Canon SPEEDLITE 320EX Mode D'emploi page 37

Do not place any obstacles between the master unit and slave unit(s).
Obstacles can block the transmission of wireless signals.
Even with multiple slave units, all of them will be controlled in the same
way via wireless.
If the slave unit's auto power off takes effect, perform FE lock operation
or turn the slave unit off and on again to turn on the slave unit.
Attach the 320EX to the provided
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mini stand and position the flash.
Use the horizontal bounce function
and point the sensor of the slave unit
toward the master unit.
Indoors, you can perform wireless
flash shooting using the reflection of
the surrounding walls without having
the wireless sensor of the 320EX
facing the camera. Position the
320EX while checking that it can fire.
Take the picture.
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Set the camera and take the picture,
in the same way as with normal flash
shooting.
When you are done with wireless
flash shooting, set [Wireless func.] to
[Disable].
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