Device address - Basic Documentation - RMK770-1

Communication via the KNX bus

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Air conditioning controller
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Basic Documentation
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Device identification

As described above, the network address consists of a combination of the area, line and device address, for example 0.2.10, where 0 stands for the area, 2 for the line and 10 for the device address.

Device addressing

Device addressing must be planned at the design engineering stage. Note the following points when assigning addresses:

  • Each device address may be allocated only once within an area and a line.

Device addresses in the range 1 to 251 must be used for the maximum 64 bus devices on a line (the same applies on a main line). Addresses 0, 150, 252, 254 and 255 are reserved for the following:

0: is used in each area or each line for the area or line coupler respectively.

150: is the factory-set device address for the OZW772 web server (device address 150 can be modified).

252: is used to connect the RMZ792 bus operator unit, i.e. the bus operator unit uses this address if it is free; otherwise it starts at 252 and looks for the next lower unused address.

254: is used to connect the ACS790 software on PC/laptop, i.e. the OCI700.1 service tool adopts this address if free, or starts at 254 and looks for the next lower unused address.

255: is the factory-set device address of the Synco bus devices (see the notes below).


The factory-set address 255 in the Synco bus devices prevents communication problems in the commissioning phase. This is because devices with this address do not send any data. However, they can be controlled manually, and can receive the new device address setting, for example.

The device addresses of the Synco 700 RM… controllers can be set with the RMZ790 and RMZ791 operator units (see Section 4.2) or with the ACS790 software.

Remember not to use device addresses 150, 252 and 254 when addressing the bus devices.