Bedienungsanleitung HomeMatic IP system (Seite 128 von 135) (Englisch)

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13.10 HomematicIP radio protocol and receive modes

Security

Your privacy is already protected in a ﬁrst step: For setting up the system, no personal data has

to be queried or recorded, except the technically required IP address. Moreover, all data saved in

the HomematicIP Cloud are provided on servers in Germany and are thus subject to the German

and European data protection guidelines. HomematicIP is the only smart home system whose

protocol, IT and data security has been certiﬁed by VDE.

In addition to the security of your data, the transmission security also ranks ﬁrst. The commu-

nication of HomematicIP is secure and cannot be manipulated. Any reading or changing of

data or other kinds of attack are impossible. Approved procedures are used for it which are also

applied in online banking.

Optimising the battery operation

If HomematicIP devices are not directly triggered, they remain in “sleep mode” or stand-by-mode,

which has positive inﬂuence on the battery consumption.

The system works with to different frequencies. For normal radio operation between

HomematicIP device, the 868.3 MHz band is used. Special functions like wake on radio – thus

"waking" of battery operated devices – and updates of the device software update (OTAU) use

an additional frequency (869.525 MHz) (see section “14.2.1 Device software update (OTAU)” on

page 116)

115

Range

The range of devices based on radio communication depends on numerous factors, especially in

buildings. This is why radio signals can be attenuated by special local structures, high humidity,

barriers like inappropriately positioned furniture or metal covered surfaces. These are called

attenuation. For indicating the range of radio signals, the so called open area radio frequency

has been established. It describes the range of radio signals outside, i.e. without interfering

inﬂuences, and with HomematicIP, it is at 150m to 600 m depending on the device. The range

in buildings is smaller due to the attenuation ; however, it is sucient in most cases to ensure

reliable radio communication. This especially applies, if the instructions of chapter „4.1 Wireless

range“ are considered for positioning the radio components.

Receive modes

HomematicIP dierentiates three dierent receive modes:

• Always listening is a mode in which the devices are listening permanently, i.e. they

are ready to receive radio signals at any time. This is the case for all HomematicIP

devices that are connected to the mains voltage. The low energy that is required for

permanent reception of radio signals, plays a subordinated role in comparison the

battery operated devices. Examples are pluggable switches and pluggable switch and

meter.

• Cyclical reception describes a receive mode for battery-powered devices, where a

radio connection is established at regular intervals. For instance, the HomematicIP

Radiator Thermostat is changing to receiving mode on a regular basis, e.g. to recall

the current temperature from the HomematicIP Wall Thermostat.

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