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IBM 3270 User Guide

IBM 3270
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controller.
A
unit
that
controls
input/output
operations
for
one
or
more
devices.
control
unit.
A
general
term
for
any
device
that
provides
common
functions
for
other
devices
or
mechanisms.
Synonym
for
controller.
control
unit
terminal
(CUT).
A
terminal
that
relies
on
the
3174
to
Interpret
the
data
stream.
Examples
are
the
3178,
3179,
3278
Model
2.
and
3279
Model
S2A.
control
unit
terminal
(CUT)
mode.
A
host-Interactive
mode
that
enables
an
IBM
3270
Personal
Computer
customized
in
this
mode
to
run
only
one
session
emulating
a
3178,
3179,
3278
Model
2,
or
3279
Model
S2A.
conversion.
(1)
In
programming
languages,
the
transformation
between
values
that
represent
the
same
data
Item
but
belong
to
different
data
types.
Information
may
be
lost
as
a
result
of
conversion
because
accuracy
of
data
representation
varies
among
different
data
types.
(2)
The
process
of
changing
from
one
method
of
data
processing
to
another
or
from
one
data
processing
system
to
another.
(3)
The
process
of
changing
from
one
form
of
representation
to
another,
for
example,
to
change
from
decimal
representation
to
binary
representation.
create.
In
3174
central
site
customizing,
to
create
a
library
member
for
a
network
controller,
and
store
the
customizing
data
for
that
library
member
on
a
Library
diskette.
cursor.
(1)
A
movable,
visible
mark
used
to
Indicate
the
position
at
which
the
next
operation
will
occur
on
a
display
surface.
(2)
A
unique
symbol
that
Identifies
a
character
position
In
a
screen
display,
usually
the
character
position
at
which
the
next
character
to
be
entered
from
the
keyboard
will
be
displayed.
data
stream.
(1)
All
data
transmitted
through
a
data
channel
in
a
single
read
or
write
operation.
(2)
A
continuous
stream
of
data
elements
being
transmitted,
or
Intended
for
transmission.
In
character
or
binary-digit
form,
using
a
defined
format.
See
also
data
stream
format.
data
stream
format,
in
SNA,
the
format
of
the
data
elements
(end-user
data)
In
the
request
unit
(RU).
See
also
3270
data
stream
and
SNA
character
string
(SCS).
decrypt.
To
convert
encrypted
data
Into
clear
data.
Contrast
with
encrypt.
device.
A
mechanical,
electrical,
or
electronic
contrivance
with
a
specific
purpose.
disk.
A
direct-access
data
storage
medium,
which
may
be
either
flexible
(diskette)
or
hard
(fixed
disk).
diskette.
A
flexible
magnetic
disk
enclosed
In
a
protective
container.
diskette
drive.
The
mechanism
used
to
seek,
read,
and
write
data
on
diskettes.
Disk
Operating
System
(DOS).
A
program
that
controls
the
operation
of
an
IBM
Personal
Computer
and
the
execution
of
application
programs.
display
field.
(1)
An
area
in
the
display
buffer
that
contains
a
set
of
characters
that
can
be
manipulated
or
operated
upon
as
a
unit.
(2)
A
group
of
consecutive
characters
(In
the
buffer)
that
starts
with
an
attribute
character
(defining
the
characteristics
of
the
field)
and
contains
one
or
more
alphanumeric
characters.
The
field
continues
to,
but
does
not
Include,
the
next
attribute
character.
display
frame.
(1)
In
computer
graphics,
an
area
In
storage
In
which
a
display
Image
can
be
recorded.
(2)
In
computer
micrographics,
an
area
on
a
microform
in
which
a
display
Image
can
be
recorded.
display
station.
An
Input/output
device
containing
a
display
screen
and
an
attached
keyboard
that
allows
a
user
to
send
Information
to
or
receive
Information
from
the
system.
EiA
communication
adapter.
A
communication
adapter
conforming
to
EIA
standards
that
can
combine
and
send
Information
on
two
lines
at
speeds
up
to
19.2
kbps.
emulate.
(1)
To
Imitate
one
system
with
another,
primarily
by
hardware,
so
that
the
Imitating
system
accepts
the
same
data,
executes
the
same
computer
programs,
and
achieves
the
same
results
as
the
Imitated
computer
system.
emulation.
(1)
The
Imitation
of
all
or
part
of
one
system
by
another,
primarily
by
hardware,
so
that
the
Imitating
system
accepts
the
same
data,
executes
the
same
programs,
and
achieves
the
same
results
as
the
Imitated
computer
system.
(2)
The
use
of
programming
techniques
and
special
machine
features
to
permit
a
computing
system
to
execute
programs
written
for
another
system.
(3)
Imitation;
for
example,
imitation
of
a
computer
or
device.
(4)
See
terminal
emulation.
(5)
Contrast
with
simulation.
encrypt.
To
scramble
data
or
convert
It,
before
transmission,
to
a
secret
code
that
masks
the
meaning
of
the
data
to
any
unauthorized
recipient.
Contrast
with
decrypt.
X-4
Entry
Assist
User's
Guide

Table of Contents

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IBM 3270 Specifications

General IconGeneral
BrandIBM
Model3270
CategoryDesktop
LanguageEnglish

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