User manual

Part 6: IEEE 488.2 Command Reference
ESR (Standard Events) Status Register Structure
Bit Value Name Meaning Notes
15...8 Reserved by IEEE 488.2.
7 128 PON Power Off-to-On occurred. The PON bit is always turned on (1) when the unit is
powered up.
6 64 URQ User request. On legacy LeCroy oscilloscopes, this bit reports softkey
inputs. It does not apply to MAUI oscilloscopes.
5 32 CME Command parser error detected. The CME bit is set true (1) whenever a command syn-
tax error is detected. The CME bit has an associated
Command Parser Register (CMR) which specifies the
error code. Refer to
CMR?
4 16 EXE Execution error detected. The EXE bit is set true (1) when a command cannot be
executed due to some device condition (for example,
the oscilloscope in local state) or a semantic error. The
EXE bit has an associated Execution Error Register
(EXR) that specifies the error code. Refer to
EXR?
3 8 DDE Device dependent error occurred. The DDE bit is set true (1) whenever a hardware failure
has occurred at power-up or at execution time, such as
a channel overload condition, or a trigger or timebase
circuit defect. The origin of the failure can be localized
with the
DDR?
query.
2 4 QYE Query error occurred. The QYE bit is set true (1) whenever (a) an attempt is
made to read data from the Output Queue when no out-
put is either present or pending, (b) data in the Output
Queue has been lost, (c) both output and input buffers
are full (deadlock state), (d) an attempt is made by the
controller to read before having sent an <END>, (e) a
command is received before the response to the pre-
vious query was read (output buffer flushed).
1 2 RQC Requests bus control. The RQC bit is always false (0), as the oscilloscope has
no GPIB controlling capability and never requests con-
trol.
0 1 OPC Operation complete. The OPC bit is set true (1) whenever *OPC has been
received, since commands and queries are strictly
executed in sequential order. The oscilloscope starts
processing a command only when the previous com-
mand has been entirely executed.
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