Specifications
Page
6-1
1770-805
Section 6
ALPHANUMERIC
MODE
6.0
GENERAL
When
Alphanumeric
mode
is selected,
the
Industrial
Terminal
System
will
act
as
a data
terminal.
In
this
mode,
it
can
communicate
with
a
modem,
computer,
or
other
RS-232-C
device
connected
to
Channel
B. When
enter-
ing
data
from
the
Industrial
Terminal
key-
board,
the
keys are pressed
one
at a
time,
not
two
at
one
time
like
some
data terminals.
The
1770-T1, -T2, and
-T31ndustrial
Terminal
Systems
have
the
same
operating
commands
and
use
the
same
keytop
overlay
for
alpha-
numeric
mode.
The
1770-T4
Industrial
Termi-
nal
System
uses
some
different
operating
commands
and
a
different
keytop
overlay
for
alphanumeric
mode.
If
graphic
characters
are
desired, an
Alphanumeric/
Graphics
Keytop
Overlay
(Cat. No.
1770-KAB)
or
a
PLC-3
Graphics
Keytop
Overlay
( Cat. No. 1770-
KDB)
can be used.
The
keytop
overlays used
for
Alphanumeric
mode
are
shown
in
Figure
6-1.
In
alphanumeric
mode,
the
Industrial
Terminal
System
can
send
and
display
many
ASCII
characters.
The
capabilities
of
the
Industrial
Terminal
System
are
described
in
the
follow-
ing
sections.
6.1
ALPHANUMERIC
OPTIONS
MENUS
After
selecting
Alphanumeric
mode, an
Alpha-
numeric
options
menu
is
displayed
on
the
screen.
It
lists
various
operating
parameters
that
can
be
selected
before
entering
Alpha-
numeric
mode.
The
menu
for
the
1770-
T4
Industrial
Terminal
System
differs
from
that
of
the
1770-T1, -T2, and
-T3
Industrial
Terminal
Systems.
6.1.1
Alphanumeric Options {1770-T1, -T2,
and -T3 Systems)
The
seven
options
in
the
menu in
Figure
6-2
are
described
as
follows:
•
BAUD
RATE:
the
number
of
bits
transmitted
per
second.
The
number
initially
displayed
reflects
the
switch
group
assembly
setting.
When
the
110
baud
rate is selected,
two
stop
bits
are used.
With
all
other
baud rates,
one
stop
bit
is used.
• PARITY: used
for
checking
the
validity
of
data.
Selections
are
ODD,
EVEN,
and
NONE.
The
parity
initially
displayed
reflects
the
switch
group
assembly
settings.
When
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.
•
DUPLEX:
communication
mode
can
be
HALF
or
FULL.
•
CHANNEL
C:
initially
OFF. Can be set
ON
for
use
with
peripheral
devices.
•
CURSOR:
initially
ON. Can be set OFF so
cursor
will
not
be
displayed
on
the
screen.
•
AUTO
LINE
FEED
ON
RETURN:
initially
OFF.
When
set
ON,
the
RETURN
key
generates
a
carriage
return
and
line
feed.
When set
OFF,
the
RETURN
key
generates
a
carriage
return
without
a
line
feed.
•
CONTROL
CODE
DISPLAY:
initially
OFF.
When set ON, a
control
code
entered
from
the
keyboard
will
display
a
corresponding
two-letter
abbreviation.
The
control
code
will
not
be executed.
6.1.2Aiphanumeric Options (1770-T4 System)
Thirteen
options
and
operating
parameters
can
be
selected
for
Alphanumeric
mode
(Figure
6-3). These
parameters
are
defined
as
follows:
•
BAUD
RATE:
the
rate
of
data
transmission
in
bits
per
second.
Initial
value
reflects
the
current
switch
group
setting.
Selections
are
9600,4800,2400,1200,600,300,
and
110.
• PARITY:
used
for
checking
the
validity
of
data.
Selections
are
ODD,
EVEN,
and
NONE.
The
parity
initially
displayed
reflects
the
switch
group
assembly
settings.
When
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