1. Open System Benefits Why It’s the Best Choice?

2. 2 Open Systems Offer Features/Benefits End Users Want  Seamless interoperability of system level control applications  Incorporation of industry standards  Investment protection to eliminate system obsolescence  Easy system expansions without locking in to a single vendor  Ability to select best in class new technology for the application

3. 3 Changing Roles  End users are more active in defining system capabilities  Engineers specify what end users want, not what manufacturers offer  Engineers must increase focus on controls supplier capabilities, not just product specifications  Open systems offer many options:  Control system communication protocols  Systems integration capabilities  System access options

4. 4 Open Systems Standards  Open systems are used in every day life  Home wiring – common wiring, plugs and voltages  Light bulbs – common bases and lumen ratings  Vehicle fuel – common octane grades and distribution  They all incorporate a systemized set of standards  Commonly accepted data criteria  Widely understood information format  Easily obtained from many manufacturers

5. 5 Open Systems Communications Protocols  Open communication protocol standards allow products from different manufacturers to work together  Common business world open standards  Computer Industry - Windows® Based PC, LINUX  PC Communication - Ethernet  Internet communication – http://www.

6. 6 Internet Standards & Communication Era  Internet standards (XML / Web Services) are the future. These include:  Physical - Ethernet, TCP/IP  Human readable - HTML, JAVA, Active X  Machine readable - XML, SOAP, SNMP, SMTP,.NET, J2EE, SQL  Web pages for user interface  IT data standards for open communications between devices

7. 7 Why Use Open System HVAC Controls  End users are not locked into a proprietary control system  End users have a wide choice of controllers and devices from many manufacturers  End users drive the system requirements:  Integrate building control systems into a single interface  Simplify operation of complex building controls  Desire for easy access to complex control system data  Interpret control data for system optimization and cost savings  Access multi-building sites from the Internet

8. 8 Open HVAC Controls Standards  HVAC Industry Standards enable communication between various vendors products  Most specified  BACnet  LonMark  Other interoperable protocols highly used  ModBus  IEB  BACnet and LonTalk are great solutions - but neither was designed for the web and are not readily integrated with business systems

9. 9 Modularity to use best suitable wire Strong standard to avoid gateways FTT10 LONtalk LONmark Application Layer Transport Layer Physical Layer PSTN ISDN RS232RS485 Ethernet TCP/IP New communication technology

10. 10 Wireless Field Divises Field controllers Field Net oBIX Field level Automation level Management level Automation level network Field level network Management level network HTTP XML Danger management BacNet/ Lonworks/ModBus

11. 11 Intranet Enterprise Application Servers Network based controller Room Controller Room Controller LonTalk Controller LonTalk Controller Other XML based system Controller oBIX (Ethernet / TCP/IP/XML / HTTP) Network based controller BACnet LonTalk Controller LonTalk Other Protocols