TDS5000B Online Programmer Guide
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Status and Events
The instrument provides a status and event reporting system for the
GPIB interfaces. This system informs you of certain significant events
that occur within the instrument.
The instrument status handling system consists of five 8--bit registers
and two queues for each interface. The remaining Status subtopics de-
scribe these registers and components. They also explain how the event
handling system operates.
Registers
Overview
The registers in the event handling system fall into two functional
groups:
H Status Registers contain information about the status of the
instrument. They include the Standard Event Status Register
(SESR)
H 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
The Standard Event Status Register (SESR) and the Status Byte Regis-
ter (SBR) record certain types of events that may occur while the in-
strument 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 re-
main at zero. See Enable Registers). Reading the status registers tells
you what types of events 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 sever-
al events, including some front panel actions.
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