Command Groups
Table 2-39: Search Commands (cont.)
Command Description
SEARCH:SEARCH<x>:TRIGger:A:UPPerthreshold:
RF_FREQuency
For a runt or transition search using the RF Frequency vs. Time
trace, this command specifies the upper threshold to be used by
the search engine.
SEARCH:SEARCH<x>:TRIGger:A:UPPerthreshold:
RF_PHASe
This command specifies the upper threshold to be used by the
search engine when performing a runt or transition search using
the RF Phase vs. Time trace.
Status and Error C om mand Group
Use the commands in the Status and Error Command Group to determine the
status of the oscilloscope and control events.
Several commands and queries used with the oscilloscope are common to all
IEEE488.2 compliant devices. The IEEE Std 488.2-1987 defines these commands
and queries. The common commands begin with an asterisk (*) character.
Table 2-40: Status and E rror Commands
Comma
nd
Description
ALLE
v?
Returns all events and their messages
BUSY
?
Returns oscilloscope status
*CL
S
Cle
ars status
DES
E
Thi
s command specifies the bits in the Device Event Status Enable Register
*E
SE
Th
is command speci fies the bits in the Event Status Enable Register
*
ESR?
R
eturns the contents of the Standard Event Status Register
E
VENT?
R
eturns event code from the event queue
EVMsg? Returns event code, message from the event queue
EVQty? Return number of events in the event queue
*OPC Generates the operation complete m essage in the standard event status register when all
pending operations are finished
Or returns "1" when all current operations are finished
*OPT? Returns a comma-separated list of installed options (not to be confused with
application modules) as an arbitrary ASCII string.
*PSC This command specifies the power on status flag
*PUD This command specifies a string o f protected user data
*RST Resets the oscilloscope to factory default settings
*SRE This command specifies the bits in the S ervice Request Enable Register
*STB? Returns the contents of the Status Byte Register
*WAI Prevents the oscilloscope from executing further commands until all pending operations
finish
MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual 2-75