Query Response Timing - ILX Lightwave LDC-3926339 User Manual

R E M O T E O P E R A T I O N S
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C H A P T E R
Remote Configuration
The *WAI (common command) is an example of a sequential command which
forces the next command to wait until the no-operation-pending flag is true. This is
essentially the same as waiting for the OPC flag to become true, because the no-
operations-pending flag is used to set the OPC flag (bit 0 of the Standard Event
Status Register).
Commands that change the status of the instrument limits, or change its mode or
current range, step value, or status enable registers, do not have their OPC flag
set until all current writing to non-volatile memory has been completed. This
ensures the OPC flag is never set prematurely.

Query Response Timing

Query responses are evaluated at the time the query request is parsed, and not at
the time the response message is sent. In most cases this does not create a
problem since the time between parsing a query and sending its response is
small.
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LDC-3926339
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