:INITiate[:IMMediate]
When the trigger system is in the idle state, issuing this command activates the trigger system. The trigger system returns to the idle state after completing one trigger cycle. When the trigger system is not in the idle state or configured to be continuously activated (i.e., after you have issued the :INIT:CONT command by specifying “ON”), issuing this command generates an error. For more information on the trigger system, see Trigger system. (No query)
No equivalent key is available on the front panel.