Gira 5110 00 Product Documentation page 51

i KNX RF systems always influence each other physically when they are spatially located in
each other's radio range and two or more transmitters transmit more or less
simultaneously, which is perfectly possible. Radio telegrams can be superimposed. In this
case, the receivers can no longer evaluate the affected radio telegrams. For more
information on the transmission property and superposition of RF telegrams, refer to the
chapter "Basic physical principles" in this documentation.
RF topology and ETS
Media couplers are the link between a specific KNX RF environment and a wired KNX TP
installation. With regard to the routing property of telegrams, media couplers function like
standard KNX TP backbone/line couplers. This means that RF devices can communicate with
TP or IP devices and vice-versa.
Media couplers possess filter settings and filter tables. The physical address defines whether a
media coupler is a line coupler or a backbone coupler.
Optionally, the Gira media coupler can additionally or alternatively work as an repeater. A
repeater repeats the radio telegrams received in its RF line by retransmitting them immediately.
This allows an extension of the range of a KNX RF installation, meaning that it is possible to
position RF devices as required in a building, even in the case of difficult transmission and
reception conditions.
i The Gira media coupler is a device which allows the media type "RF" on the lower-level line
and the media type "TP" on the higher-level line.
As with all other KNX components with S-Mode commissioning, KNX RF devices are configured
and commissioned using the ETS. In consequence, RF devices also possess a physical
address, parameters and communication objects. In addition, a unique domain address is
assigned to each RF line in the ETS. Only devices with the same domain address can
communicate with each other.
i Addressing, configuration and diagnostics of KNX RF devices are only implemented in the
ETS of Version 5 or higher. Older versions of the ETS do not possess manufacturer-
independent KNX RF support.
KNX RF systems are addressed, configured and diagnosed in the normal fashion via the ETS
data interfaces.
- Use of a KNX RF USB data interface (Figure 23):
All the devices of an RF line or an RF area can be programmed and diagnosed directly via
the KNX RF USB data interface. It is important that the KNX RF data interface has a valid
physical address of the RF line or the RF area and is configured with the same domain
address.
In addition, all the other devices of the KNX installation can be programmed using a media
coupler with an identical domain address. A wired data interface is not essential for this.
If necessary, the KNX RF USB data interface can also be used in the group or bus monitor
of the ETS5, in order to record RF telegrams of the corresponding RF domain.
i In the group monitor, a KNX RF USB data interface only displays group-addressed
telegrams of the same RF domain. In addition, the interface displays physically addressed
telegrams, provided that it is also used as the ETS programming interface. In the bus
monitor, a KNX RF USB data interface only displays group-addressed telegrams.
Order No. 5110 00
Software "Media coupler / repeater"
Parameters
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