Integrating XBee X24C with NYCE Motion Sensor NCZ-3041-HA

I have been trying to integrate XBee2 (Family:X24C) with a NYCE motion sensor (ModelNCZ-3041-HA). XBee is the coordinator with API=2 and ZS=2. Motion sensor is the ZED and it shows up on network scan. However, the LED status on the sensor indicates that it has not joined the network. Does anyone have any experience on this setup? What has to be changed in the XBee settings for the sensor to register on the network?