How to make loopback on Xbee S2?

Hi!
Plz help me.
How to make hardware loopback on XBee S2?
Should i connect DOUT to DIN straight or i should use resistor?
3.3V power supply should be connect to VCC?

Short Data in to data out direct, provide 3.3V to VCC and GND to 0V.

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