Settings for xbee series 2 sleep.

Hi all, I am trying to set my xbee radios to sleep for a one minute period and then turn on for a second and then go back to sleep.

I have have had no luck and now am completely confused.

Does any one know the correct settings in xctu to do this???

(Using xbee series 2, Znet 2.5 router/end device and coordinator)

Thanks...
Kierin