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3 SCPI Programming Reference
Status Registers
Operation Status Group
Questionable Status Group
Standard Event Status Group
Status Byte Register
Error and Output Queues
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.
Operation Status Group
These registers record signals that occur during normal operation. The group consists of a Condition,
PTR/NTR, Event, and Enable register. The outputs of the Operation Status register group are logically
OR-ed into the OPERation summary bit (7) of the Status Byte register. See
description of each register.
106
Keysight AC6800B Series Operating and Service Guide
Status Registers
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