Building Automation & Control Networks | Standards Michigan

Building Automation & Control Networks

The emergent #SmartCampus depends heavily on swiftly evolving electrotechnologies. ASHRAE SSPC 135 has been set up to keep pace with these developments.


Building Automation & Control Networks

August 5, 2019
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“Universal Exhibition at the Crystal Palace in London” | Thomas Abel Prior (1851)

The American Society of Heating and Refrigeration Engineers (ASHRAE) has released three more candidate revisions to ASHRAE 135 Building Automation & Control Networks a standard that advances the #SmartCampus transformation in two important ways:

  • It defines data communication services and protocols for computer equipment used for monitoring and control of HVAC&R and other building systems
  • It defines an abstract, object-oriented representation of information communicated between such equipment, thereby facilitating the application and use of digital control technology in buildings.

Since the late 1970’s these systems have grown from single building control networks for environment air for a single building into multi-building, multi-vendor campus-wide systems that manage 100’s of thousands of control points that include control of access doors, elevators and exterior lighting.  They lie at the foundation of the emergent #SmartCampus which the leadership of the education industry likes to talk about but does nothing about except attend conferences.

In our view, the development of ASHRAE 135 is about as good as it gets for the USER-INTEREST to participate in consensus product development.

Each of these addenda offers insight into near-real-time evolution of campus building automation systems code that lies at the foundation of the emergent #SmartCampus

Addendum bj: The BACnet protocol stack as outlined in Clause 4 of the standard was defined before 1995, when the TCP/IP protocol suite was expensive and not available for smaller devices common in building automation. With today’s availability of IP network infrastructures for building automation that may be shared with other applications, and may be professionally managed by an IT department, there is a need for a more IT-friendly BACnet solutions that allows communicating BACnet across such infrastructures. This introduction first outlines current issues with BACnet in such environments and provides an overview of the solution proposed in this addendum.

Addendum by: Administrative changes that correlate with Addendum bj regarding BACNet security.

Addendum bz: Add Who-Am-I and You-Are Services

Comments are due August 5th.

You may comment directly on ASHRAE’s public commenting facilities, linked below:

ASHRAE Public Review Drafts Standards

We are happy to walk through the technical specifics of these addenda any day at 11 AM Eastern time.  Additionally, we follow standards action in all codes and standards that govern planning, design, construction. operation and maintenance of mechanical systems within buildings and between buildings and provide an overview every month.  See our CALENDAR for the next online meeting; open to everyone.

Issue: [17-230]

Category: #SmartCampus, Electrical, Telecommunications, Mechanical, Energy, Facility Asset Management

Colleagues: David Conrad, Larry Spielvogel, Richard Robben





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