Teledyne Lecroy WaveAce 1000, Command Reference Manual, Page: 61 / 92

Operator's Manual
Bit Value Name Description Note
3 8 DDE 1 - Device Dependent
(specific) Error occurred.
The Device specific Error (DDE) 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 1 - QuerY Error occurred. The QuerY Error bit (QYE) is set true (1) whenever (a) an
attempt is made to read data from the Output Queue when
no output 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 previous
query was read (output buffer flushed).
1 2 RQC 0 - Oscilloscope never
ReQuests bus Control.
The ReQuest Control bit (RQC) is always false (0), as the
oscilloscope has no GPIB controlling capability.
0 1 OPC 0 - OPeration Complete bit
not used.
The OPeration Complete bit (OPC) 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 command
has been entirely executed
STATUS - *OPC
The *OPC (OPeration Complete) command sets to true the OPC bit (bit 0) in the Standard Event Status
Register (ESR).
The *OPC? query always responds with the ASCII character 1 because the oscilloscope only responds to
the query when the previous commands are entirely executed. Since *OPC? executes only when
processing is complete, it is recommended for synchronization purposes.
Command Syntax
*OPC
Query Syntax
*OPC?
Response Format
*OPC 1
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