Canon Speedlite Transmitter ST-E2 Instruction manual - Page 7

(4) Channel Setting E*:RATIO 3. Readying the 550EX (Slave Setting) (1) Slave settingIPower on (2) Channel setting To prevent wireless signals from being transmitted to unrelated Speedlite 55OEX units in the vicinity, you can set a channel different from the one used by the unrelated Speedlite 550EX units. One of four channels can be set. The ST-E2 (master)and slave Speedlite(s) must be set to t h e same channel No. P r e s s t h e < CH. > button a n d select the desired channel. - Each time the button is pressed the channel indicator changes in the following loop: 1 + 2 -.3 -.4 1 The ST-E2 and Speedlite 550EX must be set to the same channel No 1Set the wireless selector to < SLAVE >. H e r e i n a R e r , a Speedlite 550EX set to this mode will be called a "slave." The zoom setting is set automatically to (a c7'lmm. T h i s can be overridden manually. 2 Set the slave's main switch to < I> or < SE > to turn it on. When the Speedlite is ready to fire, the AF-assist beam emitter blinks conli~>uouslayt 1 Hz. Each time you press the < SEL/SET > button, the blink- ing display changes in the fol- - lowing loop: +m+------ l i g h t s , 2 + While is blinking, press the < z or < - > butlon to select the same channel No. as the ST-E2's. 0 If t h e 550EX's channel No. is different from the ST-E2's channel No., wireless t r a n smission will not work.