B&K Precision 4040B - Manual - Manual (Page 61)

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Data were sent before the entire
response of a previous query was read.
-420 Query UNTERMINATED.
An attempt was made to read a response before the
complete program message meant to generate that
response was sent.
Warnings
The execution of some commands might cause an
undesirable instrument state. The commands are
executed,
but a warning is issued.
500 Trigger rate short
510 Output overload
"Trigger rate short" means that the period of the waveform
is larger than the value of the internal trigger rate. Thus
not every trigger will generate a cycle (or burst) of the
waveform.
4.8 COMMON COMMANDS
4.8.1 System Data Commands
*IDN? - Identification query
The identification query enables unique identification of
the device over the GPIB. This query should always be
the last in a program message. It returns a string with four
fields: