Keysight Technologies E36300 Série Guide D'utilisation page 76

Operation
Once configured and enabled, turning the output on or off on any coupled output will cause all coupled outputs on
all configured power supplies to turn on or off according to their user-programmed delays. This applies to the front
panel On and Off keys, the Web server, and to SCPI commands.
Turning the outputs on or off using the front panel [All On/Off] key will cause all coupled outputs as well as non-
coupled outputs on that power supply to turn on or off.
76 Keysight E36300 Series User's Guide