take

be

press

connect

The 10-try limit is

Communications

exchanges

of

both

Repeat

the

in

the
the

<any

sure

pause

<any

mode

command
AT prefix

key>.

to

key>

but

or

the

(DOC) to

with

the

A/

as

described

buffer. Like

or a Carriage

other

than

press

<any

before

the

the

while

the

cycle continues.

modem

mandated

uncon-

and>

a Dial

key>

when

modem

modem

pre-

is

-

ESCAPE CODE OPERATIONS(+++)

Once

the

modem

it recognizes is

the

modem

issuing

the

is

online

an

escape

back

to

Command

command:

code

to

another

of

system,

three

typed

mode.

Do

Asynchronous Operations 6-9

the

pluses,

the

following

only

command

which

when

forces

COURIER HIGH SPEED MODEMS

-

• Wait

•

• Wait

Do

not

of

one

from

misinterpreting

data

stream.

NOTE:
modem
described

If

necessary, the character

tion of the
S12. See the S-Register Summary in

Modem Response

The

modem
escape code.
depending

DIP Switch 9 Response to +++
OFF

ON

The factory setting (OFF) forces
you

issue+++.
inadvertently

Set DIP switch 9
by

entering

commands

one

second

Type:+++

one

second

type

the AT prefix

second

before

If

you've

will also recognize a software

in

guard

to

+++

previously

Chapter 4 and

time

returns

However,

on

the setting

Modem
CARRIER
Modem
mode),

An

run

up

ON

Online-Command

and

return

after

sending

before

and

the

can

to

Command

it keeps

goes

maintains

sends

advantage

an

all-night

if

you

online. (See the 0

typing

or a Carriage

after

the

occurrence of +++

issued

Appendix

used

in

be

changed

the

of

DIP

switch

on

hook

result

code

OK

an

of

want

the

mode,

result

the last

any

data

Return.

code

prevents

in

the

&Dl

DIR

toggle.

C.

the

escape

by

resetting Register S2

Appendix

mode

when

line

open

9:

(hangs up),

(factory setting)

connection

code

automatic

this is

that

phone

bill.

modem

enabling

command,

item

of

data

The

guard

time

the

modem

the

transmitted

command,

code

B.

it detects the

or

hangs

(Online-Command

disconnect

you

are

to

respond

it

to execute

&Dl

or

the

sends

not

below.)

the

is

dura-

up,

NO

when

likely to

to +++

-

-

-

-,

-

or

-

-

-

-

-

-

-

WARNING:
the

modem

If

you

are
tended
dropping
onds,

to

ing

the

tions

port-differ

6-1

O Asynchronous Operations

For

may

running

operations,

the

DIR

ensure

DIR

signal

unattended

fail to recognize

the

we

signal from

against

off-for

from

modem

modem

suggest

costly

example, closing

one

computer

the+++

under

you

the

DTE for

phone

operations:

escape

software

use

the

surefire
at

charges.

to another.

in

rare

code

control for

method

least

50

Methods

the

communica-

instances,

sequence.

unat-

of

millisec-

of

turn-

-

-

-

-

COURIER HIGH SPEED MODEMS

RETURNING ONLINE (0)

If

DIP

switch
modem
then

toggle the

this example:

There

I

.-

are

ATOO

9 is

maintains

AT

three

Return

ON

(on detection

the

connection),

modem

01

ways

online (normal). (Used

back

0 <Enter>

to

return

online

online.

of

you

with

the

escape

can issue

the 0 command,

in

the

code

commands

example

the

as

above.)

and
in

-

-

ATOl

AT02

HANGING UP

If

modem
want
the

If

receipt of the escape code.

AUTOMATIC ANSWERING

The
suppressed.
ing

1.

Return
non-ARQ

Return
down
may

and

(Hn)

DIP

switch

the

modem

DIP

switch

Courier

calls,

Before
When
incoming

online

online, initiate a 2400

to 1200 bps.

be

used

AT01

9 is

back

to

modem

sends

ATH <Enter>

9 is OFF,

is

shipped

To set the

do

one

powering

you

turn

calls

and

data

transfer.

if

the

didn't

work.

ON

(factory setting),

Command

to

hang

the

OK

the

with

modem

of

the

following:

on

your

the

computer

on

the

retrain. Use if

bps

Applies

remote

mode

up,

result code.

modem

first ring.

only

modem

Used

mainly

but

leaves the line

issue

the

automatically

DIP

switch 5 ON,

to

automatically

system, set DIP

on,

the

there

were

speed

shift,

to calls

is a V.22

for testing

the

escape

following

Auto

switch

modem

errors

and

at

2400

bis

modem

code

open.

command

hangs

Answer

answer

5 OFF.

answers

in

a

drop

bps,

and

purposes.

forces

the

If

you

once

up

on

incom-

2.

When
command
(You
summary

the

modem

instructs

can

substitute a higher

in

is on,

Appendix

the

use

software control. The following

modem

B.)

to

answer

value. See the S-Register

Asynchronous Operations 6-11

on

the

first ring.

COURIER HIGH SPEED MODEMS

-

ATS0=1 <Enter>

When

the

modem

code

RING

to
modem a high-pitched
within
made,

is

and

Suppressing Auto Answer

To
switch 5 ON
to

Points to Remember

1.

2.

INTERNATIONAL CALLS

60

seconds,

the

modem

disconnected

returns

disable

answer

If

modem
Load
and
software's
and/

If

ventional
expecting
answer
a

the

Auto

before

on

zero

ATSO=O

the

modem

to

your

set

the

or

files.

you've

high-pitched,

attached

the

calls,

senses

your

sends a CONNECT
by
NO

Answer,

rings:

is

receive

communications

modem

file-save

incoming

phone

a call

screen,

the

you

CARRIER code.

powering

<Enter>

disable

irritating

goes

answer

modem

or

the

reverse

attached

calls

to

Auto

function

your

data

before

when

phone

Auto

coming

off

tone.

hangs

remote

on

to a computer,

software

Answer.

calls.

you

answer

in,

it

hook,

and

If

there

up.

If

result

user,

Steps 1 or 2 above.
the

modem

you're

to

Answer

do,

not

as
Also

save

incoming

so

it

can

when

Otherwise,

greeting a voice

tone.

sends

sends

is

no

the

connection

code.

the

modem

or

you
at

your

you

set

be

used

you

your

the

result

the

Carrier

When

hangs

Set

set

the

can

set

computer.

normally

your

messages

for con-

are

modem

caller

remote

Detect

is

the

DIP

modem

the

do,

not

may

with

call

up

-

-

-

-,

_,

-

-

-

-

-

-

There

are

three

commands

1200

bps

and

above.

NOTE:
modem

Handshaking Options

This
operation.
setting,

6-12 Asynchronous Operations

To

call

to

CCITT V.21

(Bn)

command

However,

as

described

or

answer

is

used

in

that

overseas

mode.

primarily

to

answer

the

following.

apply

to

modems

See

Register

to

select

international

international

at

300

bps,

S27

in

Appendix

HST

or

V.32

calls,

use

calls

set

bis

the

at

the

B.

BO

-

-

-

-

-

-

-

BO

Bl

Guard Tone (&Gn)

This

setting
British
1800

Hz
European
tones

are

This

setting
also selects
North
V.32/V.32

This

setting
Dual

Standard

that

the

Set

Courier
international
dem's
slightly longer,

This

setting

the

Bell 2225

This is

applies

phone

guard

phone

not

is

the

America. This

bis

is

modem

HST

calls.

ability to call

is

Hz

the

default

only

switching

tone

after

networks

used

in

COURIER HIGH SPEED MODEMS

required

CCITT V.25

recommendations.

the

modems.

is set for

however,

required

the

for V.32/V.32

answer

default

modems

The

or

answer

for HST

answer

setting

to

overseas

systems

it

sends

require

United

answer

tone

for

the

All

you

Auto

Answer

to

BO

BO

setting

domestic

to connect.

tone

used

for

the

calls

require

an

answer

a 550

States

bis

tone

used

is

incorporated

Courier

need

to

(ATSO=l).

to

answer

does

not

modems.

operation.

in

the

Courier

at

2400

the

modem
tone.

Hz

guard

or

Canada.

operation.

outside

into

V.32

bis

and

do

is

make

HST-mode

affect

the

It takes

It also selects

U.S.

and

Canada.

HST.

or

1200

bps.

to

send

Some

other

tone.

Guard

It

of

the

sure

mo-

an

-

&GO

No

guard

tone,

U.S./Canada.

&Gl

550

Hz

guard

tone

&G2 1800

Pulse Dial Make/Break Ratio (&Pn)

This

command
break)
use

in

is

used

countries.
&PO
&Pl

Hz

guard
Kingdom
BO

setting.

interval

North

in

Make/break
Make/break

Commonwealth

America.

the

United

and

sets

for

the

pulse

ratio,
ratio,

tone

some

Kingdom

Default.

follows

follows

Commonwealth

ratio

dialing. The

The

U.S./Canada:
United

countries: 33% I 67%.

answer

answer

of

the

ratio

must

and

Kingdom,

Asynchronous Operations 6-13

tone.

tone,

off-hook/

default

be

changed

some

Commonwealth

39%/61

United

countries. Requires

on-hook

sets

some

the

if

%.

(make/

modem

the

modem

Default.

for

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

OVERVIEW

CHAPTER

COURIER HIGH SPEED MODEMS

7.

SYNCHRONOUS OPERATIONS

-

-

-

Synchronous
receive calls from, a Host
is

usually a mainframe.

terminal,
NOTE: The

Terminal
communications.
the

remote

Data Rate Synchronization

During

both

ends

flow.

The
modem
all

handle

Protocol Compatibility

The devices

protocol. These devices
which

is

Courier's
The

link

trol),

HDLC
Synchronous
mainframe
blocks
error

or

control.

mode

even

if

it

is a

term

DTE

Equipment,

DTE

computer.

synchronous

of

the

phone

communications

and

network

the

data

at

at

both

transparent

V.42

and

MNP

protocol

frames,

may

(High-Level

Control)

manufacturer.

add

is

required

computer

The

powerful

in

the

the

end-to-end

denotes

operations,

link

control

equipment

software)

the

same

ends

of

the

are

exclusive

during

synchronous

error

be

SDLC

Data

or

another

These protocols

control

for

users

who

need

to call,

of a

large

network.

user's

device is

personal

following

equipment

your

terminal

transmit

the

and

your

speed.

link

must

control capabilities

(Synchronous

Link Control), BISYNC (Binary

protocol

information,

often

computer.

discussion

or

and

receive clocks

precise

at

of

timing

the

remote

modem

also

use

the

Courier

communications.

Data

determined

format

and

usually

The

called a

means
involved
computer

of

the

DTE (the

and

DTE

the

same

modem,

are

not

Link

Con-

by

the

data

provide

or

Host

Data

in

data

and

at

data

must

The

used.

the

into

-

-

REQUIREMENTS

Courier
tions

of
connections to a
operating
personal
probably

modems

remote

asynchronous

parameters.

computer)

need

only

in

asynchronous

mainframe

If

you

designed

set

the

mode

modems.

require

Courier

strict

are

operating a terminal

for a

particular

properly

Synchronous Operations

adapt

to

But

synchronous

adherence

network,

before calling

many

to specific

(not a

you

condi-

or

7-1

COURIER HIGH SPEED MODEMS

-

What

answering.

must

setting the

You

Need

The

information

If

you

have a personal

find

out

what

Courier

to

Know

network's

on

• The protocol

•

The

software

example, a specific

board

• The
answering

•

Whether
modem's
delay.
connection, it
after receiving
responding

If

it's necessary to

delay,

Summary

•

Any

for

communications

the

following requirements:

phone

number,

you

Request to

Once

you

need

in

restrictions

computer,

hardware

synchronous

needed

support

need

the

waits

an

with

Appendix

and

software

calls.

management

for

your

calls

needed

communications

if

you

to

change

Send/Clear

Courier

10 milliseconds (the

RTS

signal from

a CTS signal.

change

to reset Register S26. See

B.

about

when

to log into

will

the

establishes a

the

duration

you

you

be

calling

duration
to

Send

the

can

however,

need

before

staff can

package

synchronous

DTE before

of

call

supply

the

network,

or

instead

of

the

(RTS/CTS)

default

the RTS/CTS

the

S-Register

you

for

interface

of

value)

-

-

-

-

-

-

-

-

-

The

RS-232 Interface

Transmit

the RS-232 interface. You'll

Transmitter

(pin 15)
need
interface

implement

the RS-232 Interface,

The

Synchronous Adapter Card

As a rule,

communications. You will

7-2 Synchronous Operations

and

Receive

timing

or

the DTE (pin

pin

17, for Receiver

adapter

these pins.

personal

card, described below, the

synchronous

need

signals,

in

computers

depending

24)

generates the signals. You'll also

timing

If

you're

Appendix

probably

timing

either

signals.

building

B.

do

not

pin

on

whether

If

your

support

have

to

pins

are

required

15

or

pin

the

you're

using

adapter

own

cable,

synchronous

purchase

24 for

modem

an

will

and

-

at

-

-

review

-

-

install

-

-

-

-

a

synchronous

boards

SETTING THE MODEM

Once

commands.
work,
while

that

• A

•

One
which
purchase

•

Additional
to
using
also
mainframe

the

modem

use

it is still

provide

synchronous

identify

the

adapter

the

or

more

protocol

an

software

the

to

the

mainframe

have

to specify

resources

is

in

Before

attempting

following

in

asynchronous

COURIER HIGH SPEED MODEMS

card. These

following functions:

port

from

synchronous

the

Host

adapter.

functions.

type

of

your

synchronous

instructions

cards

the

protocols. Be

mainframe

computer

software. You will

application,

you

want

mode

to

connect

mode.

are

multifunction

DTE to

to configure

the

requires

For

example,

or

terminal

that

to use.

it

no

longer

in a synchronous

modem.

sure

to find

before

you

you

most

is,

identify

recognizes

the

modem

out

you

need

are

likely

the

net-

-

-

NOTE: Be

Data

Terminal

Courier
To

to
Commands
required

<Enter>.
to

Modulation/Link Rate

Use

V.32

USRobotics V .32
variable
possible rate.

If

Courier

detects

set

the

the

modem

synchronous

the

following

bis

modems:

link

the

Courier

to

sure

that

Ready

when

modem,

that

begin

Carriage

For

example,

mode:

AT

&M1

(Bn,

&Nn)

rate,

V.32

BO

and

DIP

switch

(DTR)

override

the

DTE raises

follow

are
with a required
Return,

guidelines

If

bis

&NO.

bis

try a variable

in

Chapter

the

<Enter>

the

modem

modem,

The

is to

the

instructions

which

following

for

set

modems

connect

1 is OFF (factory setting).

must

be

OFF

so

that

and

2,

Testing

AT prefix

we

denote

command

your

Courier

is

connecting

both

modems

will connect

with

link

rate

lowers

a V.32

first,

for

issuing

the

Installation.

and

with

type.

with

to

&NO.

the

DTR signal.

commands

end

with

the

symbol

sets

the

another

BO

and

at

the

modem,

If

The

the

a

modem

to a

highest

set

that

the

Synchronous Operations 7-3

COURIER HIGH SPEED MODEMS

-

doesn't
(2400 bps).

HST

tions for these
modulation,
HST

For
modems
&N9 (16.SK bps). Find

accepts link rates

lower, set

Dual Standard

a variable link rate setting
may

Flow Control

Only

&IO,

control settings.

Transmit Clock Source (&Xn)

This setting specifies

the

users

work,

try

modems:

modem.

high

have

the following

&RO

Transmit

will

We

modems

unless

In

speed

connections

to a fixed link rate, &N6 (9600 bps), &NS (14.4K bps),

both

modems

modems:

to

set

a fixed link rate, for example, &N6 (9600 bps).

or

&Rl. See

clock timing signals for a

require

a fixed

do

that

over

the

link

rate

of

&N6 (9600

not

recommend

because

you

are

connecting

instance, set

with

out

first,

9600 bps. For 2400-bps connections

to a variable

Set

the

Dual

(&NO)

Courier

settings

Chapter

whether

default

the

setting,

synchronous

of

their

both

another

however,

link

Standard

first.

are

4 for

more

Courier

&XO.

asymmetrical

with

another

modems

HST

if the

rate,

modem

If

that

doesn't

allowed:

information

or

your

synchronous

bps)

or

&N3

communica-

USRobotics

to Bl.

modem,

Mainframe

&NO.

set

to

work,

&HO

or

on

DTE generates

call.

both

and

BO.

you

&Hl,

flow

Most

-

-

-

or

-

-

Try

-

-

-

-

-

&XO

The
signals
interface. Default.

&Xl

The

and

This setting is

operations. (Multiplexors
that

We

&X2

The Courier's Receiver clock is the

signals. The signals
sent
only

7-4

Synchronous Operations

Courier

DTE is the source of
sends

the

do

to

used

is

and

sends

them

channel

not

recommend

your

DTE

in

those

the

source

them

to

the

used

typically

carries several calls

are

over

systems

of

the

Transmit

to

your

DTE

the

Transmit

Courier

this setting for HST

looped

the

over

in

leased line

divide

RS-232 interface. This setting is

that

the

to

the

require

clock

over

the

clock

timing

the

RS-232 interface.

multiplexed

phone

at

source

channel

the

same

modems.

of the

Transmit

synchronization

timing

RS-232

time.)

timing

clock

signals

so

and

of

-

-

-

-

-

-

-

COURIER HIGH SPEED MODEMS

-

-

'-

-

data

flowing

this setting for HST

Synchronous Mode (&Mt)

The

DIALING

modem
modem
a

synchronous
connection,
synchronous
does

not

Command

OUT

The

modem's
configure the
out

to the

Below

1.

If

program
described in
AT

2.

Store a
according to

the Modem,

addition,
enter
string. The following is

must

remains

the

timing

respond

mode.

stored

modem

Host

are

our

your

communications

and

commands

command

include

synchronous

in

both

modems.

be

set

to

&Ml

in

asynchronous

connection

Courier

to

computer

recommended

put

Chapter

directly to

the

and

the

with a remote

enters

signals to

commands

command

for a

synchronous

by

the

computer

2.

string

guidelines

Host

the

&Ml

mode,

directions.

synchronous
your

until

feature (&ZC=s) allows

just

procedures.

software isn't

Terminal

the

(&ZC=s)

in

computer's

command,

followed

an

example:

We

for

synchronous

command

DTE.

it

returns

connection

pressing

in Terminal

mode

modem.

that

the

previous

requirements.

by

do

mode

modem.

mode

Note

the

voice/

running,

allows

configures

to

have

the

appropriate

not

recommend

operation.

until

it

makes
Upon
and

sends

that

the

Courier

to

asynchronous

you

and

to dial

data

switch.

load

the

mode,

section, Setting

you

the

as

to

send

the

modem

In

modem

Dial

The

to

-

In

the
while
timing

synchronous
follow the &F
last

3.

Set the
executes
switch.

AT &ZC = &F &X1

example, &F restores the

&Xl,

which

specifies

source, is

entry

before

voice/

the

Type

ATS32 = 9 <Enter>

the

only

mode

(&Ml).

command.

the

Carriage

data

switch

stored

command

the following:

&M1

DT5551234 <Enter>

modem's

the

computer

non-default

Any

non-default

The

Dial

Return.

to

Option

string

Synchronous Operations 7-5

factory defaults,

as

setting

command

9,

so

that

when

you

the

synchronous

used

settings

should

the

modem

press

besides

should

be

the

the

COURIER HIGH SPEED MODEMS

-

4.

5.

ANSWERING

First configure the
for dialing out. To store a configuration
execute

that

cations:

If

switch,
ending
example.

command.

NOTE:
purpose,
832
of

Press
the
communications

After
ations

begin

• Insert

•

you

If

you

you

= 9 in

the

characters

the

voice/

synchronous

the

call, restore

by

powering

when

you

on

the

SO

the

modem

Omit

the Dial

phone

don't

send
with

number).

wish

the

&ML

Note

usually

can

include

stored

may

not

data

Host
software

it off

modem

press

the

previous

= 1

in

the

to

Auto

string

to

use a stored

modem

The following

again

that

use

the

the execute

command.

exceed 30.

switch

the

when

computer.

loaded

the

modem
and

on

using

the

voice/

page,

with

stored

Answer.

shown

command

appropriate

all

non-default

voice/

data

stored

However,

you
You
at

the time.

to

asynchronous

again.

same

string

data

switch, follow

the

following modifi-

command,

in

the

same

configuration string,

adapts

the

settings follow

switch

command

the

total

want

to connect

need

not

have

guidelines

for

the

Step

2.

step

and

the

voice/

dial-out

for

another

option

number

with

your

oper-

described

modem

the

steps

This sets

(OT

and

data

command

the

&F

-

-

-

-

-I

to

-

-

-

-

-

AT

&F 50=1

The

modem

synchronous

waits

for

HANGING UP

The

modem

or

your
Ready
code

if

Command

7-6 Synchronous Operations

responds

mode

synchronous

remains

software causes

signal (DTR). The

result codes

mode.

&X1

&M1

<Enter>

automatically to

and,

in this case, because it is set

timing

online

are

signals from

until

the

DTE to

Courier

enabled,

and

the

remote

drop

sends

returns

an

the

incoming

your

DTE.

modem

the

Data

NO

CARRIER result

to

asynchronous

call, enters

to

&Xl,

disconnects

Terminal

-

-

-

-

-

-

COURIER HIGH SPEED MODEMS

CHAPTER

USER INQUIRIES

The

used

I

.-

-

-

IO

11

-

12

-

13

(In)

Inquiry

options

ATI3

ATI4

ATIS

ATI6

The
problem
ment,

The

(ROM)
used
read

The

(RAM)
code, followed
want
appears

The

It

the

command

modem

and

you

modem

and

only

the

same

modem

and

to

use

to

modem

displays

Kn

command

display
Call

Current
NVRAM
Link diagnostics

returns

may

performs a checksum

returns

in

factory testing. The

performs

returns

this

be

returns

the

the

duration

call USRobotics' Technical

be

number.

by

command

malfunctioning.

actual

8.

QUERIES AND HELP SCREENS

has

eight

options. The

following information:

settings

settings

summary

a 3-digit

asked

the

a test of its

either

OK

when

the

time

in

Chapter

product

for this

result

duration

product

to

the

modem

random

the

OK

the test is

as a checkpoint

of

if

set

to

5.

of its

screen. This

(0)

Kl.

most

code.

Support

code.

read

should

access

or

ERROR

completed.

if

the

last call

See

the

commonly

If

you

have

Depart-

only

memory
function
always

memory

(4)

result

You

the

modem

if

set to

description

a

is

may

KO.

of

-

-

14

The

modem

the

following

displays

page

is

its

current

an

example.

configuration.

Queries and Help Screens

Figure

8.1

on

8-1

COURIER HIGH SPEED MODEMS

-

IS

ati4
USRobotics

OK

The
random
example.

OK

Courier

16800

HST

Dual

Standard

B0

Ct

Et

Ft

Mt

QB

Ut
BALJD=t9Z00 PARITY=l't
D HIL=PULSE

&Al
&M4

S00-B01
SOb=002
S12=050 S13=000 S14=000 S15=000
S18=00B S19=000
S24=150 S25=000 SZ6=000
S30=000
S36=000
S44=015

LAST

modem

DHlL~PULSE

BALJD=l9200 PARITY=N
&Al

&NB
SOZ=043 S03=013 S04=010 S05:=008 S0b=00Z S07:=0b0

S0B=002 S09=006 S10=007
S15=000 S19=000 SZ1=010 S22=017 S23=019 S24=150
S25=005 S26=081 S27=000 S28=008 S29=028 S32=001
S33=000 S34=080 S35=000 S36=000 S37=800 S38=000
S41=000 S42=12& S43=200

STORED

Ort

HOOi<

&BB

&Cl

&D2

&NH

&PO

&Rl

S01=B0B

S02-043

S07=0b0 S08=002

SZ0=000

SJ1=0B0 S32=000
S37=000 S38=000 S41=000 S42=126

DIALED

u:

17085551234

Figure

8.1-Sample

access

80

&BO

8G0

&PO

8R1

PHONE

ue:

#1:

uz:

113:

displays

memory

Fl

8H1 & l0
&SO

1-708-555
1-312-555-5!;78
1-784-555-4567

555-1212

c:

8F&M1&X1DTS551234

Xt

UORDLEl't=8

TI

MER

&GB

&Hl

&10

&SO

Ml

X1

UORDLEN=8

&TS

&1<1

&T~

&XO

&Yl

S03=B13

SB4-010

S09=00!;

S10=007

S16=000
SZ1=010 SZZ=B17
SZ7=000 S28=008
SJJ=000

SJ4=000

Result

the configuration

(NVRAM), as

&Kl

&LO

&M4

&'l1

%R0

Sl1=070

S12=050 S13=000

S'l4=015
1234

Settings

&LB
%RO

SB5=0B8
S11=070
S17=000
SZ3=019
S29=000
SJ5=000
S43=Z00

of A T14

•••

stored

in

Command

in nonvolatile

the

following

-

-

-

-

-

-

-

-

-

-

-

Figure

8-2 Queries and Help Screens

8.2-Sample

NVRAM Settings Screen

-

-

-

-

-

COURIER HIGH SPEED MODEMS

-

-

-

16

During
mation
can

a connection, the

about

link operations.

request

a diagnostic

example.

itli&

USRobotics

Chars
Chars
Octets
Blocks
B 1

Retrains

Line

Link

Data
Equa
Fall
Protocol
Speed

Disconnec..;l

01{

Figure

For calls
may

be

sent

ocks

Reversals

TiHeouts

CoHpr-ess

112atl

back

under

less

lost

sent
sent
r-esent

Courier

14400

Requested

ion

on

Rt::!dson

is

DTR

8.3-Sample

data

than

the

HST

Dual

13095

5Z38

&9

U4ZBIS ZEMBl'3Z
Long
Enabled
LAPM

9&001'9&00

dropped

compression,

number
operations. Line Reversals
operations,
channels.
in

HST

Most
the

following:

mode.

terms

when

the

modems

At

this time, online fallback is

used

in

the

display

modem

summary,

Standard

Char-s

0

Octets
Blocks

0

Retr-a
Biers
Link

Link

of

only

switch

are

monitors

When

as in

Link

Diagnostics

Receiued

Received
Received

ins

Gr-anted

Haks

Diagnostics

the

number

octets sent,

applies

to HST-mode

the

the

call is

the

...

Screen

of characters

due

high

only

reported

and

stores infor-

ended,

following

1283

513

7

(A Tl6)

to buffering

and

low

self-explanatory except for

you

sent

speed

Enabled

-

-

Octets:

greater
probably
file,

Compressed

than

used

and

the result

the

MNPS

number

was

Line Reversals: The

switched

Blers: Errors

block errors,

the

high

in

data

your

and

receiver

the line.

Blocks Resent: These

due

to

the

previous

category,

data

units.

If

of characters sent,

compression

expanded

number

low

and

protocol blocks.

represent

data.

of times HST-mode

speed

channels.

may

have

blocks

Blers.

Queries and Help Screens 8-3

the

number

the

on

an

already

If

experienced

the

remote

of octets is

modems

compressed

modems

there

were

problems

modem

many

on

resent

COURIER HIGH SPEED MODEMS

-

Link

Timeouts: Protocol

were

severed

recovered. This

Link

Naks:

Data

Compression: Indicates

negotiated
response
string

length

more

information.

Equalization Long/Short:

short

if

Fallback:

modems
sequence.

Protocol: Indicates

MNP,

NONE)

Speed: The last rates

operating

Disconnect Reason: Possible

follows:

DTR

signal,

momentarily,

does

Negative

for

the

call

includes

bit

0=

Enabled/Disabled:

negotiated

before disconnecting.

dropped: The DTE

terminating

the

used,

1.

Short

or

SYNC for a

detection

and

not

indicate

acknowledgments

(V

42BIS

size of

for example, 2048/32. See

Status

equalization

online

the

at

the

fallback

error

which

dropped

call.

problems:

the

modems

the

retry

the

type

of

or

MNPS)

the

dictionary

of S15

bit

applies

indicates

control

synchronous

the

reasons

whether

during

protocol

receiver I

the

the

Data

communications

probably

timeout.

(one

or

more

data

compression

or

NONE.

and

the

Appendix

O;

long

if

only

to HST

or

the

connection

negotiated

call.

transmitter

modem

hung

Terminal

blocks).

A V 42BIS

maximum

A for

bit

0=0,

modems.

not

the

(LAPM,

were

up

are

Ready

as

-

-

-

-

-

-

-

-

-

Escape code:

code.

Loss

of

modem's
SlO (default is 0.7 seconds).

Inactivity

line for
timer

disabled).

MNP

incompatibility: The

remote
an

MNP

Retransmit

twelve

8-4 Queries and Help Screens

The

carrier: The

carrier

the

modem

negotiation

attempts

and

timeout: The

duration

does

limit: The

to

operator

transfer a data

sent

modem

waited

modem

specified

modem

not

have

procedure

modems

detected
the

the

modem

duration

detected

in

Register

MNP

error.

reached

frame

the

+++ escape

loss of

is set to &MS
capability,

the

specified

no

activity

Sl

9 (default is

or

the

maximum

without

remote

in

Register

on

and
there

error.

the
0,

the

was

of

-

-

-

-

-

-

-

COURIER HIGH SPEED MODEMS

-

-

-

LD received:

Link

Disconnect

DISC:

Loop loss disconnect:

on

the

loop
office.
hung

up:

there

is a

S38 is

set

at

loop

Unable to Retrain:

the

phone

they

could

Invalid

link

rate,

rate.

XID

Timeout:

Detection

SABME

Extended):
negotiation.

The

remote

request.

The

remote

connecting

This

usually

the

central
disconnect
higher

loss.

speed:

and

Timeout

than

line

prevented

no

longer

The

the

remote

The

(XID Exchange)

(Set

The

moderns

modern

modern

moderns

modern

sent

The

modern

it

with

the

occurs

After

because

office

drops

at

the

other

zero,

the

several
the

moderns

transmit

Asynchronous

or

is

set

modern

failed

phase.

failed

sent

a V.42

detected

telephone

the

current

end

modern

attempts,

receive

to

&Nl

is

not

to

Balance

this

part

an

MNP

Disconnect

a loss

company

remote

momentarily

of

a call.

immediately

disturbances

from

retraining,

data.

or

higher,

operating

negotiate

Mode

of

V.42

error

frame.
of

modern

Unless

for a fixed

at

the

the

V.42

link

control

current

central

has

when

Register

hangs

on

and

same

up

-

-

-

Break Timeout:

occurred.

Invalid

(compression)

A

(compression)

Illegal

bis

Extra Stepup:

(compression)

17

Codeword:

Rootless

Command

(compression)

The

modern
problem
may

be

Incompatible

The

modern

frame.

Tree:

The

modern

frame.

Code:

The

frame.

The

modern

frame.

returns a product

and

call USRobotics' Technical

asked

to

read

this

received

screen.

processing

received

received

modern

configuration.

Queries and Help Screens 8-5

of a Break

an

an

invalid

received

an

invalid

Support

invalid

V.42

an

invalid

V.42

If

you

staff,

signal

V.42

bis

bis

have

you

bis

V.42

a

COURIER HIGH SPEED MODEMS

-

S-REGISTER QUERY (Sr?)

This

command

Register, as

of Register

PHONE NUMBER QUERY (&Zn?)

At

this

command,

in

NVRAM

includes a

LAST-DIALED NUMBER INQUIRY (DL

At

this

command

last-dialed

STORED COMMAND STRING QUERY (&ZC?)

At

this

command

stored

in

allows

in

the

SO

("On

ATSO?

at

position

sample

AT&Z3? <Enter>

5551234

number

ATDL?

NVRAM

you

following example

what

<Enter>

the

modem

n,

modem

the

modem

buffer:

the

modem

with

the &ZC=s

to

view

ring

will the

returns

as

in

the following

response: -

?)

displays the

displays

the

contents of a particular

that

requests

modem

the

phone

number

the

command

command:

the

answer?"):

number

example

stored

string

contents

stored

that

in

S-

the

-

-

-

-

-

-

-

-

AT&ZC?

HELP SCREENS

Courier
basic AT
S-Register functions,

Stop/Restart Display

The following
Control

To restart
key>.

8-6 Queries and Help Screens

modems

command

command

key

and

<Ctrl>-S

the

display,

provide

set,

type

four

Help

extended

and

Dial

command

stops the display.

"S":

use

the

same

screens:

ampersand

options.

Hold

command

summaries

(&)

command

down

or

press <any

of

the

the

set,

-

-

-

-

-

-

-

Cancel Display

COURIER HIGH SPEED MODEMS

-

Either of

Basic Command Set

At

AT$, the
summary
pressing
screen is

HELP,

&$
%$

Al

A)
AT
A
Bn

Cn

Dn

DL
DSn
D$
En n=0

Fn

Strike a key

the

following

<Ctrl>-C
<Ctrl>-K

($)

Courier

of

the

any

key,

shown

Co1111and

HELP, AMpersilnd Cot1Hilnds
HELP,

Percent
Repeat
Contim1ousl!I
Conl'lilnd Mode Pr•ef
Ansuer
n=0 U32 Mode/CCITT
n=l

HST
n=0 Trans11 i
n=l

TransMi
Dial a Telephone
n=0

..

911><TPR,;

Dial

Last

Dlal

Stored

HELP,

Di

Ho
n=1 Echo
n=0

Online
n=1

Ho

displays a screen

command

shows

in

Figure 8.4.

Quick

Reference

Co1111ands

Last

Co1111and

Repeat

Col'lttand

ix

Call

Mode/Bel 1 Ansuer

ill
Co1111and

Co1111and

Online

when

tlEr

Off

tlEr

On
Hu11ber

"W~!

0-

Phone

ttu11ber

Ph.one Hu11her

Co1111ilnds

Echo

Chars:

Echo

Echo

read!!

Ansuer

commands

cancels

that

the

display.

shows a partial

set. A second screen, activated

the

remaining

<CTRL-S

to

l<n

Mn

Seq

On

Seq

Qn

Sr=n

Sr?

S$ HELP, S
T
Un

commands.

Stop,

CTRL-C

n=0 Cill l
n=1

Real

n=0

Speaker

n=1

Speaker

n-'-2

Speaker

n=3

Speaker

n=0

Return

n=l

Return

n=Z

Return

Pulse

Dial

n=0

Result

n=1

Quiet

n=Z

Uerbos:e/Quiet

Sets:

Register

Query

Register

Tone

Dial
n=0 Nu11eric
n=1

Uerba l R"sponses

to

Duration
Ti11e

Off
On
Aluil!jS
Off

On

Ii
On!
Online & Speed

Codes

<No

"r"

11r11

Registers

Responses:

Cancel)

Mode

Clock

Mode

lJnt

il

On

During

ne

ine & Retrain

Sent

Result

On

to

"n'"

The first

CD

Dial

Shirt

Codes)
Ansuer

by

-

-

Figure

8.4-Sample

Extended Command Set(&$)

At

AT&$,

summary

screen, activated

command

the

Courier

of

the

extended

by

set. The first screen is

Basic

Commands

displays a screen

ampersand

pressing

any

key,

shown

Queries and Help Screens 8-7

HELP

that

shows a partial

command

shows

the

in

Figure 8.5.

Screen

set. A second

remaining

COURIER HIGH SPEED MODEMS

HELP,

&An

&Bn

&Cn

&Dn

&F

&Gn

&Hn

Strike a key

Figure

AMpersand

n=0

n~t

n=2
n=3

n~e

n=1 Fi><ed
n-2
n=H
n=1
n-0

n=1

n=2
Load
n=0
n=1
n=2
n=0
n=l
n-Z

CoMMands

Disable

-'ARQ

Enable

/l:UlO

Enable

/Mo

1 e -'E><tra

DTE

Speed

A I

ways

Controls

I~nore

DTR

Confro

~'actory

Configuration

No

Guard

llz

Guard

Hz

Guard

TX

when

ready

du

DTE

Sp.,ed
Fixed
Un

1 s

Tone

Flow

Enab
Floating

DTE
Cll
ModeM

Reserved

DTE

550
1800
Disable

crs

Xorv'Xoff

8.5-Sample

<ClRL-S

Result

Result

Jati

Resu

Speed

CD

DTR

Tone

Ton"

Ampersand

Dialing (0$)

At

ATD$, the

Courier

displays

Codes

on

Codes

1 t

When

Control

to

Codes

Codes

ARQ

Stop,

ClRL-C

&Pn

&Rn

&Sn

&Tn

&IJ
&Xn

this Dial

to

Cance[)

n=0

IL

Atterican

n=1

UK

Pulse

CTS

Fo

11

Ignore

RTS

RX

to

DTEl'RTS

DSR

Always

ModeH

Contra

«e

llSR,

Pulse

DSR

Encl

Tes

nna

log

Loopback < 11LB>
Digital
Grant

ReHote

ReHote

Re

Mote

Digital

DLB
ALB

IJith

Configuration

DCE

Synchronous

Dial

ow«

L

Loopback

Self

n=0
n=l
n-Z
n=0
n-1
n=L Pu l
n=3
n-0
n=l
n=3
n='I
n=S Deny
n=G
n=7 ReMote
n=8
Store
n-0

Commands

command

Pulse

Dial

RTS

hi

~h

On

Is

DSR

CTS=CJ)

(DLB)

DLB

DLB

Loop

IJith

Self

Test

Clock

HELP

summary:

back

T"sl

-

-

-

-

-

-

Screen

-

-

atd$
HELP,

Dial

CoHHands <CTRL-S

0-9

Digits

to

Dial

Auxiliolry

Tone

Auxiliary

Tone

Pulse

Call

POluse

ReHain
Used
IJait
IJ"
Flash

01{

Figure

It

Didi

Tone

Dial

Dialing

Ilia

ling

an

Ori!finate

(IJail

for·

SB

in

CoHHand Mode

to

Dial

Alpha

for

Znd

Dial

for

an

Ansuer

Switch

Hook

8.6-Sample

8-8 Queries and Help Screens

Digil
Digit

Only

Ti.,e)

Phone

Tone

< X3-X7>

to

Stop,

ModeM

After

tt'

s

<X3-X7>

CTRL-C

Dialing

Dial

to

CanceD

Command

HELP

Screen

-

-

-

-

-

-

-

-

-

COURIER HIGH SPEED MODEMS

-

-

-

-

-

S-Register Functions

At

ATS$, the
summary
by

pressing
screen is

HELP, S

S0

Ring

St

Counts

SZ

Escape

S3

Carri

S4

Line

SS

Backspace

S6

Uiiit

S7

U<1it

SS

CoMMa

S9

Cilrrier

S10

Carrier

S11

Dial

S1Z

Escape

S13

Bit

Strike

(S$)

Courier

displays

a screen

of the S-Register functions. A

any

key,

as

follows.

Register

to

Ansuer
11
Code

age
Feed

TiMEY'Dial
TiHel'Carrier

Thie

Detect

Loss

Tone

Code

11apped

1 =

Reset

2 =

Do

'I = tlo

8 =

Do

a ke':J when

Figure

shows

Functions

On

of

Rings
Char>

Return

Char
Char
Char

Tone

<sec)

(sec)

TiHe

TiMe

(1/10sec)

Spacing

(Msec)

Tl

He ( V50sec)

On

DTR

Loss

Originate

in

Pause

Before

DS0

On

DTR

read'j

8.7-Sample

<CTRL-S

<sec)

(11'10sec)

Auto

Ans:we.- f,'I =

Result

the

remaining

to

Stop,

S19
S20
SZ1

SZZ
SZ3
SZ4
SZS
SZ6 RTSl'CTS
SZ7

Codes

SZ8 U32

S-Register

CTRL-C

Inactivit'J
Reserved
Break
Xon Char'
Xoff
DSR
Reserved

Bil

1 =

2 =

'I =

8 =

1& = Disilble
32 = Disilble

128 = Unusual

that

shows a partial

second

screen,

registers. The first

to

CanceD

TiMeout

(Hin)

Length ( V100sec)

Char

Pulse

TiMe

(1/50sec)

Delay

TiMe

Mode

TCl1
U3Z
Z100h:z
MNP
U.

'12

SU-Inco11patibil
Ti11" <

HELP

<VHl0sec)

Handshake

Detect

V10sec)

Screen

Mapped

U21
Disable
Disable
Dls;ible

Rese.-ued

Handshake

activated

Phase

ity

-

-

-

Queries and Help Screens 8-9

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

COURIER HIGH SPEED MODEMS

-

-

-

-

-

-

-

-

-

Appendix

Link

Error
CCIII V .42
MNP
Data
Flow
Throughput

Appendix

The RS-232 Interface
Front
DIP Switch
Default Settings
S-Register
ASCII

Appendix

Requirements
Basic
Ampersand
Percent

Remote Access

A-Link

and

Error

Control

Negotiation

HST

Mode

V.32

bis

Mode

Dual

Standard

Control

Handshaking

Compression

Control

Achievable

B-Summaries

Panel Indicators

Summary

Summary

Chart

C-Alphabetical

Command

Command

Handshaking

Guidelines

Throughput

Command

TABLE OF CONTENTS

PART II. REFERENCE

Negotiation

(Handshaking)

Handshaking

and

Throughput

Set

Set

Set

Commands

(Handshaking)

and

Tables

Command

A-1
A-1
A-3
A-5

A-5
A-6
A-6
A-6
A-7
A-7
A-9

B-2
B-4
B-6

B-9
B-12
B-21

Summary

C-1
C-1

C-6
C-11
C-11

-

-

-

-

Appendix
Appendix

Fax
Voice/Data
Remote
High
Dedicated Line
Hewlett

MI/MIC

D-Problems
E-Fax

Operations

Configuration

Speed/Low

and

and

Packard

Operations

3000 Installations E-19

and

Other

Speed

Protocol E-13

Leased Line

Solutions

Operations

Operation

D-1

E-2
E-3
E-7

E-16

E-20

continued