Tandy 1400LT User manual

Cat. No. 25-3510
1200 bps Modem
For Tandy 1400 LT
User's Manual

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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 aModem? 1-1
1.2 Make aCall or Answer 1-2
1.3 Use Your Modem with aDatabase 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 t3.3
Chapter 4
Introduction to Modem Operation
4.0 Direct Entry into the 1200 BPS Internal Modem
Command Mode 4_1
4. 1Functional 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 aRegister 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 AAdd-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) Amodular telephone cable.
3) This manual, which provides complete installation and oper-
ating instructions.
1.1 What is aModem?
Amodem 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. Amodem
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 aCall 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 acall. 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 acall comes in, your
modem will answer. (If you expect to be receiving many data calls,
it's agood 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 amodem or ahuman at the other end!)
1.3 Use your Modem with aDatabase
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 2includes complete installation instructions.
1-3

Chapter 1
Chapter 3covers 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
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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 screws -
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 3for 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