Canon Speedlite 430EX III-RT - Manual (Page 50)

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To perform radio transmission wireless shooting, set the master unit
and slave unit with the following procedure.
Set to < 'M >.
Press the < I > button of the < S >
cross keys.
Turn < 9 > to select < ' M >,
then press < 8 >.
Set to < 'x >.
Operate and set the flash you want to
set as the slave unit.
Select < ' x > in the same
way as for the master unit setting.
To avoid interference with wireless flash systems using radio
transmission used by other photographers or with other devices using
radio waves (wireless), you can change the transmission channel and
wireless radio ID.
Set the same channel and ID for both the master
unit and slave unit.
Wireless Settings
Master Unit Setting
Slave Unit Setting
Transmission Channel/Wireless Radio ID Settings
To perform normal flash shooting, select < F > to clear the wireless
(master/slave) settings.
When establishing multiple radio transmission wireless flash systems,
interference between flash systems may occur even if the flashes are set to
different channels. Set different wireless radio transmission IDs for each
channel (p.51).