Canon ST-E3-RT-V2 Manual page 21

 Setting the Sender Unit Transmission Channel / Wireless
Radio ID
Use the following procedure to set the sender unit's transmission
channel and wireless radio ID. Set the same channel and ID for both the
sender unit and receiver unit. For the receiver unit settings, see the
flash's instruction manual.
1
Display <O>.
Press function button 4 to display

<O>.
2
Set a channel.
Press function button 1 <C>.

Turn <9> to select "AUTO" or a

channel from Ch. 1 to 15, and press
the <8> button.
3
Set a wireless radio ID.
Press function button 2 <H>.

Turn <9> to select the position

(digit) to set, and press the <8>
button.
Turn <9> to select a number from 0

to 9, and press the <8> button.
Repeat step 3 to set a 4-digit number.

Press function button 4 <?> to

return to the shooting-ready state.
When transmission between the
sender unit and receiver unit is
established, the <D> lamp is lit in
green.
Wireless Settings
21