How can I connect a Magelis HMISTU to a Zelio Smart relay?

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The Magelis HMISTU (655/855) can communicate to a Zelio Smart relay via Modbus serial or Modbus/TCP (Ethernet).

For serial communication you would need the the following.
XBTZ9980 cable 2.5m or the ZBTZ9982 10m
SR3MBU01BD Zelio Modbus module

For Ethernet communication:
Ethernet cable
SR3NET01BD Zelio Ethernet module.

Both Zelio communication modules are compatible with the SR3B***BD smart relay only.