6-22
Error Messages
Query Error
Query Error
An error number in the range [499 to 400] indicates that the output queue control of the instrument has
detected a problem with the message exchange protocol described in IEEE 4888.2, chapter 6. The
occurrence of any error in this class will cause the query error bit (bit 2) to be set 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. If a query error occurs 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 will not generate command errors, execution errors, or device-specific
errors; see the other error definitions in this section.
Query Error Message Descriptions
This section lists the signal generator’s query error messages and their associated descriptions.
Error Number Error Description [description/explanation/examples]
-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 IEE 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.
-430
Query DEADLOCKED
Indicates that a condition causing a DEADLOCKED query error occurred (see IEEE
488.2, 6.3.1.7). For example, both the input buffer and the output buffer are full and the
device cannot continue.
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