Tektronix WCA230A, Programmer'S Manual

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Status and Events
3- 12
WCA230A & WCA280A Programmer Manual
Queues
There are two types of queues in the status reporting system used in the analyzer:
output queues and event queues.
The output queue is a FIFO queue and holds response messages to queries,
where they await retrieval. When there are messages in the queue, the SBR MAV
bit is set.
The output queue will be emptied each time a command or query is received, so
the controller must read the output queue before the next command or query is
issued. If this is not done, an error will occur and the output queue will be
emptied; however, the operation will proceed even if an error occurs.
The event queue is a FIFO queue and stores events as they occur in the analyzer.
If more than 32 events occur, event 32 will be replaced with event code --350
(“Queue Overflow”). The error code and text are retrieved using the
:SYSTem:ERRor queries.
Output Queue
Event Queue