The sender and receiver units must be set to same ID number . The number you set must be different from that of any other 600EX-RT shooter in the vicinity.
You can enter any number from 0000 – 9999. The sender and receiver units must be set to same ID number . The number you set must be different from that of any other 600EX-RT shooter in the vicinity.
3. Press the Zoom button again until the "SLAVE" and ID number blink. Use the + or – buttons to dial-in group A, B or C. Press the Speedlite SET button to complete.
As shown in the figure below, the wireless E-TTL autoflash system described as an example consists of a sender unit set to sender flash OFF and two receiver units. The receiver ID of the receiver unit on the camera's left is A The receiver ID of the receiver unit on the camera's right is B
The example below has two receiver units and the sender unit disabled from firing. Setting the receiver Units Two receiver units can be assigned to different receiver groups by setting a receiver ID .