DBCO Connectivity from SAP to AS400

Hi,

I would like to know the detailed steps involved in connecting SAP to AS400?

From - SAP ECC 6.0 (BackEnd - ORACLE11.2.0.4.0/ BASIS – Release 701)

To - AS400 7.1 (BackEnd - DB2 7.1 with Microcode level)

I am not from a BASIS background but need these information for a connectivity we are trying to establish between these systems without a middleware. Suggestions/SAP notes will help me to achieve this further.

Thanks!