User manual

Glossary
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33002479 06 07/2008
OSI model Open System Interconnection model. A reference standard describing the required
performance of devices for data communication. Produced by the International
Standards Organization.
packet The unit of data sent across a network.
Peer Cop Software that allows you to configure data blocks to be transferred between
controllers on a Modbus Plus network.
PING Packet Internet Groper. A program used to test whether a destination on a network
can be reached.
PLC Programmable Logic Controller
port An access point for data entry or exit within a host using TCP services.
protocol Describes message formats and a set of rules used by two or more devices to
communicate using those formats.
repeater A device that connects two sections of a network and conveys signals between them
without making routing decisions or filtering packets.
RFC Request For Comment. Paper identified by a number in Internet world. They define
the state of art regarding Internet protocols (ruled by IETF = Internet Engineering
Task Force) http://www.ietf.org
router A device that connects two or more sections of a network and allows information to
flow between them. A router examines every packet it receives and decides whether
to block the packet from the rest of the network or transmit it. The router will attempt
to send the packet through the network by the most efficient path.
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