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KNX TUTOR SEMINAR

4 Different APCI Codings

4.1 General

The task of the application layer is to manage the values of the group objects on behalf of
the application program, process group telegrams as well as carry out management
functions.
In run-time communication (i.e. after configuration), the typical APCIs used are:

APCI Name

0000 GroupValueRead
0001 GroupValueResponse

0010 GroupValueWrite

These APCIs are used in conjunction in multicast communication, i.e. the target
addresses of these telegrams are group addresses, useful data is coded according to the
KNX Interworking Data types.

Configuration of bus devices is ensured via management functions, which are typically
stored in the ROM of the bus device. For such management functions, typically
connection-oriented (point-to-point) communication or broadcast (group address 0/0) is
used.

Very commonly used APCIs are:

APCI Name
0011 IndividualAddrWrite

0100 IndividualAddrRequest
0101 IndividualAddrResponse

0110 AdcRead
0111 AdcResponse

1000 MemoryRead
1001 MemoryResponse

1010 MemoryWrite
1011 UserMessage

1100 MaskVersionRead
1101 MaskVersionResponse

1110 Restart
1111 Escape

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