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Chapter 2. Related Work/Fundamentals 10

ing machines, involving more complex controls. Other HA systems usually can only switch these

devices on or oﬀ. There are four types of KNX networks [12]:

• Two-wire line: TP-0 with 4800 kbit/s and TP-1 at 9600 kbit/s

• Power-Line Communication: with 1200 bit/s or 2400 kbit/s

• Radio (KNX RF): 868 MHz, FSK, 16 kbit/s, routing up to three participants

• Ethernet: KNXnet / IP

As already mentioned before, these diﬀerent networks are often selected individually for each

application and can be combined via specialised gateways. This makes KNX a very robust system

and applicable for many tasks.

EnOcean

EnOcean describes an energy-harvesting wireless protocol, used primarily in building automation

systems. It harvests energy from motion, sunlight and temperature diﬀerences. Modules based on

EnOcean technology consist of an energy converter and ultra low power electronics. Since energy

harvesting modules yield only a very small amount of energy, typically around 50 µJ [13], devices

are constructed to consume as little power as possible. As a result, sensors often have only basic

functionality.

Figure 2.3.: three diﬀerent energy harvesting modules for energy conversion: ECO200 is used

for motion (switches or make contacts), ECT310 uses temperature diﬀerences (for

sensors on windows or heating pipes) ECS310 uses light (suitable for all kind of

devices). Image source: http://www.enocean.com/en/energy-harvesting/

EnOcean technology is marketed by EnOcean GmbH, whereas the automation hardware is sold by

members of the EnOcean Alliance, which currently consists of over 100 companies

. Though the

emphasis is on HVAC products, there are many products available for typical HA applications. As

EnOcean devices are relatively highly priced, they are not as common in HA as other systems.

http://www.enocean-alliance.org/en/our_members/

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RFXCOM RFXtrx433 Especificaciones Pagina 17