Echelon FTXL Bedienungsanleitung Seite 14

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2 Introduction to FTXL
Overview
Automation solutions for buildings, homes, and industrial applications include
sensors, actuators, and control systems. A
LONWORKS network
is a peer-to-peer
network that uses an industry-standard control network protocol for monitoring
sensors, controlling actuators, communicating with devices, and managing
network operation. In short, a L
ONWORKS network provides communications and
complete access to control network data from any device in the network.
The communications protocol used for L
ONWORKS networks is the ANSI/CEA
709.1-B (EN14908.1) Control Network Protocol. This protocol is an international
standard seven-layer protocol that has been optimized for control applications
and is based on the Open Systems Interconnection (OSI) Basic Reference Model
(the OSI Model, ISO standard 7498-1). The OSI Model describes computer
network communications through the seven abstract layers described in
Table 2.
The implementation of these layers in a L
ONWORKS device provides standardized
interconnectivity for devices within a L
ONWORKS network.
Table 2. L
ONWORKS Network Protocol Layers
OSI Layer Purpose Services Provided
7 Application Application compatibility Network configuration, self-installation,
network diagnostics, file transfer,
application configuration, application
specification, alarms, data logging,
scheduling
6 Presentation Data interpretation Network variables, application messages,
foreign frame transmission
5 Session Control Request/response, authentication
4 Transport End-to-end
communication reliability
Acknowledged and unacknowledged
message delivery, common ordering,
duplicate detection
3 Network Destination addressing Unicast and multicast addressing,
routers
2 Data Link Media access and framing Framing, data encoding, CRC error
checking, predictive carrier sense
multiple access (CSMA), collision
avoidance, priority, collision detection
1 Physical Electrical interconnect Media-specific interfaces and modulation
schemes
Echelon’s implementation of the ANSI/CEA-709.1 Control Network Protocol is
called the
LonTalk protocol
. Echelon has implementations of the LonTalk
protocol in several product offerings, including the Neuron firmware (which is
included in a ShortStack
®
Micro Server), LNS
®
Server, LNS remote client,
i
.LON
®
servers, and the FTXL LonTalk protocol stack. This document refers to
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