Indicates that some error, termed “system error”
by the device, has occurred. This code is device-
dependent.
Indicates that the firmware detected a fault when
using data storage. This error is not an indication
of physical damage or failure of any mass storage
element.
An <error/event number> in the range [ -499 , -
400 ] indicates that the output queue control of the
instrument has detected a problem with the
message exchange protocol described in IEEE
488.2, chapter 6. The occurrence of any error in this
class shall cause the query error bit (bit 2) in the
event status register (IEEE 488.2, section 11.5.1) to
be set. These errors correspond to message
exchange protocol errors described in IEEE 488.2,
section 6.5. One of the following is true:
An attempt is being made to read data from the
output queue when no output is either present
or pending;
Data in the output queue has been lost.
Events that generate query errors shall not
generate command errors, execution errors, or
device-specific errors; see the other error
definitions in this section.
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