Operating instructions

Abbreviations
C.1 Abbreviations
SIMATIC Rack PC IL 43
C-6 Operating Instructions, Edition 09/2005, A5E00432875-01
Abbreviation Term Definition
RxD Receive Data Data transfer signal
SATA Serial ATA An interface for hard disk drives and optical
drives with serial data transfer of up to 1.5 Mbps
SCSI Small Computer System Interface Interface for connecting SCSI devices (e.g. hard
disk or CD–ROM drives)
SDRAM Synchronous DRAM A design form of dynamic semiconductor chip
(DRAM) that can be operated at a higher clock-
pulse rate as conventional DRAM circuits.
This is enabled by means of block access, where
the DRAM specifies the relevant next memory
address.
SELV Safety Extra Low Voltage Safety extra-low voltage
SMART Self Monitoring Analysis and Reporting
Technology
Hard disk error diagnostics program
SMS Short Message Service Short message via telecommunication network
SNMP Simple Network Management Protocol Network protocol
SO-DIMM Small Outline Dual Inline Memory Module
SOM SafeCard on Motherboard (SOM) SafeCard On Motherboard consists of monitoring
blocks on the motherboard, a driver and the SOM
program. It provides functions for monitoring
various temperatures and program execution
(Watchdog).
SPP Standard Parallel Port Synonym for parallel port
SVGA Super Video Graphics Array Enhanced VGA standard with at least 256 colors
SVP Serial number of the device
SW Software
TCO Total Cost of Ownership
TFT Thin-Film-Transistor Type of LCD flat-screen
TTY Tele Type Asynchronous data transfer
TxD Transmit Data Data transfer signal
TWD Watchdog Time Watchdog monitoring time
UL Underwriters Laboratories Inc.
UMA Unified Memory Architecture
URL Uniform Resource Locator Designation of the full address of an Internet
page
USB Universal Serial Bus A serial bus with a data transfer rate of max. 12
megabits per second (Mbps) for USB 1.1 or 480
Mbps for USB 2.0 for connecting peripherals to a
computer. USB can connect up to 127
peripherals, such as external CD-ROM drives,
printers, modems, mice, and keyboards, to the
system through a single, general-purpose port.
UXGA Ultra Extended Graphics Array Graphic standard, maximum resolution 1600 x
1200 pixels
V.24 ITU-T standardized recommendation for data
transfer via serial ports
VDE Verein deutscher Elektrotechniker