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REMOTE OPERATION

46882/439 5-31

Status data structure − register model

Below is a generalized model of the Register Set which funnels the monitored data into a single

summary bit to set the appropriate bit in the Status Byte.

Event

Enable

Summary Message

Transition

Filter #

Condition

Event

C0072

➤

Device Status continuously monitored by Condition Register

dddd

n n-1

3120

dddd

3120

n-1

n n-1

3210

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 2026 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

being read or by the *CLS common command. Once cleared, an Event Register bit will

only be set again if the appropriate change in the Condition bit occurs.

The Event Enable Register may be both written to and read from. It is bitwise AND-ed

with the Event Register and if the result is non-zero the Summary Message is true,

otherwise the Summary Message is false. Enable Registers are not affected by *CLS but

are however clear at power-on.

IFR 2026 User Manual

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