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Full Description

Meet Building Automation and ControlSystems Communication Needs with Standard 135-2020
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BACnet, the ASHRAE buildingautomation and control networking protocol, has been designed specifically tomeet the communication needs of building automation and control systems forapplications such as heating, ventilating, and air-conditioning control; fireand other life safety and security systems; energy management; lightingcontrol; physical access control; and elevator monitoring systems. The BACnetprotocol provides mechanisms by which computerized equipment of arbitraryfunction may exchange information, regardless of the particular buildingservice it performs. As a result, the BACnet protocol may be used by mobile andcloud-hosted devices, head-end computers, general-purpose direct digitalcontrollers, and application-specific or unitary controllers with equal effect.

This protocol provides acomprehensive set of messages for conveying encoded building automation databetween devices:
* Hardware binary input and output values
* Hardware analog input and output values
* Software data values
* Schedule information
* Alarm and event information
* Trend and event logs
* Files
* Control logic
* Application specific data for a large range of building services
* Network configuration including security

The 2020 edition of Standard 135 includesmany new capabilities and several clarifications. New capabilities include lightingand elevator device profiles that provide a standardized description for thesetypes of devices, along with audit reporting and logging to capture auditableactions. BACnet Secure Connect, a BACnet datalink layer, was also added. Thisdatalink is fully compatible with all existing BACnet datalinks and provides aninteroperable secure path for BACnet communications.

 

Document History

  1. ASHRAE 135-2020

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    Standard 135-2020 -- BACnet -- A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved)

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  2. ASHRAE 135-2016


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

    • Historical Version
  3. ASHRAE 135-2012


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

    • Historical Version
  4. ASHRAE 135-2010


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

    • Historical Version
  5. ASHRAE 135-2008


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

    • Historical Version
  6. ASHRAE 135-2004


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

    • Historical Version
  7. ASHRAE 135-2001


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

    • Historical Version
  8. 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 135-2020-9

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    Interpretation IC 135-2020-9 to Standard 135-2020 -- BACnet -- A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved)

  2. ASHRAE IC 135-2020-8

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    Interpretation IC 135-2020-8 to Standard 135-2020 -- BACnet -- A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved)

  3. ASHRAE IC 135-2020-7

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    Interpretation IC 135-2020-7 to Standard 135-2020 -- BACnet -- A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved)

  4. ASHRAE IC 135-2020-6

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    Interpretation IC 135-2020-6 to Standard 135-2020 -- BACnet -- A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved)

  5. ASHRAE 135-2020 Addendum cd

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    Addendum cd to Standard 135-2020 -- BACnet -- A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved)

  6. ASHRAE 135-2020 Errata Summary

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    Errata Summary to Standard 135-2020 -- BACnet -- A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved)

  7. ASHRAE IC 135-2020-5

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    Interpretation IC 135-2020-5 to Standard 135-2020 -- BACnet -- A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved)

  8. ASHRAE IC 135-2020-4

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    Interpretation IC 135-2020-4 to Standard 135-2020 -- BACnet -- A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved)

  9. ASHRAE IC 135-2020-3

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    Interpretation IC 135-2020-3 to Standard 135-2020 -- BACnet -- A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved)

  10. ASHRAE IC 135-2020-2

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    Interpretation IC 135-2020-2 to Standard 135-2020 -- BACnet -- A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved)

  11. ASHRAE IC 135-2020-1

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    Interpretation IC 135-2020-1 to Standard 135-2020 -- BACnet -- A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved)

  12. ASHRAE 135-2020 Errata (March 26, 2021)

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    Errata to Standard 135-2020 -- BACnet -- A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved)