Canon Speedlite 430EX III-RT - Manual (Page 66)

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Remote Release from a Slave Unit
When using an EOS DIGITAL camera released in and after 2012, such
as EOS-1D X, you can perform remote release (remote control
shooting) from a 430EX III-RT set as a slave unit during radio
transmission wireless shooting.
Select < L >.
Press < 8 > of the slave unit.
Turn < 9 > to select < L >, then
press < 8 >.
X A release signal is sent from the slave
unit to the master unit, and the picture
is taken.
Remote Release from a Slave Unit
Modeling flash is not possible from a slave unit with cameras released up
to 2011 or EOS REBEL T5/1200D.
For the precautions related to modeling flash, see page 36.
When C.Fn-02-1 is set on the master unit, modeling flash will not be fired
even if you select <
M >.
When there are two or more master units (p.58), the flash signal is sent to
the main master that has the <
D > lamp lit in green.
Remote release is not possible from a slave unit with cameras released
up to 2011 or EOS REBEL T5/1200D.
Shooting is not possible when autofocus fails. It is recommended that
you set the focus mode switch of the lens to <
MF >, manually focus on
the subject, then release.
Remote release is performed with “Single shooting” regardless of the
camera’s drive mode setting.
When there are two or more master units (p.58), the release signal is
sent to the main master that has the <
D > lamp lit in green.