Echelon LonWorks LPT-11 Manuale utente

LONWORKS®

LPT-11 Link Power

Transceiver

User’s Guide

Version 1

ECHELON®

C o r p o r a t i o n

078-0198-01A

Echelon, LON, LONWORKS,LonBuilder, NodeBuilder, LonTalk, LNS,

LONMARK, LonPoint, Neuron, 3120, 3150, and the Echelon logo are

trademarks of Echelon Corporation registered in the United States and

other countries. LonSupport and LonMaker are trademarks of Echelon

Corporation

Other brand and product names are trademarks or registered

trademarks of their respective holders.

Neuron Chips, Link Power Twisted Pair Transceiver Modules, and other

OEM Products were not designed for use in equipment or systems

which involve danger to human health or safety or a risk of property

damage and Echelon assumes no responsibility or liability for use of

the Neuron Chips or Link Power Twisted Pair Transceiver Modules in

such applications.

Parts manufactured by vendors other than Echelon and referenced in

this document have been described for illustrative purposes only, and

may not have been tested by Echelon. It is the responsibility of the

customer to determine the suitability of these parts for each

application.

ECHELON MAKES AND YOU RECEIVE NO WARRANTIES OR

CONDITIONS, EXPRESS, IMPLIED, STATUTORY OR IN ANY

COMMUNICATION WITH YOU, AND ECHELON SPECIFICALLY DISCLAIMS

ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A

PARTICULAR PURPOSE.

No part of this publication may be reproduced, stored in a retrieval

system, or transmitted, in any form or by any means, electronic,

mechanical, photocopying, recording, or otherwise, without the prior

written permission of Echelon Corporation.

Printed in the United States of America.

Echelon Corporation

www.echelon.com

Contents

1 Introduction 1-1

Applications 1-3

Audience 1-5

Content 1-5

Related Documentation 1-6

2 Electrical Interface 2-1

LPT-11 Pinout 2-2

Network Connection 2-4

Clock Input 2-4

Neuron®Chip Communications Port (CP) Lines 2-4

PC Board Layout Guidelines 2-4

Choosing the Inductor and Capacitors for the LPT-11 Switching Power

Supply 2-7

Alternative Inductor and Capacitor Selection for Low-Current

Applications 2-9

3 Mechanical Considerations 3-1

Mechanical Footprint 3-2

4 Power Output 4-1

Transceiver Output Power 4-2

Powering Non-Isolated Devices 4-4

5 Network Cabling and System Performance 5-1

Network Overview 5-2

System Performance and Cable Selection 5-4

System Specifications 5-5

Transmission Specifications 5-5

Power Specifications, Simplified Form 5-6

Power Specifications for Extended Performance 5-8

Cable Termination 5-13

Commissioning LPT-11 Transceivers 5-13

LONWORKS LPT-11 Transceiver User’s Guide iii

iv Contents

6 Design Issues 6-1

EMI Design Issues 6-2

Designing Systems for EMC (Electromagnetic Compatibility) 6-2

ESD Design Issues 6-5

Designing Systems for ESD Immunity 6-5

Surge Design Issues 6-6

Designing Systems for Surge Immunity 6-6

Building Entrance Protection 6-7

EN 61000-4 Electromagnetci Compatibility (EMC) Testing 6-8

7 Programming Considerations 7-1

Application Program Development and Export 7-2

LonBuilder®Developer's Workbench 7-2

Development Hardware Setup 7-2

Release Hardware Setup 7-4

NodeBuilder®Development Tool 7-5

Development Hardware Setup 7-5

Release Hardware Setup 7-5

8 References 8-1

Reference Documentation 8-2

Appendix A - Physical Layer Repeaters A-1

Physical Layer Repeaters A-2

Appendix B - Differences Between LPT-10 and LPT-11 B-1

Differences Between LPT-10 and LPT-11 Link Power Transceivers B-2

Functional Differences B-2

Differences in Form B-2

Modifications for Migrating from the LPT-10 to the LPT-11 Transcevier B-3

Appendix C - LPT-11 Transceiver-Based Device Checklist C-1

LPT-11 Transceiver-Based Device Checklist C-2

LPT-11 Transceiver and Neuron Chip Connections C-2

LPT-11 PCB Layout C-2

LPT-11 DC-DC Converter C-3

LPT-11 Transient Immunity C-4

LPT-11 Transceiver Programming C-4

Link Power Network Considerations C-4

LPT-11 Physical Layer Repeater C-5

Introduction

The LPT-11 Link Power Twisted Pair Transceiver provides a simple,

cost effective method of adding a network-powered LONWORKS

transceiver to any Neuron®Chip-based sensor, activator, display,

lighting device, or general purpose I/O controller. The LPT-11

transceiver consists of a Single In-Line Package (SIP) containing a

78kbps differential Manchester coded communication transceiver, a

switching power supply that draws power from the twisted pair

network, and connections for the Neuron Chip Communications Port

(CP) lines and the twisted pair network. The LPT-11 transceiver

eliminates the need to use a local power supply for each device, since

device power is supplied by a central power supply over the same

twisted wire pair that handles network communications. Up to 128

devices can be supported on a single free topology network segment.

LONWORKS LPT-11 Transceiver User’s Guide 1-1

The LPT-11 transceiver supports free topology wiring, freeing the system installer

from the need to wire in a doubly-terminated bus arrangement. Star, bus, and loop

wiring are all supported by this architecture. Free topology wiring reduces the time

and expense of system installation by allowing the wiring to be installed in the most

expeditious manner. It also simplifies network expansion by alleviating the need for

the installer to follow strict rules about stub lengths. Should it be necessary to add

more devices or wire in excess of the system limits, then two or more link power

systems can be interconnected with an inexpensive, physical layer repeater. The

LPT-11 contains built-in circuitry to allow connection to one or more FTT-10A

transceivers back-to-back to make a repeater. The LPT-11 transceiver includes an

integral switching power supply that can furnish +5VDC at up to 100mA. The LPT-

11 transceiver derives its power directly from the switching power supply, leaving up

to 100mA of current for a Neuron Chip, application electronics, sensors, actuators,

and displays. The high current capability of the LPT-11 transceiver eliminates the

need for local power supplies at each device, resulting in equipment and labor cost

savings.

The LPT-11 transceiver is compatible with Echelon's FTT-10A Free Topology

Transceiver and FT 3120®/FT 3150®Smart Transceivers (referred to hereafter as FT

31xx devices), and these transceivers can communicate with each other on a single

twisted pair cable. This capability provides an inexpensive means of interfacing to

devices whose current and/or voltage requirements would otherwise exceed the

capacity of the link power segment. When equipped with an FTT-10A or FT 31xx

transceiver, these devices can be operated from a local power supply without the

need for additional electrical isolation from the link power network.

Using the LPT-11 transceiver can save literally thousands of hours of development

time compared with a custom-designed transceiver. The LPT-11 transceiver is

designed to comply with FCC, CE, ICES-003, CISPR22, EN55022, EN55024, and

EN61000-4 EMC requirements, minimizing time consuming and expensive laboratory

transceiver testing. As a UL, cUL, and TuV recognized component, the LPT-11

transceiver can be integrated into a product with minimal additional safety testing of

the LPT-11 transceiver module. The LPT-11 transceiver also meets LONMARK®

interoperability standards.

1-2 Introduction

Applications

A conventional control system using bus topology wiring (such as RS-485) consists of

a network of sensors and control outputs that are interconnected using a shielded

twisted pair wire. In accordance with EIA RS-485 guidelines, all of the devices must

be wired in a bus topology to limit electrical reflections and ensure reliable

communications. There is a high cost associated with installing and maintaining the

cable plant that links together the many elements of an RS-485-based control

system. Bus topology wiring is more time consuming and expensive to install

because the installer is unable to branch or star the wiring where convenient; all

devices must be connected directly to the main bus. The installation of local power

supplies for each device is especially expensive since it usually involves an AC mains

connection.

Installing separate data and power wiring also implies that a technician's time will

be spent troubleshooting the wiring harness to isolate and repair cable faults.

Moreover, each time a sensor is added or an actuator is moved, both data and power

wiring must be changed accordingly, often resulting in network down time until the

new connections can be established.

The best solution for reducing installation and maintenance costs and simplifying

system modifications is a free topology communication system that combines power

and data on a common twisted wire pair. Echelon's link power technology offers just

such a solution, and provides an elegant and inexpensive method of interconnecting

the different elements of a distributed control system.

The link power system sends power and data on a common twisted wire pair, and

allows the user to wire the control devices with virtually no topology restrictions.

Power is supplied by a customer-furnished nominal 48VDC power supply, and flows

through an LPI-10 Power Supply Interface onto the twisted pair wire (figure 1.1).

The LPI-10 module isolates the power supply from wiring faults on the twisted pair,

couples power to the system wiring, and terminates the twisted pair network.

There are two versions of the LPI-10 interface: a simple, low-cost, inductor-based

design intended for customers who are building power supplies, and an electronic

LPI-10 interface designed for use with off-the-shelf 48VDC power supplies.

LONWORKS LPT-11 Transceiver User’s Guide 1-3

Figure 1.1 Free Topology Link Power System Example

LPT-11 Link Power Transceivers located along the twisted wire pair include integral

switching power supplies. These supplies regulate the voltage on the twisted pair

down to +5VDC at currents up to 100mA for use by the Neuron Chip and the various

sensors, actuators, and displays. If a high current or high voltage device must be

controlled, then the +5VDC power can be used to trigger an isolating high current

triac, relay, or contactor.

The integral power supply does away with the need for a local AC-to-DC power

supply, charging circuit, battery, and the related installation and labor expenses.

The savings in money and time that results from eliminating the local power supply

can be up to 20% of the total system cost; the larger the system, the greater the

savings. Moreover, if standby batteries are used, then additional savings will be

realized throughout the life of the system, since only one set of batteries will require

service.

The link power system uses a single point of ground, at the LPI-10 module, and all of

the LPT-11 transceivers electrically float relative to the local ground. Differential

transmission minimizes the effects of common mode noise on signal transmission. If

grounded sensors or actuators are used, then either the communication port (CP) or

the I/O lines of the Neuron Chip must be electrically isolated.

Unlike bus wiring designs, the link power system uses a wiring scheme that supports

star, loop, and/or bus wiring (figure 1.2). This design has many advantages:

1. The installer is free to select the method of wiring that best suits the installation,

reducing the need for advanced planning and allowing last minute changes at

the installation site.

1-4 Introduction

2 If installers have been trained to use one style of wiring for all installations, free

topology technology can be introduced without requiring retraining.

3. Retrofit installations with existing wiring plants can be accommodated with

minimal rewiring, if any. This capability ensures that FT 3120 and FT 3150

Smart Transceiver technology can be adapted to both old and new projects.

4. Free topology permits FT 3120 and FT 3150 Smart Transceiver systems to be

expanded in the future by simply tapping into the existing wiring where it is

most convenient to do so. This reduces the time and expense of system

expansion, and from the customer's perspective, keeps down the life cycle cost of

the free topology network. See Chapter 5, Network Cabling and Performance, for

a presentation of the five different network topologies.

System expansion is simplified in another important way, too. Each link power

transciever incorporates a repeater function. If a link power system grows beyond

the maximum number of transceivers or total wire distance, then additional link

power systems can be added by interconnecting transceivers using the repeater

function. The repeaters will transfer LonTalk®packets between the two systems,

doubling the number of transceivers as well as the length of wire over which they

communicate. The repeater function permits a link power system to grow as system

needs expand, without retrofitting existing controllers or requiring the use of

specialized bridges. Note that systems requiring high levels of network traffic may

benefit from the use of LONWORKS routers which forward packets only when

necessary. See Appendix A for more details.

Audience

This user guide is for developers of Link Power Transceiver-based LONWORKS

devices and systems.

Content

This manual provides detailed technical specifications on the electrical and

mechanical interfaces and operating environment characteristics for the LPT-11

transceiver module.

This document also provides guidelines for migrating applications from a

LonBuilder® Developer’s Workbench Emulator or NodeBuilder® Developer's Tool to

a transceiver module-based product design. Vendor sources are included to simplify

the task of integrating the transceiver module with application electronics.

LONWORKS LPT-11 Transceiver User’s Guide 1-5

1-6 Introduction

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