BNC 645 - Manual (Page 108)

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7.4 Query Errors
-410 Query INTERRUPTED
A command was received, but the output buffer contained data from
a previous command (the previous data is lost).
-420 Query UNTERMINATED
A query command was sent to read the output buffer over the
interface, but no such command that generates data to the output
buffer was previously sent for execution.
-430 Query DEADLOCKED
An executed command generated too much data for the output buffer
and the input buffer is also full. The command continues to execute
but the data is lost.
-440 Query UNTERMINATED after indefinite response
The *IDN? command must be the last query command within a series
of commands in a command string.
7.5 Instrument Errors
501 Cross-isolation UART framing error
502 Cross-isolation UART overrun error
Internal hardware failure.
580 Reference phase-locked loop is unlocked
The PHAS:UNL:ERR:STAT has been turned on and the internal
phase-locked loop is currently unlocked.
7.6 Self-Test Errors
621 Self-test failed; square-wave threshold DAC
A possible malfunctioning DAC, failed DAC multiplexer (U803) channels,