Specifications
ODD
or
EVEN
parity
is selected, a
parity
bit
is
transmitted.
The
parity
bit
can be a 1
or
0
and
is
added
to
the
1 's in
the
data,
so
that
the
sum
is
always
odd
for
ODD
parity,
or
even
for
EVEN
parity.
When
NONE
is
selected,
no
parity
bit
is
transmitted.
•
STOP
BITS:
initially
set
to
1.
Can be
1,1-1/2
or
2.
The
stop
bits
are
transmitted
after
the
data
bits.
•
HARDWARE
HANDSHAKING:
Initially
OFF..
Can be set
ON
for
use
with
intelligent
printers
connected
to
Channel
C.
Allows
the
Industrial
Terminal
System
to
recognize
when
to
start
and
stop
sending
data.
•
CURSOR
ATTRIBUTE:
When ON,
cursor
is
displayed.
When
OFF,
cursor
is
not
dis-
played.
•
HALF
DUPLEX:
initially
ON. When OFF,
full
duplex
is selected.
•
AUTO
LINE
FEED:
when
ON,
the
ENTER
key
generates
a
line
feed
and
carriage
return. When OFF,
the
ENTER key generates
a
carriage
return
without
a
line
feed.
•
GRAPHICS
MODE:
turns
graphics
capa-
bility
ON
or
OFF.
•
CONTROL
CODE
DISPLAY:
when
ON,
the
two-letter
symbol
for
some
control
codes
(those
used
by
the
Industrial
Terminal
System)
will
be
displayed.
The
control
code
will
not
be
executed.
•
SCROLLING:
When
ON
and
the
cursor
is
on
the
last
line
of
the
screen, each
new
line
of
data
added
moves
all
other
lines
up
one
line.
When
OFF
and
the
cursor
is
on
the
last
line,
the
screen
does
not
clear
as
new
lines
are
entered
at
the
top
of
the
screen.
•
WRAP
AROUND:
ON
-
When
the
cursor
reaches
the
end
of
a line,
it
moves
to
the
beginning
of
the
next
line.
OFF-
When
the
cursor
reaches
the
end
of
a line,
it
stays
there
and, as
new
data
is
entered,
each
new
character
writes
over
the
previous character.
•
ERASE
LINE
AFTER
CR:
initially
OFF.
When
ON,
the
data
from
the
cursor
position
to
the
end
of
the
line
will
be
deleted
when
a
carriage
return
is entered.
Page
6-3
1770-805
PORT
C: can be set
ON
or
OFF
for
use
with
a
peripheral
device.
6.2
ALPHANUMERIC
CAPABILITIES
In
Alphanumeric
mode, all
Industrial
Terminal
Systems
can
display
most
ASCII
characters,
excluding
the
lower
case
alphabet
and
a
few
symbols
(Table
6-1).
All
lower
case
alpha
characters
received
will
be
displayed
as
their
upper
case equivalents.
6.2.1
Alphanumeric
Keyboard
Definitions
There
are several keys
on
the
Industrial
Ter-
minal
keyboards
that
have
special
functions.
Some
of
these keys
for
the
1770-
T4
system
will
be
different
from
the
ones
used
with
the
1770-T1, -T2,
andT3
systems.
These
keys are
defined
as
follows:
1770-T1, -T2,
AND
-T3
SYSTEMS
[LINE
FEED]-
Moves
the
cursor
down
one
line
in
the
same
column.
[RETURN]
-
Returns
the
cursor
to
the
beginning
of
the
same line.
[RUB
OUT]
-
Backspaces
one
character
and deletes
the
character
last entered.
[REPT
LOCK]-
Allows
the
next
key
pressed
to
be repeated
continuously
until
[REPT
LOCK]
is pressed again.
[SHIFT]-
Allows
the
next
key
pressed
to
be
a
shift
character.
[SHIFT
LOCK]-
Allows
all
subsequent
keys
pressed
to
be
shift
characters
until
[SHIFT]
or
[SHIFT
LOCK]
is pressed.
[CTRL]-
Used as
part
of
a
key
sequence
to
generate
a
control
code.
[ESC]-
Generates
an
ASCII
ESCAPE
code.
[MODE
SELECT]-
Terminates
all
functions
and
returns
the
Mode
Select
menu
to
the
screen.
Blank
Yellow
Keys-
Space
keys.
Generate
an
ASCII
space
character.
1770-T4 SYSTEMS
[ENTER]-
Returns
the
cursor
to
the
begin-
ning
of
the
same line.
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