List of abbreviations
B.1 Abbreviations
SIMATIC HMI IPC677C
Operating Instructions, 04/2013, A5E02722710-04
269
Abbreviation Term Meaning
RS 485 Reconciliation Sublayer 485 Bi-directional bus system designed for up to 32
nodes.
RTC Real Time Clock Real-time clock
RTS Reliable Transfer Service Request to send
RxD Receive Data Data transfer signal
SAS Serial attached SCSI
SATA Serial Advanced Technology Attachment
SCSI Small Computer System Interface
SDRAM Synchronous DRAM
SELV Safety Extra Low Voltage Safety extra low voltage
SLC Second Level Cache
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
SOL Serial over LAN Text-based remote control
SOM SafeCard on Motherboard (SOM)
SPP Standard Parallel Port Synonym for parallel port
SRAM Static Random Access Memory Static RAM
SSD Solid State Drive
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
TXT Trusted Execution Technology Hardware implementation
TWD Watchdog Time Watchdog monitoring time
UEFI Unified Extensible Firmware Interface
UL Underwriters Laboratories Inc. US organization for tests and certifications
according to own or binational standards (with
CSA / Canada) standards.
UMA Unified Memory Architecture Video memory
URL Uniform Resource Locator Designation of the full address of an Internet
page
USB Universal Serial Bus
UXGA Ultra Extended Graphics Array Graphic standard, maximum resolution
1600x1200 pixels.
V.24 ITU-T standardized recommendation for data
transfer via serial ports.
VCC Positive supply voltage of integrated circuits
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