Command Syntax
Queries
Queries cause t
he instrument to return status or setting information. Queries
have the structure:
[:]<Header>?
[:]<Header>?[<Sp
ace><Argumen
t>
[<Coma><Argumen
t>]...]
You can specify a query command at any level within the command tree unless
otherwise noted. These branch queries return information about all the mnemonics
below the sp
ecified branch or level. For example, HIStogram:STATistics:STDdev?
returns the standard deviation of the histogram, while HIStogram:STATistics?
returns all the histogram statistics, and HIStogram? returns all the histogram
parameters.
Headers
You can control whether the instrument re turns headers as part of the query
response. Use the HEADer command to control this feature. If hea der is on,
the query response returns command headers, then formats itself as a valid set
command. When header is off, the response includes only the values. This may
make it easier to parse and extract the informa tion from the response. The
follo
wing table shows the difference in responses.
Table 2-3: Comparison of Header Off and Header On Responses
Query Header Off Header On
TIME?
”14:30:00” :TIME”14:30:00”
ACQuire:NUMAVg?
100
:ACQUIRE:NUMAVG 100
Clearing the Instrument
You can clear the Output Queue and reset the instrument to accept a new
command or query by using the selected Device Clear (DCL) GPIB function.
Refer to your GPIB library documentation for further details about the selected
Device Clear operation.
DPO7000, DPO70000/B and DSA7000/B Series Programmer Manual 2-3
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