Siemens SENTRON PAC4200 Manual page 248

Glossary
Firmware
Device operating software. The firmware is stored in the device's electronic components.
Load profile memory
Device data memory for storing performance data, including associated identifying
characteristics such as a time stamp.
MDI-X auto crossover
Ability of the interface to detect the send and receive lines of the connected device
autonomously and adjust to them. This prevents malfunctions resulting from mismatching
send and receive wires. Both crossed and uncrossed cables can be used.
PROFIBUS
PROCESS FIELDBUS, a European process and fieldbus standard defined in the PROFIBUS
standard EN 50170, Volume 2 PROFIBUS. Specifies the functional, electrical and
mechanical characteristics of a serial bit stream fieldbus system.
PROFIBUS is a bus system that connects PROFIBUS-compatible automation systems and
field devices together at the cell level and field level.
RJ45
Symmetrical connector for data lines that is also known as a Western connector or a
Western plug. This is a widely used plug connector in telephone and ISDN technology which
is used in LAN installations in the office environment.
RMS
Root-mean-square value of a signal that changes as a function of time.
TCP/IP
Transport Control Protocol / Internet Protocol, the de-facto standard; protocol for worldwide
communication over Ethernet.
Twisted pair
Data cable with twisted-wire pairs; the twist in the wire pairs provides good transmission
properties and prevents electromagnetic interference. Twisted-pair cables are available in
different qualities for different transmission rates.
UTC
Universal Time Coordinated. International reference time to which the worldwide time zone
system refers. Has replaced Greenwich Mean Time (GMT).
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SENTRON PAC4200
Manual, 09/2008, A5E02316180B-01