Status and Events
The instrument provides a status and event reporting system for the GPIB
interfaces. This system informs you of certain s ignificant events that occur within
the instrume
nt.
The instrument status handling system consists of five 8-bit registers and two
queues for e
ach interface. The remaining Status subtopics describe these registers
and components. They also explain how the event handling s ystem operates.
Registers
The registers in the event handling system fall into two functional groups:
Status Re
gisters contain information about the status of the instrument. They
include the Standard Event Status Register (SESR).
Enable R
egisters 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
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 registe rs.
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 d isable bits so that they ignore events and remain at zero. (See Registers).
Re
ading the status registers tells you what types of e vents have occurred.
The Standard Event Status Register (SESR). The SESR records eight types of
events that can occur within the instrument. Use the *ESR? query to read the
SESR register. Reading the register clears the bits of the register so that the
register can accumulate information about new events.
NOTE. TekVISA applications use SESR bit 6 to respond to any of several events,
including some front panel a ctions.
DSA/CSA/TDS8X00/B Series Programmer Manual 3-1
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