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CMS-XML QuickGuide to Speedlite 600EX-RT Radio Wireless Flash Setup
i. Press Fn Button 4 to return the flash to shoot-ready mode. j. The <LINK> lamp should light green to indicate a working link between the sender and receiver, assuming both are turned on and set to same Channel/ID.
CMS-XML QuickGuide to Speedlite 600EX-RT Optical Wireless Flash Setup
For this system to work you must first set the senderand receivers to matching transmission channels. Once you have done so, any settings you make to the senderare automatically transmitted to the receivers. This eliminates the need to adjust the receivers individually and manually.