Tektronix 4023 Instruction Manual page 71

APPENDIX
E
4023
Users
GLOSSARY
(cont.)
Line voltage—
The
force of the supply
at
an
electrical outlet.
In
the United
States,
it is
usually
115V
or
230V
or
some
slight variation of those
values.
Monitor— As
associated
with the Terminal,
monitor
refers
to
a
device
which provides
a
copy
of the
Terminal
display,
or
otherwise
displays
data
which
is
processed
by
the
Terminal.
Lines, signal— See
signal lines.
Local
Echo—
Simulating echoing within the Terminal,
so
that
the Terminal executes the data
it
transmits,
without
having
it
echoed
by
the
receiving device.
Local operation—
An
operating status
which
isolates
the
Terminal from the computer and
sets
up an echoplexing
condition.
LSB
(least significant
bit)—
The
bit
in
the position of
least
magnitude
in
a binary expression; usually written as
the
last
bit
on
the
right.
MSB
(most
significant
bit)—
The
bit in
the position of
greatest
magnitude
in
a
binary expression; usually written
as the
bit
on
the
left.
Nul Suppression— The
feature of the
Terminal
that sup-
presses
transmission
of
NUL
characters.
Non-Alpha—
Fields into
which only those characters con-
tained
in
columns 2 and
3 of the
ASCII Code Chart can be
entered
from
the keyboard.
Non-Transmittable
Data—
Data that
is
identified
by
a
Field
Attribute
Code
as
being non-transmittable.
Magnetic
Storage
Medium— An
auxiliary device used
with
the Terminal on which system
related
information can be
stored for future data processing applications.
Memory—
See
Buffer.
On
Line
operation— Communicating with the computer.
Optional accessory—
A
device which can be purchased
from
Tektronix
for use
with the Terminal, but
is
not supplied
as
part of the standard
Terminal package.
Message Separator—
A
control
code (ETX)
that
is
stored
in
Terminal
memory
at
the cursor location. Message Separa-
tors can be either
keyboard
or
computer
initiated,
and
are
used to
limit
the data transmitted to the
computer
to the
data bracketed
by two
Message Separators.
The
Home
and
last
character position
of
the
last
line
perform Message
Separator functions.
Options—
See Strappable Options.
PAGE— A
command
which
erases
a
display, sets
initial
condition
Mode, and
homes
the cursor.
Also
a
completed
display.
Motherboard—
A
wiring
arrangement which makes
all
signal
lines
in
the Terminal's pedestal
available to
all
installed
circuit cards.
Page
full
break—
A
signal
generated
when
a
page
full
of
information has caused the display to
line
feed past the
last
(24th)
line.
Also an option contained
on
the
Data
Communication
Interface circuit card.
Mode—
A
Terminal operating
configuration.
Page
full
busy—
A
busy
signal
which
can be generated
in
response
to a
page
full
of information.
Modem
(Modulator/demodulator)—
A
device
which
can
convert
digital
data
to a signal
(in
a
process
called
modulation) which can be conveyed over telephone
lines,
and
can
perform
the reverse function
in
a process called
demodulation.
A modem
is
required
on
each
end of the
telephone
line.
Parallel
transmission— simultaneous transmission of
more
than
one
data
bit.
Pedestal—
An
optional accessory
on which
the
4023 may
be
mounted.
E-4