Status and Events
TDS200/1000/2000 Series Oscilloscope Programmer Manual
3−7
NOTE . When a controller sends a query, an <EOM>, and a second
query, the digitizing oscilloscope normally clears the first response
and outputs the second while reporting a Query Error (QYE bit in the
ESER) to indicate the lost response. A fast controller, however, may
receive a part or all of the first response as well. To avoid this
situation, the controller should always read the response immediately
after sending any terminated query message or send a DCL (Device
Clear) before sending the second query.
The Event Queue
The Event Queue stores detailed information on up to 20 events. If
more than 20 events stack up in the Event Queue, the 20th event is
replaced by event code 350, “Too many events.”
Read the Event Queue with EVENT? (which returns only the event
number), with EVMsg? (which returns the event number and a text
description of the event), or with ALLEV? (which returns all the
event numbers along with a description of the event). Reading an
event removes it from the queue.
Before reading an event from the Event Queue, you must use *ESR?
to read the summary of the event from the SESR. This makes the
events summarized by *ESR? available to EVENT? and EVMSG?,
and empties the SESR.
Reading the SESR erases any events that were summarized by
previous *ESR? reads but not read from the Event Queue. Events
that follow an *ESR? read are put in the Event Queue, but are not
available until *ESR? is used again.
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