Status Registers

Use Status Registers to Determine the State of Analyzer Events and Conditions

Status registers (except for the status byte register and the standard event status register) consist of the registers whose contents can be used to produce status summary bits.

These summary bits are then manipulated as follows: The condition register passes summary bits to the negative and positive transition filters, after which they are stored in the event register. The contents of the event register are logically ANDed with the contents of the event enable register and the result is logically ORed to produce a status summary bit. The status summary bit is then passed to the status byte register either directly, or through the STATus: QUEStionable register. Next, the summary bits are logically ANDed with the contents of the service request enable register and the result is logically ORed to produce the request service (*RQS) bit in the status byte register.

How Do You Access the Status Registers?

There are two different methods to access the status registers:

•Common Commands Accesses and Controls

•Status Subsystem Commands

Common Command Access and Control

Most monitoring of the analyzer conditions is done at the highest level using the following IEEE common commands:

*CLS (clear status) clears the status byte by emptying the error queue and clearing all the event registers.

*ESE,*ESE? (event status enable) sets and queries the bits in the enable register part of the standard event status register.

*ESR? (event status register) queries and clears the standard event status register.

*OPC (operation complete) sets bit 0 in the standard event status register when all operations are complete.

*SRE,*SRE? (service request enable) sets and queries the value of the service request enable register.

*STB? (status byte) queries the value of the status byte register without erasing its contents.

Complete command descriptions are given in Chapter 5, “Language Reference,” under the subsection entitled “IEEE Common Commands” on page 193.

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Agilent Technologies Model A.08.xx manual How Do You Access the Status Registers?, Common Command Access and Control
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