Basic Definition - Chroma 63800 Series Operation & Programming Manual

<CRD> Character Response Data: character string with maximum length of 12.
<SRD> String Response Data: character string.

8.3.5 Basic Definition

Command Tree Table:
The commands of the AC Load are based on a hierarchical structure, also known as a tree
system. In order to obtain a particular command, the full path to that command must be
specified. This path is represented in the table by placing the highest node in the farthest left
position of the hierarchy. Lower nodes in the hierarchy are indented in the position to the right,
below the parent node.
Program Headers:
Program headers are key words that identify the command. They follow the syntax described
in subsection 8.6 of IEEE 488.2. The AC Load accepts characters in both upper and lower
case without distinguishing the difference. Program headers consist of two distinctive types,
common command headers and instrument-controlled headers.
Common Command and Query Headers:
The syntax of common command and query headers is described in IEEE 488.2. It is used
together with the IEEE 488.2-defined common commands and queries. The commands with a
leading " * " are common commands.
Instrument-Controlled Headers:
Instrument-controlled headers are used for all other instrument commands. Each of them has
a long form and a short form. The AC Load only accepts the exact short and long forms. A
special notation will be taken to differentiate the short form header from the long one of the
same header in this subsection. The short form of the header are shown in characters of
upper case, whereas the rest of the header are shown in those of lower case.
Program Header Separator (:):
If a command has more than one header, the user must separate them with a colon
( FETC:CURR? or VOLT:DC 10 ). Data must be separated from program header by one
space at least.
Program Message:
Program message consists of a sequence of zero or more elements of program message unit
that is separated by separator elements of program message unit.
Program Message Unit:
Program message unit represents a single command, programming data, or query.
Example : CURR? or LOAD ON.
Program Message Unit Separator ( ; ):
Remote Operation
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