Tandy 1400 LT User Manual

Cat. No. 25-3510

1200

bps Modem

For

Tandy

1400 LT

User's

Manual

i

ft

ft

ft

1200 bps Modem

for

Tandy®

1400

LT

User's

Manual

©

1987,

Tandy Corporation,

All Rights Reserved

Table of Contents

Chapter 1

Introduction

1

.

Introduction

1-1

LI What is a Modem?

1-1

1.2

Make

a

Call or

Answer

1-2

1.3

Use

Your Modem with a Database

1-2

1.4

Easy to Use

1-3

1.5 Introduction to Modem Features

1-3

1.6 How to Use this Manual . . .

. 1-3

Chapter 2

Installation

2.0 Getting Ready

2-1

2.1

Connecting Your Tandy Modem to

the

Telephone Line

2-1

2.2

Connecting Your Modem

to

Your Computer

2-2

2.3

Installation

2-2

2.4

Auto

Answer

2-4

2.5

Testing Your Modem

2-5

Chapter

3

Testing

Your

Modern

3.0 Testing

the

Tandy

Internal

Modem

3-1

3.1

Performing

the

Local

Analog

Loopback

Test

3-1

3.2

Remote

Digital

Loopback

t 3.3

Chapter

4

Introduction

to

Modem

Operation

4.0

Direct

Entry

into

the

1200 BPS

Internal

Modem

Command

Mode

4_1

4.

1

Functional

States

4_1

4.2

Changing

of

States

4-2

4.3

Command

Syntax

4.4

4.4

Command

Results

4_5

4.5

Speed

of

Transmission

4_g

4.6

Dialing

with

Examples

4-9

4.7

Auto

Answer

Mode

4-15

Chapter

5

Command

Summary

5.1 A

-

Answer

Immediately

5-1

5.2 A/

-

Repeat

Last

Command

5-2

5.3

C

-

Carrier

Signal

Control

5-3

5.4

D

-

Dialing

Command

5-4

5.5

E

-

Echo Back

Control

5-4

5.6

F

-

Set

Communications

Mode

5-5

5.7

H

-

Hook

Control

5-6

5.8

M

-

Monitor Speaker Control

5-7

5.9 O

-

Return

to

On-line State/Initiate

Retrain Sequence/RDL

Test

5-8

5.10 P

-

Pulse Dialing

5-9

5.11

Q

-

Quiet Mode Control (Result Codes)

5-9

5.12

R

-

Reverse

Mode

5-10

5.13

Sr?

-

Determine Status

of

a

Register

5-10

5.14

Sr=n

-

Change Register Value

5-11

5.15 T

-

Touch

Tone

Dialing

5-11

5.16 V

-

Result Code Control

5-12

5.17 W

-

Wait for Dial Tone

5-13

5.18 X

-

Extended

Result

Code Set

5-13

5.19

Z

-

Modem Reset

5-15

Chapter

6

Modem

Registers

6.1 The Set Command

6-1

6.2 Reading and Changing

Registers

6-2

6.3 Register SO

-

Auto Answer

6-3

6.4 Register SI

-

Rings

Passed

6-4

6.5

Register

S2

-

Escape Code

ASCII

Value

6-4

6.6 Register

S3

-

Command Terminator

ASCII

Value

6-5

6.7 Register S4

-

Line Feed ASCII Value

6-6

6.8 Register S5

-

Back Space

ASCII Value

6-6

6.9

Register

S6

-

Wait for Dial

Tone Time Period . . .

6-6

6.10 Register S7

-

Wait for

Carrier Time Period

6-7

6.11 Register S8

-

Pause Time of Comma

6-7

6.12 Register S9

-

Carrier Signal

Detect Time

6-8

6.13 Register

S10

-

Carrier Loss

to

Disconnect

Delay Time

6-9

6.14 Register Sll

-

Speed Control for

Touch

Tone

Dialing

6-10

6.15 Register S12

-

Escape

Code

Guard Time

6-10

6.16

S13

-

S16

Status

Registers

6-11

6.17 Programming

Suggestions

and Considerations 6-15

6.

18

Command

Executions

.

6-15

6.19 Escape

Code

Precaution

6-16

Appendices

Appendix

A

-

ASCII

Code

Chart

App-1

Appendix B

-

Technical

Information

App-5

Addendum

Addendum

A

Add-1

Introduction

Chapter 1

INTRODUCTION

1.0 Introduction

Welcome

to

the world of

personal computer

communications-

You

have purchased Tandy's 1200

bps

internal modem for the Tandy

1400 LT. With this system and

your personal

computer,

you can

call

information sources, such

as

Dow Jones News

Retrieval, ex-

change

information with mainframes,

minis, or

personal comput-

ers, and

transfer files.

The Tandy system you

have purchased

contains several elements:

1)

The modem card.

2)

A modular

telephone cable.

3)

This

manual, which provides

complete

installation and oper-

ating instructions.

1.1 What is a

Modem?

A

modem allows

your computer

or terminal to

communicate with

another

terminal

or computer over the

phone lines.

The word

"modem" is an

acronym for

MOdulator/DEModulator. A

modem

converts

digital data,

generated by

the

computer,

into analog, or

l~l

Chapter

1

audio

tones,

suitable

for

transmission

over

regular

telephone

lines.

When

you send

data

to

another

computer,

your

modem

translates

the

computer

data

into

audio

tones.

At the

other

end,

the

modem

attached

to the

remote

computer

"demodulates"

the

audio

data

back into

the digital

language

of

the

computer.

1.2

Make

a Call

or

Answer

Your

modem is

able

to dial

automatically,

either

pulse

or

touch-

tone,

and

communicate

with

time-sharing

services

or other

com-

puters

as well

as answer

incoming

calls.

When

your

modem

is

in

the

Originate,

or

Call Mode,

it

means

that

your

modem

is

set

up

to

make

a call.

Your

modem

is

expecting

another

modem

at the

other

end

to answer

the

call.

Conversely,

you can

set

your modem

to the

Answer

Mode,

meaning

that any

time

a call

comes

in,

your

modem

will

answer.

(If

you expect

to be

receiving

many

data calls,

it's

a

good idea

to

install

an extra

phone line.

When

you're

set

to

auto-answer,

the

modem

will

answer the

phone

regardless

of

whether

there

is

a

modem

or

a human

at the other

end!)

1.3

Use

your

Modem

with

a

Database

Once the

computer

is

connected

to

telephone

lines

it can

commu-

nicate

with

other

computers.

For

example,

you can

use

your

PC

and

modem

to

call

an

information

utility

such

as Dow

Jones

News

Retrieval

or

The

Source.

Dow

Jones and

The

Source are

large

computer

databases,

whose

information

is

rented

to

the

public.

1-2

Introduction

Once

you

are connected

to one

of them,

you

can, for example,

read

the

latest

stock quotes or the morning's Wall Street Journal.

1.4 Easy-to-Use

Your

Tandy

1200

bps

internal modem is made to be easy to

use.

More and more

applications for the

PC

and

your

modem are

be-

coming available.

Now,

for example,

you

can plan your

travel

by

linking with the latest airline schedules or

check your bank bal-

ance from the comfort of your living room. In the

future, the

uses

for your modem will continue to grow.

1.5 Introduction to Modem Features

Your modem has many

advanced features, such

as:

1)

Auto-dial and

auto-answer: no telephone is required.

2)

Powerful automatic dialer commands compatible with virtu-

ally all of the

communications software available.

3)

Can

be

used with an

acoustic coupler.

1.6 How to

Use

This Manual

This manual should

be

used

in conjunction

with your software

manual. Chapter

2 includes complete

installation instructions.

1-3

Chapter

1

Chapter

3 covers testing

the

modem.

More

technical information

about the

modems internal

command

set is included

in Chapters 4

through

6.

1-4

Installation

Chapter 2

INSTALLATION

2.0 Getting

Ready

This chapter will explain installation of

the Tandy 1200

bps

inter-

nal modem.

2,1 Connecting Your Tandy

Modem to the

Telephone Line

In order to operate, your

modem must be

connected

to a

tele-

phone line. Your modem is FCC registered for direct

connection

to

the

telephone line. Before proceeding, you should call your lo-

cal telephone company and

inform them that

you

are going to

connect registered equipment.

Follow these steps:

Inform the local telephone company that

you

are

connecting regis-

tered equipment. Give them the

following information:

Manufacturer: Tandy

Corp.

Fort Worth, TX

Model: 1200 bps

Internal Modem

Registration:

AU692V25-35 10

Ringer Equivalence:

0.4B

2-1

Chapter

2

Your modem

has

been

registered with

the

Federal

Communica-

tions

Commission

and

is approved

for

connection

to any standard

telephone

line in the

United

States.

2.2

Connecting

Your Modem

to

Your

Computer

The following

steps

will

explain installation

of your

1200

bps inter-

nal

modem

in your

computer.

PLEASE

FOLLOW

THESE IN-

STRUCTIONS

CAREFULLY.

NOTE:

Whenever

you are

installing

or

removing

boards

in

your computer,

make

sure

that the POWER

IS

SWITCHED

OFF.

NEVER

INSERT

OR

REMOVE

THE

MODEM WHEN

THE

POWER

IS ON.

2-2

2.3

Installation

Installation

S*

1

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MODEM OPTION

X

SLOT

COVER

1

e

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®\yAy/Q

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-it- :v_cc EXTER\A

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DIS*

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SCREWS'

To Install:

1)

Remove the slot cover

over

the "Modem Option" slot on the

back of the

computer.

It is held in

place

by two

small s crews -

2)

Gently slide

in the

modem

as

illustrated. Press in to ensure

that

it is seated securely in the

connector.

Use the

screws that

held the cover to secure the modem into the

computer.

2-3

Chapter

2

ACOUSTIC

COUPLER

JACK

RJ11C

3)

There

are

two

modular

phone

connectors

on

the rear

panel

of

the

Tandy

1200

bps internal

modem.

Connect

one end

of

the

modular

phone cable

supplied

with

the

modem

into

either

of

these

two

jacks.

These

jacks

are identical;

it

does not matter

which

one

you use.

Connect

the other

end

of this

modular

cable

into

your wall

jack.

NOTE:

The

second

jack

on the

back of

the

modem

can

be

used

to connect

your

standard

telephone.

This

is

provided

for

your

convenience.

You

may plug

your telephone

into

this

jack

and

continue

to use it

normally.

The

modem

can

be left

2-4

Installation

connected even

when

your computer

is turned off.

It will

not

affect

the

normal

use

of your telephone.

4)

If

you will

be using the Tandy

Acoustic

Coupler, insert

the

connector

into

the holes marked

Acoustic

Coupler.

There

is

only

one

way to insert the

connector.

TELEPHONE

CABLE

\_

ACOUSTIC

COUPLER PLUG

ACOUSTIC COUPLER

JACK

5)

You are

now ready

to

initialize

the modem.

Begin from

the

DOS

prompt

"A:"

While

holding

down

the Ctrl and

Alt keys,

press

the Ins

key.

This

will bring

up the Tandy 1400

LT

Set

Up Menu.

6)

Press the F4 key

to

highlight

the RS232C /

Internal

Modem

option.

Press the right

arrow key to

highlight MODEM.

Press

ENTER.

7)

Press

the F5

key to highlight

the Direct Modem /

Acoustic

Coupler

option. Press

the arrow

keys

to

highlight DIRECT

if

you will

be

connecting

the modem

directly

to

the

phone line

or

to ACOUST

if

you will

be

using the Acoustic Coupler.

Press ENTER

and then escape to return

to DOS.

8)

You

are now ready to

use the modem. Note

that

you do not

need

to

reinitialize

each

time

you

use the modem.

However,

2-5

Chapter

2

each

time

you

switch between direct

use

and

the

acoustic

cou-

pler, you will need to reinitialize, following steps

5-7.

2,4

Auto

Answer

Your modem is set up to automatically

answer incoming calls. The

auto answer function

is controlled

by

the SO register.

If

you wish

to disable auto answer, access the modem command

set

with

your

communications software and

enter

the

command ATS0=0<CR>.

See section 4,7 for additional information.

2.5

Testing Your

Modem

So that

you

can make sure that your equipment is correctly in-

stalled and

working, your modem can perform several self tests.

Consult

Chapter 3 for instructions.

2-6

Testing

Your Modem

Chapter

3

TESTING

YOUR

MODEM

3.0 Testing

the

Tandy Internal

Modem

So that

you can make

sure that

your equipment

is

correctly in-

stalled

and working,

your 1200

bps internal

modem can

perform

several

tests

to check the

modem's

local and

on line

modes.

3.1

Performing

the

Local

Analog

Loopback

Test

These

tests check

the

modem's

Originate and

Answer

modes. Be-

fore

you perform

these tests,

disconnect

the phone

cable from the

wall

jack to the

modem. If

this

cable is

not

disconnected,

the

test

results

may not be

valid. After

performing

the

tests,

be sure

to

plug

this cable

back

in.

To

perform the

tests:

1)

Turn

your computer

on.

2)

Use your

communications

software

to access the

modem's

local

command

set.

3)

To

test the Originate

Mode, type in the

command:

AT

S16=l

CI

D<CR>

3-1

Chapter

3

If the modem is correctly

installed, it should respond:

CONNECT

At this point every

character entered

from

the

keyboard

goes to

the modem's

transmitter section and, instead

of going

out

over the

phone line, is rerouted to

the modem's receiver section.

From

here,

the characters are

displayed

on

the screen.

The key

you

press

should match the character

displayed on the screen,

4)

To

exit the test, enter:

+++

Do not enter

<CR>

after +++.

The modem responds:

OK

5)

If you do not

wish

to test

the answer

mode, proceed

to

step 7.

Now,

if you wish to test

the Answer Mode,

type

in

the com-

mand:

AT S16=l A<CR>

The modem should respond:

CONNECT

As with the Originate

test,

every character

entered from the

keyboard should match the

character displayed on the

screen.

6)

To exit the test,

enter:

+++

Do

not enter <CR> after

+++.

The modem responds:

OK

7)

Enter:

AT S16=0H<CR>

3-2

Testing

Your

Modem

The modem

responds:

OK

This resets

register

S16

and frees the modem

for normal

opera-

tions.

8)

Remember

to plug

the

phone cable

back

in before making

a

call.

If

there is

a problem:

1)

Is

the modem

firmly

seated in the

expansion slot?

2)

Double

check

that

you

have

disconnected

the phone line.

3.2

Remote

Digital

Loopback

RDL

is an

advanced

test feature which

allows one modem

to re-

quest the remote

modem

to

"loopback"

data

sent

to it. The RDL

feature

allows

you to

make

a complete

unattended

test of the re-

mote

modem. Your

local modem

sends the data over

the phone

lines to the

remote

modem. The remote

modem will

then loop-

back whatever

is sent, and

you should see

your test message

ap-

pear

on your screen

exactly

as you sent it.

This

test must

be

performed

when the modems

are on line.

To

begin

the

test,

you must enter the

command mode,

using the +++

escape

code. Once on line

and in command

mode,

you

can tell

the

modem

to begin

the

test.

1)

In

command mode,

enter:

AT02<CR>

3-3

Chapter

3

The

test is now underway.

The

message CONNECT

followed

by OK will be displayed.

Note

that a result

code of ERROR

indicates

that the remote

modem is not

capable

of responding

to RDL

or has not

been

conditioned

to do so.

2)

Enter

a test message:

How now brown

cow.

3)

Check

to

see

whether

your

test

message

is appearing

on the

screen

exactly

as

you

entered

it.

4)

To

end the

test, enter:

+++

5)

Modem should

respond:

OK

You are

now in command

mode.

6)

Enter:

AT01<CR>

7)

Modem

responds:

CONNECT

The

test is ended

Notes:

1)

RDL is

automatically terminated

when

the connection is

dis-

continued.

2)

If the line

is disconnected

during RDL (the

phone

line is

pulled

out of the

wall, etc.), the requesting

modem will reset.

This

prevents

an unexpected request

for RDL during

the next

call.

3)

Your modem

will always

respond to RDL when on-line.

The

modem will

respond to and

initiate RDL;

it

does

not matter

which modem

placed the original

call.

3-4

Testing

Your Modem

4)

Note that

the

00 command

returns

you to your

previous

state.

So

if

you enter

ATO0<CR>

once

you

have

initiated

RDL, the

command

will

NOT

exit

the

RDL

mode

when re-

turning

on line.

To exit

RDL

and return

on

line,

you

MUST

enter

AT01<CR>.

If your

modem

has echoed

back

the test message

exactly

as

you

sent it,

your

modem,

the remote

modem, the local

data

terminal

equipment

and

the phone

lines all

check

out.

If

there

is

a

problem:

If

the

test message

does not

echo

back correctly,

either

your

mo-

dem, the

remote

modem,

the data

equipment or the

phone

lines

are

at fault.

If

you have

already

successfully

performed

the local

analog

loopback

test,

you know that

your modem

and

computer

are

communicating

properly.

If there

is

a remote

operator,

he

or

she

may wish

to perform

a local

analog

loopback

test

as well

to

verify

that

the remote

modem

and computer

are

communicating.

Assuming that

both

the local

and

remote modems

have success-

fully

performed

local

analog

loopback

test:

1)

Can

you

hear

your

modem

dialing?

2)

If the

modems are

connecting

but

the

test message

is not

coming

through,

you may have

a problem

with the

phone

lines.

Disconnect

and try again.

3-5

Introduction

to

Modem Operation

Chapter 4

INTRODUCTION TO MODEM OPERATION

4.0

Direct Entry into the 1200 BPS

Internal

Modem Command Mode

This chapter describes the functional

states

of the 1200

bps

inter-

nal modem and

the guidelines

to

follow when sending commands

to it. The

responses

which the

modem sends to your

commands

are also

described.

For those who want to use

the modem's

commands directly,

ac-

cess

the modem

through your communications

software. Then

en-

ter the command AT

Z<CR>

t

which will set

the modem options

to

their default values.

4.1 Functional

States

The modem

will

always be in one

of

two states:

local

command

state or on-line state. In the local command

state, the user is

making commands

to

the

modem via keyboard or

program con-

trol. No data

is being sent

or

received.

The local

command state

is

provided

so

that

the modem can be

commanded to

perform vari-

ous

functions, such

as

changing

configurations and

dialing. In

the

on-line state, the data is

sent and

received over the phone lines.

When on-line, the modem will be

in the

originate mode (when

the modem is

making a call) or the

answer mode (when accepting

4-1

Chapter

4

an incoming call).

Occasionally,

you

may make

use of a special

form

of answer

mode,

called

"reverse

mode,"

which is

used to

initiate a call to

an originate-only

modem

(a 300 baud

acoustic

coupler,

for example).

Changing

between originate and answer

modes

is not something

you need

to worry

about,

because

the mo-

dem makes

the switch automatically.

In normal

operation, the change

from the local command

state to

the

on-line

state

is automatic.

For instance, once

the command

to

dial is

given,

the transition to

the on-line state is

performed auto-

matically

when the connection

to another modem

is

made.

The

on-line state is

also achieved when the

modem answers

a

call.

When

the carrier

is lost, for whatever

reason, the modem auto-

matically returns

to the local

command state.

The

modem will

not respond

to

local

commands when on-line.

If

you wish

to enter

a

command,

you must first return

the modem

to

the

local state. This is

accomplished

by entering the Escape Code.

4.2

Changing of

States

Escape

Code

The escape code is

a message to the modem which

tells it to re-

turn to

the

local state,

allowing

you

to enter commands.

The for-

mat consists

of an

escape guard time and an escape character.

The escape code

does not

drop

the connection with the other mo-

dem; it merely suspends the transmission and reception of

data

over the

line temporarily. The command

to

hang-up, ATH<CR>,

must

be

entered to drop the phone line.

4-2