configuration info

in my application i am using xbee 865 its working fine for my requirement. while i am replacing xbee 865 to xbee s2b its not at all working but when i starts using pro s1 then it starts working fine. what is problem with xbee s2b please provide a solution to my problem

The S2B you are referring to is a Zigbee enabled product. You need to configure one of them as a Coordinator in order to establish a network and allow for two way communications to occur.