Canon Speedlite 430EX III-RT - Manual (Page 67)

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When using an EOS DIGITAL camera released in and after 2012
(except EOS REBEL T5/1200D), such as EOS-1D X, you can perform
linked shooting, which automatically releases the shutter of a slave
camera unit by linking it to the master camera unit. You can perform
linked shooting with up to 16 units, including both master units and
slave units. This is convenient when you want to shoot a subject from
multiple angles at the same time.
To perform linked shooting, attach a Speedlite or a Speedlite Transmitter
that supports radio transmission wireless shooting to the camera.
Note that when used with a camera released up to 2011 or EOS REBEL
T5/1200D, the unit can be used only as a “master camera unit”. The unit
cannot be used as a “slave camera unit”.
Before performing the operations on the next page, attach a Speedlite
or transmitter to all the cameras to be used for linked shooting. For
details on setting other devices, refer to the instruction manuals of the
devices.
Linked Shooting with Radio Transmission
Slave
camera unit
Slave
camera unit
Slave
camera
unit
Slave
camera
unit
Master camera
unit
Transmission distance
Approx. 30 m/98.4 ft.
The combination of an EOS camera and 430EX III-RT set with linked
shooting function is called either “master camera unit” or “slave camera unit”.