Canon Speedlite 600EX II-RT Manual (en)

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116
C: Setting Custom Functions
C.Fn-12:
3
 (Flash recycle with external power)
0: 1 (External & internal power)
Charges using both internal and external power sources.
1: 2 (External power only)
Internal power source is needed to control the Speedlite. By using 
external power source for charging firing of the Speedlite, you can 
minimize the depletion of the internal power source.
C.Fn-13:
6
 (Flash exposure compensation setting)
0: 4 (Speedlite button and dial)
1: 5 (Speedlite dial only)
You can directly set the flash exposure compensation amount and 
flash output by turning <9> without pressing the <@> button.
C.Fn-20:
7
 (Beep)
You can enable a beep to sound when flash recharge is complete.
0: OFF (Disable)
The beep does not sound.
1: ON (Enable)
In normal shooting (on-camera flash photography), the beep will sound 
when the flash unit is fully charged.
When the Speedlite is set as the master during radio transmission 
wireless shooting, the beep will sound on the master unit when all flash 
units (masters and slave units) are fully charged. You can confirm 
recharging of the entire wireless system by the beep tone on the 
master. For the slave units, either 0 or 1 can be set for C.Fn-20.
When the Speedlite is set as the master during optical transmission 
wireless shooting, a slave in radio transmission/optical transmission 
wireless shooting, or a master/slave in linked shooting, a beep will 
sound on each flash set to 1 at full charge (p.84).
When 1 is set, the beep will also sound when the temperature of the flash 
head rises and flash firing is restricted (p.124).