RFXCOM RFXtrx433 Especificaciones descargar pdf (Pagina 62)

Chapter 4. Implementation 55

HE 1 IT 1

HE 1

HE 2

IT 1

HE 1

HE 2

IT 1

IT 2

IT 3

receiver sender receiver sender senderreceiver

network 1 network 2 network 3

Figure 4.16.: Three diﬀerent HA networks with connections between IT and HE devices.

one of the diﬃculties of protocol translation: The on/oﬀ-code of the default transmitter can

change further receivers and trigger other protocol translations. When network 3 receives a

message from “IT 1”, there are two protocol translations and transmitter “HE 3” and “IT 3”

are triggered. To allow inﬁnite connection chains, the database is searched recursively for further

connections. The search is aborted if no more connections are found or inﬁnite loops occur. For

example, network 3 will loop if transmitter “IT 1” and “IT 3” are the same. All in all, the protocol

translation oﬀers an easy connection method between devices of diﬀerent HA systems, because

they can be connected by simply assigning them as connected in the database. However, this type

of connecting has its drawbacks: A protocol translation will always cause at least one additional

message to be sent. In case of larger connections, a high number of messages are sent, which can

block the transmission channel for a certain amount of time. Therefore, the HA system should be

designed in a way that avoids high numbers of connections for single devices.

4.5. Visualization

The visualization node is the last member of the abstraction chain shown in ﬁgure 3.4 on page 31.

It has a graphical user interface (GUI) for graphical control over the HA system and oﬀers various

visualisation functions as well as a namespace service. It is composed of three main components:

Scene menu: The scene menu is a class for generating scenes, which are graphical representations

of namespaces. They consist of a name, an image and a number of devices, which are part

of the namespace and they usually describe locations, such as rooms or places. As a result,

devices can be separated in groups and controlled by their location. This is useful for larger

networks, as information becomes more readable and devices from unwanted locations can

be ﬁltered.

Visualization menu: The visualization menu is a class for displaying the database of the device

manager node to give a quick overview of the connections between devices and their state.

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RFXCOM RFXtrx433 Especificaciones Pagina 62