Echelon Series 6000 Chip databook Manual do Utilizador descarregar pdf (Página 15)

Introduction to LONWORKS Networks

In almost every industry, there is a trend away from proprietary control schemes and

centralized systems. The migration towards open, distributed, peer-to-peer networks is

being driven by the need for interoperability, robust technology, faster development time,

and scale economies.

With thousands of application developers and millions of devices installed worldwide, the

ONWORKS system is the leading open solution for building and home automation,

industrial, transportation, and public utility control networks. A control network is any

group of devices working in a peer-to-peer fashion to monitor sensors, control actuators,

communicate reliably, manage network operation, and provide complete access to network

data. 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 ISO/IEC 14908-1

(ANSI/CEA 709.1-B and 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 3. The implementation of these layers

in a L

ONWORKS device provides standardized interconnectivity for devices within a

ONWORKS network.

Table 3. 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

Series 6000 Chip Data Book 3

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 180 181

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