Specifications

8-14
SCPI Messages
Query Errors [-499, -400]
Query Errors [-499, -400]
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 should 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.
-400 Query error
This is the general query error for devices that cannot detect more specific errors. This
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, 6.3.2.3); for example, a query 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 input buffer and output buffer are full and the device
cannot continue.
-440 Query UNTERMINATED after indefinite response
Indicates that a query was received in the same program message after a query requesting
an indefinite response was executed (see IEEE 488.2, 6.5.7.5.7.)