Is there a example or document about JCO.createClient() for servergroup?

Can I use createClient() to connect to the loadbalance server, and I need a example for how to use loadbalance connection by JCO methods? I want to know how to fill the format parameter of the createClient() method?

What I have here is :

message server: xxx.xxx.xxx.xx

SAProuter: /H/2xx.xxx.xxx.xxx/H/

group/server: PRDGRP