SCPI Introduction
Copyright © Itech Electronic Co., Ltd. 18
VOLTage 20<NL>
2.3.2 Headers
Headers, also referred to as keywords, are instructions recognized by the
electronic load. Headers may be either in the long form or the short form. In the
long form, the header is completely spelled out, such as VOLTAGE, STATUS,
and DELAY. In the short form, the header has only the first three or four letters,
such as VOLT, STAT, and DEL.
2.3.4 Query Indicator
Following a header with a question mark turns it into a query (VOLTage?,
VOLTage:PROTection?). If a query contains a parameter, place the query
indicator at the end of the last header(VOLTage:PROTection? MAX).
2.3.5 Message Unit Separator
When two or more message units are combined into a compound message,
separate the units with a semicolon (STATus:OPERation?;QUEStionable?).
2.3.6 Root Specifier
When it precedes the first header of a message unit, the colon becomes the
root specifier. It tells the command parser that this is the root or the top node of
the command tree.
2.3.7 Message Terminator
A terminator informs SCPI that it has reached the end of a message. Three
permitted messages terminators are:
newline (<NL>), which is ASCII decimal 10 or hex 0A.
end or identify (<END>)
both of the above (<NL><END>).
In the examples of this guide, there is an assumed message terminator at the
end of each message.
2.3.8 Command execution rules
Commands execute in the order that they are presented in the program
message.
An invalid command generates an error and, of course, is not executed.
To Next Page
Loading...
Need help?
General
