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HomeMatic IP system Manual

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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
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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.
… 128 …


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