Keysight Technologies InfiniiVision 4000 X Series Programmer's Manual page 91

Keysight InfiniiVision 4000 X-Series Oscilloscopes
Programmer's Guide
4 Sequential (Blocking) vs.
Overlapped Commands
IEEE 488.2 makes the distinction between sequential and overlapped commands
(and queries):
• Sequential commands also known as blocking commands, finish their task
• Overlapped commands run concurrently. Commands following an overlapped
With sequential (blocking) commands and queries, the oscilloscope is expected to
stop processing inputs, including additional remote commands and queries as
well as front panel knobs, until completed.
Pausing Execution With overlapped commands, you can use the *OPC? query to prevent any more
Between commands from being executed until the overlapped command is complete. This
Overlapped may be necessary when a command that follows an overlapped command
Commands interferes with the overlapped command's processing or analysis. For example:
:RECall:SETup "setup.scp";*OPC?;:RECall:ARBitrary "arb_wfm.csv"
You can also use the *ESR? query to look at the OPC bit (bit 0) in the Standard
Event Status Register to determine when an operation is complete.
before the execution of the next command starts.
These oscilloscope commands and queries are sequential (blocking):
• :AUToscale
• :DIGitize
• :WMEMory<r>:SAVE <source>
• :WAVeform:DATA?
command may be started before the overlapped command is completed.
Some oscilloscope commands are overlapped. For example, the oscilloscope's
save and recall commands are overlapped as well as some commands that
perform analysis.
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