Page 196 - Basic Course

KNX BASIC COURSE

7.2 Description format

A group address describes a function. It is therefore also directed at the operational
equipment and not at the bus devices concerned performing this function (sensors –
actuators). For instance, you want to dim light 5 on the 1st floor in the 2nd room. It is not
appropriate to give a group address such a long description. That is why you should
establish a scheme before starting a project. It should contain abbreviations with all the
necessary information about
location where the function takes effect, e.g. Building-floor-room
controlled equipment or equipment group, e.g. Light 1, Shutters 1-4, Heating for
whole floor
Type of function (e.g. dimming, switching, set value, shutter movement)
(see also the comments in the device lists).

Example: A block of 3 buildings, 4 floors per building, and up to 20 rooms per floor:
1) H1F3R12_L05_on/off = means: Lights 5 in room 12, 3rd floor, building 1,
switching.
2) H3F2R08_L01-04_dim = means: Lights 01 – 04 in room 8, 2nd floor, building 3,
dim continuously.
3) H2F3R07_Shu01-03_stop = means: Shutters 1-3 in room 7, 3rd floor in building 2,
stop
4) H2F0R03-06_Shu_mov = means: Move all shutters (up/down) in rooms 03 – 06,
ground floor, building 1
5) H1-3_Light_central_on/off = means: Central switching of all the lighting in buildings
1, 2 and 3.
6) H1F1R14_Heat_SetPt= means: Heating information – desired setpoint
temperature in room 14, 1st floor, building 1.

The examples mentioned above illustrate how you can establish self-explanatory
descriptions with only few characters. Please note that the name for the location and
equipment group should be re-used for the actuator (see Inserting / Copying devices).
This makes the assignment much easier afterwards.

Home and Building Management Systems KNX Association
KNX Project Design with ETS: Advanced ETS4_Planning complex_E0411c 20/59