BACnet

BACnet Solutions from FieldServer Technologies

• BACnet protocol drivers
  • BACnet IP
  • BACnet MS/TP
  • BACnet Ethernet
  • BACnet PTP
  • BACnet ARCnet
• BACnet Gateways
  • Serial-Ethernet Gateway
  • Multichannel Gateway
  • 10-port Gateway
• BACnet ControlLogix SlotServer Module for Allen Bradley PLCs
• BACnet ProtoCessor Protocol Modules for OEM Applications

Applications using FieldServer BACnet solutions :

• Interfacing Caterpillar generators to BACnet IP at the South Pole
• FieldServer as the key player enabling University of Arizona to link multiple networks to BACnet/IP backbone
• Linking EST3 Fire Alarm Control Panels to BACnet network

FieldServer Technologies BACnet Protocol Implementation Conformance (PIC) Statements

• FieldServer Technologies
• ProtoCessor

BACnet Protocol

BACnet is "a data communication protocol for building automation and control networks." A data communication protocol is a set of rules developed by the BACnet committee at ASHRAE governing the exchange of data over a computer network. The rules take the form of a written specification that spells out what is required to conform to the protocol.

There are 5 different options for BACnet, each of which fills a particular niche in terms of the price/performance tradeoff. The first is Ethernet, the fastest at 10 Mbps with 100 Mbps also recently available. ("Mbps" stands for "millions of bits per second.") Ethernet is also likely to be the most expensive in terms of cost per device.

There are two forms of BACnet for Ethernet. One is called BACnet Ethernet for dedicated BACnet lines and there is also a BACnet for TCP called BACnet IP which can run on a non-dedicated Ethernet line. Next comes BACnet ARCNET at 2.5 Mbps. Both Ethernet and ARCNET can use a variety of physical media ñ coaxial cable, twisted pairs, even fiber optic cable.

For devices with lower requirements in terms of speed, BACnet defines the BACnet MS/TP (master-slave/token-passing) network designed to run at speeds of 1 Mbps or less over twisted pair wiring (RS-485). All of these networks are examples of "local area networks" or LANs. BACnet also defines a dial-up or "point-to-point" protocol called BACnet PTP for use over phone lines or hardwired RS-232 connections. A key point is that BACnet messages can, in principle, be transported by any network technology, if and when it becomes cost-effective to do so and FieldServer Technologies has the drivers available for all forms of BACnet.