Event Queues - Keysight n9020a Service Manual

Instrument Messages
Introduction
Figure 3-2 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.
Table 3-1 Event Queue Types
Front Panel Status
Error messages can be viewed by pressing,
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,
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 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
(GPIB/LAN)
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 3-2 Characteristics of the Event Queues
Characteristic
Capacity (maximum
number of messages)
Front-Panel Status
100
System Show Errors, Status
,
System Show Errors, History
,
Front-Panel History
100
76
. The Status screen
. The History
Remote Interfaces (GPIB/LAN)
100