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Chapter 4 201
Status Registers
Use Status Registers to Determine the State of Analyzer Events and Conditions
Stat
us Re
giste
rs
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, “Remote Command Reference.” under the
subsection entitled “IEEE Common Commands” on page 235 .