Command Groups
Table 2-30: Status and Error Commands (cont.)
Command
Description
EVMsg? Returns event code, message from the event
queue
EVQty? Return number of events in the event queue
*OPC Generates the operation complete message
in the standard event status register when all
pending operations are finished
Or returns "1" when all current operations
are finished
*PSC Sets or returns the power on status flag
*PUD Sets or returns a string of protected user data
*RST Resets the oscilloscope to factory default
settings
*SRE Sets or returns the bits in the Service
Request Enable Register
*STB? Returns the contents of the Status By te
Register
*WAI Prevents the oscilloscope from executing
further commands until all pending
operations finish
Trigger Command G roup
Use the commands in the Trigger Command Group to control all aspects of
triggering for the oscilloscope.
There are two triggers: A and B. Where appropriate, this command set has parallel
construction between triggers.
You c an set the A or B triggers to edge mode. Edge triggering lets you display
a waveform at or near the point where the signal passes through a voltage level
of your choosing.
You can also set A triggers to pulse, logic
, or video modes. With pulse triggering,
the oscilloscope triggers whenever it detects a pulse of a certain width or height.
Logic triggering lets you logically combine the signals on one or channels. The
oscilloscope then triggers when it detects a certain combination of signal levels.
Video triggering e nables you to trigger on the most c ommon Standard Definition
video standards.
Table 2-31: Trigger Commands
Command
Description
TRIGger
Forces a trigger event to
occur
2-48 MSO4000 and DPO4000 Series Programmer Manual
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