22/07/2008, 07:51:12
KNX RF devices from Hager and Siemens use during normal operation the
same telegram formats and the same data coding, obviously, and are
therefore compatible.
However, Siemens has opted for a way of programming the devices, where
the devices configure themselves mutually two-per-two, the so-called
Push Button Mode (PB-Mode). The need for this comes from the habits of
the installers in the envisaged markets.
Hager on the other hand has opted for a way where one central device,
a Controller, connects to each device separatley and links the devices
by assigning them an Individual Address and Group Addresses. This is
called Controller Mode (Ctrl-Mode).
Ctrl-Mode devices cannot be linked in PB-way to PB-Mode devices and
the Controller cannot program Ctrl-Mode devices. So, the devices are
compatible during runtime, but not during configuration. It is planned
that this link can be done via ETS 4.
Today, only 5 % of the KNX devices are RF.
ZigBee is not yet a standard. It however bases on 802.15.4, which
however only foresees point-to-point communication, has limited
support for repeaters and has trouble indeed with battery life, but
also with _runtime_ interworking. KNX is RF _is_ compatible with EN
50090-5-3 and offers in practice already a larger range of functions.
Thanks to the lower frequency (868 MHz instead of 2,4 GHz, which
allows less disturbances and larger transmission distances) and the
high transmission - and reception signal requirements, KNX RF is per
definition very reliable.
Experts from member companies in KNX Association guarantee that the
KNX RF specifications stay in line with the European regulations and
are prepared for all modifications in legislation (frequency band,
access, transmission power, duty cycle, energy consumption, ...) that
may come.
same telegram formats and the same data coding, obviously, and are
therefore compatible.
However, Siemens has opted for a way of programming the devices, where
the devices configure themselves mutually two-per-two, the so-called
Push Button Mode (PB-Mode). The need for this comes from the habits of
the installers in the envisaged markets.
Hager on the other hand has opted for a way where one central device,
a Controller, connects to each device separatley and links the devices
by assigning them an Individual Address and Group Addresses. This is
called Controller Mode (Ctrl-Mode).
Ctrl-Mode devices cannot be linked in PB-way to PB-Mode devices and
the Controller cannot program Ctrl-Mode devices. So, the devices are
compatible during runtime, but not during configuration. It is planned
that this link can be done via ETS 4.
Today, only 5 % of the KNX devices are RF.
ZigBee is not yet a standard. It however bases on 802.15.4, which
however only foresees point-to-point communication, has limited
support for repeaters and has trouble indeed with battery life, but
also with _runtime_ interworking. KNX is RF _is_ compatible with EN
50090-5-3 and offers in practice already a larger range of functions.
Thanks to the lower frequency (868 MHz instead of 2,4 GHz, which
allows less disturbances and larger transmission distances) and the
high transmission - and reception signal requirements, KNX RF is per
definition very reliable.
Experts from member companies in KNX Association guarantee that the
KNX RF specifications stay in line with the European regulations and
are prepared for all modifications in legislation (frequency band,
access, transmission power, duty cycle, energy consumption, ...) that
may come.