Using
Your
ASCII
Terminal
Terminal-Controlled
Keys
The terminal
acts
Independently of the controller for
the
following functions (the
function
of
these
keys
Is
not
altered):
• Typematic operation for
some
or all keys on
the
keyboard. When a typematic
key Is
pressed,
Its function Is
repeated
while
the
key
remains
pressed.
See
your
terminal
manual
for
more
Information
about
this
function.
•
Setup
keys.
•
Local
print.
•
Cursor
mode
keys
(block
or
underline).
3270
Functions
ATTN:
The
ATTN
function signals an attention condition to the host
(SNA
only).
Using
ATTN
during a print IDENT
operation
causes
the
ID
operation
to
end.
The
keyboard locks,
and
the previous printer
ID
and
the
function not
supported
messages
(X
-f)
are
displayed on
the
status
line. You
can
unlock
the
keyboard by
using
the
Reset
key
sequence
defined for your terminal
and
repositioning
the
cursor.
Program
Attention Functions (Enter, Clear, PF Keys,
and
PA Keys):
These
functions
cause
the
transfer
of
information
to
the
host.
An
attention
Identification
(AID)
character
Is
sent
to
the
host, which identifies
the
function
causing
the
transfer.
(Note
that
the
AID
characters
are
not
typematic.)
The
Clear
function
clears
all
positions
on
the
screen
and
positions
the
cursor
In
the
upper
left
corner.
Change
Screen:
Depending
on how
the
3174 Is
customized,
the
Change
Screen
function
allows
you
to
access
multiple
host
sessions.
See
Chapter
1, "Getting
Started"
for
more
details.
Cursor
Movement
Functions
(Cursor
Up,
Cursor
Down,
Cursor
Right,
Cursor
Left,
Cursor
Fast
Right,
and
Cursor
Fast
Left):
Cursor
Up, Down, Right,
and
Left
move
the
cursor
one
position
at
a
time
Into
any
character
position.
Cursor
Fast
Right
and
Fast
Left
move
the
cursor
two
positions
at
a
time.
Using
these
functions,
you
can
move
the
cursor
Into
any
position,
including
unprotected
and
protected
fields.
All of
the
following
functions
can
cause
the
cursor
to
wrap:
• If
the
cursor
Is
located
In
the
last
position
of a
line
and
you
use
the
Cursor
Right
function,
the
cursor
moves
to
the
first
position
of
the
next
line.
• If
the
cursor
Is
located
In
the
first
position
of a
line
and
you
use
the
Cursor
Left
function,
the
cursor
moves
to
the
last
position
of
the
previous
line.
• If
the
cursor
Is
located
In
the
first
line
of
the
screen
and
you
use
the
Cursor
Up
function,
the
cursor
moves
to
the
last
line
of
the
screen,
without
changing
the
column
position.
• If
the
cursor
Is
located
In
the
last
line
of
the
screen
and
you
use
the
Cursor
Down
function,
the
cursor
moves
to
the
first
line
of
the
screen,
without
changing
the
column
position.
Chapter 3. Using Your
ASCII
Terminal
3-9
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