Agilent Technologies 8960 10 Series Reference Manual page 146

Status Subsystem Overview
event or an inclusive OR of any group of events. Enable Registers are read-write. Enable Registers in the test
set are either 8 or 16 bits long and may contain unused bits which correspond to unused bits in the associated
Event Register. All unused bits return a zero value when read and are ignored when written to. Enable
Registers are unaffected by a *CLS (clear status) command or queries.
Summary Message Bit The Summary Message is a single-bit message which indicates whether or not one
or more of the enabled events have occurred since the last reading or clearing of the Event Register. The test
set logically ANDs corresponding bits in the Event and Enable registers and then performs an inclusive OR on
all the resulting bits to generate the Summary Message. By use of the enable bits, the application program can
direct the test set to set the Summary Message to the 1, or TRUE, state for a single event or an inclusive OR of
any group of events. The Summary Message is TRUE when an enabled event in the Event Register is set
TRUE. Conversely, the Summary Message is FALSE when no enabled events are TRUE. Summary Messages
are always seen as bits in another register.
Status Data Structure - Queue Model
The generalized status queue model is the basis upon which all the status queues in the test set are built. A
queue is a data structure containing a sequential list of information. The queue is empty when all information
has been read from the list. The associated Summary Message is TRUE, logic 1, if the queue contains some
information and FALSE, logic 0, if the queue is empty. Queues can be cleared by reading all the
informationfrom the queue. Queues, except the Output Queue, can also be cleared using the *CLS (clear
status) command.
Summary Message Bit
Queue Empty = "0"
Queue Not - Empty = "1"
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