Distribuerade fastighetsautomationssystem
- En implementation av kommunikationsprotokollet BACnet
Building Automation Systems in commercial buildings are often designed and installed by different contractors, using equipment and components from different manufacturers. The lack of an accepted communication standard has resulted in a few different standards. Many manufacturers of building automation systems only support one, a few or none of these standards, while developing proprietary system solutions. Regin, who develop such equipment, are planning to adopt an open communication protocol specially designed for building automation - BACnet. As a step in that direction this thesis was announced with the purpose to investigate the possibility to implement BACnet in one of their products and to gain more knowledge of the BACnet protocol. Literature covering computer communication and distributed systems has been reviewed and relevant requirements that apply to building automation systems have been identified. The BACnet standard has proven to support many of the requirements on such systems. However, there are some limitations that need to be considered if BACnet is implemented in safety critical systems, e.g. redundant communication infrastructure between two BACnet nodes is not allowed. The BACnet communication protocol (with limited functionality) has been implemented and tested in a Regio zone controller. Some of the original Regio features had to be compromised to fit the code in memory. However, by optimizing the code and using another compiler there is a good possibility that a fully functional "BACnetified" Regio can be developed as an extension of this project.