Connections to sensor-only xbee

I'm having some serious problems with X-CTU and an Xbee chip that is supposed to operate as a sensor only. Its board connects only ground, vcc and d0, and led/resistor to ad5. I am wondering what to do with din and dout - the manual does not specify anything. After successfully flashing the chip with X-CTU it started acting up on its board (assoc led flashes randomly and varies depending on hand proximity.) It seems to communicate using Andrew Rapp's library, but X-CTU will not recognize it anymore. I checked for any board shorts or opens.