Display Control
From
a
program
executing
in
a
host
computer, you
set
and
clear
tab
stops
using
the
following
escape sequences:
SET
TAB:
Ec
CLEAR
TAB:
Ec 2
CLEAR ALLTABS: Ec 3
The
first
two escape sequences
set
and
clear
(respectively) a
tab
stop
at
the
current
cursor
position. Therefore, before
using
them,
you will
first
have
to position
the
cursor
at
the
desired
column
using
one of
the
cursor
control escape sequences described
earlier
in
this
section.
TAB
From
the
keyboard, you
can
move
the
cursor
ahead
to
the
next
subsequent
tab
stop
using
the
_ key.
In
Format
mode,
pressing
the
_ key once only moves
the
cursor
to
the
beginning
of
the
next
unprotected field only
(transmit
only fields
are
ignored). Tabbing from
the
last
field moves
the
cursor to
the
beginning
of
the
first
field. Tab
acts
similarly
in
the
User
Key
menu
and
the
configuration menu.
If
Memory Lock is on,
Format
mode is active,
the
cursor is
within
the
locked
area,
and
the
next
(and only other) unprotected field
has
been rolled
behind
the
locked rows, a
tab
will
first
roll
the
hidden
field into view.
The
next
tab
will move
the
cursor to
the
first
column of
the
newly revealed field.
From
a
program
executing
in
a host computer, you
can
move
the
cursor
ahead
to
the
next
tab
stop
issuing
either
an
ASCII
<HT>
control code (decimal 9; Control ttl") or
the
following
escape sequence:
Ec I
Tab commands received from
the
host
when
the
terminal
is
in
Format
mode positions
the
cursor to
the
next
unprotected
or
transmit-only
field, whichever is encountered first.
Tab stops
that
do
not
lie
within
the
area
bounded by
the
left
and
right
margins
are
ignored by
the
tab
function.
Note
that
the
left margin is
treated
as
a
tab
stop. When
the
cursor is positioned
at
or
to
the
right
of
the
rightmost
tab
stop,
the
tab
function moves
the
cursor
to
the
left margin in
the
next
lower line. When
the
cursor is positioned
to
the
left of
the
left margin, however,
the tab
function advances
the
cursor
to
the
first explicit
tab
stop (not
the
left margin) in
the
line (or to
the
left margin in
the
next
lower line if
no
explicit
tab
stops
are
defined).
4-21
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