ILX34-AENWG
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POINT I/O Platform
Glossary of Terms
Wireless Point I/O Adapter
Setup Guide
Page 66 of 79
ProSoft Technology, Inc.
July 31, 2009
Ethernet network
A local area network designed for the high-speed exchange of information
between computers and related devices.
EtherNet/IP
Ethernet industrial protocol applies a common application layer (CIP) over
Ethernet by encapsulating messages in TCP/UDP/IP.
Explicit messaging
Non-time critical messaging used for device configuration and data collection,
such as downloading programs or peer-to-peer messaging between two PLC
units.
F
Firmware
Firmware is the embedded software code that that runs in the module to direct
module function (similar to the BIOS in a personal computer). This is
distinguished from the Setup/Diagnostic Application software that is installed on
the Configuration PC.
Frequency Hopping
A radio that rapidly changes its operating frequency several times per second
following a pre-determined sequence of frequencies. The transmitting and
receiving radios are programmed to follow the same frequency hopping
sequence.
Frequency Hopping Spread Spectrum
Changes or hops frequencies in pattern known to both sender and receiver.
FHSS is little influenced by radio stations, reflections, or other environmental
factors. However, it is much slower than DSSS.
Fresnel Zone
An elliptical area on either side of the straight line of sight that must also be clear
for a long-range wireless network to work.
Full-Duplex
A communications circuit or system designed to simultaneously transmit and
receive two different streams of data. Telephones are an example of a full-duplex
communication system. Both parties on a telephone conversation can talk and
listen at the same time. If both talk at the same time, their two signals are not
corrupted.
