OH2 Modbus Binding: How to connect to a Modbus Master

I have got a Modbus TCP Master at home. I want to connect to with the openhab modbus binding.

How can I configure the openhab Modbus binding to be a slave Modbus device, instead of being master as well?

Two Modbus Master can not talk to each other. But one Master can talk to many slaves.

Has anybody an idea what I have to do?

is solved see