BNC 7000 Series Programmer Manual - Manual (Page 17)

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Units In the case of physical quantities, the unit can be entered. Permissible unit prefixes are G (giga),
MA (mega), MHZ are also permissible), K (kilo), M (milli), U (micro) and N (nano). If the unit is missing,
the basic unit is used.
Boolean Parameters Boolean parameters represent two states. The ON state (logically true) is
represented by ON or a numerical value unequal to 0. The OFF state (logically false) is represented by
OFF or the numerical value 0. ON or OFF is returned by a query.
4.4 Hierarchical Command Structure
All SCPI commands, except the common commands, are organized in a hierarchical structure similar
to the inverted tree file structure used in most computers. The SCPI standard refers to this structure as
“the Command Tree.” The command keywords that correspond to the major instrument control
functions are located at the top of the command tree. The command keywords for the SERIES 7000
SCPI command set are shown below.
:ABORt
:CALCulate
The purpose of the CALCulate block is to convert or derive sensed data into a form more useful to the
application. Typical calculations include converting units, and postprocessing calculations (for
example, calculation of jitter of a phase noise trace). The CALCulate commands are described in the
CALCulate subsystem.
:DIAGnostic
:INPut
The purpose of the INPut block is to condition the incoming signal before it is converted intodata by
the SENSe block. INPut block functions include filtering, biasing, frequency conversion (such as a
mixer or prescaler function), and attenuation. The INPut block appears in the SCPI tree under the
INPut subsystem. The implementation of this subsystem is optional for those instruments that have no
INPut block characteristics.
:INITiate
:SENSe
The purpose of the SENSe block is to convert signal(s) into internal data that can be
manipulated by normal computer techniques. The commands associated with the SENSe
block control the various characteristics of the conversion process. Examples are range,
resolution, gate time, normal mode rejection, etc. This block does not include any
mathematical manipulation of the data after it has been converted
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