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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 ALL TABS:
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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