B&K Precision 4045B - Manual - Manual (Page 74)

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will return the maximum value to which the
frequency may currently be set.
Not all Program Message units have query forms (for
example, SAV), and some Program Message Units might
have only the query form (for example IDN?).
The instrument puts the response to the query into the
output queue, from where it may be read by the controller.
NOTE: All commands should be terminated with a
<CR> carriage return or <LF> line feed character. Any
response string from a query command has both
<CR> and <LF> characters appended. For example,
an amplitude query command will return
1.23<CR><LF>.
4.7 Status Reporting
The instrument is capable of reporting status events and
errors to the controller.
4.7.1 The Error Queue
The error queue is used to store codes of errors detected
in the device. It is implemented as a cyclic buffer of length
10. The error queue is read with the following query:
ERR?