Image Processing Reference
In-Depth Information
Sensor/
actuator
Input/output
Memory
Neuron chip
or alternative
implementations
Power/reset
Transceiver
CNP segment
FIGURE .
LonWorks node.
(binding). At runtime, the linked variables are held consistent by the nodes' system sotware. his is
transparent to the application.
No particular compulsory semantics are assigned to network variables. In addition, free-form mes-
sages may be exchanged instead. his allows entirely nonopen systems based on LonWorks/LonTalk
to be realized, and certain manufacturers do avail themselves of this possibility.
The LonMark Organization [] defines interoperability guidelines for LonTalk-based devices.
These include SNVT and function blocks. A great variety of such blocks has been defined. These
include generic control loop elements, management functions (
Data Logger
or
Scheduler
)aswellas
application domain specific functions, in particular from the HVAC and lighting/shading field (e.g.,
VAV Controller
and
Constant Light Controller
). Using these profiles is not compulsory. hey are not
included in any formal standard.
29.5.4 KNX
KNX [] can be regarded as an extension to EIB, which is widespread in Europe, in particular in
German speaking countries. he KNX protocol is included in the EN series of standards [].
Its medium-independent layers were also published within the ISO/IEC series of standards [].
EIB was designed to enhance electrical installations in homes and buildings of all sizes by sepa-
rating the transmission of control information from the traditional main wiring. In , EIB was
merged with Batibus and EHS (European Home System) to form KNX. The target of this merger
was to create a single European
Home and Building Electronic System (HBES)
standard. Still, the EIB
