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7451A/7461A/7461P Digital Multimeter Operation Manual

6.7.5 Status Register Structure

6-45

6.7.5 Status Register Structure

This instrument has a layered status register structure that is compliant with IEEE standard 488.2-1987 and

can send various statuses of this instrument to the controller. This section describes the operation model

of status structure and allocation of events.

1. Status register

This instrument adopts the model of the status register defined in IEEE standard 488.2-1987. The sta-

tus register consists of the event register and enable register.

• Event register

The event register latches and retains statuses correspondent to each event. (Sometimes the changes

are retained.)

Once this register is set, the setting value is kept until it is read by a query or cleared by *CLS.

Data cannot be written into the event register.

• Enable register

The enable register specifies which bit in the event register is set as an effective status to generate a

summary. The enable register is ANDed with the event register and the OR of the result is generated

as a summary. The summary is written into the status byte register.

Data can be written into the enable register.

This instrument uses the following five types of status registers:

• Status Byte Register (STB)

• Standard Event Status Register (SESR)

• Measurement Event Register (MER)

• Questionable Event Register (QER)

• Operation Event Register (OER)

Event

Enable

n-1

Summary

n-1

ADCMT 7451A User Manual

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