Network topologies - Basic Documentation - RMK770-1

Communication via the KNX bus

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Three network topologies are illustrated on the next three pages. Note among others the details of the LTE filter table (see Section 8.2).

Example 1

KNX network with area and line couplers

LTE filter table: 1) Normal (route)


As previously stated, one line (KNX TP1) can accommodate max. 64 bus devices. The addresses (x.y.250) should refer to the highest recommended bus device address (250}, not the max. possible number of bus devices.

Example 2

KNX network linked via IP router to IP network (area line 0)

LTE filter table: 1) Normal (route), 2) Route all

Alarm sinks

If Synco devices are used as alarm sinks (see the OZW775 central communication unit and RMZ792 bus operator unit in the figure), these alarm sinks must be installed directly after an IP router.

Alarm signals

To enable alarm sinks to receive all alarm signals (and other data) from the IP network, the IP router filter must be set to "Route all" (see Sections 8.2.1 and 8.2.5).

Example 3

KNX network with third-party devices in area 15

LTE filter table: 1) Normal (route), 2) Route all, 3) Block all

LTE filter table

If the filter is set to "Block all" for area coupler Lc 15.0.0, no LTE telegrams are transmitted between area 15 and the rest of the network.

The "Route all" setting for line coupler Lc 15.1.0 means that there is no filtering between line 15.1 and main line 15.

Bus power supply

If the devices in area 15 (e.g. third-party products) do not supply power to the bus, an N125/x2 power supply unit must be installed in each line (main line 15, line 15.1 plus further lines 15.x, if applicable) for the bus power supply.