B&K Precision 4045B - Manual - Manual (Page 73)

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For example, to set the frequency to its maximum
value we can send the command
FREQ MAX
Some Program Message Units either require, or can
accept, more than one data element. Program data
elements are separated from each other by the Program
Data Separator. It is defined as optional white space
characters followed by a comma (','), which in turn is
followed by optional white space characters.
There are two types of Program Message Units:
Command Message Units and Query Message Units. A
Query differs from a Command in that the Program
Header is terminated with a question mark ('?'). For
example, the frequency might be queried with the
following query:
FREQ?
Some Query Message Units accept data, giving the device
more specific information about what is being queried. In
many cases the Query Message Unit may optionally be
supplied with the MIN or MAX mnemonics as data. This
tells the device to return the minimum or maximum value
to which the parameter may currently be set. For example,
FREQ? MAX