86 N9030B PXA Signal Analyzer Service Guide
Instrument Messages
Introduction
Figure 3-1 Error Message Example
Event Queues
There are several different event queues that are viewed/queried and managed
separately. Note that Conditions are logged in the queues as pairs of events: a
“Detected” event and a corresponding “Cleared” event.
Front Panel Status
Error messages can be viewed by pressing,
System, Show Errors, Status. The Status
screen shows error conditions that currently exist. When an error event is caused by a command
sent over a remote interface, the resulting messages are logged in the queue for that interface.
For convenience, they are also logged in the front panel queue.
Front Panel History
Error messages can be viewed by pressing,
System, Show Errors, History. The History
screen shows all the error events that have occurred since the instrument was turned on, with a
maximum of 100 messages. When an error situation is caused by a command sent over a remote
interface, the resulting messages are logged in the queue for that interface. For convenience, they
are also logged in the front panel queue.
Remote interfaces
(GPIB/LAN)
When an error event is caused by a command sent over a remote interface, the resulting
messages are output to the queue for that interface. To return an error, you must query the queue
for that interface. An error event that is caused by a front panel action is not reported to any
remote interface queue. However, a status condition is usually caused by an internal event that is
not related to a particular interface, so the Detected/Cleared events for status conditions are
reported to all the error queues.
Table 3-1 Characteristics of the Event Queues
Characteristic Front-Panel Status Front-Panel History Remote Interfaces (GPIB/LAN)
Capacity (maximum
number of messages)
100 100 100
Overflow Handling
Circular (rotating).
Drops oldest error as new
error comes in.
Circular (rotating).
Drops oldest error as new
error comes in.
Linear, first-in/first-out.
Replaces newest error with:
−350, Queue overflow
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