Siemens SIMATIC HMI KTP400 Basic Operating Instructions Manual page 122

Abbreviations
RJ45
RTS
RxD
SD Card
SELV
SP
PLC
STN
Sub-D
TAB
TCP/IP
TFT
TTY
TxD
UL
USB
UPS
WINS
122
Registered Jack Type 45
Request to send
Receive Data
Security Digital Card
Safety Extra Low Voltage
Service Pack
Programmable Logic Controller
Super Twisted Nematic
Subminiature D (plug)
Tabulator
Transmission Control Protocol/Internet Protocol
Thin Film Transistor
Teletype
Transmit Data
Underwriter's Laboratory
Universal Serial Bus
Uninterruptible power supply
Windows Internet Naming Service
Basic Panels 2nd Generation
Operating Instructions, 10/2016, A5E33293231-AB