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CMS-XML QuickGuide to Speedlite 600EX-RT Custom and Personal Settings
When set to 0 the flash will automatically “go to sleep” after 90 seconds of inactivity. It does this to conserve battery power. You can “wake” the flash by tapping your camera’s shutter button or the test flash button on the flash.
CMS-XML QuickGuide to Speedlite 600EX-RT Optical Wireless Flash Setup
5. If a receiver enters sleep mode, press the senderunit’s test flash button to turn the receiver back on. Receiver units, by default, stay active for 60 minutes before going to sleep mode. You can use Flash C.Fn 10-1 to change this to 10 minutes to conserve receiver unit battery power.