Status and Events
The instrument provides a status and event reporting system for the GPIB,
RS-232, and USB interfaces. This system informs you of certain significant
events that occur within the instrument.
The instrument status reporting system consists of five 8-bit registers and two
queues. This section describes these registers and components, and explains how
the event handling system operates.
Registers
Overview
The registers in the event handling system fall into two functional groups:
â–
Status Registers contain information about the status of the instrument. They
include the Standard Event Status Register (SESR).
â–
Enable Registers determine whether selected types of events are reported to
the Status Registers and the Event Queue. They include the Device Event
Status Enable Register (DESER), the Event Status Enable Register (ESER),
and the Service Request Enable Register (SRER).
Status Registers
The Standard Event Status Register (SESR) and the Status Byte Register (SBR)
record certain types of events that may occur while the instrument is in use. IEEE
Std 488.2-1987 defines these registers.
Each bit in a Status Register records a particular type of event, such as an
execution error or message available. When an event of a given type occurs, the
instrument sets the bit that represents that type of event to a value of one. (You
can disable bits so that they ignore events and remain at zero. See Enable
Registers). Reading the status registers tells you what types of events have
occurred.
TBS2000 Series Programmer 275
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