Chroma 6404 - Character Data Format; Basic Definition

Remote Operation
6-3
6.3.4 Character Data Format
The character strings returned by query command may take either of the following forms:
<CRD> Character Response Data: character string with maximum length of 12.
<SRD> String Response Data: character string enclosed in double quotes.
6.3.5 Basic Definition
Command Tree Table:
The ac source commands are based on a hierarchical structure, also known as a tree system.
To obtain a particular command, the full path to it must be specified. This path is represented
in the tables by placing the highest node in the hierarchy in the left-most position. Lower
nodes in the hierarchy are indented on position to the right, below the parent node.
Program Headers:
Program headers are keywords that identify the command. The program headers follow the
syntax described in section of IEEE 488.2. The ac source accepts both upper and
lowercase characters without distinguishing between the cases. Program headers consist of
two distinct types, common command headers and instrument-control headers.
Common Command and Query Headers:
The common command and query program header syntax is specified in IEEE 488.2 for
use with the IEEE 488.2-defined common commands and queries. The commands with a
leading "*" are common commands.
Instrument-Control Headers:
Instrument-control headers are used for all other instrument commands. Each instrument-
control header has both a long and a short forms. The ac source accepts only the exact
short and the exact long forms. Note that elsewhere in this section a special notation is
employed to differentiate the short form header from the long form header of the same
header. The long form of the header is shown, with the short form portion shown in
uppercase characters, and the rest of the header is shown in lowercase characters.
Program Header Separator:
Data must be separated from program header by at least one space.
Program Message:
Represents a sequence of zero or more program message unit elements separated by
program message unit separator elements.
Program Message Unit:
Represents a single command, programming data, or query.
Examples: VOLT?, OUTPut ON.
Program Message Unit Separator (';'):
Separates the program message unit elements from one another in a program message.
Example: VOLT 110 ; FREQ 120 <PMT>
Program Message Terminator (<PMT>):