Zennio KNX-IP Router / Interface PLess
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12
Physical address filtering
: when the device receives a telegram where the
destination address is a physical/individual address (for example, during
downloads), it will compare such address with its own physical address (no
particular filter table is required for physical address filtering, but a simple
comparison).
The physical address of the line coupler determines the line it belongs to,
which then, and according to the parameterisation, determines if the telegram
will be routed or eventually dropped (blocked). This can be parameterised
separately for the mainline and for the line.
Example
:
in the example shown in Figure 5, if the coupler with address 3.2.0
reads a telegram on the mainline destined to a device with individual address
3.1.2, it will compare both addresses and conclude that 3.1.2 does not belong
to the secondary line, and therefore not transmit it.
Notes
:
➢
The device that sends a telegram needs to have been assigned a physical
address that really corresponds to its line. In Figure 5, if the device with
address 3.1.1 (a KNX programmer, for instance) changes its address to
7.7.255, it will not be able to send telegrams to, for example, the device
with address 4.0.1.
➢
As device programming consists in sending telegrams destined to a
physical address, in order to perform downloads to a device in a certain
line (for example, the device with address 4.1.1 in Figure 5) from a
programr not in that line, it is necessary that the line coupler is configured
to let pass all physical addresses from the main line.
