Echelon NodeBuilder FX Manuel d'utilisateur télécharger pdf (Page 26)

12 Introduction

The U10 USB Network Interface connects directly to TP/FT-10 Free Topology Twisted Pair (ISO/IEC

14908-2) L

ONWORKS channels through a high-quality removable connector. The U20 USB Network

Interface connects to PL-20 C-Band Power Line (ISO/IEC 14908-3) L

ONWORKS channels through an

included power supply with integrated coupler. The U20 USB Network Interface can also be

connected directly to 10.8-18VDC power systems (such as those in automobiles, trucks and buses)

without a coupling circuit, or to virtually any powered line through a customer-supplied coupler/power

supply.

The drivers for U10 and U20 USB network interfaces are automatically installed on your computer

when you install the LonMaker Integration Tool CD.

The USB Network Interfaces can be used with virtually any computer-based L

ONWORKS application,

including all LNS

and OpenLDV

™

based applications such as the NodeBuilder Development tool,

LonMaker tool, and LonScanner Protocol Analyzer.

For more information on installing and using the U10 and U20 USB network interfaces, see the

LonWorks USB Network Interface User’s Guide.

Introduction to NodeBuilder Device Development and

LONWORKS Networks

A LONWORKS network consists of intelligent devices (such as sensors, actuators, and controllers) that

communicate with each other using a common protocol over one or more communications channels.

Network devices are sometimes called nodes.

Devices may be Neuron hosted or host-based. Neuron hosted devices run a compiled Neuron C

application on a Neuron Chip or Smart Transceiver. You can use the NodeBuilder tool to develop,

test, and debug Neuron C applications for Neuron hosted devices.

Host-based devices run applications on a processor other than a Neuron Chip or Smart Transceiver.

Host-based devices may run applications written in any language available to the processor. A

host-based device may use a Neuron Chip or Smart Transceiver as a communications processor, or it

may handle both application processing and communications processing on the host processor. The

NodeBuilder tool supports some of the common tasks occurring in the creation of host-based devices;

however, an additional host-based device development tool, such as the ShortStack

2.1 Developer’s

Kit or the FTXL

™

Developer’s Kit, is required.

Each device includes one or more processors that implement the ISO/IEC

14908-1 Control Network

Protocol (CNP). Each device also includes a component called a transceiver to provide its interface to

the communications channel.

A device publishes and consumes information as instructed by the application that it is running. The

applications on different devices are not synchronized, and it is possible that multiple devices may all

try to talk at the same time. Meaningful transfer of information between devices on a network,

therefore, requires organization in the form of a set of rules and procedures. These rules and

procedures are the communication protocol, which may be referred to simply as the protocol. The

protocol defines the format of the messages being transmitted between devices and defines the actions

expected when one device sends a message to another. The protocol normally takes the form of

embedded software or firmware code in each device on the network. The CNP

is an open protocol

defined by the ISO/IEC 14908-1 standard (defined nationally in the United States, Europe, and China

by the ANSI/EIA 709.1, EN 14908, and GB/Z 20177 standards, respectively).

Channels

A channel is the physical media between devices upon which the devices communicate. The LonTalk

protocol is media independent; therefore, numerous types of media can be used for channels: twisted

pair, power line, fiber optics, IP, and radio frequency (RF) to name a few. Channels are categorized

into channel types, and the channel types are characterized by the device transceiver. Common

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Echelon NodeBuilder FX Manuel d'utilisateur Page 26

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