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Enriching Building Automation Systems (BAS) with new services formerly provided by separate subsystems promises synergies, but increases demands on the BAS architecture. In particular, the integration of security subsystems significantly tightens security requirements on the protocol of a networked control system. First, this paper gives a survey on(More)
Building automation systems are traditionally concerned with the control of heating, ventilation, and air conditioning, as well as lighting and shading, systems. They have their origin in a time where security has been considered as a side issue at best. Nowadays, with the rising desire to integrate securitycritical services that were formerly provided by(More)
Building Automation Systems (BAS) lack a common application model. Thus, the development of control applications (CAs) is not a very straightforward task and requires profound expertise. When in addition security has to be considered, inexperienced developers are overwhelmed by the manifold demands and constraints. This paper presents an approach to ease(More)
The challenge of integrating heterogeneous systems in order to combine their functionality is of utmost importance for the further deployment of building automation systems. The goal is to allow comprehensive communication among the systems. This will provide enhanced possibilities thus making way for intelligent buildings. Traditionally, integration is(More)
The use of IP networks as common backbone is becoming of increased interest in today's building automation systems (BAS). With the use of IP also new attack scenarios that threaten the overall security of BAS are introduced. Due to the absence of native security mechanisms in IP and because of its long standing and pervasive use in the IT world, many(More)
The deployment of building automation systems (BAS) allows to increase comfort, safety and security and to reduce operational cost. Today such systems typically follow a two-layered hierarchical approach. While control networks interconnect distributed sensors, actuators and controllers, a backbone provides the necessary infrastructure for management tasks(More)
Improved technology and economically feasible costs allow a widespread deployment of embedded systems in various application domains - ranging from integration into cars, industrial automation up to building automation. A sophisticated security architecture considering the challenging constraints on these systems and providing secure communication, secure(More)
Many applications such as distributed measurements or real-time networks benefit from a common notion of time. Protocols providing high precision and simple clock synchronization are necessary to achieve such a common time base. However, most of the available protocols are lacking with regard to fault tolerance and performance in case of a fault. The(More)
With today’s ongoing integration of heterogeneous building automation systems, increased comfort, energy efficiency, improved building management, sustainability as well as advanced applications such as active & assisted living scenarios become possible. Obviously, the demands – especially regarding security – increase: Secure communication becomes equally(More)