Ibm 5100 Setup guide

---

-

----

---

--

-

---

-----

-

...

-

---

-----

--_.-

(/

IBM 5100

Communications/Serial I/O

Maintenance Information Manual ,...

It)

Preface

This manual

is

for personnel who service the

IBM

5100

Portable Computer Communications. Adapter feature,

Serial I/O Adapter feature, or both. To use this manual,

you should know how

to

operate the 5100 with the Com-

munications Adapter feature, Serial

I/O

Adapter feature, or

both.

It

would also

be

helpful if you understand basic tele-

processing concepts.

Related Publications

•

IBM

5100 CommunicationsAdapterFeature User's

Manual, SA21-9215

•

IBM

5100

Serial//O

Adapter

Feature User's Manual,

SA21-9239

•

IBM

5100

Maintenance Information Manual,

SY31-0405

Third Edition (October 1976)

This is a

minor

revision

of

SY31-0429-1 incorporating changes released in the

following

technical newsletters: SN31-0467 (dated 1 May 1976) and SN31-0478 (dated 12

July

1976). Changes are

periodically

made

to

the specifications herein; any such change

will

be reported in subsequent revisions

or

technical newsletters.

A

form

for

readers' comments

is

provided at the back

of

this

publication.

If

the

form

has

been removed, comments

may

be

addressed

to

IBM

Corporation,Publications,

Department

245,

Rochester, Minnesota

55901.

Comments become

the

property

of

IBM.

©International Business Machines Corporation

1975;

1976

.

'.

,

o

b'

Contents

( ,

I'

:l

HOW

THIS

MANUAL

IS

ORGANIZED

iv

Expansion Feature Card Transmit Operation 2-17

Expansion Feature Card Receive Operation 2-17

(

INTRODUCTION

1-1

Communications

Transmit

Interrupt

2-18

Expansion Feature

1-1

Receive

Interrupt

2-18

i Communications Adapter Feature

1-1

Error

Detection . 2-18

Serial

I/O

Adapter

Feature.

1-1

Parity Errors 2-18

Start

Bit

Errors 2-18

THEORY

OF

OPERATION

2-1

Stop

Bit

Errors 2-18

,.

Communications Microprograms and Data

Flow

2-1

(

Transmit.

2-2

DIAGNOSTIC

AIDS

3-1

Receive 2-2 Communications Diagnostic

Buffer

3-1

Serial

I/O

Microprograms and Data

Flow

2-3 Displaying the Diagnostic

Buffer

3-1

Transmit

Operation.

2-4

CE

Display 3-3

Receive Operation 2-4 Extended Display 3-3

Data

Format

. 2-5

Network

Analysis Subroutine 3-4

5-Bit

Code 2-5 Operating Instructions . 3-5

6-Bit

Code 2-5

How

Data

is

Accumulated 3-7

7-Bit

Code 2-5 Displays 3-7

8-Bit

Code 2-5 Communications/Serial

I/O

Troubleshooting Guide 3-13

Communications

Control

Characters 2-7

Communications

Function

Characters 2-8

COMMUNICATIONS

NETWORKS

4-1

Shift

Function

Characters . 2-8 Switched

Networks

. 4-2

Backspace

Function

Character 2-8 Nonswitched Networks 4-2

Tab

Function

Character 2-8 Common Terms . 4-2

Bypass and Restore

Function

Characters 2-8 Data Set Functions . 4-3

(

New·Line

and Line Feed

Function

Characters 2-9

Communications Data Set

EIA

Interface 2-11

APPENDIX.

CHARACTER

CODE

CHARTS

5-1

Serial

I/O

Device

EIA

Interface 2·11 Communications Code Chart 5-2

Modem Mode

2·12

Code Chart

of

Function

and Control Characters 5-2

Ignore Mode . 2·13 Code Chart

for

EBCD Data Characters 5-3

Terminal Mode 2-13 Code Chart

for

Correspondence Code Data

Set

Mode.

2-15 Characters 5-4

Expansion Feature Card 2-15 Serial

I/O

Character Code Charts 5-4.1

Addressing 2-15 Serial

I/O

5-Bit

Character Chart 5-5

Control Strobe 2-15 Serial

I/O

6-Bit

Character Chart 5-6

Put Strobe 2-16 Serial

I/O

7-Bit

Character Chart 5-8

Start Execute 2-16

INDEX

X-1

(

Contents

iii

iv

How

This Manual

Is

Organized

Because the Communications Adapter feature and the Serial I/O Adapter feature are sim-

ilar, both features are explained

in

this manual.

The main sections

of

the manual and what each explains

is

as

follows:

• Introduction explains

the

similarities and

the

major differences between

the

two

features, what each feature consists of, and

the

function of each feature.

• Theory

of

Operation explains the microprograms and data flow of each feature, the

data format

used

with both features, the EIA (Electronics Industry Association)

RS232C/CCITT V.24-V.28 standard interface lines

that

both features use, and how

the expansion feature card functions

in

both transmit and receive operations.

• Diagnostic Aidstells what diagnostic aids are available for communications and serial

I/O. This section also contains instructions on how

to

use the diagnostic buffer and

network analysis routine for communications, and contains a troubleshooting guide

for communications and serial I/O.

• Communications Networks explains some

of

the

basics

of

data communications

that

apply

to

the

IBM

5100 Portable Computer.

• Appendix. Character

Code

ChartB

shows

the

character codes and

the

character

bit

values

that

are used by botn features.

,

(:

(

The Serial I/O Adapter feature,

the

Communications

Adapter feature,

or

both,

can be installed

on

the

5100

Portable Computer.

The similarities

of

the

communications and serial I/O

Adapter features are:

• They both

use

the

EIA (Electronics Industry Associa-

tion) RS232C/CCITT V.24-V.28 standard interface

to

connect

the

5100

to

a data set

or

an I/O device.

• They

both

use

the

same logic card (B2).

•

They

both use microprograms in read/write storage.

The major differences between

the

two features are:

• The APL or BASIC language

is

active with

the

Serial I/O

Adapter feature and a user written APL or BASIC pro-

gram interacts with

the

serial I/O program. The APL or

BASIC language

is

not

active with the Communications

Adapter feature.

•

The

features use a separate

connector

on

the

rear panel

of

the

5100.

EXPANSION FEATURE

The expansion feature

is

a prerequisite for

the

Communica-

tions Adapter feature,

the

Serial I/O Adapter feature, or

both.

The expansion feature

is

the

expansion feature card

(B2).

Introduction

COMMUNICATIONS ADAPTER FEATURE

The Communications Adapter feature enables

the

IBM

5100

Portable Computer

to

communicate with a remote

system. The

5100

appears

the

same

as

an

IBM

2741 Com-

munication Terminal

to

the

remote system. The

5100

can

transmit

data from

the

keyboard

or

tape

unit, write trans-

mitted or received data

on

tape,

or

print

transmitted

or

received data.

The

Communications Adapter feature consists

of

internal

and external cables, and

the

communications program (the

expansion feature

is

also required).

The

communications

program, which consists of

the

communications micropro-

gram,

the

communications I/O microprogram, and

the

printer microprogram,

is

stored

on

tape

and

must

be

loaded into read/write storage before using

the

feature.

For detailed information

on

loading

the

communications

program and using

the

feature, refer

to

the

IBM

5100

Communications

Adapter

Feature User's Manual.

SERIAL I/O ADAPTER FEATURE

The Serial I/O Adapter feature allows a user

to

attach

I/O

devices other

than

the

5100

I/O devices

to

the

5100

Portable

Computer.

The Serial I/O Adapter feature consists

of

internal and ex-

ternal cables, and

the

serial I/O program (the expansion

feature

is

also required). The serial I/O program, which

consists

of

the

serial I/O microprogram and

the

serial I/O

input/output

microprogram,

is

stored

on

tape

and

must be

loaded into read/write storage before using

the

feature.

For an explanation

of

how

to

load and use

the

serial I/O

program, refer

to

the

IBM

5100

Serial

I/O

Adapter

Feature

User's Manual.

Introduction

1-1

1-2

(

COMMUNICATIONS MICROPROGRAMS

AND

DATA

FLOW

The

following

diagram shows the location

of

the micro·

programs and the data

flow

for

a communications transmit

and

receive operation. Refer

to

this diagram while reading

the description

of

the microprograms and data

flow.

ReadIWrite Storage

Theory Of Operation

'-

_~_:_~_~_~_e_d

____

~~

,fl

-~~

__

~_c_i~r_~~~~;y;;~::::::::~

____

~~::::::::::~

..

I

r-"-

Executable ROS

Communications

~

_

I/O

Supervisor

Printer

-CJ

Printer

Microprogram

(option

2

or

4)

",,-

-

Microprogram

Communications

_

Communications.

r-

Microprogram

Diagnostic

I/O

Subroutines

Buffer

..

-

Microprogram

foe-

+

Expansion

Feature

Card

_ Data

Set

During communications, the IBM 5100 Portable Computer

functions

as

a communications terminal, and normal

APL

and

BASIC language operations cannot

be

performed.

During communications, the 5100

uses

microprograms in

read/write storage and microprograms and subroutines in

executable ROS.

The microprograms in read/write storage

that

are

used

during communications

are

the communications micro·

program, the communications I/O microprogram, and the

printer microprogram

(used

only

when

option

2

or

4

is

selected).

--r"

I

Microprogram

-I

(option

1

or

3)

I

.~

l.

Tape

Microprogram

-

(option'

or

3)

.~

'---

Keyboard

Microprogram

Receive

--

---

Transmit

------

Theory

Of

Operation

2·'

The microprograms in executable ROS

that

are used during

communications are:

•

The

printer,

tape,

keyboard, and I/O supervisor (these

,are also used in normal APL and BASIC operations).

•

The

microprogram subroutines (these are used only by

the

communications I/O microprogram).

The microprograms

in

read/write storage are loaded from

the

communications tape; however,

the

printer microprogram

is

loaded only when option 2

or

4

is

selected. During APL

or

BASIC operations,

or

if

option

1

or

3

is

selected,

the

printer

microprogram

in

executable ROS

is

used for printer opera-

tions. Refer

to

the

IBM

5100

Communica..tions

Adapter

Feature

User's

Manual for a description of

the

options.

The

communications microprogram controls

the

format

of

the

data printed and written

on

tape,

stored in

the

extended

display, and displayed

on

the

screen. It also adds

the

line

control and function characters,

and

transfers data

to

or

from

the

communications I/O microprogram.

Transmit

During transmit operations,

data

can be supplied from

the

keyboard,

the

extended

display,

or

a tape. The communica-

tions I/O microprogram converts

the

data

to

EBCD

(extended

binary coded decimal)

or

correspondence code characters,

places

the

character

in

the

communications diagnostic

buffer, serializes each character, adds start and

stop

bits, and

sends

the

character

to

the

expansion feature card one bit

at

a time.

The operating sequence

of

the

microprograms and

the

data

flow

is

as follows:

1. A key

is

pressed on

the

keyboard

or

a character

is

read from tape.

2.

3.

4.

2·2

The keyboard

or

tape

microprogram

in

executable

ROS passes

the

data from

the

keyboard

or

tape

to

the

I/O supervisor.

The I/O supervisor passes

the

data

to

the

communi-

cations microprogram.

The communications microprogram places

the

character (if it

is

a data character)

in

the

extended

display and

on

the

display screen.

If

the

5100

is

transmitting and

the

character was entered from

the

keyboard, it

is

passed

to

the

communications I/O

microprogram.

If

the

character was read from

tape

or

the

5100

is

in

the

edit

state,

the

character

is

not

passed

to

the

communications I/O microprogram until

a complete line

is

read from tape

or

until

the

EXE-

5.

CUTE

or

ATTN key

is

pressed. The data

is

then

read

from

the

extended display; control

and

function

characters are added;'and

the

data

is

passed

to

the

communications I/O microprogram one character

at

a

time

.

The communications I/O microprogram, with

the

use

of

the

microprogram subroutines in executable ROS,

converts

the

character

to

EBCD

or

correspondence

code; places

the

character

in

the

diagnostic buffer;

adds

the

start

and

stop

bits; and sends

the

character,

bit

by

bit,

to

the

expansion feature card. The bits

sent

to

the

card are

then

sent

to

the

data

set and trans·

mitted

to

the

remote system.

Receive

All

data received by

the

5100

is

stored in

the

extended dis-

play, displayed on

the

screen, and printed

and/or

written

on

tape.

The

communications I/O microprogram removes

the

start

and

stop

bits from each character, deserializes

the

char·

acter, places

the

character

in

the

communications diagnostic

buffer, converts

the

character

to

EBCD

or

correspondence

code and sends it

to

the

communications microprogram.

The operating sequence

of

the

microprograms and

the

data

flow when

the

5100

is

receiving is:

1. Bits from

the

data set are sent

to

the

expansion

feature card.

2.

3.

4.

5.

6.

The expansion feature card sends

the

bits

on

bus

in

to

the

communications I/O microprogram.

The communications I/O microprogram assembles

the

bits into EBCD

or

correspondence code characters,

updates

the

communications diagnostic buffer with

the

characters, and passes control

to

the

communica-

tions microprogram.

The communications microprogram updates

the

display screen and extended display,

then

waits for

the

If

option

2

or

4

is

selected,

the

data

is

printed when a

line feed

or

new·line function character

is

received.

If

option

1

or

3

is

selected,

the

data

is

stored

in

the

extended display until a new-line character and

the

end

of

transmission character ( ©)are received,

then

printed

or

written

on

tape.

The data flow from

the

extended display

to

the

printer or

tape

is

controlled by

the

communica-

tions microprogram,

the

I/O supervisor, and

the

tape

and printer microprograms.

",,---

/

(

~-

(

(-

SERIAL

I/O MICROPROGRAMS AND DATA FLOW

The

following diagram shows

the

location

of

the

serial I/O

microprograms

and

the

data

flow

for

a serial I/O

transmit

and receive

operation.

Refer

to

this

diagram while reading

the

description

of

the

microprograms

and

data

flow.

I Display

I Screen

\

ReadlWrite Storage Executable ROS

User's

APL

or

BASIC

I/O

Program Supervisor

I/O

Buffer

Serial

I/O

I I

Microprogram

Serial

I/O

APL

and

Input/Output

BASIC

Micro-

Microprogram program

Sub-

routines

r--

Printer

Microprogram

L Tape

Microprogram

-Keyboard

Microprogram

Nonexecutable ROS

Expansion

Feature

Card

APL

and BASIC

~

Interpreters

-

Serial

I/O

Device

During serial I/O operations,

the

5100

uses programs

in

read/write sto.rage, executable ROS, and nonexecutable

ROS.

The

programs

in

read/write storage are

the

user's APL

or

BASIC program,

the

serial I/O microprogram, and

the

serial I/O

input/output

microprogram.

The programs

in

executable ROS are

the

printer,

tape,

keyboard,

and I/O supervisor microprograms. The APL

and

BASIC microprogram subroutines

in

executable ROS

are also used during serial I/O operations.

5103

Printer

~

Tape

"'-

5100

Keyboar(l

Theory

Of

Operation 2-3

The programs

in

nonexecutable

ROS

are

the

APL and

BASIC interpreters.

The microprograms

in

executable and nonexecutable ROS

function

the

same

in

serial I/O operations as they

do

in

normal APL

or

BASIC language operations.

The serial I/O microprograms

in

read/write storage are

loaded from

the

serial I/O adapter tape cartridge.

The serial I/O microprogram sets the device characteristics

and the request

to

send and clear to send controls as speci-

fied by the user. (See the

IBM

5100

Serial

I/O

Adapter

Feature User's Manual for

an

explanation

of

how these de-

vice characteristics are set., This microprogram aiso controis

the data flow into and

out

of

the I/O buffer

in

read/write

storage. The size

of

the

I/O buffer

is

set by the serial I/O

microprogram as specified

by

the

user. (See

the

IBM

5100

Serial

I/O

Adapter Feature User's Manual for more

information

on

the I/O buffer.)

During a transmit operation, the serial I/O microprogram

takes

the

data from

the

I/O buffer when the device (output

file)

is

closed

or

when

the

buffer becomes full. This micro-

program also adds control and function characters if neces-

sary, such

as

upper shift function characters, and end-of-

block and end-of-buffer control characters; and sends

the

data

to

the

serial I/O

input/output

microprogram one

character

at

a time.

During a receive operation, the serial I/O microprogram

puts

the

data

in

the I/O buffer

as

it

is

received from

the

I/O device.

Transmit Operation

During a transmit operation, data

is

supplied by

the

user's

APL

or

BASIC program. (During

BASIC

language opera-

tions, the user can transmit a BASIC program

to

the

I/O

device with

the

SAVE command.) The serial I/O

input/

output

microprogram converts

the

data

to

the specified

code (5-,6-,

7-,

or

8-bit). adds

the

start and stop bits,

serializes each character, and sends

the

character

to

the

expansion feature card one bit

at

a time.

The operating sequence

of

the microprograms and the data

flow during a transmit operation is:

1.

A data character

is

entered from

the

keyboard

or

read from tape.

2.

2-4

The keyboard

or

tape microprogram passes

the

data

character

to

the

I/O supervisor.

3.

4.

5.

The I/O supervisor passes

the

data character

to

the

I/O buffer

in

read/write storage

via

the

APL

or

BASIC microprogram subroutines, which use

the

programs

in

the

APL

or

BASIC interpreters.

When

the

user's program specifies

output,

the

serial

I/O microprogram removes the data from the I/O

buffer

via

the

I/O supervisor and APL

or

BASIC

microprogram subroutines; adds any necessary func-

tion and control characters; and passes

the

data

to

the

serial I/O

input/output

microprogram.

The serial I/O

input/output

microprogram converts

the character

to

the

specified code, serializes

the

character, adds start and stop bits, and sends the char-

acter, bit by bit,

to

the

expansion feature card. The

bits sent

to

the

card are transmitted

to

the

serial I/O

device on

the

transmitted data line.

Note: Steps 1, 2, and 3 are

the

same

as

a normal APL

or

BASIC language operation. The data could also be supplied

by

the

user's APL

or

BASIC program, such

as

the

result

of

calculations.

Receive Operation

DUring

a receive operation, data received from an I/O device

is

sent

to

the

user's APL or BASIC program by

the

serial

I/O microprograms;

the

user's program may use

the

data

or

send it

to

the

5100

output

devices. (In BASIC language

operations,

the

user can receive a BASIC program from

the

I/O device with

the

LOAD

command.)

The operating sequence

of

the microprograms and

the

data

flow during a receive operation

is:

1.

2.

3.

4.

5.

The

5100

receives

the

data from

the

I/O device on

the received data line

via

the

expansion feature card.

The card sends

the

data, bit by bit,

to

the

serial I/O

input/output

microprogram on bus in.

The serial I/O input/output microprogram deserializes

each character, removes

the

start and stop bits, con-

verts

the

character

to

5100 code, and sends

the

char-

acter

to

the

serial I/O microprogram.

The serial I/O microprogram places the character

in

the

I/O buffer via the APL or BASIC microprogram

subroutines and

the

I/O supervisor.

The user's program uses

the

data

or

sends it

to

the

5100

I/O devices

via

the

APL

or

BASIC micropro-

gram subroutines and

the

I/O supervisor as

in

a normal

APL

or

BASIC operation.

"

(

DATA FORMAT

The

5100

uses the start-stop format for

both

the

communi-

cations and serial I/O features.

In

the

start-stop format,

each character

is

synchronized separately

on

the

data line.

To synchronize each character, a ST (start) bit

is

added

to

the

beginning

of

the

character and a SP (stop) bit(s)

is

added

to

the

end

of

the

character. The data bits transmitted be-

tween

the

ST and SP bits can

be

anyone

of

the

codes used

with

the

5100

communications

or

serial I/O feature, be-

cause

the

ST and SP bits, respectively, indicate

the

begin-

n

ing

and end

of

a character.

The code used with

the

communications feature

is

EBCD

(extended binary coded decimal)

or

correspondence code.

Tha code used with

the

serial I/O feature

is

5-,6-,

7-,

or

8-bit code.

5-Bit Code

Each 5-bit character contains 5 data bits labeled 1, 2,

3,

4, and 5. There are no parity bits with

the

5-bit code.

The 5-bit code

is

compatible with I/O devices

that

use

the

Baudot code.

Additional characters are obtained by preceding

the

code

with a letters (lower) or figures (upper) shift character.

If

the

characters are preceded by a letters character,

the

characters are letter (lower) shift characters.

If

the

charac-

ters are preceded by a figures character,

the

characters are

figure (upper) shift characters. For more information

on

letter and figure characters, see

the

IBM

5100

Serial

I/O

Feature User's Manual.

6-Bit Code

Each EBCD, correspondence code,

or

6-bit character con-

tains 7 bits, which are labeled

B,

A, 8, 4, 2, 1, and

C.

Bits

B,

A, 8, 4, 2, and 1 are data bits and indicate different

characters by using a different combination

of

bits for

each character. Bit C

is

a check bit (parity bit) and

is

used

to

maintain odd parity of each character for error checking

purposes. The 6-bit code

is

compatible with I/O devices

that

use

the

EBCD

or

correspondence code.

Additional character combinations are obtained by pre-

ceding a character

or

characters with a shift function char-

acter. For example, if

the

characters ABCD are preceded

by

an upper shift function character,

the

characters ABCD

are upper shift characters. For more information

on

shift

function characters during communications operations,

see

Shift

Function Characters and Communications Diag-

nostic Buffer. For more information

on

shift function char-

acters during serial I/O operations, see

the

IBM

5100

Serial I/O Feature User's Manual.

7-Bit Code

Each 7-bit character contains 8 bits, which are labeled

P,

1,2,3,4,5,6,

and 7. Bits

1,2,3,4,5,6,

and 7 are data

bits and bit P

is

a parity bit. The parity

of

a 7-bit character

can be odd, even,

or

ignored

as

specified

by

the

user. When

the

ignore

option

is

specified,

all

7-bit characters

that

the

5100

transmits

to

the

I/O device have

the

parity

bit

turned

off

(space level); and

on

all 7-bit characters

that

the

5100

receives from

the

I/O device,

the

parity bit

is

ignored. The

7-bit code

is

compatible with I/O devices

that

use ASCII

(American Standard Code for Information Interchange).

8-Bit Code

Each 8-bit character contains 8

data

bits (no parity bits),

which are labeled 0,

1,2,3,4,5,6,

and 7. The 8-bit

code

uses

the

hexadecimal format

00

through FF.

See

the

Appendix, CharacterCode Charts for

the

bit for-

mats and character graphics for

the

EBCD, correspondence,

5-,

6-, and 7-bit codes.

Theory

Of

Operation 2-5

The presence

of

a data bit on

the

received data

or

trans-

mitted data line

is

indicated

by

a mark; a mark

is

a minus

(-)

voltage level

(-3.0

to

-25.0V).

The absence of a data

bit

is

indicated by a space; a space

is

a plus

(+)

voltage

level

(+3.0

to

+25.0V). The following graph shows how

the

character A would look

on

the

data line

in

each code with

the

ST and SP bits added:

First Bit

Transmitted Increasing Time

Space +

ST

2

Mark-

n

--------'

~

3 4

5-Bit Character A (bits 1 and 2)

No

Parity

Space + ST B A 8 4

Mark -n

5

2

SP

1-1/2 I

. I

Bits I

I I

C

LJl

EBCD

or

6-Bit Character A (bits

B,

A,

and

1)

Odd Parityl

Space + ST 7 6 5 4 3 2

Mark-

n I

---+---1

U

7-Bit Character A (bits 7 and 1) Even Parity

Space + ST 7 6 5 4 3 2

8-Bit Character A (bits

7,6

and 0) No Parity

SP

Last Bit

Transmitted

•

1

For

Correspondence code,

the

bit value

is

B,

4, 2, 1,

and

C,

(see Code Chart

for

Correspondence

Code Data Characters!'

2Can have

two

SP bits if specified by

the

user.

2-6

(

COMMUNICATIONS CONTROL CHARACTERS

~ages

are

indicated~

two

line control characters:

® (circle D) and

\.S)(circle

C). A @

~ates

the

start

of

a message,

or

start

of

transmission; a

~indi

cates

the

end

of

a message,

or

end

of

transmission. These

characters are transmitted by

the

5100

and by

the

remote

system

as

shown

in

the

following diagram (the arrow indi-

cates

the

direction

of

data flow):

Action

The lines 'clear

to

send' and

'data

set

rdy'

are activated

by

the

data set, which

is

indicated

by

the arrow

on

the status line

of

the

display screen pointing up

t.

IBM

5100

Remote System

The

5100

waits approximately 1 second

after 'clear

to

send' and 'data set rdy'

become active, then sends

the

first mes-

sage

to

the remote syste

m.

©

...

data@l

>

-=-----=--

The

5100

waits for the remote system

to

send a message.

The remote system responds.

<,..--_@=--D_dat_a

..

_.©=_

After a 66-millisecond delay,

the

5100

changes

to

the transmit state, and trans-

mits

the

next message. ©

...

data@

>

~-------,

1 The ®

is

transmitted by the communications pro-

gram immediately after

the

approximate 1-second delay,

which

is

indicated by the arrow on

the

status line chang-

ing

from up

(t)

to

right

(~).

If

the

remote system does

not

respond

to

a message from

the

5100

or if one of

the

control characters

is

lost (be-

cause

of

line noise or some

other

reason)

the

5100:

• Remains

in

the receive state until a ©or @

is

received.

•

Ign~res

all

data characters until a ©

or

a ®

is

received.

•

Re~s

in

the receive

state

if

a @

is

received

but

no

~

is

received. (Any data received

is

stored

in

the

extended display

but

is

not

printed

or

written

on

tape.) The

5100

leaves the receive

state

when either

the

ATTN key

is

pressed (which transmits a receive inter-

rupt

to

the

remote system) or

the

CM

D and A

TIN

keys are pressed (which causes

the

5100

to

go

to

the

transmit

state

and send a @

).

(- • Goes

to

the transmit state when a ©

is

received be-

" fore a @. Any data characters received before

the

©

is

received are lost.

(',

Theory

Of

Operation 2-7

COMMUNICATIONS FUNCTION CHARACTERS

Function characters are special characters

that

the

5100

and

the

remote system use during communications

to

control specific functions. These characters, their func·

tion, and their bit values, are shown under Code Chart

of

Function and Control Characters

in

the Appendix, Char-

acter Code Charts.

Following

is

a more detailed explanation

of

the

function

characters

that

apply

to

the 5100:

Shift Function Characters

The shift function characters, upper shift (indicated by a

<

in

the

diagnostic buffer) and lower shift (indicated by a

::;

in

the diagnostic buffer) indicate

to

the remote system

and

the

5100

that

the data following

is

upper or lower

shift (see Communications Diagnostic Buffer). For ex-

ample,

ifthe

5100 received:

<ABCDEF::;GHIJK

the characters ABCDEF would be upper shift characters

and

the

characters GHIJK would be lower shift characters

as indicated by

the

preceding shift function character.

Backspace Function Character

A backspace function character (indicated by a

iiin

the

diagnostic buffer) indicates

to

the 5100 and the remote

system

to

backspace one character. For example,

if

the

5100

received:

the

5100

would display the character A, backspace the

cursor, and display the character_ (an upper shift

F)

to

form

the

character

~.

2-8

Tab Function Character

A

tab

function character (indicated by a c

in

the diag-

nostic buffer) indicates

to

the

5100

and remote system

to

tab

to

the

setting. For example,

if

the

5100

received:

ABCD

cEFGH

the display would show:

ABCD

EFGH

The number

of

spaces would depend on where the

tab

was

set.

Bypass and Restore Function Characters

The bypass and restore function characters (indicated by

a

wand

a

:::>

respectively

in

the diagnostic buffer) set and

restore the bypass function on the

5100

when the charac-

ters are received. When the bypass function

is

set, (bypass

function character received) the

5100

does not display or

print data.

If

a tape file

is

open (&OPEN command

is

entered), the data

is

written on tape.

The bypass function

is

used for data security. Characters

entered from the keyboard are sent

to

the

remote system

·and

the

cursor advances with each key pressed.

The

5100

does not transmit the bypass and restore func-

tion characters.

(

New-Line and Line Feed

Function

Characters

A new-line function character (indicated by a G

in

the

diag-

nostic buffer) indicates

the

end

of

a line

of

data and starts

a new line

of

data.

For

example,

if

the

5100

received:

ABCDEGFGHIG

the

display would show:

ABCDE

FGHI

(cursor)

A line feed function character (indicated

by

a

;t

in

the

diagnostic buffer)

is

only received

by

the

5100;

the

5100

does

not

transmit this character.

A line feed function character indicates

the

end

of

a line

of

data

and causes

the

display

to

move

up

one

line

(the

cursor

does

not

move

to

the

left).

For

example, if

the

5100

received:

ABCD;tEFGH;t

(

the

display would show:

ABCD

EFGH

(cursor)

(

(-

NeW-line and line feed function characters also indicate

to

the

5100

to

start

printer

or

tape

output

operations. How-

ever, only complete lines

of

data

are printed

and/or

written

on tape. A complete line

is

data

ending with a new-line

or

line feed function character.

For

example,

if

the

following

message

is

received:

@ABCGDEFGGHI

©

\/

New-Line Characters

the

last line

of

data

(GH

I)

is

not

printed

or

written

on

tape

because it does

not

end with a new-line character; however,

it

is

stored

in

the

extended

display.

Theory

Of

Operation 2-9

If

the

user enters

the

command~

OUTSEL SYS, only

lines received from

the

remote system

that

end with a new-

line

or

line feed function character (complete lines) are

printed

and/or

written. A line

of

data (transmitted

or

re-

ceived data) without a new-line character

is

joined with

the

following line. The following example shows when

data would be printed and/or written

if

the command &

OUTSEL SYS

is

entered and

the

messages are transmitted

as shown:

Note: The arrow indicates the direction'

of

data flow.

5103

Printer

and/or

IBM 5100 Remote System Tape

Output

@0

...

TAP @ >

No

output

<@ STEVE

...

0@ STEVE

@

...

LEM

@ > No

output

<@

PAT

...

0@

MELPAT

©0

...

NOD

@ >

No

output

< @

DAN

...

@

No

output

The

message

DAN

is

stored

in

the

extended display,

but

is

not

printed

or

written because a new-line

or

line feed func-

tion character was not received.

If

communications continue and the extended display

be-

comes full and overflows before a complete line

of

data

is

received,

the

message

DAN

will be lost.

2-10

(transmitted message)

(received message)

(received message without

a neW-line character)

(received message with

a new-line character)

(transmitted message)

(received message without

a new-line character)

(

COMMUNICATIONS DATA SET EIA INTERFACE

The

data set interface between

the

expansion feature card

and

the

data set

is

the

EIA RS232C/CCITT V.24-V.28

standard interface and

is

connected

as

shown

in

the

follow-

ing

diagram:

Base I/O Expansion

Card (F2)

Bus

Out

...

Feature

......

Card

.....

Bus

In

(B2)

...

Device Adr

Bus

...

Control

'+ext horiz

dr'

(from display card)

The

output

EIA lines are turned

on,

and

the

input

EIA

lines are sensed, by

the

communications I/O microprogram.

An

on

signal on an EIA control line

is

indicated by a plus

voltage level

of

+3.0

to

+25.0V. An

off

signal

is

indicated

by a minus voltage

level

of

-3.0

to

-25.0V.

The

function

of

each EIA line and

the

sequence in which

they are

turned

on

or sensed during communications is:

If

the

5100

is

going

to

transmit

data:

1.

2.

3.

4.

5.

The

5100

turns

on

data

terminal ready

to

indicate

that

it

is

ready

to

communicate.

The data set turns on data set ready

to

indicate

that

it

is

ready

to

communicate.

The

5100

turns on request

to

send

to

indicate

that

it

is

ready

to

send

data

to

the

data set.

The

data set turns on clear

to

send

to

indicate

that

it

is

ready

to

send data

to

the remote system.

The

5100

sends

the

data

to

the

data set

on

the

trans-

mitted data line. (See Data Format

in

Theory

of

Operation

.)

line

Name

Data Terminal Ready

Request

to

Send

Transmitted Data

Received Data

Clear

to

Send

Data

Set

Ready

Signal Ground

Protective Ground

If

the

5100

is

going

to

receive data:

No

20

4

2

3

5

6

7

1

Data

Set

1. Data terminal ready and data set ready are

turned

on

as

in

a transmit operation.

2. Clear

to

send

and

request

to

send are

not

used.

3. The

5100

receives

the

data from

the

data set

on

the

received data line. (See Data Format.)

Signal ground provides a

common

ground for

all

circuits.

Protective ground

is

connected

to

the

frame

of

the

5100.

Refer

to

the

IBM

5100

Maintenance Information Manual,

for the communications

connector

and expansion feature

card pin numbers.

SERIAL I/O DEVICE EIA INTERFACE

The

5100

uses

the

EIA RS232C/CCITT V.24·V.28 standard

interface

to

connect

the

I/O devices used with

the

Serial

I/O Adapter feature.

The

EIA lines

on

the

expansion feature card are

turned

on

(output

lines) and sensed

(input

lines)

by

the

serial I/O

input/output

microprogram.

The

control lines are

at

a

plus voltage level when active (on) and a minus voltage

level when inactive (off).

The

acceptable voltage levels

are +3.0

to

+25.0V for an

on

level and

-3.0

to

-25.0V

for an off level. For

the

voltage levels and

the

format

of

the

data

on

the

data

lines (transmitted

data

and received

data), see Data Format.

Theory Of Operation 2·11

When operating

the

serial I/O feature,

the

user can select

one

of

four modes (modem, ignore, terminal, or set).

In

modem

or

ignore mode,

the

5100 functions like a modem

(data set).

In

terminal mode,

the

5100 functions like a

terminal and

in

set mode,

the

5100

can function

as

either

a terminal

or

a modem (either

the

modem cable

or

the

terminal cable can be used

to

attach the I/O device).

Modem Mode

Because

the

5100 operates like a modem (data set) in

modem mode and

the

expansion feature card

is

designed for

communications terminal

operations,

the

line names are

interchanged

at

the

seriai i/O

connector

as

foiiows:

Data terminal ready with data set ready

Request

to

send with clear

to

send

And transmitted data with received data

The

following diagram shows the EIA standard interface

lines

that

are used during serial I/O operations and

the

way

they

are connected

to

the

5100

in

modem mode. Refer

to

the

IBM

5100

Maintenance

Information

Manual for the

serial I/O connector and

Z1

cable socket pin numbers.

Base I/O

Card (F2)

2-12

Bus

Out

--.

....

Bus

In

~

Device Adr Bus

..

Control

+ext horiz dr

Expansion

Feature Card (B2)

'+510 data term

rdy'

'+510 data set

rdy'

'+510 request

to

send'

'+510 clear

to

send'

'+SIO

xmit

data'

'+510 rcvd

data'

'+510 rcvd line

sig

def

Signal ground

Protective ground

Z1

Cable

Socket

\

Serial I/O

Connector Serial I/O Device

I

r------,

J><[

1><1

J><[

L

_____

.J

I

Internal

Cable

0:------,

_.

Data Terminal Ready

Data

Set

Ready

I Request

To

5end

Clear

To

Send

Transmitted Data

Received Data

Received Line

Signal Detector

Signal Ground

Protective Ground

L

_____

,

Serial I/O

Modem Cable

(

The function

of

each EIA line and

the

sequence

in

which

they are turned or sensed during serial I/O operations

in

modem mode

is:

• After the serial I/O program

is

loaded and enabled,

the

5100

turns

on '+SIO data term rdy', which

is

sensed

on

the data set ready line

at

the

I/O device,

to

indicate

that

the

5100

is

ready for serial I/O operations.

•

The

serial I/O device turns

on

data terminal ready,

which

is

sensed on the '+SIO data

set

rdy'

line on

the

expansion feature card,

to

indicate

that

the serial I/O

device

is

ready for serial I/O operations.

Note: The sequence

in

which data terminal ready and data

set ready are activated

is

not

significant.

When the serial I/O device

is

going

to

transmit data

to

the

5100:

1. The serial I/O device turns

on

the

request

to

send

line, which

is

sensed

at

the '+SIO clear

to

send'

line on the expansion feature card,

to

indicate

that

it

is

ready

to

send data.

2. The

5100

then turns

on

the '+SIO request

to

send'

line, which

is

sensed

on

the

clear

to

send line

at

the

I/O device,

to

indicate

that

it

is

ready

to

receive the

data from the I/O device.

3.

The serial I/O device sends the data

on

the transmitted

data line, which

is

received on the '+SIO rcvd

data'

line

at

the expansion feature card.

When the serial I/O device

is

going

to

receive data from the

5100:

1.

The lines data terminal ready and data set ready are

activated the same

as

when

the

I/O device

is

trans-

mitting data

to

the 5100.

2.

3.

The line request

to

send from the I/O device ('+SIO

clear

to

send'

at

the expansion feature card) must

be off. Therefore, the line '+SIO request

to

send'

at the card (clear

to

send

at

the

I/O device) will also

be off.

The

5100

sends the data on

the

'+SIO

xmit

data'

line and

the

data

is

received

on

the received data line

at

the I/O device.

The

received line signal detector line

is

active when the

'+SIO data term rdy' line

is

active and

is

provided for

I/O devices

that

require this signal.

Ignore

Mode

In

ignore mode, the sequence and function

of

the lines

are the same as they are

in

modem mode. (See Modem

Mode.) However, when the I/O device

is

going

to

send data

to

the

5100, the

5100

turns on the '+SIO request

to

send'

(clear

to

send line

at

the I/O device)

without

checking the

request

to

send line from the I/O device ('+SIO clear

to

send'

at

the expansion feature card).

When the serial I/O device

is

going

to

receive data from the

5100,

the

line '+SIO request

to

send' (clear

to

send

at

the

I/O device) remains off.

Terminal

Mode

A flip cable (terminal cable)

is

used

in

terminal mode

to

connect

the serial I/O device

to

the

serial I/O connector.

In

this cable the following lines are interchanged:

Data terminal ready and data set ready

Request

to

send and clear

to

send

Transmitted data and received data

Therefore, the line names

at

the

serial I/O device conform

to

the line names at the expansion feature card.

Theory

Of

Operation 2-13

The

following diagram shows

the

lines

that

are used during

serial I/O operations and the way

they

are connected

to

the

5100

in

terminal mode. Refer

to

the

IBM

5100 Mainten-

ance Information Manual for

the

serial I/O connector and

Zl

cable socket pin numbers.

Base I/O

Card (F2)

Bus

Out

Expansion

Feature Card (B2)

'+510 data term

rdy'

Z1

Cable

Socket

\

Serial I/O

Connector

I

r----,--,

.-----.

Serial I/O Device

Data Terminal Ready

'+510 data set

rdy'

i---

.....

t""'1

Data

5et

Ready

Busln

'+510 request

to

send'

I---

.....

~i

Request

To

5end

14----11111j

'+510 clear

to

send' Clear

To

5end

Device Adr Bus '+510

xmit

data'

Transmitted Data

Control '+510 rcvd

data'

Received Data

'+510 rcvd line

sig

det'

+ext horiz dr 5ignal ground 5ignal Ground

Protective ground

1----4._-+-----+-._-:-------:--1

Protective Ground

The

function

of

each line and

the

sequence

in

which

they

are

turned

on

and sensed

in

terminal mode

is

as

follows:

•

After

the

serial I/O program

is

loaded and enabled, the

5100

turns

on

'+510 data term

rdy'

to

indicate

that

it

is

ready for serial I/O operations.

•

The

serial I/O device turns on data set ready, which

is

sensed

at

'+510 data set ready'

at

the

expansion feature

card.

Note:

The

sequence

in

which data terminal ready and data

set ready are activated

is

not

significant.

When

the

5100

is

going

to

transmit data

to

the

serial I/O

device:

1.

The

5100

turns

on

'+510 request

to

send'

to

indicate

that

it

is

ready

to

send data.

2-14

2.

3.

L

_____

...1

I

Internal

Cable

L

____

_

,

Serial I/O

Terminal Cable

The

serial I/O device turns

on

clear

to

send ('+510

clear

to

send'

at

the

expansion feature card)

to

indicate

that

the

device

is

ready

to

receive

data

from

the

5100.

The

5100 sends

the

data

on

the

'+510

xmit

data'

line

to

the serial I/O device.

When

the

5100

is

going

to

receive

data

from

the

serial I/O

device:

1.

2.

The

lines data terminal ready and

data

set ready are

activated

the

same

as

when

the

5100

is

transmitting

data

to

the

I/O device.

The

line request

to

send ('+510 request

to

send'

at

the

card) remains off. Thus,

the

line '+510 clear

to

send'

will also be off.

3.

The

data

is

received from

the

serial I/O device on the

'+510 rcvd

data'

line.

/

IBM 5100 Setup guide

Popular Desktop manuals by other brands