Agilent Technologies Infiniium 8000A Programmer's Reference Manual page 724

This command sets the conditions for the EDGE slope and source trigger
commands.
To query the oscilloscope for the trigger mode, enter:
:TRIGger:MODE?
You set up the :TRIGger:EDGE commands with the following commands
and queries:
• COUPling
• SLOPe
• SOURce
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