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Chapter 4 199
Status Registers
Use Status Registers to Determine the State of Analyzer Events and Conditions
Stat
us Re
giste
rs
composed of the five individual registers described below. One such status register in the figure is
entitled “STATus: QUEStionable,” which is both the name of the register, and the SCPI command form
used to access the register. From now on, the SCPI command form will be used when referring to the
various registers. There are IEEE common SCPI commands noted under some register names in
parenthesis. These commands are associated with those registers, and their effects are described under
“How Do You Access the Status Registers?” in this chapter, and in the beginning of Chapter 5, “Remote
Command Reference.” in this guide.
Refer to the right-hand part of the STATus: QUEStionable register while reading the following register
descriptions.
Condition
Register
A condition register continuously monitors the hardware and firmware status of the
analyzer. There is no latching or buffering for a condition register.
Negative
Transition
Filter
A negative transition filter specifies the bits in the condition register that will set
corresponding bits in the event register when the condition bit changes from
1 to 0.
Positive
Transition
Filter
A positive transition filter specifies the bits in the condition register that will set
corresponding bits in the event register when the condition bit changes from
0 to 1.
Event
Register
An event register latches transition events from the condition register as specified by
the positive and negative transition filters. Bits in the event register are latched, and
once set, they remain set until cleared by either querying the register contents or
sending the
*CLS
command.
Event
Enable
Register
An event enable register specifies the bits in the event register that can generate a
summary bit. Summary bits are, in turn, used by the status byte register.