126 Chapter 3
Programming the Status Register System
Status Groups
Status Groups
The Standard Operation Status Group and the Data Questionable Status Group consist of the registers listed
below. The Standard Event Status Group is similar but does not have negative or positive transition filters or
a condition register.
Condition
Register A condition register continuously monitors the hardware and firmware status of the
signal generator. There is no latching or buffering for a condition register; it is updated
in real time.
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. Once the bits in the event register are set, they
remain set until cleared by either querying the register contents or sending the *CLS
command.
Event
Enable
Register An enable register specifies the bits in the event register that generate the summary bit.
The signal generator logically ANDs corresponding bits in the event and enable
registers and ORs all the resulting bits to produce a summary bit. Summary bits are, in
turn, used by the Status Byte Register.
A status group is a set of related registers whose contents are programmed to produce status summary bits.
In each status group, corresponding bits in the condition register are filtered by the negative and positive
transition filters and stored in the event register. The contents of the event register are logically ANDed with
the contents of the enable register and the result is logically ORed to produce a status summary bit in the
Status Byte Register.
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