If it is not already there, add an XBee to XCTU so it is listed in the Radio Modules list. If using two computers, add the module attached to one of the PCs to the corresponding instance of XCTU. Open the serial connection of the radio module: select the XBee in the Radio Modules section, and click the Open serial connection button. Note: the background will change to green to indicate that the connection is open. Repeat steps 3 and 4 for the other XBee. If using two computers, repeat them in the other PC. If using only one computer, the consoles will be seen in two tabs. Click the Detach view button to see both at the same time.