Hirschmann RS20 Programming Manual page 80

Ring/Network coupling
Figure 42: Selecting the coupling mode
Select "Ring coupling" if you are connecting a redundancy ring.
Select "Network Coupling" if you are connecting a line structure.
Delete coupling configuration
The "Delete coupling configuration" button in the dialog allows you
to reset all the coupling settings of the device to the state on delivery.
80
5.2 Preparing a Ring/Network coupling
Redundanz L2P
Release 5.0 04/09