Status Tutorial
This section provides a detailed description of the individual registers and register groups. The status
diagram provides an graphical view of how the status registers and groups are interconnected.
Status Registers
Operation Status Group
Questionable Status Group
Standard Event Status Group
Status Byte Register
Error and Output Queues
Status Diagram
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.
l A Condition register continuously monitors the state of the instrument. The bits in the condition
register are updated in real time and the bits are not latched.
l An PTR/NTR register qualifies the signal that passes to the event register. When a PTR bit is set,
signals with positive edge transition pass to the event register. When an NTR bit is set, signals with
a negative edge transition pass to the event register. When both bits are set, all signal pass. When
neither bits are set, no signals pass.
l 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.
l An Enable register defines which bits in the event register will be reported to the Status Byte
register. You can write to or read from an enable register.
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-
ORed into the OPERation summary bit (7) of the Status Byte register. Refer to Status Registers for a
description of each register. The following table describes the Operation Status register bit
assignments.
6 SCPI Programming Reference
285 Keysight N6900/N7900 Series Operating and Service Guide
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