EXFO IQS-600 Integrated Qualification System - Manual (Page 186)

Using IQS Products in an Automated Test Environment
178 IQS-600
Message Management
Error/Event queue

Consists of a First-In, First-Out
(FIFO) data structure.

Total storage capacity: 50 errors or
events.

Errors or events can be retrieved,
one at a time, with
:SYSTem:ERRor[:NEXT]?.

When an error or event occurs
and the Error/Event queue is full,
the last item in the queue (the
most recent) is removed and the
Queue overflow error
(error –350) is added. No new
items will be stored into the queue
until there will be room available.

As soon as there is data in the
output queue, the Error AVailable
bit (bit number 2 –EAV from the
Status Byte register) is set to 1.
The Error/Event queue will
be cleared when:

Reading all the items it
contains.

Turning off the power.

Sending a Device Clear
(DCL) message to the
instrument.

Sending a
Selected Device Clear
(SDC) message to the
instrument.

Using the *CLS
command.
Data structure Characteristics Clearing