how to configure i/o of xbee ?

i configured the xbee by changing the disabled pin dio1 to input pin and output high . it doest work .is there any other configuration change that i have to do to use i/o pins directly?

Yup, you need to configure destination address parameters and IR/IC parameter depending upon which sampling method you wish to implement.

See this article, it has answers to all your queries regarding IO sampling:
http://knowledge.digi.com/articles/Knowledge_Base_Article/Digital-and-analog-sampling-using-XBee-radios

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