JUMO LOGOSCREEN cf, Interface Description

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3 Connecting the interface
A screened twisted pair is used as a transmission line. The connection can be
made as a line, ring, star or mixed structure (free topology).
Line structure
Each physical end is provided with a termination resistance of 100
Ω
, which is
activated by a switch on the module.
Chapter 3.3 “Setting the LON termination resistance”
Ring structure
In this wiring arrangement, the network remains functional even when there is
an interruption. The termination resistance of any module in the ring must be
set to 50
Ω
.
Chapter 3.3 “Setting the LON termination resistance”