No readable Data over EBus

Hi,
i´m trying to get started with my Esera USB EBus coupler, but i have very much trouble.

When i connect a serial Terminal i get only that unreadable signs (See picture).
Also when i use the scre to adjut it don´t change (only when there is no more signal scre in extrem positions)

Is there anything wron ewith my Vailant heating unit?

Coupler:
Esera USB EBus Coupler
Terminal:
Putty 2400 8n1
Heating Unit Vailant