Canon Speedlite 600EX II-RT Manual (en)

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Wireless Settings
You can set whether or not to fire the master unit as a flash that controls 
the slave unit. When master flash firing is set to ON, the master unit is 
fired as firing group A.
1
Display <N>.
 
Press function button 4 to display 
<N>.
2
Set the master flash firing.
 
Press function button 1 <4> to 
set the master flash firing to ON or 
OFF.
g: Master flash firing ON
d : Master flash firing OFF
Master Flash Firing ON/OFF
Master flash 
Even when master flash firing is set to OFF, the flash firing for controlling the 
slave unit (optical transmission) is performed. Therefore, depending on the 
shooting conditions, the flash fired for controlling the slave unit may be 
captured in the picture.