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Programming and Documentation Conventions
The Command Tree
Subsystem Commands
Subsystem commands are grouped together under a common node of the
command tree, such as the TIMEBASE commands. Only one subsystem may
be selected at any given time. When the instrument is initially turned on, the
command parser is set to the root of the command tree, therefore, no
subsystem is selected.
Tree Traversal Rules
Command headers are created by traversing down the command tree. A legal
command header from the command tree would be :CHANNEL1:RANGE.
This is called a compound header. A compound header is a header made of
two or more mnemonics separated by colons. The mnemonic created
contains no spaces. The following rules apply to traversing the tree:
·
A leading colon or a <program message terminator> (either an <NL> or
EOI true on the last byte) places the parser at the root of the command
tree. A leading colon is a colon that is the first character of a program
header.
·
Executing a subsystem command places you in that subsystem until a
leading colon or a <program message terminator> is found. In the
Command Tree, use the last mnemonic in the compound header as a
reference point (for example, RANGE). Then find the last colon above that
mnemonic (CHANNEL<n>). That is the point where the parser resides.
Any command below that point can be sent within the current program
message without sending the mnemonics that appear above them (for
example, OFFSET).
5–8
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