Scientific SM6015A, Руководство пользователя

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Scientific
SM6015A 34/44
Common Command
The IEEE 488 standard defines the common commands for general use in all kinds
of instrument. Common commands usually come with the asterisk “*” character, and
may include parameters. Some examples of Common command like: *IDN?, *GTL,
*LLO. SM6015A support a few common commands. See the following command
descriptions for more details.
Termination Character
A terminator is a character sent by a host, which identifies the end of a command
string. Only when a termination character is received, the instrument will analyze and
deal with command character string. Terminators can be any one of the following
character strings:
<CR> (Carriage Return
，
ASC(&H0D)) ;
<LF> (Line Feed
，
ASC(&H0A));
<CR><LF>
Returned Result
After the meter executes a query command, the return of the result will be in the
following format:
<Result> + <CR> <LF>
CR is Carriage Return and LF, Line Feed.
For example, in inquiring measured results (FETCH?), the format of the printed data
will be shown as the following:
<Primary measured data, Secondary measured data, Tolerance Result>
<CR> <LF>
Data Types
Table 5 below explains the different data types transmitted on bus with ASCII
characters:
Table 5 – Data Type
Data Type Explanation Example
<NR1> Integer +800,-200,100,-50
<NR2> Integer +1.56,-0.001,10.5
<NR3>
This representation has an
explicit radix point and an
exponent
+2.04
-1.345678E-01
<Boolean>
A parameter for Boolean setting.
Always return “0” or “1” for
Boolean query command
ON or OFF
<Literal>
A string is used as command
parameters with short literal form
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