XBus requires individual "ID" for each Servos or XBus converter output.
XB1-CPG provides the most simple way to carry it out by wire.
#1 Connect Servo or XBus converter harness to the XBus port.
#2 Set the both dial to 0/0 and press "SET" to enter setting procedure.
#3 Select the number to set Main ID and press "SET" .
#4 The indicator starts flushing fast to show it’s ready to set Sub ID.
Select the Sub ID and press "SET"
DMSS Serial Communication System XBus Special page
What is XBus?[PDF]