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.