Fronius Smart Meter 240V-3 UL Instructions De Service page 22

Position of the primary meter in the consumption branch. *Termination resistance R 120 Ohm
Position of the primary meter at the feed-in point. *Termination resistance R 120 Ohm
The following must be observed in a multi meter system:
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Connect the primary meter and the battery to different channels (recommended).
Distribute the remaining Modbus participants evenly.
Each Modbus address is assigned only once.
Place the terminating resistors individually for each channel.