Tektronix KEITHLEY 2200 Series, Programming Reference Manual

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Command Syntax
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 speci
fi ed branch or level.
Query Responses When a query is sent to the power supply, only the values are returned. When
the returned value is a mnemonic, it is noted in abbreviated format, as shown
in the following table.
Table 2-3: Query response examples
Query Response
MEASure:VOLTage:DC?
5.0011
SOURce:FUNCtion:MODE?
LIST
Command Entry
Follow these general rules when entering commands:
Enter commands in upper or lower case.
You can precede any command with white space characters. White space
characters include any combination of the ASCII control characters 00 through
09 and 0B through 20 hexadecimal (0 through 9 and 11 through 32 decimal).
The power supply ignores commands that consists of just a combination of
white space characters and line feeds.
SCPI Commands and
Queries
The power supply uses a command language based on the SCPI standard. The
SCPI (Standard Commands for Programmable Instruments) standard was created
by a consortium to provide guidelines for remote programming of instruments.
These guidelines provide a consistent programming environment for instrument
control and data transfer. This environment uses de
fi ned programming messages,
instrument responses and data formats that operate across all SCPI instruments,
regardless of manufacturer.
The SCPI language is based on a hierarchical or tree structure that represents a
subsystem. The top level of the tree is the root node; it is followed by one or more
lower-level nodes. (See Figure 2-2.)
Figure 2-2: Example of SCPI subsystem hierarchy tree
Series 2200 Programmable Multichannel DC Power Supplies Programmer Manual 2-3