SPACE
BAR
[JITJ
EJEJ
VISUAL
TECHNOLOGY
INCORPORATED, 540
MAIN
STREET, TEWKSBURY,
MA
01876
Depressing the
BREAK
key
causes
a 250 millisecond spacing condition on the
data-line. Depressing SHI FT-BREAK
causes
a 3.5 second spacing condition
of
the
data-line
and
causes
the Data Terminal Ready
lead
to
go
low
for
3.5 seconds.
Depressing CTRL-BREAK
causes
transmission
of
the Answerback
Message.
Depressing the DELETE key
causes
the
DEL
code (octal 177)
to
be
transmitted.
Depressing the SPACE BAR
causes
the
SP
code (octal 040)
to
be
transmitted,
and
causes
the
character at the cursor location
to
be
erased
and
the cursor advanced
one position.
Depressing a cursor positioning key
will
cause
the cursor
to
move one position in
the direction indicated on the key. The codes transmitted
by
these keys
will
vary
depending on whether ANSI
or
VT-52
mode
is
selected. Table
4-1
summarizes
the
codes
transmitted
for
each
key in both ANSI
and
VT-52
modes.
TABLE
4-1
CODES
TRANSMITTED
BY
CURSOR POSITIONING KEYS
Codes
Transmitted
ANSI Mode
and
Cursor
Key
Depressed
VT~52
Mode ANSI Mode
Key Mode Set*
OJ
ESCA
ESC
[A
ESCO A
OJ
ESC
B
ESC
[ B
ESCO B
EJ
ESCC
ESC
[ C
ESCOC
EJ
ESC
D
ESC
[ D
ESCO D
*See Section 5.3.2.12
for
Cursor
Key
Mode
definition
EJEJ
EJEJ
The
four
function keys labeled
PF
1 through PF4
send
multi-code
sequences
that
are
usually interpreted by
an
application program. By using these keys, the
number
of
keystrokes
necessary
by
an
operator
to
access
commonly
used
func-
tions
is
reduced
to
one.
The code
sequences
generated
by
these keys
will
vary depending on whether
VT-52
or
ANSI Mode
is
selected per Table 4-2.
23
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