In order to transmit data wirelessly between the XBee modules, set the DH and DL parameters on each module to match the SH and SL (SH + SL = MAC address) of the other module. For example, if the MAC of XBee A is 0013A20012345678, then the DH of XBee B should be 0013A200 and the DL 12345678. Begin by restoring the default settings of all XBee modules with the Load default firmware settings button at the top of the Radio Configuration section. Next, use XCTU to configure the parameters outlined in the table shown on this slide. Finally, write the settings of all XBee modules with the Write radio settings button at the top of the Radio Configuration section.