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STATUS DATA STRUCTURE
-
REGISTER
MODEL
Below
is a generalised model
of the Register Set which funnels the monitored data into
a
single summary bit to set the
appropriate bit in the Status Byte.
Device Status continuously monitored by Condition Register
Summary
Message
00072
Notes...
The
Device
Status is continuously
monitored by the Condition Register. If a Query
to
read a Condition
Register is provided, the Response represents
the Status of the
instrument at the moment the Response
is generated. A Condition Register cannot be
written to.
The Transition Filter determines which
transition of the Condition Register data
bits
will
set the corresponding
bit in the Event Register. Either positive-going, negative-going
or
both transitions can set bits in an Event
Register. But in the 2040 series the Transition
Filters are pre-set as either Positive
or Negative, as described in the following
pages.
The bits in an Event Register are
"latched". Once set they remain set, regardless
of
subsequent changes
in the associated condition bit until the Event
Register
is
cleared by
46882-074C
3-2-41
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