Specifications

3-3
Interrogating the Instrument Status
Generalized Status Register Group Model
Generalized Status Register Group Model
SCPI guidelines specifies a register group model which is the building block of the SCPI
status reporting system. The SCPI generalized status register group model is shown in
Figure 3-1.
Figure 3-1 Generalized Status Register Group
Condition Register This register monitors the hardware and firmware status of the
instrument. There is no latching of conditions in this register, it is
updated in real time.
Transition Filter As the name implies it determines whether positive or negative
transitions (true or false) in the Condition register sets the Event
register.
Event Register This register latches the transient states that occur in the Condition
register as specified by the Transition Filter.
Enable Register The Enable Register acts as a mask on the Event register. It
determines which bits in the Event register set the summary bit in
the Status Byte.
This reporting structure is the basis of generating interrupts that is, service requests, and is
explained more fully in the section titled Interrupt Programming and Using the Service
Request on page 3-17.