VXi VT1529A/B 사용자 설명서

The STATus subsystem communicates with the SCPI defined Operation and 
Questionable Data status register sets. Each is comprised of a Condition register, a 
set of Positive and Negative Transition Filter registers, an Event register, and an 
Enable register. Condition registers allow the current real-time states of their status 
signal inputs (signal states are not latched) to be viewed. The Positive and Negative 
Transition Filter registers allow the polarity of change from the Condition registers 
that will set Event register bits to be controlled. Event registers contain latched 
representations of signal transition events from their Condition register. Querying an 
Event register reads and then clears its contents, making it ready to record further 
event transitions from its Condition register. Enable registers are used to select which 
signals from an Event register will be logically OR’ed together to form a summary 
bit in the Status Byte Summary register. Setting a bit to 1 in an Enable register enables 
the corresponding bit from its Event register.

 

Condition
Register

Bit 0

Bit 1

Bit 15

Bit 14

Event
Register

Enable
Register

Logical

OR

Summary Bit to

Status Byte

Positive/Negative
Transition Filter

latch

latch

latch

latch

=1

=1

=1

=1

=1

=1

=1

=1