An <error/event number> in the range [ -399 , -
300 ] or [ 1 , 32767 ] indicates that the instrument
has detected an error which is not a command
error, a query error, or an execution error; some
device operations did not properly complete,
possibly due to an abnormal hardware or
firmware condition. These codes are also used for
self-test response errors. The occurrence of any
error in this class should cause the device-specific
error bit (bit 3) in the event status register (IEEE
488.2, section 11.5.1) to be set. The meaning of
positive error codes is device-dependent and may
be enumerated or bit mapped; the <error
message>string for positive error codes is not
defined by SCPI and available to the device
designer.
Note that the string is not optional; if the designer
does not wish to implement a string for a
particular error, the null string should be sent (for
example, 42,""). The occurrence of any error in this
class should cause the device-specific error bit (bit
3) in the event status register (IEEE 488.2, section
11.5.1) to be set. Events that generate device-
specific errors shall not generate command errors,
execution errors, or query errors; see the other
error definitions in this section.
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