BACnet is a communications protocol for building automation and control networks. It is an ASHRAE, ANSI, and ISO standard protocol. BACnet was designed to allow communication of building automation and control systems for applications such as heating, ventilating, and air-conditioning control, lighting control, access control, and fire detection systems and their associated equipment. The BACnet protocol provides mechanisms for computerized building automation devices to exchange information, regardless of the particular building service they perform.

The BACnet protocol defines a number of services that are used to communicate between building devices. The BACnet protocol also 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, and Device...etc.

The BACnet is based on a four-layer collapsed architecture that corresponds to the physical, data link, network, and application layers of the OSI model. The application layer and a simple network layer are defined in the BACnet standard.

Feature:

  • Designed specifically for building automation control
  • Conformance to ANSI/ASHRAE Standard 135-2008 or ISO 16484-5
  • A completely non-proprietary open communication software standard
  • Support several different physical and link layers (BACnet/IP, Ethernet, ARCNET, MS/TP, PTP, and LonTalk)
  • All data in a BACnet system is represented in terms of "objects," "properties" and "services."
  • Scalability and choice of compatibility with other systems and vendors
 
Model Description
Gateway GW-5492
 
BACnet/IP Server to Modbus RTU Master Gateway
GW-5493
 
BACnet/IP Server to Modbus TCP Client Gateway
GW-2492M
 
BACnet/IP Server to Modbus RTU Master Gateway
GW-2493M
 
BACnet/IP Server to Modbus TCP Client Gateway
GW-2439M
 
Modbus TCP Server to BACnet/IP Client Gateway
I/O Modules BNET-5304
 
BACnet/IP I/O Module with 6-Ch AI, 1-Ch AO, 4-Ch DI, 4-Ch DO
BNET-5310
 
BACnet/IP I/O Module with 4-Ch AI, 2-Ch AO, 3-Ch DI, 3-Ch DO
 

BACnet is a communications protocol for building automation and control networks. It is an ASHRAE, ANSI, and ISO standard protocol. BACnet was designed to allow communication of building automation and control systems and provides mechanisms for computerized building automation devices to exchange information, regardless of the particular building service they perform.

The BACnet is based on a four-layer collapsed architecture that corresponds to the physical, data link, network, and application layers of the OSI model. The application layer and a simple network layer are defined in the BACnet standard.
MS/TP stands for Master Slave  Token Passing. Each device on the link is considered the “master” when it has the token. If it does not have immediate need to use the token, it is required to pass the token along to the next device.The physical layer uses RS485 which allows up to 128 devices to be installed on a single network.
BACnet MS/TP Gateway
Model Description
GW-2139M
 
Modbus TCP Server to BACnet MS/TP Master Gateway