Keysight EL30000 Serie Guide D'utilisation page 72

[All On/Off] will turn ALL inputs on or off, whether they are configured to participate in an input on/off delay
sequence or not.
From the remote interface:
To program turn-on and turn-off delays for inputs 1 and 2:
INP:DEL:RISE 0.01, (@1)
INP:DEL:RISE 0.02, (@2)
INP:DEL:FALL 0.04, (@1)
INP:DEL:FALL 0.03, (@2)
To only include inputs 1 and 2 in a sequence:
INP:COUP:CHAN CH1,CH2
To turn on two coupled inputs in a sequence:
INP ON (@1:2)
72 Keysight EL30000 Series User's Guide