Canon SPEEDLITE EL-1 Advanced User's Manual page 156

3.
Set as sender unit / receiver unit.
Press the joystick up / down / left / right or turn <
<
vertically.
4.
Set the transmission channel and wireless radio ID.
Refer to "Setting the Transmission Channel / Wireless Radio
details on how to set.
5.
Set the camera's shooting functions.
6.
Set all the Speedlites.
Set all the Speedlites to perform linked shooting to "sender unit" or
"receiver unit" in linked shooting.
Set the transmitters in the same way if any are to be used in linked
shooting.
If you change the setting from "receiver unit" to "sender unit" in Step 2,
the other Speedlites (or transmitters) set as "sender units" will
automatically become "receiver units".
7.
Install the receiver camera unit.
Set up all the receiver camera units within approx. 30 m / 98.4 ft. of the
sender camera unit.
Check that the <
> or <
> lamps of the receiver units are lit in green.
156
> to select
>, then push the joystick
ID" for