Technical data

Introduction to SCPI 1
U2761A Programmer’s Reference 11
SCPI Status System
The status system records various instrument conditions and states in
several register groups. Each register group is made up of several low-level
registers called Condition register, Event register, and Enable register
which control the action of specific bits within the register group.
A Condition register continuously monitors the state of the instrument.
The bits in the condition register are updated in realtime and the bits are
not latched or buffered. This is a read- only register and the bits are not
cleared when you read the register.
An Event register latches the various events from the changes in the
condition register. There is no buffering in this register; while an event bit
is set, subsequent events corresponding to that bit are ignored. This is a
read- only register. Once a bit is set, it remains set until cleared by a
query or clear status (*CLS) command.
An Enable register defines which bits in the event register will be reported
to the Status Byte register group. You can write to or read from an enable
register.
The relationship between various registers in the U2761A SCPI status
system is shown in Figure 1- 2.