 BACnet is a Data Communications Protocol for Building Automation and Control Networks. It is an ASHRAE, ANSI, and ISO standard protocol. Image File history File links BACnet Logo File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ...
In the field of telecommunications, a communications protocol is the set of standard rules for data representation, signalling, authentication, and error detection required to send information over a communications channel. ...
The American Society of Heating, Refrigerating and Air Conditioning Engineers (ASHRAE) is an international voluntary organization for people involved in heating, ventilation, air conditioning, or refrigeration (HVAC&R). ...
The American National Standards Institute (ANSI) is a private, non-profit standards organization that produces industrial standards in the United States. ...
ISO has many meanings: Iso is the stem of the Latin transliteration of the Greek word ίσος (Ãsos, meaning equal). The iso- prefix in English derives from this and means equality or similarity. ...
Definition
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 American Society of Heating, Refrigerating and Air Conditioning Engineers (ASHRAE) is an international voluntary organization for people involved in heating, ventilation, air conditioning, or refrigeration (HVAC&R). ...
History of BACnet The development of the BACnet protocol began in June, 1987, in Nashville, Tennessee, at the inaugural meeting of the Standing Project Committee (SPC). H. Michael Newman, the first chairman of the committee, presided over the meeting. The first meeting produced a list of desirable attributes of a good protocol, and what the BACnet protocol eventual became: Interoperability, Efficiency, Low Overhead, Highest Common Multiplier, Compatibility with other applications and networks, Layered OSI model Network, Flexibility, Extensibility, Cost Effective, Transmission Relibility, Apply to real-time processes, Maximum Simplicity, Allow priority schemes, Medium access fairness, and Stability under realistic loads. The Open Systems Interconnection Reference Model (OSI Model or OSI Reference Model for short) is a layered abstract description for communications and computer network protocol design, developed as part of the Open Systems Interconnection initiative. ...
The committee worked at reaching consensus using working groups to divide up the task of creating a standard. The working groups focused on specific areas and provide information and recommendations to the main committee. The first three working groups were the Data Type and Attribute Working Group, Primitive Data Format Working Group, and the Application Services Working Group.
BACnet became an ASHRAE/ANSI standard in 1995, and an ISO standard in 2003. BACnet is under continuous maintenance by the ASHRAE Standing Standard Project Committee 135. The American Society of Heating, Refrigerating and Air Conditioning Engineers (ASHRAE) is an international voluntary organization for people involved in heating, ventilation, air conditioning, or refrigeration (HVAC&R). ...
The American National Standards Institute (ANSI) is a private, non-profit standards organization that produces industrial standards in the United States. ...
ISO has many meanings: Iso is the stem of the Latin transliteration of the Greek word ίσος (Ãsos, meaning equal). The iso- prefix in English derives from this and means equality or similarity. ...
The American Society of Heating, Refrigerating and Air Conditioning Engineers (ASHRAE) is an international voluntary organization for people involved in heating, ventilation, air conditioning, or refrigeration (HVAC&R). ...
The BACnet protocol defines a number of services that are used to communicate between building devices. The protocol services include Who-Is, I-Am, Who-Has, I-Have, which are used for Device and Object discovery. Services such as Read-Property and Write-Property are used for data sharing.
The BACnet protocol defines a number of Objects that are acted upon by the services. The objects include Analog Input, Analog Output, Analog Value, Binary Input, Binary Output, Binary Value, Multi-State Input, Multi-State Output, Calendar, Event-Enrollment, File, Notification-Class, Group, Loop, Program, Schedule, Command, and Device.
The BACnet protocol defines a number of data link / physical layers, including ARCNET, Ethernet, BACnet/IP, Point-To-Point over RS-232, Master-Slave/Token-Passing over RS-485, and LonTalk. ARCNET (also CamelCased as ARCnet, an acronym from Attached Resource Computer NETwork) is a local area network (LAN) protocol, similar in purpose to Ethernet or Token Ring. ...
Ethernet is a frame-based computer networking technology for local area networks (LANs). ...
RS-232 (also referred to as EIA RS-232C or V.24) is a standard for serial binary data interchange between a DTE (Data terminal equipment) and a DCE (Data communication equipment). ...
EIA-485 (formerly RS-485 or RS485) is an electrical specification of a two-wire, half-duplex, multipoint serial connection. ...
See also - LonWorks -- A competing protocol and transport medium for BACnet
- KNX_(standard) -- A competing protocol (knx/eib) - Home & Building Automation standard.
- Digital Integration -- Interface methods for connecting different protcols within buildings
LonWorks is a networking platform specifically created to address the unique performance, reliability, installation, and maintenance needs of control applications. ...
EIB changed its name to KNX. More precisely it was a convergence between the standards EHSA, BATIBUS and EIB. The new standard is now called KNX. European Installation Bus (EIB), now changed to KNX, is the worlds leading system for intelligent electrical installation networking. ...
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