How to configure Xbees series 1 to function as muliple multipoint-to-point?

Dear Digi Team,

I currently have three xbees series1. Two of the xbees will be connected to sensors directly (reading analog data) - not connected to a microcontroller. The third xbee is connected to arduino YUN. The two xbees connected to the sensors should send data to the third xbee that is connected the microcontroller. Could you please help me in configuring the xbees? Should I be using API mode? The xbee connected to the microcontroller shoulf be configured as coordinator and the others as end devices.

Any help would be appreciated. I am really stuck here.

The information located at will explain how to configure the radios for this.