Star topology with S1 modules + Arduino

XBee & XBee Gateway XBee - 802.15.4
1

I have three XBee S1 modules and all of them fitted on to a Xbee shield which is fitted on a UNO board.

What I want to do is : Have one Xbee_01 as Co-ordinator and the other two Xbee_02 and Xbee_03 as End Points. I am not using the API mode as there is lot of data processing to be done by the Arduino and the co-ordinator simply has to pass on the received data to the cloud through WLAN. So its a simple transparent AT setup where XBee is only used for the radio link.

I have been reading similar questions and one was answered by mvut. The suggested setup was :

Coordinator
MY 0x01
DT0xFFFF

End node(s)
MY 0x02, 0x03, etc
DT0x01

Fine that appears easy. Some questions though :

  1. In a set up as above how many slaves can be there ?
  2. Can the Co-ordinator occasionally send some message to specific Slaves … like to reset the Arduino / change the sampling rate etc ?

Thanks for any tips.

2

You can use as many as you so desire. The radio in a 16 bit addressing configuration as above support up to 65550 addresses or nodes. That is assuming you have the bandwidth to support it.

Sure it can. Simply change the DL on the coordinator to match the MY of the receiver, then send the data.