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Application
The KNX RF/TP Coupler 673 secure is a KNX radio coupler in compact design. It connects KNX RF
devices of a radio line to the KNX Bus Twisted Pair and optionally supports KNX Data Security.
The device has an extended filter table (main groups 0..31). The coupler supports long frames and is
compatible with the ETS® software from ETS5.
The buttons on the front panel allow you to deactivate the telegram filters for test purposes. The LEDs
indicate operating states and communication errors on the bus.
Power is supplied via the KNX bus.
1
KNX Security
The KNX standard has been extended by KNX Security to protect KNX installations from
unauthorised access. KNX Security reliably prevents both eavesdropping on communication and
manipulation of the installation.
KNX Data Security describes the encryption on telegram level. This means that the telegrams are
encrypted both on the twisted pair bus and via radio.
1.1 KNX Data Security for the device
The KNX RF/TP Coupler 673 secure supports KNX Data Security to protect the device against
unauthorised access from the KNX bus. If the KNX RF/TP coupler is programmed via the KNX bus,
this is done with encrypted telegrams.
Encrypted telegrams are longer than the previously used unencrypted ones. For secure
programming via the bus, it is therefore necessary that the interface used (e.g. USB) and any
line couplers in between support KNX long frames.
1.2 KNX Data Security for group telegrams
Telegrams from the bus or from RF are forwarded or blocked according to the filter settings
(parameters and filter table). It does not matter whether the telegrams are unencrypted or encrypted.
Forwarding is exclusively based on the destination address. The security properties are checked by
the respective recipient.
