Connect ME and Siemens PLC

Embedded Devices Plug N' Play
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1

How can I interface (ETHERENET side) a DIGI Connect ME ETH/Serial to a SIEMENS PLC ?
TCP SOCKET mode ?
RealPort ?
Are there any drivers for Siemens PLC or have I to write my routines from scratch ?

2

If this is Profinet IO device, you should use Ethernet bypass