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1. You have to download X-CTU from Digi’s website to configure ur Xbee
2. Write one’s SH and SL addresses in DH and DL address of another Xbee then program ur Xbee
3. Check the interface using ur laptop and computer..
After configuring ur Xbee u can connect it with ur microcontroller, although u don’t require a level shifter but if u use MAX 232 to inetrface through Xbee board it will be Good…
use SIP resistor of 10 ka to give a pullup
it is a package of parallel resistors having single inline package 9 pins use this to provide VCC on all pins form 33 to 40….
OR you can use port 2, then you will not need any pullup resistor on your Keypad