The sender unit's flash firing can be enabled (ON) or disabled (OFF)
![](/library/attachments/ServiceWareImages/LDImages/SolutionAnswer/550EX Speedlite/on.jpg) |
This setting enables the sender unit to fire a flash
- This setting is called "sender Flash ON"
- This setting automatically sets the sender unit's receiver ID to A
|
![](/library/attachments/ServiceWareImages/LDImages/SolutionAnswer/550EX Speedlite/off.jpg) |
This setting (sender Flash OFF) prevents the sender unit from firing a flash. It can still transmit wireless signals to trigger the receiver units |
![](/library/attachments/ServiceWareImages/LDImages/SolutionAnswer/550EX Speedlite/master off.jpg) |
Press the <SEL/SET> button and select
- Pressing the <SEL/SET> button changes the selection in the following loop
![](/library/attachments/ServiceWareImages/LDImages/SolutionAnswer/550EX Speedlite/comm setting sequence.jpg)
|
Press the <+> or <-> button to set either ON or OFF
Press the <SEL/SET> button
or will appear
- If sender flash OFF is set will blink
|
- Even if you disable the sender unit's flash firing, it will still fire a preflash to transmit wireless signals