Setting up your Godox TT685II-O camera flash for wireless flash photography with multiple receivers involves a few key steps. First, ensure the camera flash is properly mounted on your camera and designated as the transmitter unit. Set the flash mode to either M, A, B, or C, corresponding to TTL modes. Next, configure the other TT685II-O flashes as receiver units. Assign each receiver to a different flash group, such as A, B, C, D, or E. It's crucial that both the transmitter and receiver units are set to the same communication channel to avoid interference. Position your camera and flashes as desired, and confirm that the transmitter's ready indicator is illuminated. Test the setup by pressing the test button on the transmitter to check if the receiver units fire. Adjust the angle and distance if necessary. To add more receivers, repeat the setup steps for each additional unit. All flash groups should fire with consistent output for standard exposure. If your Godox TT685II-O flash isn't triggering wirelessly, try these troubleshooting tips: First, check for signal interference. Adjust the channel settings on your flash trigger to avoid interference from other 2.4Ghz devices like Wi-Fi routers or Bluetooth devices. Ensure your flash has finished recycling and is ready to fire, and that it isn't in an overheated state. Verify that the distance between the trigger and flash is greater than 0.5 meters, and confirm both units have sufficient battery power. If needed, activate the close distance wireless mode on the flash trigger. If you're using X2 or X1 series triggers, try pressing and holding the test button while powering on the trigger until the flash ready indicator blinks. For XPro series triggers, set the C.Fn-DIST to 0-30m. Following these steps should help you effectively use your Godox TT685II-O for wireless flash photography.
