Source - Agilent Technologies 16533A 1-GSa/s Programmer's Manual

The SLOPe query returns the slope of the current trigger source.
Returned Format
[:TRIGger:SLOPe] {POSitive|NEGative}<NL>
Example
OUTPUT XXX;":TRIG:SOUR CHAN1;SLOP?"

SOURce

Command :TRIGger:[MODE EDGE;]SOURce {CHANnel<N>|EXTernal}
The SOURce command is used to select the trigger source and is used for any
subsequent SLOPe and LEVel commands. This command can only be used in
the EDGE trigger mode. It is the equivalent to the PATH command for the
PATTern trigger mode.
<N> 1 or 2
Example
OUTPUT XXX;":TRIG:SOUR CHAN1"
Query :TRIGger:SOURce?
The SOURce query returns the current trigger source.
Returned Format
[:TRIGger:SOURce] {CHANnel<N>|EXTernal}<NL>
Example
OUTPUT XXX;":TRIGGER:SOURCE?"
TRIGger Subsystem
SOURce
9–13