EXFO FLS-2200, User Manual

Page: 56 / 185

Using Your Broadband Source in an Automated Test Environment
Broadband Source
47
SCPI Command Structure
There are also several conventions regarding command syntax:

Spelling errors will cancel the command or query.

Commands and queries are not case-sensitive. You can type your
program messages using either lower-case or upper-case letters.

The command or query can be written using only the three- or
four-letter shortcuts, only full words, or a combination of both.
The example below shows the long and the short forms of a same
query.

For readability reasons, you can use extra spaces in your program
messages but they won’t be taken into account. For more information,
see
Message Management on page 35.
;

Mandatory to separate the different commands of a program
message when more than one command is sent at a time. In this
case, it is called
<PROGRAM MESSAGE UNIT SEPARATOR>.

Also used to separate responses when multiple queries were sent in
a single program message. In this case, it is called
<RESPONSE
MESSAGE UNIT SEPARATOR>.
,

Mandatory to separate parameters in a command or a query. In this
case, it is called
<PROGRAM DATA SEPARATOR>.

Also used to separate the various responses from a query. In this
case, it is called
<RESPONSE DATA SEPARATOR>.
Item Meaning
:SYSTem:ERRor?
:SYST:ERR?
:syst:err?
Long form
Short form (small words
represented by the capital letters
of the long form)