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Remote Control Basics
Instrument Model and Command Processing
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Strings
Strings must always be entered in inverted commas (’ or ").
Example
ROUTe:SYSTem "3W"
ROUTe:SYSTem ’3W’
Block data
Block data are a transmission format that is suitable for the transmission of large amounts
of data from the instrument to the controller. The block data have the following structure:
Example
#40008xxxxxxxx
The data block is preceded by the ASCII character #. The next number indicates how
many of the following digits describe the length of the data block. In the example, the
four following digits indicate the length to be 8 bytes (skipping the leading zeros). This is
followed by the data bytes. During the transmission of the data bytes, all End or other
control signs are ignored until all bytes are transmitted. Data elements comprising more
than one byte are transmitted with the byte being the first that was specified by the SCPI
command "FORMat:BORDer". Internal structure of the data in the block depends on the
actual instrument configuration.
Overview of Syntax Elements
Following is an overview of syntax elements:
: The colon separates the key words of a command. In a command line the
separating semicolon marks the uppermost command level.
; The semicolon separates two commands of a command line. It does not alter the
path.
, The comma separates several parameters of a command.
? The question mark forms a query.
* The asterix marks a common command.
" Quotation marks introduce a string and terminate it.
# ASCI character # introduces block data.
A "white space" (ASCII-Code 0 to 9, 11 to 32 decimal, blank) separates header
and parameter.
Instrument Model and Command Processing
Figure 1-2 shows the processing of the interface commands. The individual components
work independently of each other and simultaneously. They communicate with each
other by means of messages.