Why Xctu is not detecting xbee s2?

I have connected xbee s2 to pc. XCTU not detecting it. There is no problem with baud rate.

How are you connecting the XBee module to the PC?

What is the full part number of the XBee module you are working with?

What version of XCTU are you working with?

What is the exact message you are getting when you try to discover the radio?