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5 SCPI Programming Reference
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 Groups
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.
A Condition register continuously monitors the state of the instrument. The bits in the condition
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register are updated in real time and the bits are not latched.
An PTR/NTR register qualifies the signal that passes to the event register. When a PTR bit is set,
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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.
An Event register latches transitions that pass through the PTR and NTR registers. When an event
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bit is set, it remains set until the Event register is read. Reading the Event register clears it.
An Enable register defines which bits in the event register will be reported to the Status Byte
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register. You can write to or read from an enable register.
Operation Status Group
These registers record signals that occur during normal operation. The groups consist 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
The following table describes the Operation Status register bit assignments.
252
Status
Keysight RP7900 Series Operating and Service Guide
Diagram.
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