Query Errors (these errors set Standard Event Status register bit #2)
-400 Query Error
Generic error query
-410 Query INTERRUPTED
A condition causing an interrupted query error occurred.
-420 Query UNTERMINATED
A condition causing an unterminated query error occurred.
-430 Query DEADLOCKED
A condition causing a deadlocked query error occurred.
-440 Query UNTERMINATED after indefinite response
A query was received in the same program message after a query indicating an indefinite response
was executed.
6 SCPI Programming Reference
303 Keysight N6900/N7900 Series Operating and Service Guide