Canon SPEEDLITE EL-1 Advanced User's Manual page 167

Setting the Transmission Channel
Follow the procedure below to set the communication channel of the sender unit. The
channel set should be the same for the sender unit and receiver unit. For details on the
receiver operation procedure, refer to the Instruction Manual of the Speedlite equipped with
the optical transmission wireless receiver function.
1.
Push the joystick vertically.
2.
Select an item in (1).
3.
Set a transmission channel.
Push the joystick up / down / left / right, or turn <
channel item, then push the joystick vertically.
Push the joystick up / down / left / right or turn <
1 to 4, then push the joystick vertically.
167
> to select a
> to select from Ch.