Echelon and Siebe Host ''Open Systems'99'';
Twenty-Two Leading Manufacturers Co-Sponsor Seminar Series
Featuring Open, Interoperable LONWORKS Solutions

PALO ALTO, Calif. --(BUSINESS WIRE)-- July 8, 1999 -

Echelon Corporation (Nasdaq:ELON), the leading provider of LONWORKS(R) control network solutions worldwide and Siebe Environmental Controls, a leading provider of LONWORKS solutions for building automation worldwide, announced that they have joined forces with major building controls companies for Open Systems'99, a series of seminars and expositions being held in 39 North American cities. Open Systems'99, targeted at building managers, consulting engineers, and architects, will highlight how the LONWORKS system is used in the building controls industry to lower life-cycle and operation costs and to build more valuable buildings. The series will show industry decision makers in the market how to specify, buy, and build open, multi-vendor building control systems using interoperable LONMARK(R) products and how to use the Internet and the LNS(TM) network operating system to remotely monitor and maintain these systems. The first seminar will be held in Ontario, Calif. on August 3, 1999.

In addition to Echelon and Siebe, Open Systems'99 is sponsored at the national level by industry leaders CIRCON Technology Corporation, Control Systems International (CSI), Douglas Lighting, GE Total Lighting, Hubbell, Honeywell International, Raytheon Corporation, Accutherm, Alya International, C&K Systems, Checkpoint Security Systems Group, Daymetrix, Electronic Systems USA, Engenuity Systems, Johnson Controls, Leviton Manufacturing, the National Joint Apprenticeship and Training Committee (NJATC) of the National Electrical Contractors Association and the International Brotherhood of Electrical Workers, Siemens Building Technologies, Sloan Valve, and TA Engineering. At the local level, it is sponsored by member companies of Echelon's Authorized Network Integrator program and the local Siebe Environmental Controls field offices. Echelon's Authorized Network Integrator channel and the local Siebe Environmental Controls field offices offer networking and integration expertise to commercial, industrial, municipal, governmental, and institutional facility owners who want the cost, reliability, and flexibility benefits offered by open, nonproprietary LONWORKS control systems.

"For many years IT managers have benefited from a thriving, open market for data networking systems," said Ken Lavezzo, Vice President and General Manager of the LonPoint Systems Division. "Open LONWORKS control networks are now bringing these same cost, flexibility, and choice benefits to building owners and facility managers. Coupled with Internet connectivity, LONWORKS networks can provide information to the enterprise that helps it run more efficiently at lower cost."

"Siebe Environmental is at the forefront of open systems technology based on Echelon's LONWORKS platform and the LONMARK guidelines," said Brent Bernardi, Vice President of Sales and Marketing for Siebe. "Through our partnership with Echelon, we have incorporated the industry-leading LONWORKS technology into our I/A Series(R) family and have complemented our total building solutions with the LonPoint(TM) System offering. This tour represents a tremendous opportunity to establish Siebe as a local as well as global leader in the interoperable, open systems movement. Through our local, national and global marketing and distribution efforts, we look forward to the products and tools reaching building managers, consulting engineers, and architects to help them specify and implement the technology into truly open interoperable LONWORKS solutions based on LONMARK guidelines."

Tour events will comprise a half-day educational seminar, presentations, and live demonstrations of LONWORKS based building products. Attendees can review LONWORKS products and discuss open system solutions with tour sponsor representatives at the event.

Web Links:

• Echelon Corporation http://www.echelon.com
• Accutherm http://www.accutherm.com
• Alya International http://www.alya.com
• C & K Systems http://www.cksys.com
• Checkpoint Security Systems Group http://www.checkpointsystems.com
• CIRCON Technology Corporation http://www.circon.com
• Control Systems International (CSI) http://www.control-systems.com
• Daymetrix http://www.daymetrix.com
• Electronic Systems USA http://www.esusa.com
• Engenuity Systems http://www.engenuity.com
• Honeywell International http://www.honeywell.com
• Hubbell http://www.hubbell.com
• Johnson Controls http://www.johnsoncontrols.com
• Leviton Manufacturing http://www.leviton.com
• LNS network operating system http://www.echelon.com/lns
• The LONMARK Interoperability Association http://www.lonmark.org
• The LonPoint System and Authorized Network Integrators http://ni.echelon.com
• NJATC http://www.njatc.org
• Raytheon Corporation http://www.raytheon.com
• Siebe Environmental Controls http://www.siebe-env-controls.com
• Sloan Valve http://www.sloanvalve.com
• Staefa Control System, Siemens Building Technologies http://www.sibt.com
• TA Engineering http://www.ta-eng.com

About Echelon Corporation
Echelon Corporation is the developer of LONWORKS networks, recognized internationally as a standard for interoperable control networks. With thousands of application developers and millions of devices installed worldwide, the LONWORKS system is a leading open, networked control solution for building and home automation, industrial, transportation, and public utility applications. Echelon offers a full range of off-the-shelf hardware and software products to support the development, installation and management of intelligent, open and interoperable control networks. Echelon is based in Palo Alto, Calif. with international offices in China, France, Germany, Japan, Korea, The Netherlands and the United Kingdom. News and information are available at http://www.echelon.com.

About Siebe Environmental Controls
Siebe Environmental Controls offers a full line of effective solutions to manage and control building mechanical systems, energy usage, and operating efficiencies through a worldwide network of field offices. As one of the world's largest manufacturers of interoperable building control products, Siebe Environmental Controls provides comprehensive programs and easy-to-use systems to optimize commercial building operation. Siebe Environmental Controls extensive line of valves, actuators, and sensors complete the building automation systems, offering a single source for all building control needs.

About the LONMARK Interoperability Association
Since its inception in May 1994, the LONMARK Interoperability Association has become a major driving force in the establishment of interoperable standards for building, industrial and residential/utility automation. LONMARK membership is open to any manufacturer, end user, or system integrator committed to the development and use of open, interoperable products using multivendor LONWORKS control networks. Products that have been verified to conform to the LONMARK Interoperability Guidelines are eligible to carry the LONMARK logo. Further information on the LONMARK Interoperability Association and its members can be found on the LONMARK Association website at http://www.lonmark.org.