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About This Item
Full Description
Meet Building Automation and Control Systems Communication Needs with Standard 135-2012
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.
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.
The purpose of Standard 135 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, in addition, an abstract, object-oriented representation of information communicated between such equipment, thereby facilitating the application and use of digital control technology in buildings.
This 2012 publication of the standard was motivated by the wide-reaching changes in alarming functionality made by Addendum af to Standard 135-2010. This edition of the standard also includes the recently adopted changes for the lighting industry.
Keywords: BACnet, building automation, building automation system, BAS, building control network, building automation network
Document History
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ASHRAE 135-2020
Standard 135-2020 -- BACnet—A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved)- Most Recent
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ASHRAE 135-2016
Standard 135-2016 -- BACnet-A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved)- Historical Version
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ASHRAE 135-2012
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Standard 135-2012-- BACnet-A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved)- Historical Version
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ASHRAE 135-2010
Standard 135-2010 -- BACnet -- A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved)- Historical Version
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ASHRAE 135-2008
Standard 135-2008 -- BACnet - A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved)- Historical Version
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ASHRAE 135-2004
Standard 135-2004 -- BACnet -- A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved)- Historical Version
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ASHRAE 135-2001
Standard 135-2001 -- BACnet-A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved)- Historical Version
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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
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ASHRAE IC 135-2012-20
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Interpretation IC 135-2012-20 of Standard 135-2012 -- BACnet A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved) -
ASHRAE 135-2012 Addendum bc
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Addendum bc to Standard 135-2012 -- BACnet A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved) -
ASHRAE 135-2012 Addendum ba
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Addendum ba to Standard 135-2012 -- BACnet A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved) -
ASHRAE 135-2012 Addendum am
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Addendum am to Standard 135-2012 -- BACnet A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved) -
ASHRAE 135-2012 Addendum bh
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Addendum bh to Standard 135-2012 -- BACnet A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved) -
ASHRAE 135-2012 Addendum bg
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Addendum bg to Standard 135-2012 -- BACnet A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved) -
ASHRAE 135-2012 Addendum bf
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Addendum bf to Standard 135-2012 -- BACnet A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved) -
ASHRAE 135-2012 Addendum aq
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Addendum aq to Standard 135-2012 -- BACnet A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved) -
ASHRAE 135-2012 Addendum aj
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Addendum aj to Standard 135-2012 -- BACnet A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved) -
ASHRAE IC 135-2012-19
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Interpretation IC 135-2012-19 of Standard 135-2012 -- BACnet A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved) -
ASHRAE IC 135-2012-18
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Interpretation IC 135-2012-18 of Standard 135-2012 -- BACnet A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved) -
ASHRAE 135-2012 Errata
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Errata Summary to Standard 135-2012 -- BACnet A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved) -
ASHRAE IC 135-2012-17
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Interpretation IC 135-2012-17 of Standard 135-2012 -- BACnet A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved) -
ASHRAE IC 135-2012-16
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Interpretation IC 135-2012-16 of Standard 135-2012 -- BACnet A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved) -
ASHRAE IC 135-2012-15
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Interpretation IC 135-2012-15 of Standard 135-2012 -- BACnet A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved) -
ASHRAE IC 135-2012-14
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Interpretation IC 135-2012-14 of Standard 135-2012 -- BACnet A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved) -
ASHRAE IC 135-2012-13
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Interpretation IC 135-2012-13 of Standard 135-2012 -- BACnet A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved) -
ASHRAE 135-2012 Addendum ay
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Addendum ay to Standard 135-2012 -- BACnet A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved) -
ASHRAE 135-2012 Addendum as
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Addendum as to Standard 135-2012 -- BACnet A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved) -
ASHRAE 135-2012 Addenda an, at, au, av, aw, ax, and az
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Addenda an, at, au, av, aw, ax, and az to Standard 135-2012 -- BACnet A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved) -
ASHRAE 135-2012 Addendum al
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Addendum al to Standard 135-2012 -- BACnet A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved) -
ASHRAE 135-2012 Addendum ai
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Addendum ai to Standard 135-2012 -- BACnet A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved) -
ASHRAE IC 135-2012-12
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Interpretation IC 135-2012-12 of Standard 135-2012 -- BACnet A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved) -
ASHRAE IC 135-2012-11
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Interpretation IC 135-2012-11 of Standard 135-2012 -- BACnet A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved) -
ASHRAE IC 135-2012-10
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Interpretation IC 135-2012-10 of Standard 135-2012 -- BACnet A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved) -
ASHRAE IC 135-2012-9
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Interpretation IC 135-2012-9 of Standard 135-2012 -- BACnet A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved) -
ASHRAE IC 135-2012-8
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Interpretation IC 135-2012-8 of Standard 135-2012 -- BACnet A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved) -
ASHRAE IC 135-2012-7
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Interpretation IC 135-2012-7 of Standard 135-2012 -- BACnet A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved) -
ASHRAE IC 135-2012-6
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Interpretation IC 135-2012-6 of Standard 135-2012 -- BACnet A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved) -
ASHRAE IC 135-2012-5
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Interpretation IC 135-2012-5 of Standard 135-2012 -- BACnet A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved) -
ASHRAE IC 135-2012-4
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Interpretation IC 135-2012-4 of Standard 135-2012 -- BACnet A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved) -
ASHRAE IC 135-2012-3
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Interpretation IC 135-2012-3 of Standard 135-2012 -- BACnet A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved) -
ASHRAE IC 135-2012-2
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Interpretation IC 135-2012-2 of Standard 135-2012 -- BACnet A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved) -
ASHRAE 135-2012 Addendum ar
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Addendum ar to Standard 135-2012 -- BACnet A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved) -
ASHRAE IC 135-2012-1
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Interpretation IC 135-2012-1 of Standard 135-2012 -- BACnet A Data Communication Protocol for Building Automation and Control Networks (ANSI Approved)