SCPI Introduction
Copyright © ITECH Electronic Co., Ltd. 7
Question mark (?)
You can insert question marks into a command to query current values of most
Parameter. For example, the following commands will trigger to set the count as
10:
TRIG:COUN 10
Then, you may query count value by sending the following command:
TRIG:COUN?
You may also query the allowable minimum or maximum count as follows:
TRIG:COUN?MIN
TRIG:COUN?MAX
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.
âš« Numerical parameter
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