Page 48 - Basic Course
P. 48
KNX BASIC COURSE
7 Coupler - Block diagram
New line coupler
Primary line on bus connector
Transformer
Flash‐ROM with RAM with
filter table and operating data Electrical
operating system
insulation 1000 V
LC/BC
2 1
Transformer
Secondary line Primary line
Secondary line on bus connector
Figure 7: Block Diagram: new line coupler type
The coupler is designed for DIN rail mounting. In operation, for current line couplers the
primary line as well as the secondary line is connected via standardised bus connectors.
Current couplers (as from July 2003 onwards) can be programmed both from the primary
line as well as the secondary line.
Current couplers are supplied from the primary line and only have one controller. This has
the advantage that the coupler can report secondary line power down.
Current couplers are equipped with Flash ROM memory. Contrary to the old coupler
types, they do not need backup battery power for supplying the memory containing the
filter table.
The couplers electrically isolate the lines from each other.
Home and Building Management Systems KNX Association
KNX TP Topology Topology_E1213a 9/24
