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In this appendix:

Overview ................................................................................. C-1

Serial polling and SRQ .......................................................... C-13

Programming enable registers .............................................. C-13

Reading the registers ............................................................ C-14

Understanding bit settings ..................................................... C-15

Clearing registers .................................................................. C-16

Status model programming examples ................................... C-17

Overview

The status model consists of status register sets and queues. You can monitor the status model to

view instrument events; you can also configure the status model to control the events.

As you work with the status model, keep in mind the end result applies to the Status Byte Register. All

the status register sets and queues flow into the Status Byte Register. Your test program can read

this register to determine if a service request (SRQ) has occurred, and if so, which event caused it.

The Status Byte Register register sets and queues include:

• Standard Event Register

• Questionable Event Register

• Operation Event Register

• Output Queue

• Error Queue

The relationship between the Status Byte Register, Standard Event Register, event queue, and the

output queue is shown in the Non-programmable status registers diagram (on page C-2

). The

relationship between the Status Byte Register, Questionable Event Register, and the Operation Event

Programmable status registers diagram (on page C-6).

Appendix C

Status model

Keithley 2450 User Manual

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