4-26 Chapter4
Troubleshooting
–499 to –400: Query Errors
–499 to –400:
Query Errors
The instrument output queue control has detected a problem with the
message exchange protocol described in IEEE 488.2, Chapter 6. Errors
in this class set the query error bit (bit 2) in the event status register
(IEEE 488.2, section 11.5.1). These errors correspond to message
exchange protocol errors described in IEEE 488.2, 6.5.
In this case, either an attempt is being made to read data from the
output queue when no output is either present or pending, or data in
the output queue has been lost.
–430 Query DEADLOCKED
Indicates that a SCPI output queue has filled,
preventing further SCPI command execution, and there
is no more room left in the corresponding SCPI input
queue to accept a query to read from the output queue.
The system automatically discards output to correct the
deadlock.
–400 Query Error
This is a generic query error for devices that cannot
detect more specific errors. The code indicates only that
a query error as defined in IEEE 488.2, 11.5.1.1.7, and
6.3 has occurred.
–410 Query INTERRUPTED
Indicates that a condition causing an INTERRUPTED
query error occurred (see IEEE 488.2, 6.3.2.7). For
example, a query was followed by DAB or GET before a
response was completely sent.
–420 Query UNTERMINATED
Indicates that a condition causing an
UNTERMINATED query error occurred (see IEEE
488.2, 6.3.2.2). For example, the device was addressed
to talk and an incomplete program message was
received.
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