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Error Reporting
The counter will place a detected error in
its Error Queue. This queue is a FIFO
(First-In First-Out) buffer. When you
read the queue, the first error will come
out first, the last error last.
If the queue overflows, an overflow mes
-
sage is placed last in the queue, and fur
-
ther errors are thrown away until there is
room in the queue again.
n
Detecting Errors in the Queue
Bit 2 in the Status Byte Register shows if
the instrument has detected errors. It is
also possible to enable this bit for Service
Request on the GPIB. This can then inter-
rupt the GPIB controller program when
an error occurs.
n Read the Error/Event Queue
This is done with the :SYSTem:ERRor?
query.
Example:
SEND→
:SYSTem:ERRor?
READ←
–100,8“Command8Error”
The query returns the error number fol
-
lowed by the error description.
+
Further description of all error
numbers can be found in the Er
-
ror Messages chapter
If more than one error occurred, the query
will return the error that occurred first.
When you read an error you will also re
-
move it from the queue. You can read the
next error by repeating the query. When
you have read all errors the queue is
empty, and the :SYSTem:ERRor? query
will return:
0, “No error”
When errors occur and you do not read
these errors, the Error Queue may over
-
flow. Then the instrument will overwrite
the last error in the queue with the fol
-
lowing:
–350, “Queue overflow”
If more errors occur, they will be dis
-
carded.
n
Standardized Error Numbers
The instrument reports four classes of
standardized errors in the Standard Event
Status and in the Error/Event Queue as
shown in the following table:
Error Class Range of
Error Num-
bers
Standard
Event
Register
Command
Error
–100 to
–199
bit 5 - CME
Execution
Error
–200 to
–299
bit 4 - EXE
Device- spe
-
cific Error
–300 to
–399
+100 to
+32767
bit 3 - DDE
Query Error
–400 to
–499
bit 2 -QYE
n
Command Error
This error shows that the instrument de
-
tected a syntax error.
Introduction to SCPI
Error Reporting 3-17