VISUAL
TECHNOLOGY
INCORPORATED,
RAILROAD
AVENUE,
DUNDEE
PARK,
ANDOVER,
MA
01810
If
the host
sends
the
VISUAL
200
an
XOFF
(DC3) in
full
duplex, the
VISUAL
200
will
suspend transmission.
Up
to
two
characters may
be
transmitted
after
receipt
of
the
XOFF
before transmission halts. When the host
sends
an
XON (DC1), transmission
will
resume at
the
point
where
it
halted. Transmission
is
also halted whenever the
CONVERT
FUNCTION
and RST keys are depressed simultaneously.
4.12.5 Tab Stops
When operating in
Block mode and Unprotected mode, tab
functionality
will
be
as
de-
scribed in section 4.3.
In Protect mode, columnar tab stops
will
not
be
recognized. The
only
tab stops
will
be
the
beginning
of
unprotected fields.
4.12.6 Parity Errors
In Block mode, detected
parity
errors
are
displayed
as
P
E
as
in Character mode. The orig-
inally
received code
with
the
parity
error
is
not
retained in internal memory, rather a Rub-
out
(DE
L)
code
is
used.
If
the
area
of
the screen containing the
parity
error
is
subsequently
transmitted the
following
sequence
will
be
transmitted when the P
E
is
encountered:
Batch mode,
HZ1500+
.............................
.
Batch mode,
all
other
modes
........................
.
Page
and Line mode,
HZ1500+
......................
.
Page
and Line mode, all
other
modes
..................
.
4.12.7
Programmable
Function
Keys
4.12.7.1
General
~F
DEL
~G
ESC
F
DEL
ESC
G
~F
~G
ESC
F
ESC
G
When the
Block Mode
Option
is
installed, a
row
of
14 Programmable
Function
keys
(F0
through F 13)
is
provided
as
standard. When depressed,
each
key
will
generate a pre-defined
sequence, just
as
in character mode,
if
not
programmed otherwise. The pre-defined
sequence
for
each
key
is
illustrated in Figure 3-3.
Each key may
be
programmed
to
generate a user-defined sequence when depressed. This
sequence may
be
a
maximum
of
48
characters long. When this
boundry
is
reached while
programming, the bell
will
sound and the terminal
will
exit
the program mode.
A
function
key may
be
downline
loaded
from
the host
or
loaded
from
the keyboard via
Escape
Sequence and may contain displayable codes,
control
codes, and
Escape
Sequences.
Once a key
has
been
programmed,
it
will
remain programmed
until
the terminal
is
re-
initialized. Changing between Block/Character mode
will
not
alter the
information
pro-
grammed
into
the
function
keys.
Each key may be programmed
so
that
its
message
is
sent
to
the screen, the host
or
part
of
the
message
to
each
destination.
Function
keys may
be
strung together
by
loading a
"call"
for
one
function
key
into
another
function
key. When
linking
keys, the
maximum
number
of
characters which
can
be
trans-
mitted
by
depressing a single key
is
255.
If
keys are linked which exceed this
maximum,
transmission
will
be
terminated and the terminal
will
return
to
normal operation.
CAUTION:
No
check
is
made
for
an
indefinite
loop!
29
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