Technical data

818 Agilent InfiniiVision 6000 Series Oscilloscopes Programmer's Guide
11 More About Oscilloscope Commands
:CHANnel1 and :TIMebase are subsystem selectors and determine which
range is being modified.
Tree Traversal Rules and Multiple Commands
Command headers are created by traversing down the Command Tree (see
page 803). A legal command header would be :TIMebase:RANGe. This is
referred to as 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 (<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
lets you access that subsystem until a leading colon or a program
message terminator (<NL>) or EOI true is found.
• In the command tree, use the last mnemonic in the compound header
as the reference point (for example, RANGe). Then find the last colon
above that mnemonic (TIMebase:). 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 which appear above
them (for example, POSition).
The output statements in the examples are written using the Agilent VISA
COM library in Visual Basic. The quoted string is placed on the bus,
followed by a carriage return and linefeed (CRLF).
To execute more than one function within the same subsystem, separate
the functions with a semicolon (;):
:<subsystem>:<function><separator><data>;<function><separator><data><ter
minator>
For example:
myScope.WriteString ":TIMebase:RANGe 0.5;POSition 0"
NOTE
The colon between TIMebase and RANGe is necessary because TIMebase:RANGe is a
compound command. The semicolon between the RANGe command and the POSition
command is the required program message unit separator. The POSition command does not
need TIMebase preceding it because the TIMebase:RANGe command sets the parser to the
TIMebase node in the tree.