Program Header Separator; Compound Command Program Header - ILX Lightwave OMM-6810B User Manual

<PROGRAM HEADER SEPARATOR>
The <PROGRAM HEADER SEPARATOR> separates the <COMMAND
PROGRAM HEADER> (GPIB command) from the <PROGRAM DATA> (first
parameter after the command). A single white space must be used to separate
the command from the first parameter. Note however, commands may be
compounded as shown later in this section.
<compound command program header>
Some of the 6810B remote commands require a compound structure. This is
done to distinguish between different commands of the same type. The
compound command structure is similar to a directory path structure, as found in
DOS. For example, commands which deal with the 6810B's power display mode
have the path "POWER:", as in the command to set the display to the logarithmic
mode,
"POWER:MODE LOG"
A <compound command program header> is a compound command heading
which may be followed by <program data> (parameters). The device's command
structure is a tree, as shown in Figure 4.2. A compound command or <compound
command program header> determines the proper command by following a path
from the root node. This is similar to determining a path for a file by starting with
the root directory and listing the intermediate subdirectories. The syntax for a
<compound command program header> is shown in Figure 3.5. The syntax
diagram for a <compound query program header> is shown in Figure 3.6.
01_10
G P I B / I E E E 4 8 8 . 2 R E M O T E O P E R A T I O N
program
message unit
Figure 3.4 <PROGRAM MESSAGE UNIT SEPARATOR> Syntax Diagram
<program
:
mnemonic>
Figure 3.5 <compound command program header> Syntax Diagram
ANSI/IEEE-488.2 Definitions
program
;
message unit
<program
:
mnemonic>
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C H A P T E R
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OMM-6810B
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