SCPI Introduction
Copyright © ITECH Electronic Co., Ltd. 7
Comma (,)
If a command requires several Parameter, then a comma must be used to
separate adjacent Parameter.
Space
You must use blank characters, [TAB] or [Space] to separate Parameter with key
words of commands.
Common commands (*)
The IEEE-488.2 standard defines a set of common commands that perform
functions such as reset, self-test, and status operations. Common commands
always start with a asterisk (*) and occupy 3 character sizes, including one or
more Parameter. Key words of a command and the first parameter are separated
by a space. Semicolon (;) can separate several commands as follows:
*RST; *CLS; *ESE 32; *OPC?
Command terminator
Command strings sent to the instrument must end with a <Newline> (<NL>)
character. IEEE-488 EOI (End or Identify) information can be used as <NL>
character to replace termination command string of <NL> character. It is
acceptable to place one <NL> after a <Enter>. Termination of command string
always resets current SCPI command path to root level.
NOTE
As for every SCPI message with one query sent to the instrument, the
instrument will use a <NL> or newline sign (EOI) to terminate response of
return. For Example, if "DISP:TEXT?" is sent, <NL> will be placed after the
returned data string to terminate response. If an SCPI message includes
several queries separated by semicolon (such as "DISP?;DISP:TEXT?"),
<NL> will terminate response returned after response to the last query. In
all cases, the program must read <NL> in response before another
command is sent to the instrument, otherwise errors will be caused.
1.6 Data Type
SCPI language defines several data types used for program message and
response messages.
⚫ Numerical parameter
Commands requiring numerical parameter support the notations of all
common decimal notations, including optional signs, decimal points, scientific
notation, etc. Special values of numerical parameter are also acceptable,
such as MIN, MAX and DEF. In addition, suffixes for engineering units can
also be sent together with numerical parameter (including M, k, m or u). If the
command accepts only some specific values, the instrument will
automatically round the input parameter to acceptable values. The following
commands require numerical parameter of frequency value:
[SOURce[1|2]:]FREQuency:CENTer {<Frequency>|MINimum|MAXimum}
– <NR1>: represents an integer value, such as 273;
– <NR2>: represents a real number in floating-point format, such as .273;
– <NR3>: represents a real number in scientific notation, such as 2.73E+2;
– <Nrf>: The extensible form includes <NR1>, <NR2> and <NR3>;
– <Nrf+>: The extensible decimal form includes <Nrf>, MIN, MAX and DEF.
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