Texas Instruments TTY Communications Mounting instructions

Copyright© 1984 by Texas Instruments Incorporated
All Rights Reserved -- Printed in U.S.A.
The information and/or drawings set forth in this document
and all rights in and to inventions disclosed herein and patents
which might be granted thereon disclosing or employing the
materials, methods, techniques or apparatus described herein
are
the exclusive property of Texas Instruments Incorporated.
No copies of
this information or drawings shall be made with-
out the prior consent of Texas Instruments Incorporated.
TTY Communications
TI Part No. 2236856-0001
Original Issue: June 1984

Preface
The TTY Communications manual describes how to use your
Texas Instruments Professional Computer to communicate
with another computer using TTY protocol. Although this
manual is written for someone who has never used a computer
to communicate with another computer , you need to read the
Texas Instruments Professional Computer Operating Instruc-
tions. A novice
can bring together all the necessary equipment,
connect it, and run a sample session with this manual. An ex-
perienced
TTY user can also find it useful.
Chapter 1 introduces you to TTY communications. It describes
how communications in general
works and specifically how
TTY works. It also lists all the equipment you need to commu-
nicate
using TTY protocol.
Chapter 2 helps you get your computer ready to communicate .
Chapter 3 describes the various parameters you must set be-
fore you
conduct a TTY session.
Chapter 4 describes the various commands you use to send and
receive information during a TTY session.
Chapter 5 guides you through a sample TTY session, listing all
the necessary steps from plugging in the computer to ending
the session.
Appendix A describes, in depth, how
the TTY protocol works.
This appendix is
intended for the communications professional
who needs
to know how the Texas Instruments Professional
Computer uses
the TTY protocol.
Appendix B lists error messages you may receive during a
TTY session, and gives you information you need to correct the
error.
iii

Appendix C is a quick reference guide for the parameters used
in TTY. The alphabetical listing describes each parameter in
depth .
Appendix D contains instructions on using the Texas Instru-
ments Internal Modem.
Appendix E lists the mnemonics for the control characters.
Appendix F deals with modem considerations.
Appendix G contains the international to national character
cross reference tables.
The glossary defines many of the technical terms used in this
manual.
The index helps
you find information quickly.
Other publications that you may need when you use this man-
ual are as follows.
• Texas Instruments Professional Computer Operating
Instructions (TI Part No. 2238421-0001)
• MSTM-DOS Operating System manual (TI Part No.
2238442-0001)
• Synchronous-Asynchronous Communications Board option
manual (TI Part No. 2223206-0001)
• Internal Modem option manual (TI Part No. 2223256-
0001)
If anything is unclear in this manual, or if you have problems
with your computer, please jot the problems down on one of
the Product Comment Sheets and send it to us.
MS is a trademark of Microsoft, Inc.
iv

Contents
Preface ............................................................................ iii
1 Introduction .............................................................. 1-1
What is "Communications"? ........................................... 1-3
Necessary
Equipment ....................................................... 1-5
International Environment .............................................. 1-8
2 Getting Ready ...... ......................... .......... ................ 2-1
Introduction ....................................................................... 2-3
Assembling the Equipment .............................................. 2-4
Determining the Configuration ........................................ 2-4
Attaching the Cables ........................................................ 2-9
Loading
the Software ..................................................... 2-13
Preparing Files ................................................................ 2-14
3 Parameter Setup .................................................... 3-1
Starting the Program .. ..................................................... 3-3
First Parameter Display ................................................. 3-11
Second Parameter Display ............................................. 3-16
Third Parameter Display ................................................ 3-21
Programmable Keys Display......................................... 3-24
Character Replacement ................................................... 3-25
Summary .............. .. .......................................................... 3-26
4 Running a Session ................................................ 4-1
Introduction .................................................... .. ................. 4-3
Connection ......... .. .............................................................. 4-3
Communicating .. ....................... .. ...................................... 4-9
Terminating ..................................................................... 4-25
Automatic Control .......................................................... 4-26
Remote
Commands ..................... .. . .. ............................... 4-27
Summary .......................................................................... 4-31
v

5 Sample TTY Session .......................................... 5-1
Introduction ....................................................................... 5-3
General Description .......................................................... 5-3
Connect .............................................................................. 5-3
Assemble ............................................................................ 5-4
Set Up ................................................................................ 5-5
Establish Connection ........................................................ 5-7
Send/Receive Files ............................................................. 5-8
Terminate Communications ........................................... 5-11
Appendixes
A TTY In Depth
B Error Codes
C Parameter Guide
D Using an Internal Modem
E Key Mnemonics
F Modems
G International to National Character
Cross Reference
vi
Glossary
Index

1
Introduction
What is "Communications"? ....................................... 1-3
How Data Communications Works ...................................... 1-4
How TTY Communications Works ....................................... 1-4
What TTY Does ..................................................................... 1-5
Necessary Equipment ..................................................... 1-5
International Environment .......................................... 1-8
1-1/1-2

WHAT IS "COMMUNICATIONS"?
The Texas Instruments Professional Computer functions as an
independent computer. You can enter, store, process, and dis-
play
data without using another computer. However, you may
want to connect your Texas Instruments Professional Com-
puter, shown in the following figure, to another computer to
send or receive data. This transfer of information between com-
puters is called data communications.
2223127-2
1-3

How Data Communications Works
If you want to communicate with someone, the two of
you
must agree on some aspects of communication be-
fore you
start. First, you must agree to speak a lan-
guage that you both understand. Second, you must
speak at the proper time because you want to speak
only when
the other person listens. Third, you must ar-
range for the method of communication: in person, by
telephone, or by letter.
In data communications, you face these same issues
when you
want two computers to communicate. They
must speak a common "language," speak and listen at
the proper time, and communicate with the proper
equipment. In data communications, languages called
communications protocols deal
with these issues.
How TTY Communications Works
1-4
TTY (Teletypewriter) is one of many different protocols.
Protocols
are generally divided into two types: syn-
chronous
and asynchronous.
In synchronous protocols, data is sent in large blocks.
You
can place the data in queues, so that the communi-
cations line will not be idle very long . Because data can
be sent in large blocks and in rapid succession, a syn-
chronous protocol is
very efficient. Synchronous proto-
cols are
best suited for applications needing to send
(and receive) a
lot of information on a regular basis.
An asynchronous protocol, such as TTY, sends the data
one character at a time. TTY cannot place data into
queues. TTY is
best suited for applications that require
relatively small
amounts of information and at irregular
intervals. TTY is suited for applications that require
the two computer operators to interact.

What TTY Does
The TTY communications software has the following
features.
• Sends or receives data in most standard speeds up
to 9600 bits per second. That is about 44 double-
spaced typewritten pages of text per minute .
• Operates under manual or remote control, so your
computer can communicate with or without your
presence.
• Restarts from abnormal communication line condi-
tions automatically, so an unattended computer
can reattempt an interrupted session.
• Provides automatic telephone calling or answering,
if you
have a Texas Instruments internal modem.
• Features programmable keys, which save time by
reducing lengthy character sequences to short key-
strokes.
NECESSARY EQUIPMENT
To communicate using TTY, you need the following equipment.
Chapter 2 describes each piece of equipment and shows you
how to find out if each piece is installed.
• Texas Instruments Professional Computer, equipped with
at least one diskette drive
• MS-DOS diskette (in MS-DOS Operating System manual)
• Diagnostic diskette (in Texas Instruments Professional
Computer Operating Instructions), so you can determine if
you have the necessary options
1-5

• TTY communications diskette
•
Expansion random-access memory (RAM) board - 64K
bytes
• Synchronous-asynchronous communications board (sync-
async comm board) or Texas Instruments internal modem
• Communication link, which consists of the following.
Communication lines
Modems (optional)
Telephones (optional)
Communication cables
1-6

The following figure shows a typical arrangement of this com-
munications equipment.
D
= co =
Df!IIIIIIIIIIIIIIIIIIII~mB
D
= co =
Dl!IIIIIIIIIIIIIIIIIIII~mB
2223127-1
1-7

INTERNATIONAL ENVIRONMENT
The modems, which can be used with your computer , will vary
depending on the country. For example, direct connect modems
are not allowed in certain countries.
• External Bell modems (Bell 103, Bell 212) can only be
used in the USA and Canada .
• In European countries, Comite Consultatif International de
Telegraphique
et Telephonique (CCITI) compatible modems
must beused. For example:
CCITT V.21, 300 bps, full-duplex
CCITT V.22, 1200 bps, full-duplex
• Texas Instruments internal modems may not be approved
by the Telecommunications Regulatory Agency of your
particular country. Appendix D contains more details on
internal modems and their restrictions .
Appendix F contains more information on available modems.
1-8

2
Getting Ready
Introduction ......................................................................... 2-3
Assembling the Equipment ........................................... 2-4
Determining the Configuration ................................... 2-4
Attaching the Cables ....................................................... 2-9
Direct-Connect Link .............................................................. 2-10
Dedicated Link ....................................................................... 2-11
Switched Link ........................................................................ 2-12
Loading the Software .................................................... 2-13
Preparing Files ................................................................. 2-14
2-1/2-2

INTRODUCTION
This chapter gives you a step-by-step procedure to get your
computer ready to communicate in TTY protocol. Because you
may have already completed some of these steps when you set
up your computer, it may not be necessary to perform the
whole procedure. To find out where to start, answer the ques-
tions below.
1. Are the country specific keyboard and the display unit
connected to the system unit? If they aren't, start at the
section entitled "Assembling the Equipment" in this
chapter.
2. Do you know if you have all the necessary equipment and
options? If you don't, start at the section entitled "Deter-
mining the Configuration" in this chapter.
3. Do you know what type of communication link you have?
Are all the communications cables attached? If not, start
at the section entitled "Attaching the Cables" in this
chapter.
4. Have you turned on the system, loaded MS-DOS, and
loaded the communications diskette? If you haven't done
all of these, start at the section entitled "Loading the
Software" in this chapter.
5. Do you know the names of the files you want to send or
receive during the session? If not, start at the section en-
titled "Preparing Files" in this chapter.
If you answered "yes" to all of these questions, skip to Chap-
ter 3.
If at any time the equipment doesn't do what this manual says
it should, consult the list of error codes in Appendix B. If the
information there doesn't help you, consult the Texas
Instruments Professional Computer Operating Instructions.
Then, if necessary, call a Texas Instruments Authorized
Dealer.
2-3

ASSEMBLING THE EQUIPMENT
Make sure your equipment is properly cabled, as shown in the
following figure. If it isn't, refer to Chapter 2 in the Texas
Instruments Professional Computer Operating Instructions to
find out how to set up your computer.
2223116-13
DETERMINING THE CONFIGURATION
Determining the system configuration involves finding out
what options are installed in your computer. You need the fol-
lowing information about your computer before you can begin
communicating with another computer.
• Is a sync-async comm board installed in the system unit?
• Is a Texas Instruments internal modem installed in the
system unit?
2-4

• What is the port number of your sync-a sync comm board
or internal modem? (We explain port numbers later in this
chapter .)
• Is an expansion RAM board installed in the system unit?
To obtain this information, follow the procedure below. This
procedure requires the diagnostics diskette, which is included
with the Texas Instruments Professional Computer Operating
Instructions. The diagnostics diskette contains software that
lists the installed options and locates malfunctions in your
computer.
1. Insert the diagnostics diskette into diskette drive A (the
drive
on the left). Close the diskette-drive door.
2. Place the system unit ON/OFF switch in the ON position.
Wait 10 to 35 seconds until the main diagnostics menu
appears on the display, as shown below.
Texas Instruments Professional Computer DIAGNOSTICS
Version 1.45 (C) Copyright Texas Instruments, Inc. 1983
Overall Unit Test Yes No
Memory Test Yes No
CRT Test Yes No
CRT Graphics Test Yes No
Parallel Printer Test Yes No
Keyboard Test Yes No
Diskette Verify Test Yes No
Diskette Read/Write test Yes No
Communication Port(s) Test Yes No
Winchester Format/Surface Analysis test Yes No
Winchester Checkout/Verify test Yes No
Display System Configuration Yes No
Print Test Results Yes No
Select appropriate test(s) and press ENTER ...
2-5

A computer menu is like a restaurant menu. Instead of offering
you a choice of foods, however, it offers you a choice of func-
tions
your computer can perform at that time.
Different versions of
the diagnostics (with different menus)
exist. Therefore,
your main diagnostic menu may be slightly
different from the previous example. However, all the versions
have the test you run next.
3. Select "No" for every test except the Display Configura-
tion
Test. To select either a "Yes" or "No" value, use the
cursor-control keys (Left Arrow, Right Arrow, Up Arrow,
and Down Arrow to position the cursor over the value you
want, and then press the RETURN key. When you have
selected the Display System Configuration Test, press the
ENTER key (on the numeric keypad).
NOTE
Throughout this manual, the word "press" means to
momentarily push down a key and then release it.
"Press and hold" means to push down a key and
hold it down while performing some other stated ac-
tion (similar to typing an uppercase character using
the SHIFT key on a standard typewriter). Lastly,
"type" means to type whatever we specify, letter by
letter.
During the Display System Configuration Test, your computer
scans itself to determine the amount of memory it has and
what options are installed. Because your computer can have
many different configurations (combinations of options), your
display may differ from the following example.
2-6