Niagara Lonworks Integration Guide

Total Page:16

File Type:pdf, Size:1020Kb

Niagara Lonworks Integration Guide Technical Publications Niagara LonWorks Integration Guide Revised: December 16, 2002 Tridium, Inc. 3951 Westerre Parkway • Suite 350 Richmond, Virginia 23233 USA http://www.tridium.com Phone 804.747.4771 • Fax 804.747.5204 Copyright Notice: The software described herein is furnished under a license agreement and may be used only in accordance with the terms of the agreement. This document may not, in whole or in part, be copied, photocopied, reproduced, translated, or reduced to any electronic medium or machine-readable form without prior written consent from: Tridium, Inc., 3951 Westerre Parkway, Suite 350 Richmond, Virginia 23233. The confidential information contained in this document is provided solely for use by Tridium employees, licensees, and system owners. It is not to be released to, or reproduced for, anyone else; neither is it to be used for reproduction of this control system or any of its components. All rights to revise designs described herein are reserved. While every effort has been made to assure the accuracy of this document, Tridium shall not be held responsible for damages, including consequential damages, arising from the application of the information given herein. The information in this document is subject to change without notice. The release described in this document may be protected by one of more U.S. patents, foreign patents, or pending applications. Trademark Notices: Microsoft and Windows are registered trademarks, and Windows 95, Windows NT, and Internet Explorer are trademarks of Microsoft Corporation. Java and other Java-based names are trademarks of Sun Microsystems Inc. and refer to Sun’s family of Java-branded technologies. Communicator and Navigator are registered trademarks of Netscape Communications Corporation. Echelon, LON, LonMark, LonTalk, and LonWorks are registered trademarks of Echelon Corporation. Tridium Niagara, the Niagara Framework, Vykon, WorkPlace Pro, Web Supervisor, JACE-4, JACE-5, and JACE-NP are trademarks of Tridium Inc. All other product names and services mentioned in this publication that are known to be trademarks, registered trademarks, or service marks have been appropriately capitalized and are the properties of their respective owners. Niagara LonWorks Integration Guide © 2002, Tridium, Inc. All rights reserved. C ONTENTS PREFACE About This Document 9 Intended Audience. 9 Document Summary . 10 Formatting Conventions . 11 Important Information Indicators . 11 Related Documentation . 12 Sources . 12 Additional Information . 12 Commonly Used Terms. 13 CHAPTER 1 Introduction to Open Systems 1-1 Parts of a Control System . 1-1 Hardware. 1-1 Software . 1-3 Architecture. 1-3 Interconnectivity in Control Systems . 1-5 Gateways. 1-5 Host Bridges . 1-7 Openness in Control Systems . 1-9 CHAPTER 2 LonWorks Overview 2-1 LonWorks . 2-1 Echelon Corporation . 2-2 Applications and Distribution Channels . 2-3 LonMark . 2-3 CHAPTER 3 LonWorks Design Concepts 3-1 LANs and LONs . 3-1 LonTalk Protocol. 3-2 Smart Devices . 3-2 Niagara Release 2.3 1 Niagara LonWorks Integration Guide Revised: December 16, 2002 Contents Network Architecture. 3-3 Centralized Control System. 3-3 Fully Distributed (Flat) Control System . 3-4 Semi-Distributed Control System . 3-5 CHAPTER 4 LonWorks Architecture 4-1 Elements Overview . 4-1 The Neuron Chip . 4-2 Neuron Chip Data Structures. 4-2 Processing Units . 4-3 Network Image . 4-3 Domain Table . 4-5 Address Table . 4-5 Network Variable Tables. 4-5 Hosted Nodes . 4-6 Transceivers, Media, and Network Topology . 4-6 FTT-10 Topology . 4-7 Channels . 4-10 Routers. 4-11 Routers versus Repeaters. 4-11 How Learning Routers Work . 4-12 Learning Routers versus Configured Routers . 4-13 LonWorks Network Interface . 4-13 CHAPTER 5 LonTalk Protocol 5-1 LonTalk . 5-2 A Closer Look at the LonTalk Protocol . 5-2 Logical Addressing . 5-4 Domain . 5-4 Subnet . 5-5 Node Address . 5-6 Groups . 5-6 Addressing Formats. 5-7 Routing Messages . 5-7 Communications Services . 5-7 Acknowledged Service . 5-8 Request/Response Service. 5-8 Niagara Release 2.3 2 Niagara LonWorks Integration Guide Revised: December 16, 2002 Contents Repeated Service. 5-8 Unacknowledged Service . 5-8 Collision Detection . 5-9 Timers . 5-9 Free Buffer Wait Timer . 5-9 Transaction Timer. 5-10 Receive Timers . 5-10 Repeat Timer. 5-10 Optional Priority . 5-10 Authentication . 5-11 CHAPTER 6 Interoperability 6-1 LonMark Interoperability Association . 6-1 Network Variables. 6-2 Network Variable Restrictions . 6-3 Standard Network Variable Types (SNVTs) . 6-3 Structured SNVTs. 6-4 Enumerated Lists . 6-5 Configuration Properties . 6-5 Explicit Messages . ..
Recommended publications
  • Introduction to LONWORKS System
    Introduction to the LONWORKS® System Version 1.0 C o r p o r a t i o n 078-0183-01A Echelon, LON, LONWORKS, LonPoint, LonTalk, Neuron, LONMARK, 3120, 3150, the LonUsers logo, the Echelon logo, and the LONMARK logo are registered trademarks of Echelon Corporation. LonMaker and LonSupport are trademarks of Echelon Corporation. Other brand and product names are trademarks or registered trademarks of their respective holders. Neuron Chips, LonPoint 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 LonPoint 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. Copyright © 1999 by Echelon Corporation.
    [Show full text]
  • Lonworks® Platform Revision 2
    Introduction to the LonWorks® Platform revision 2 ® 078-0183-01B Echelon, LON, LonWorks, LonMark, NodeBuilder, , LonTalk, Neuron, 3120, 3150, LNS, i.LON, , ShortStack, LonMaker, the Echelon logo, and are trademarks of Echelon Corporation registered in the United States and other countries. LonSupport, , , OpenLDV, Pyxos, LonScanner, LonBridge, and Thinking Inside the Box are trademarks of Echelon Corporation. Other trademarks belong to their respective holders. Neuron Chips, Smart Transceivers, 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 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. Copyright
    [Show full text]
  • L-IP User Manual 11 LOYTEC
    L-IP CEA-709/IP Router User Manual LOYTEC electronics GmbH Contact LOYTEC electronics GmbH Blumengasse 35 1170 Vienna AUSTRIA/EUROPE [email protected] http://www.loytec.com Version 7.4 Document № 88065915 LOYTEC MAKES AND YOU RECEIVE NO WARRANTIES OR CONDITIONS, EXPRESS, IMPLIED, STATUTORY OR IN ANY COMMUNICATION WITH YOU, AND LOYTEC SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. THIS PRODUCT IS NOT DESIGNED OR INTENDED FOR USE IN EQUIPMENT INTENDED FOR SURGICAL IMPLANT INTO THE BODY OR OTHER APPLICATIONS INTENDED TO SUPPORT OR SUSTAIN LIFE, FOR USE IN FLIGHT CONTROL OR ENGINE CONTROL EQUIPMENT WITHIN AN AIRCRAFT, OR FOR ANY OTHER APPLICATION IN WHICH IN THE FAILURE OF SUCH PRODUCT COULD CREATE A SITUATION IN WHICH PERSONAL INJURY OR DEATH MAY OCCUR. LOYTEC MAKES NO REPRESENTATION AND OFFERS NO WARRANTY OF ANY KIND REGARDING OF ANY THIRDPARTY COMPONENTS MENTIONED IN THIS MANUAL. 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 LOYTEC. LC3020, L-Chip, L-Core, L-DALI, L-GATE, L-INX, L-IOB, LIOB-Connect, LIOB-FT, L-IP, LPA, L-Proxy, L-Switch XP, L- Term, L-VIS, L-WEB, L-ZIBI and ORION™ stack are trademarks of LOYTEC electronics GmbH. LonTalk®, LONWORKS®, Neuron®, LONMARK®, LonMaker®, i.LON®, and LNS® are trademarks of Echelon Corporation registered in the United States and other countries. L-IP CEA-709 User Manual 3 LOYTEC Contents 1 Introduction ...............................................................................................
    [Show full text]
  • Network & Wireless
    NETWORK & WIRELESS HUMIDITY & WIRELESS Kele Has Doubled the Offering of Network and Wireless Solutions, NETWORK and Continues to Add to Our Options to Meet Your Needs. Babel Buster | p. 719 L-VIS Series | p. 721 BASRT-B | p. 727 Series 110A | p. 733 ValuPoint VP4-23 | p. 744 EKI Series | p. 738 Series NETWORK & WIRELESS Products manufactured MODEL/SERIES PAGE in the United States Network Display and Control Panels Wireless EnOcean and ZigBee Devices L-VIS Series — BACnet and LON Touch Panel . 721 and Systems (cont.) Products that are BBC-SD — BACnet Graphic Display . 724 E3T-SxE Series — EnOcean Wireless European new to the catalog WebOP Series — Touchscreen Operator Display Light Switches . 826 Panel . 725 E3T-S2H Series — EnOcean Wireless Handheld Remote . 827 Network Gateways EasySens Thanos — EnOcean Room Operating ETH-1000 — Provides connectivity between Ethernet Panel . .. 830 and RS-485 based networks . 713 EasySens Receiver Gateways — EnOcean Receiver XLTR-1000 — Provides Connectivity Between Two Gateways . 831 Rs-485 Based Networks . 714 EasySens SRC Receiver Controllers — EnOcean Raptor Protocol Converter — RLE Technologies Receiver Controllers . 832 Protocol Coverter . 715 EasySens Repeater — EnOcean Wireless LGATE-9xx Series — Lonworks/Bacnet And Repeater . 833 Universal Gateways . 717 EasySens Switches — EnOcean Lighting, Blinds Babel Buster Series — BACnet - Modbus - SNMP and Shutters Switches . 834 Gateways . 719 EasySens Specialty Wireless Transmitters — AddMe® Series — BACnet - Modbus Network I/O . 743 EnOcean Remote Control, Key Card Switch, Window/Door Contact . 835 Network I/O Modules EasySens Room Sensors — EnOcean Temperature, Humidity and CO2 Sensors . 836 L-IOB Series — BACnet and LON I/O Module . 739 EasySens Temperature Sensors — EnOcean i.CanDoIt Series — Embedded Network Servers 742 Surface, Duct, Remote and Outdoor AddMe® Series — BACnet - Modbus Network I/O .
    [Show full text]
  • Lonworks Twisted Pair Control Module User's Guide
    LONWORKS® Twisted Pair Control Module User’s Guide 078-0015-01F Echelon, LONWORKS, LONMARK, NodeBuilder, LonTalk, Neuron, 3120, 3150, ShortStack, LonMaker, and the Echelon logo are trademarks of Echelon Corporation registered in the United States and other countries. Other brand and product names are trademarks or registered trademarks of their respective holders. Smart Transceivers, Neuron Chips, 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 Smart Transceivers or Neuron Chips 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. Copyright © 1992, 2011 Echelon Corporation. Echelon Corporation www.echelon.com Welcome Echelon’s LONWORKS® Twisted Pair Control Modules contain the core elements for device designs using LONWORKS technology. The core elements of a control module are an FT 5000 Smart Transceiver or Neuron® 3150® Chip, crystal clock circuit, I2C EEPROM or JEDEC MO-052 AE PLCC memory socket (32-pin rectangular), Communications Transformer or twisted pair transceiver, and unbuffered access to the I/O, SERVICE~, and RESET~ signals.
    [Show full text]
  • And Tec220x-4(+PIR) Series LONWORKS Network Staged Thermostat Controllers
    TEC226x-4(+PIR) and TEC220x-4(+PIR) Series LONWORKS® Network Staged Thermostat Controllers Code No. LIT-12011611 Technical Bulletin Issued February 8, 2010 Network Variables (NVs) and Configuration Parameters (CPs) List. 3 Network Variable Inputs (NVIs) Table . 8 Network Variable Outputs (NVOs) Table . 10 Configuration Properties (CPs) . 13 Space Comfort Controller Object . 18 Commissioning the Thermostat Using a LONWORKS Network Configuration Tool . 18 Service Pin . 19 TEC22xx-4 Configuration Plug-in. 19 Installing the Plug-in. 19 Registering the Plug-in. 20 Using LN Browser to Display NVs, NCIs, and CPs . 22 Running the Plug-in . 27 Heating - Cooling Tab . 31 Hardware Tab . 32 General Tab . 33 Model Tab . 34 Scheduler Tab . 36 Network Tab . 38 About Tab . 39 Adding a Thermostat to the Network Automation Engine (NAE) . 39 LONWORKS Thermostat Controller Mapping . 40 Preparation . 40 Troubleshooting Guide . 40 Technical Specifications . 43 TEC226x-4(+PIR) and TEC220x-4(+PIR) Series LONWORKS Network Staged Thermostat Controllers . 43 TEC226x-4(+PIR) and TEC220x-4(+PIR) Series LONWORKS® Network Staged 1 Thermostat Controllers Technical Bulletin 2 TEC226x-4(+PIR) and TEC220x-4(+PIR) Series LONWORKS® Network Staged Thermostat Controllers Technical Bulletin TEC226x-4(+PIR) and TEC220x-4(+PIR) Series LONWORKS® Network Staged Thermostat Controllers Technical Bulletin Network Variables (NVs) and Configuration Parameters (CPs) List Table 1 shows the NVs and CPs for the TEC226x-4(+PIR) and TEC220x-4(+PIR) Series Thermostat Controllers. Each Network Variable Input (NVI), Network Variable Output (NVO), and Network Configuration Input (NCI) has a reference number as defined in the XIF Resource File, and some objects have a subcategory number.
    [Show full text]
  • Tec22x6(H)-2 Series LONWORKS® Network Thermostats with Two Outputs, Dehumidification Capability, and Three Code No
    TEC22x6(H)-2 Series LONWORKS® Network Thermostats with Two Outputs, Dehumidification Capability, and Three Code No. LIT-12011118 Speeds of Fan Control Issued August 11, 2006 Product Bulletin Supersedes May 24, 2006 The TEC22x6(H)-2 Series Thermostats are LONWORKS® network devices that provide control of two- or four-pipe fan coils, cabinet unit heaters, or other equipment using on/off, floating, or proportional 0 to 10 VDC control input, dehumidification capability, and up to three speeds of fan control. The technologically advanced TEC22x6(H)-2 Series Thermostats feature a Building Automation System (BAS) LONWORKS network communication capability that enables remote monitoring and programmability for efficient space temperature control. Specific models are available to accommodate commercial and hospitality applications. The TEC22x6(H)-2 Series Thermostats feature an intuitive user interface with backlit display that makes setup and operation quick and easy. The thermostats also employ a unique, Proportional-Integral (PI) time-proportioning algorithm that virtually eliminates Figure 1: TEC22x6-2 Series LONWORKS temperature offset associated with traditional, Network Thermostat with Two Outputs, differential-based thermostats. Dehumidification Capability, and Three Speeds of Fan Control Table 1: Features and Benefits Features Benefits LONWORKS Network Communication Provides compatibility with a proven communication network; LONWORKS network is widely accepted by Heating, Ventilating, and Air Conditioning (HVAC) control suppliers. Integral Humidity Sensing Capability and Increases occupancy comfort by providing dehumidification. Dehumidification Capability (Dehumidification Models) Backlit Liquid Crystal Display (LCD) Offers real-time control status of the environment in easy-to-read, English plain text messages with constant backlight that brightens during user interaction. On/Off, Floating, or Proportional 0 to 10 VDC Offers additional application flexibility by providing more advanced control Control signals.
    [Show full text]
  • System Controllers PXC001.D PXC001-E.D PXA40-RS
    s 9223 Desigo™ PX System controllers PXC001.D PXC001-E.D PXA40-RS... for the integration of third-party devices and systems in Desigo • Integration platforms and system controllers for third-party devices and systems via KNX, Modbus, M-Bus and other protocols into the automation level via BACnet • System controllers for the integration of Desigo RXB/RXL room controllers • Native BACnet devices with communication via BACnet/LonTalk or BACnet/IP • BTL label (BACnet communications passed the BTL test) • Comprehensive management and system functions (alarm management, time scheduling, trends, remote management, access protection etc.) • Supports operation via local or network-compatible operator units PXM… CM1N9223en_08 2017-04-11 Building Technologies Use • The system controllers support the integration of Desigo RXB/RXL room controllers as well as third-party devices and systems via KNX, Modbus or M- Bus etc. in the automation level using BACnet/LonTalk or BACnet/IP • Mapping and monitoring of third-party disciplines as HVAC, light, SPS etc. • Functionality as freely programmable system controllers for standard or proprietary protocol applications Functions • The system controllers provide the infrastructure to hold and execute the system and application specific functions. They are freely programmable. • Comprehensive management and system functions are available: − Alarm management − Time scheduling − Trends − Access protection Type summary System controllers Type System-Controller for the integration of KNX, M-Bus, Modbus PXC001.D or
    [Show full text]
  • Open Systems for Homes and Buildings: Comparing Lonworks and KNX Alan Kell Peter Colebrook I&I Limited
    Open Systems for Homes and Buildings: Comparing LonWorks and KNX Alan Kell Peter Colebrook i&i limited No part of this publication may be transmitted or reproduced in any form or by any means, electronic or mechanical, for any purpose, without the prior written permission of i&i limited. Trademarks and Logos i&i and Proplan are trademarks of i&i limited. KNX, EIB, European Installation Bus, EHS, European Home Systems and BatiBUS are trademarks of The Konnex Association and its constituent associations; European Installation Bus Association (EIBA), European Home Systems Association (EHSA) and Club BatiBUS International (BCI). Echelon, LON, LONWORKS, LONMARK, LonBuilder, NodeBuilder, LonManager, LonTalk, LonUsers, LonPoint, Digital Home, Neuron, 3120, 3150, LNS, i.LON, LONWORLD, the Echelon logo, and the LonUsers logo are trademarks of Echelon Corporation registered in the United States and other countries. LonMaker, Panoramix, and Networked Energy Services Powered by Echelon are trademarks of Echelon Corporation. All other brand names and product names are trademarks or registered trademarks of their respective holders. About i&i limited Alan Kell was the principal author of the 1993 study by DEGW etl1 entitled “Bus Systems for Building Control” which was the first detailed study in this area to compare, among others, EIB and LONWORKS in the context of building control. Peter Colebrook collaborated closely with Siemens in Regensburg in the late 1980’s, was one of the 12 founder signatories of the European Installation Bus Association (EIBA) and subsequently served as a Director of that Association. He was also one of the founders of the LONMARK Interoperability Association and similarly served as a Director of that Association.
    [Show full text]
  • Modeling of Lontalk Algorithm in Control Networks
    Proceedings of COBEM 2007 |19 th International Congress of Mechanical Engineering Copyright © 2007 by ABCM November, 5 - 9, 2007, Brasília, DF MODELING OF LONTALK ALGORITHM IN CONTROL NETWORKS Percy Javier Igei Kaneshiro University of São Paulo, Escola Politécnica, São Paulo, SP, BRAZIL [email protected] José Isidro Garcia Melo University of São Paulo, Escola Politécnica, São Paulo, SP, BRAZIL University of Valle, Faculty of Engineering, Cali, CA, COLOMBIA [email protected] Paulo E. Miyagi University of São Paulo, Escola Politécnica, São Paulo, SP, BRAZIL [email protected] Carlos E. Cugnasca University of São Paulo, Escola Politécnica, São Paulo, SP, BRAZIL [email protected] Abstract. The industrial organization of productive processes have presented a tendency for dispersion and distribution of manufacturing plants based on an increase of resources and functionality of information and mobility technology. In this sense, Local Operating Networks (LON, LonWorks) is the name of one of the leading technologies in sensor/control networking, addressed to a wide range of applications with topology free technology. In spite of its popularity, only a few design tools are available to simulate LonWorks architectures and predict their performance. In this paper, a model of the collision resolution algorithm of LonWorks is described. The approach developed in this work is based on the characterization of LonWorks networks as Discrete Event Dynamic Systems (DEDS), since dynamic behavior is defined through the discrete events and discrete states. The proposed procedure employs techniques that are derived from interpreted Petri net, which has been used as an efficient tool for modeling, analysis and control of DEDS.
    [Show full text]
  • Injection Mixing from Thermal Storage an Established Technique That Can Be Used in Renewable Energy Systems
    Renewable Heating Design John Siegenthaler, P.E. | [email protected] Injection mixing from thermal storage An established technique that can be used in renewable energy systems. any hydronic-based renewable radiators on the second floor. The idea is to valves and are not familiar with variable- energy systems include thermal select a maximum supply water temperature speed injection mixing as an option. And M storage tanks. When the heat input for the entire system based on design-load while mixing valves can certainly accomplish is from solar thermal collectors or biomass conditions and then match the various heat the intended task, there are scenarios where boilers, it is possible for the water tempera- emitters to the room loads based on their variable-speed injection mixing may be less ture in those tanks to reach temperatures of respective heat output rates at the selected expensive because it provides both fluid transport 180-200º F. Thermal storage tanks supplied supply temperature. and mixing, thus eliminating the need for a by electric boilers operating on off-peak elec- The combination of high-temperature circulator in combination with a mixing valve. tricity also can reach these high temperatures water in thermal storage and low-tempera- by the end of the charging cycle. ture heat emitters necessitates some type of Hot in/Cool out Although few would argue a 500 gal. tank mixing assembly between these subsystems. Injection mixing is simply a way to add hot filled with 190º water doesn’t contain a lot of There are several mixing options includ- water to a circulating hydronic distribution sys- energy, the usefulness of that energy depends ing thermostatically actuated and motorized tem while at the same time removing an equal on the supply temperature required by the three-way mixing valves or injection mixing amount of cooler water.
    [Show full text]
  • Bacnet™ and Lonworks®: Compared and Contrasted
    BACnet and LONWORKS : Compared and Contrasted ® PolarSoft Inc. David Fisher, PolarSoft Inc. 914 South Aiken Avenue May 2004 Pittsburgh PA 15232-2212 412.683.2018 voice 412.683.5228 fax Introduction [email protected] Over the course of the past 20 years, building owners, managers and www.polarsoft.biz consulting/specifying engineers have become increasingly frustrated by incompatibilities and limited opportunities for the integration of building automation and control systems. Although the sophistication and flexibility of networking and communications technologies in general have been increasing geometrically, controls systems for buildings have carried forward a legacy of proprietary thinking which has impeded the natural migration of many of the benefits of open networking technology into building systems. The bottom line effect has been that, while many modern building automation and control systems incorporate some of the latest advances in networking technology, the benefits of interoperability, configuration flexibility, and performance-based pricing have yet to be realized by building owners and operators. Through accident or intent, building automation and controls systems have simply failed to embrace true open systems concepts effectively for building owners. Several solutions have come into widespread use and are changing this situation permanently and dramatically. One such solution is called BACnet: The Building Automation and Controls Network. BACnet is an international standard for computers used in building automation and controls systems that was developed between 1987 and 1995 by ASHRAE. In December of 1995, BACnet was also adopted by ANSI, and is now an American National Standard (ANSI/ASHRAE 135-1995, ANSI/ASHRAE 135-2001, ANSI/ASHRAE 135-2004).
    [Show full text]