Difference between End User and Router Xbee

I’ve only recently started working with xbee s2 Znet 2.5, and although I’ve read the datasheet, I failed to understand how to differenciate an end user xbee from a router xbee during the firmware config setup.
So how does a xbee becomes a child of a router or a coordinator?

This is relevant to me, because I’m trying to create a Star network working in AT mode.
I 've no need for any modules to be battery powered.

Thank your in advance for your help.

I think the only way to idetify router and end device is by sleeping parameters.
Refer the product manual for the detailed explanation about ZNet at the following link, http://ftp1.digi.com/support/documentation/90000866_F.pdf