Status Registers
The Operation and Questionable status groups use four different types of registers to track qualify, flag, and enable
instrument events. The Standard Event group only uses Event and Enable registers.
The instrument uses IEEE 488 and SCPI registers for the status reports. Each SCPI status register has the following
subregisters:
– CONDition register
– EVENt register
– ENABle register
The registers also include NTRansition and PTRansition filters.
Item
Description
CONDition register A Condition register continuously monitors the instrument state and its bits are updated in real time. The bits are not
latched, and reading this register does not affect the contents.
EVENt register
An Event register latches transitions that pass through the positive and negative transition registers. When an event bit
is set, it remains set until the Event register is read. Reading the Event register clears it. The EVENt register bits are
automatically set according to the changes in the CONDition register and is reset when read. The rule varies depending
on the positive and negative transition filters (PTRansition and NTRansition).
ENABle register
An Enable register defines which bits in the event register are reported to the Status Byte register. You can write to or
read from an enable register.
Transition filter
The transition filters enable or disable the reporting of events when the condition changes from false to true
(PTRansition - positive) or from true to false (NTRansition - negative).
If both filters are enabled, events will be reported each time the status changes; if both filters are cleared, event
reporting is disabled.
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Keysight AC6800 Series Operating and Service Guide
