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Full Description

BACnet, the ASHRAE building automation and control networking protocol, has been designed specifically to meet the communication needs of building automation and control systems for applications such as heating, ventilating, and air-conditioning control, lighting control, access control, and fire detection systems. The BACnet protocol provides mechanisms by which computerized equipment of arbitrary function may exchange information, regardless of the particular building service it performs. As a result, the BACnet protocol may be used by head-end computers, general-purpose direct digital controllers, and application specific or unitary controllers with equal effect.

The motivation for this standard was the widespread desire of building owners and operators for "interoperability," the ability to integrate equipment from different vendors into a coherent automation and control system - and to do so competitively. The purpose of this standard is to define data communication services and protocols for computer equipment used for monitoring and control of HVAC&R and other building systems and to define an abstract, object-oriented representation of information communicated between such equipment, thereby facilitating the application and use of digital control technology in buildings. This protocol provides a comprehensive set of messages for conveying encoded binary, analog, and alphanumeric data between devices including, but not limited to:

(a) hardware binary input and output values,
(b) hardware analog input and output values,
(c) software binary and analog values,
(d) text string values,
(e) schedule information,
(f) alarm and event information,
(g) files, and
(h) control logic.

Keywords: BACnet, building automation, building automation system, BAS, building control network, building automation network

 

Document History

  1. ASHRAE 135-2016


    Standard 135-2016 -- BACnet-A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved)

    • Most Recent
  2. ASHRAE 135-2012


    Standard 135-2012-- BACnet-A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved)

    • Historical Version
  3. ASHRAE 135-2010

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    Standard 135-2010 -- BACnet -- A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved)

    • Historical Version
  4. ASHRAE 135-2008


    Standard 135-2008 -- BACnet - A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved)

    • Historical Version
  5. ASHRAE 135-2004


    Standard 135-2004 -- BACnet -- A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved)

    • Historical Version
  6. ASHRAE 135-2001


    Standard 135-2001 -- BACnet-A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved)

    • Historical Version
  7. ASHRAE 135-1995


    Standard 135-1995 -- BACnet - A Data Communication Protocol for Building Automation and Control Networks [CONTINUOUS MAINTENANCE STANDARD]

    • Historical Version
 

Amendments, rulings, supplements, and errata

  1. ASHRAE IC 135-2010-14

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    Interpretation IC 135-2010-14 of Standard 135-2010 -- BACnet A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved)

  2. ASHRAE 135-2010 Errata

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    Errata to Standard 135-2010 -- BACnet A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved)

  3. ASHRAE IC 135-2010-13

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    Interpretation IC 135-2010-13 of Standard 135-2010 -- BACnet A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved)

  4. ASHRAE IC 135-2010-12

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    Interpretation IC 135-2010-12 of Standard 135-2010 -- BACnet A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved)

  5. ASHRAE 135-2010 Addendum i

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    Addendum i to ASHRAE 135-2010 BACnet - A Data Communication Protocol for Building Automation and Control Networks

  6. ASHRAE 135-2010 Addendum ao

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    Addendum ao to ASHRAE 135-2010 BACnet - A Data Communication Protocol for Building Automation and Control Networks

  7. ASHRAE 135-2010 Addendum ak

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    Addendum ak to ASHRAE 135-2010 BACnet - A Data Communication Protocol for Building Automation and Control Networks

  8. ASHRAE 135-2010 Addendum aa

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    Addendum aa to ASHRAE 135-2010 BACnet - A Data Communication Protocol for Building Automation and Control Networks

  9. ASHRAE IC 135-2010-11

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    Interpretation IC 135-2010-11 of Standard 135-2010 -- BACnet A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved)

  10. ASHRAE IC 135-2010-10

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    Interpretation IC 135-2010-10 of Standard 135-2010 -- BACnet A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved)

  11. ASHRAE IC 135-2010-9

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    Interpretation IC 135-2010-9 of Standard 135-2010 -- BACnet A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved)

  12. ASHRAE IC 135-2010-8

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    Interpretation IC 135-2010-8 of Standard 135-2010 -- BACnet A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved)

  13. ASHRAE IC 135-2010-7

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    Interpretation IC 135-2010-7 of Standard 135-2010 -- BACnet A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved)

  14. ASHRAE IC 135-2010-6

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    Interpretation IC 135-2010-6 of Standard 135-2010 -- BACnet A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved)

  15. ASHRAE IC 135-2010-5

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    Interpretation IC 135-2010-5 of Standard 135-2010 -- BACneta - A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved)

  16. ASHRAE IC 135-2010-4

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    Interpretation IC 135-2010-4 of Standard 135-2010 -- BACneta - A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved)

  17. ASHRAE 135-2010 Addendum af

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    Addendum af to ASHRAE 135-2008 BACnet - A Data Communication Protocol for Building Automation and Control Networks

  18. ASHRAE IC 135-2010-3

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    Interpretation IC 135-2010-3 of Standard 135-2010 -- BACnet A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved)

  19. ASHRAE IC 135-2010-2

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    Interpretation IC 135-2010-2 of Standard 135-2010 -- BACnet A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved)

  20. ASHRAE 135-2010 Addendum ae

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    Addendum ae to Standard 135-2010 -- BACnet A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved)

  21. ASHRAE 135-2010 Addendum ad

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    Addendum ad to Standard 135-2010 -- BACnet A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved)

  22. ASHRAE IC 135-2010-1

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    Interpretation IC 135-2010-1 of Standard 135-2010 -- BACnet A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved)