Canon Speedlite 550EX Instructions Manual page 55

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Setting the MasterlSlave Channel
Press the <
+ :>
or < > button to
set the same channel No. (I , 2, 3,
or 4) as the master unit's.
6
Press the < SEl/SET > button .
Tile
IamI
icon
and channel
N-o.
will
be
displayed.
" the
ITIIISI8f un~
and slave
!.InU(s) are nol
sal
10 !he same cha!lnel N-o .. the masler unil
wil be
unable to lri9ger
lhe
slaye unit's
/lash. Make
sure lhe channel No. is !he
same.
55