Introduction to Programming 5
Series N6700 User’s Guide 71
The Message Unit
The simplest SCPI command is a single message unit consisting of a
command header (or keyword) followed by a message terminator
such as a newline. The message unit may include a parameter after
the header. The parameter can be numeric or a string.
*RST<NL>
VOLTage 20,(@1)<NL>
Channel List Parameter
The channel parameter is required to address one or more channels.
It has the following syntax:
(@<channel> [,<channel>][,<channel>][,<channel>])
You can also specify a range of sequential channels as follows:
<start_channel>:<end_channel>
For example, (@2) specifies channel 2 and (@1:3) specifies channels 1
through 3. A maximum of 4 channels may be specified through a
combination of single channels and ranges. Query results are channel
list order-sensitive. Results are returned in the order they are
specified in the list.
NOTE
When adding a channel list parameter to a query, you must include a space
character between the query indicator (?) and the channel list parameter.
Otherwise error –103, Invalid separator will occur.
Headers
Headers, also referred to as keywords, are instructions recognized by
the power system. Headers may be in the long form or in 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.
When the long form notation is used in this document, the capital
letters indicate the equivalent short form. For example, MEASure is
the long form, and MEAS indicates the short form equivalent.
Query Indicator
Following a header with a question mark turns it into a query
(VOLTage?, VOLTage:TRIGgered?). The ? is the query indicator. If a
query contains a parameter, place the query indicator at the end of
the last header, before the parameter.
VOLTage:TRIGgered? MAX,(@1)
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