Glossary of Terms
MVI56E-MNETC ♦ ControlLogix Platform
Setup Guide
Modbus TCP/IP Multi Client Enhanced Communication Module
Page 68 of 72
ProSoft Technology, Inc.
April 18, 2011
H
Half-Duplex
A communications circuit or system designed to transmit and receive data, but
not both simultaneously. Citizens' Band (CB) or walkie-talkie radios are an
example of a half-duplex communication system. Either party to a radio
conversation may talk or listen; but both cannot talk at the same time without
corrupting each other's signal. If one operator is "talking", the other must be
"listening" to have successful communication.
I
IP Address
A 32-bit identification number for each node on an Internet Protocol network.
These addresses are represented as four sets of 8-bit numbers (numbers from 0
to 255), separated by periods ("dots").
Networks using the TCP/IP Protocol route messages based on the IP address of
the destination. Each number can be 0 to 255. For example, 192.168.0.100 could
be an IP address. Each node on the network must have a unique IP address.
L
LED
Light-emitting diode.
M
MAC ID
A hexadecimal number that uniquely identifies an Ethernet device. This MAC ID
number is encoded onto the hardware by the manufacturer at the time the device
is made and may not be changed.
Master
A Master is a program or device that initiates all requests for information from
other programs or the devices on a network, known as a Slaves, in a Master-
Slave communication model.
A Client on an Ethernet network is equivalent to a Master on a Serial network.
N
Network
A series of stations or nodes connected by some type of communication medium.
A network may consist of a single link or multiple links.
Node
An address or software location on the network.
