square wave.
An
alternating
or
pulsating current
or
voltage whose
wave shape is square.
square
wave
generator. A signal generator delivering
an
output
signal having a square waveform.
SS. Start-stop.
start bit.
(1)
A signal to a receiving mechanism to get ready to
receive
data
or
perform a function. (2) In a start-stop system, a
signal preceding a character
or
block
that
prepares the receiving
device for the reception
of
the code elements.
start-of-text
(STX). A transmission control character
that
precedes a text
and
may be used to terminate the message
heading.
start-stop system. A data transmission system in which each
character
is
preceded by a start bit and
is
followed by a stop bit.
start-stop (SS) transmission. (1) Asynchronous transmission such
~
that
a group
of
signals representing a character
is
preceded by a
start bit and followed by a stop bit. (2) Asynchronous
transmission in which a group
of
bits
is
preceded by a start bit
that
prepares the receiving mechanism for the reception and
registration
of
a character and
is
followed
by
at
least one stop bit
that
enables the receiving mechanism to come to
an
idle condition
pending
the
reception
of
the next character.
static memory.
RAM
using flip-flops as the memory elements.
Data
is
retained as long as power
is
applied
to
the flip-flops.
Contrast with dynamic memory.
stop bit.
(1)
A signal to a receiving mechanism to wait for the
next signal. (2) In a start-stop system, a signal following a
character
or
block that prepares the receiving device for the
reception
of
a subsequent character or block.
~
storage.
(1)
A storage device. (2) A device,
or
part
of
a device,
that
can retain data. (3) The retention
of
data in a storage device.
(4) The placement
of
data
into a storage device.
Glossary-32
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