129
RS-232 (Recommended Standard 232) is a standard for
serial binary single-ended data and control signals
connecting between a Data Terminal Equipment (DTE) and
a Data Circuit-terminating Equipment (DCE). It is
commonly used in computer serial ports. The controlling
standard is Electronic Industries Association (EIA) RS-
232C (1969). Current revision is Telecommunications
Industry Association TIA-232-F (1997). In the personal
computer industry RS-232 has been largely replaced by
the USB interface standard. Industrial equipment and
programmable logic controllers (PLCs) still use the RS-
232-C standard port.
RTC
Acronym for Real Time Clock
S
Sag
A decrease between 0.1 and 0.9 per unit in RMS voltage or
current at the power frequency, for durations from a half-
cycle to one minute.
SATA
Serial Advance Technology Attachment (SATA) is a
computer bus interface that connects host bus adapters to
mass storage devices such as hard disk drives and optical
drives. Serial ATA (SATA) replaces the older Parallel ATA
(PATA), offering several advantages over the older
interface: reduced cable size and cost (seven conductors
instead of 40), faster data transfer through higher signaling
rates, and more efficient transfer.
SATA host adapters and devices communicate via a high-
speed serial cable over two pairs of conductors. In
contrast, PATA used a 16-bit wide data bus with many
additional support and control signals, all operating at
much lower frequency.
Screen
A visual display on a computer monitor is called a screen.
USIMaster
©
is viewed on a family of screens, such as:
System Configuration screen, Graphic Signal Processing
(GSP) screen, USI Master Station screen, etc.
SER
Acronym for Sequence of Events Recorder, a type of
Disturbance Monitoring Equipment used in the USI
Disturbance Monitoring System.
Shunt
A resistive device that provides an output voltage
proportional to circuit current.
Single Ended
Or 1-ended (q.v.). A type of distance-to-fault calculation.
SMTP/POP3
Abbreviation for Simple Mail Transfer Protocol/Post Office
Protocol Version 3. SMTP is an Internet standard for E-mail
transmission across Internet Protocol (IP) networks (see
TCP/IP). User-level applications typically use SMTP for
transmission of E-mail messages and POP3 (q.v.) for
reception of E-mail messages.
SSD
Acronym for Solid State Drive, an electronic data storage
unit with no moving parts.
Start/Stop Time
Time Query method for LDC system. See Start
Time/Duration method.
To Next Page
Loading...