Problem faced using program X-CTU

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i have configure settings both xbees series 1. 1 of them receiver, other transmitter. managed make both xbees communicate each other successfully. there problem whenever disconnect 1 of xbee , connect , test, experience problem said "unable communicate".
then un-mount xbee , shield , upload simple program blink examples shown in arduino ide. after doing that, when mount xbee , shield , test on program x-ctu, working fine.
can tell me whats problem? have tried changing buad rate, parity bit, still doesnt work.
pls me, need solution urgently counter problem.

when running x-ctu, configure xbee attached shield attached arduino, atmega328 (or 168 or whatever) chip supposed removed first.

otherwise, arduino interferes data being sent x-ctu xbee.

if chip laying on table, unpowered, not matter code loaded on it.


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