Page 32 - Serial Data Transmission and KNX Protocol

KNX TUTOR SEMINAR

MemoryResponse
Response to MemoryRead containing the requested data.

10 01 XXLLLL aaaaaaaa bbbbbbbb dddddddd . . . dddddddd

L...L: length of the memory area read (bytes)
a...a: starting address of the memory area read (high byte)
b...b: starting address of the memory area read (low byte)
d...d: contents of the memory area read

If part of the requested data lies in a protected memory area or does not exist, then the
bus device returns the message L...L =0 and no data at all.

Memory Write
Writes a continuous data block into the memory of the addressed bus device, starting at
the specified address.

10 10 XXLLLL aaaaaaaa bbbbbbbb dddddddd . . . dddddddd
L...L: number of bytes to be written
a...a: target address of the 1st byte to be written (high byte)
b...b: target address of the 1st byte to be written (low byte)
d...d: data to be written
If part of the requested data lies in a protected memory area or does not exist, then the
addressed bus device ignores the write request.
Some bus devices automatically emit a MemoryResponse immediately after the write
instruction (mode called ‘verify’).

User Message
5
Initiates the exchange of data between two microcontrollers in the bus device .

10 11 dddddd . . . Dddddddd

d...d: data

MaskVersionRead
Requests the addressed bus device to return information on its supported system profile
by means of its mask type and mask version.

11 00 Xxxxxx

4
x...x: no significance

5 Rather an exception in current devices
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