Is it possible in SAP NetWeaver AS ABAP 7.31
Server nodes are available only on J2EE systems. Connecting to a specific server node is mentioned in the SAP note 1589567 - How to login to a specific J2EE engine server node
If the system is based on 7.31 then follow this SAP note 1440724 - Addressing server nodes directly in AS Java
Regards
RB