Remote Interface Reference 4
Keysight 34420A User’s Guide 199
Using “ ? ” Commands The bus controller may send commands at any time,
but a SCPI instrument may only send responses when specifically instructed to do
so. Only query commands (commands that end with a “?”) will instruct the
instrument to send a response message. Queries return either measured values or
internal instrument settings.
Using “ * ” Commands Commands starting with a “ * ” are called common
commands. They are required to perform the identical function for all instruments
that are compliant with the IEEE-488.2 interface standard. The “ * ” commands are
used to control reset, self-test, and status operations in the meter.
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.
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