R ecently, a client with a good understanding of the owner/engineer perspective of the industry made some strong statements regarding the state of BAS interoperability:

• There is quite a bit of confusion regarding open protocols, and what is fact versus fiction.

• Some owners with legacy control systems feel that they?re being held hostage by control suppliers.

• Because of the myths concerning open protocols control suppliers can decide the equipment to which they will or won?t integrate.

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This sounds pretty damning if this is an accurate reflection of even a significant minority of our industry. What makes this even stranger is the fact that both BACnet ^TM and LonWorks ^TM are fairly mature technologies that have been ?official? for well over a decade. In fact, the industry has thoroughly embraced their use, largely making proprietary protocols obsolete. So, why do the myths and confusion continue?

As professionals that focus on Intelligent Buildings we?re comfortable with the self-learning needed to demystify any new protocol issues that come our way. Therefore, we are constantly bewildered when reviewing project requirements and/or specifications that seem to mix and match BACnet, LonWorks and/or Modbus specifics as if they were interchangeable (i.e. provide LonTalk communications over EIA-485 using BACnet objects?huh?).

Is it fair to blame the ?control suppliers?? Sorry to say but the clich? ?buyer beware? applies here as with any other purchase. On the other hand, are the control suppliers and manufacturers doing enough to help diffuse this problem? While this is doubtful, it also is not their responsibility to fully shoulder. So what is one to do?

[an error occurred while processing this directive] We see plenty of opportunities for the industry to educate itself sufficiently to overcome these myths. How about:

• For self-learners the BACnet standard has plenty of sections that are meant for specifiers (mainly the Annexes), and both the BACnet committee?s and BACnet International?s websites list educational resources. Likewise, the Echelon and LonMark websites list educational documents and resources.

• Many organizations (ASHRAE, AEE, etc.) offer courses on open protocols.

• Many BAS manufacturers list open protocol white papers on their website.

• Why not take a course on the BAS of your choice, especially one which covers installation and programming? Sure this usually is a multi-day commitment, but the knowledge gained will be well worth it (and you will see first-hand how protocols per-se have less to do with what?s needed to make a BAS work in an open environment than you would think).

• If a lot of the terminology and concepts provided by the above still seems like gibberish maybe a course on data communications would be a worthy investment.

• Of course planning on attending the Engineered Systems ?Sustainable Solutions Conference on High Performance Buildings? in June is also a great place to learn more!

The opportunities abound, so if an engineer can become an expert in Computational Fluid Dynamics why not in open protocols? We would argue that the challenge is more about priorities, interest, and investing the time needed rather than due to a lack of opportunities. Perhaps this means it is time for the industry to admit that the knowledge needed to properly specify interoperable BAS?s and intelligent building solutions is a specialty that needs to be viewed in the same vein as that for acoustics and/or for the design a building?s IT infrastructure.

About the Authors

Paul and Ira first worked together on a series of ASHRAE projects including the BACnet committee and Guideline 13 ? Specifying DDC Controls. The formation of Building Intelligence Group provided them the ability to work together professionally providing assistance to owners with the planning, design and development of Intelligent Building Systems. Building Intelligence Group provides services for clients worldwide including leading Universities, Corporations, and Developers. More information can be found at www.buildingintelligencegroup.com   We also invite you to contact us directly at Paul@buildingintelligencegroup.com or ira@buildingintelligencegroup.com

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