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KNX BASIC COURSE

Figure 31: Group addresses: Read value

5 Group addresses: Read value

The diagnostics function “Group Monitoring” also offers the possibility to reading the
current status of a group object.

Select the menu Diagnostics / Group Monitoring and hit the “Start” button. Click on the
field ‘Group Functions”. A group address can be entered in the field “Group Address” or

selected via the symbol from the list of existing group addresses in the current
project.
A read request is sent on the bus via the “Read” button: the resulting telegram shows the
type “Read’ in the column ‘Type’ AND does not show any value in the “Info” column. The
indicated source address is the individual address of the interface to the bus. The value of
the response telegram (Column “Type” indicates “Response”) is displayed in the “Info”
column.
Values with a preceding $ sign are hexadecimal values.
If a datapoint type (DPT) has been set in the project for the group object with the queried
group address, the values are interpreted on the basis of the corresponding DPT
standard, e.g. DPT_Switch (1.001) -> On/Off.

It is only possible to read out group objects for which the read flag has been set. If group
addresses are queried, which are not specified as sending group addresses in the group
objects, the reply will be send with a different group address (the allocated sending one)
than the one used in the read request.

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