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Programming
General Information
Command headers immediately followed by a question mark (?) are queries.
Query commands are used to find out information regarding the instrument's
current state. After receiving a query, the instrument interrogates the
requested function and places the answer in its output queue. The answer
remains in the output queue until it is read or another command is issued.
When read, the answer is transmitted across the bus to the designated listener
(typically a controller).
The output queue must be read before the next program message is sent. For
example, when you send the query :SYSTEM:CONFIG? you must follow that
query with an input statement. In HP BASIC, this is usually done with an
ENTER statement immediately followed by a variable name. This statement
reads the result of the query and places the result in a specified variable.
4-5
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