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HomeMatic IP system Manual

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• Another receive mode, especially for battery operated HomematicIP devices is called
wake on radio. In this case, the receiver is “woken up” to receive radio data. During
the remaining time, the receiver stays in energy saving “sleeping mode”. Due to this
function, e.g. the HomematicIP Window / Door Contact can immediately reduce
the temperature of radiator thermostat, if an open window has been detected. If the
signals are directed to another HomematicIP device, the receiver will go back to the
energy saving “sleeping mode”.
• During the development of HomematicIP, the wake on radio function of Homematic
has been further improved. In Homematic, all devices “wake up” as soon as the radio
communication is active on the 868.3 MHz band. For HomematicIP, this function
has been moved to another frequency (869.525 MHz). However, devices that support
wake on radio are woken up from “sleeping mode” only if this is really required.
Another advantage is that this function does not influence on the duty cycle limit of
the corresponding device.
All three methods are proven in millions of devices by eQ-3 and protected by patents for devices
with battery operation.
13.10.1 Device software update (OTAU)
To keep your HomematicIP devices up to date, HomematicIP oers the opportunity to update
the device software (firmware) of the components. The device firmware controls all function-
alities of your HomematicIP devices. The OTAU method (Over The Air Update) is an especially
comfortable method to provide new firmware to single devices, e.g. radiator thermostats, via
radio communication.
In a HomematicIP solution, the devices software updates are performed in the background
(background OTAU). In the server ( HomematicIP cloud) a device list with the relevant serial
numbers and firmware versions is provided. If for one or more of your HomematicIP devices
a new device software is available, the HomematicIP cloud forwards this information to your
HomematicIP Access Point. This transfers with every send radio telegram a part of the new
firmware file into the memory of the device.
13.10.2 Duty cycle
Like various other radio based devices, also HomematicIP components are subject to legal
regulations regarding the transmission time of radio signals (Duty cycle limit). The aim of this
regulation is to ensure a high level of transmission security of all devices working in a defined
frequency range using the short transmission times. HomematicIP devices operate in the 868.3
MHz and 869.525 MHz frequencies. The second frequency is mainly used for Wake On Radio
(see section “14.2 HomematicIP radio protocol and receive modes” on page 115).114
In the 868.3 MHz frequency range that is used for radio transmission of HomematicIP devices,
the maximum transmission time of any device is 1 %, i.e. 36 seconds in an hour. If this limit is
exceeded, the corresponding device may transmit only after the maximum transmission time
falls below the limit, for example after the hour expired.
The relatively low duty cycle value of 1 % oers the benefit that the radio channels are not
continuously occupied due to the short transmission times. Thus, there is a very high security
level at all times. This also has positive eect on the radio wave impact (see section “4.1 Wireless
range” on page 15).
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