Xbee s2 sending problems


I am currently trying to send analog datas from sensors connected to xbee serie 2 devices. Datas are retrieved by a Raspberry Pi.

At the moment, I want the xbee (AT end device configured) to send what it is reading on its AD0 input (pin 20) to the other xbee (AT coordinator configured).
I can see that they are communicating each other (RSSI ans ASSOC are on). BUT I cannot have the data at the coordinator point.
I already checked again my configurations and they’re right. Do I need to configure them on API mode?
If not, what can be the problem?

Thanks in advance.

ALL ADC communications requires that the module receiving the ADC data and to output it on its UART must be in API mode…