coordinator to router in n/w scanning show the bidirectional,in same router to end device show only uni directional why?

I am using XCTU s/w and Zigbee protocol and xbee series2.and i am commands sending through in API2 mode. In mesh networking the router can received any commands form coordinator?and any commands send to end device? How to set configuration settings for data transmissions from coordinator to end device through router?

In all zigbee communications, an End device polls it parent for the data. To send data to a specific node such as an End device, simply set the DL and DH of the node sending the data (Coordinator) to match the SL and SH of the End device.