Seeing this was the first link in a google search for
"xbee 2.5 example"
I had to follow, and what do you know, very helpful 
Good guide cairn.
My experience.
After playing with Series 1 a few days ago I had to give the Series 2 (now ZNet 2.5) a go for their meshing ability.
The biggest help here was that one had to be re programmed as a co-ordinator.
I did not need to touch the CTS, RTS, Reset pins to do this in my setup.
Left them floating.
It may seem obvious but I missed it so will share here in case someone else finds it useful.
I had flashed them and got the Router/End Device talking to the Coordinator ok.
But the Co. would not talk to the end device.
Douh, I did not set the destination 
Since my project will have multiple end devices so I went with the broadcast scheme.
Yes lots of radio chatter but I would not have to deal with API mode
Destination set to broadcast on all devices in the network.
atdl0000ffffwr
Problem solved