Ceyear 1465 Series, Programming Manual

Page: 16 / 143

2 Remote Control
2.1 Remote control basis
9
recognize as they all begin with an asterisk. For example, *IDN? , *OPC and *RST are common
commands. Common commands don‘t belong to any instrument-specific command. The instrument
uses the same method to interpret them without consideration to the current path setting.
It is very easy to identify instrument-specific commands because they contain a colon (:). Colons are
used between the beginning of command expression and keywords, e.g.: FREQuency[:CW
？
].
Instrument-specific commands are divided into command subsets of corresponding subsystem
according to the functional block inside the instrument. For example, the power subsystem (:POWer)
contains the power-related command while the status subsystem (:STATus) contains the command for
the status control register.
Figure 2.1 SCPI Type
3) Instrument-specific command syntax
A typical command consists of keywords with colon as prefix. These keywords are followed by
parameters. An example of syntax statement is shown below.
[:SOURce]:POWer[:LEVel] MAXimum|MINimum
In the above example, the [:LEVel] portion of the command immediately follows :POWer with no
separating space. The portion following [:LEVel] is MINimum|MAXimum that is a parameter. There is a
space between the command and the parameter. The description of other parts of the syntax expression
is as shown in Table 2.2 and Table 2.3.
Table 2.2 Special Characters in Command Syntax
Symbol Meaning Example
|
The vertical line between the keyword and the
parameter represents a variety of options.
[:SOURce]:AM:SOURce
EXTernal|INTernal
EXTernal
和
INTernal alternative
choices
[]
Keywords or parameters in square brackets are
optional
when they form a command. These implied
keywords or parameters are executed
even when they are ignored.
[:SOURce]:AM[:DEPTh]:EXPonential?
SOURce and DEPTh are dispensable.
< >
The part inside the angle brackets can't be used
literally
in the command, instead, it represents the part that
must be contained.
[:SOURce]:FREQ:STOP <val>
In this command, <val>must be
replaced by an actual frequency and
unit.
For example: :FREQ:STOP 3.5GHz
{ }
The part inside the braces indicates that the
parameter is optional. [:SOURce]:LIST:POWer
<val>{,<val>}
SCPI
Common
command
Special
command