11: Introduction to SCPI commands 2470 High Voltage SourceMeter Instrument
11-4 2470-901-01 Rev. A / May 2019
Queries
SCPI queries have a question mark (?) after the command. You can use the query to determine the
pr
esent value of the parameters of the command or to get information from the instrument.
For example, to determine what the present setting for NPLC is, you can send:
:SENSe1:RESistance:NPLCycles?
This query returns the present setting.
If the command has MINimum, MAXimum, and DEFault options, you can use the query command t
o
det
ermine what the minimum, maximum, and default values are. In these queries, the ? is plac
ed
before the MINimum, MAXimum, or DEFault parameter. For example, to determine the default value
f
or NPLC, you can send:
:SENSe1:RESistance:NPLCycles? DEFault
If you send two query commands without reading the response from the first, and then attempt to
read the second response, you may receive some data from the first response followed by the
complete second response. To avoid this, do not send a query command without reading the
response. When you cannot avoid this situation, send a device clear before sending the second query
command.
When you query a Boolean option, the instrument returns a 0 or 1, even if you sent OFF or ON when
y
ou originally sent the command.
SCPI parameters
The parameters of the SCPI commands are shown in angle brackets (< >). For example:
:SYSTem:BEEPer[:IMMediate] <frequency>, <duration>
The type of information that you can use to replace <frequency> and <duration> is defined in the
U
sage section of the command description. For this example, the Usage is:
The frequency of the beep (20 Hz to 8000 Hz)
The amount of time to play the tone (0.001 s to 100 s)
For this example, you can generate an audible sound by sending:
:SYSTem:BEEPer 500, 1
Note that you do not include the angle brackets when sending the command.
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