I am trying to communicate between two XBee S2 modules both in API mode using the XCTU tool. One device as router and another device as coordinator. I got successful communication of two XBee modules in AT mode and either of them as API or AT mode. But when I configure both of them in API mode they are not communicating.
After giving a lot of try i found two tricks in configuring X Bee modules
If your X Bee module is not getting read, just write with the suitable firmware
choosing manually
If it is not responding to read or even write also, connect reset pin to ground using single wire for few second.