TDS3000, TDS3000B, and TDS3000C Series Programmer Manual
3-1
Status and Events
TDS3000B and TDS3000C Series oscilloscopes provide a status and event
reporting system for GPIB and RS-232 interfaces. This system informs you of
significant events that occur within the oscilloscope.
The oscilloscope status handling system consists of five 8-bit registers and two
queues. This section describes these registers and components. It also explains
how the event handling system operates.
Registers
The registers in the event handling system fall into two functional groups:
H Status Registers contain information about the status of the oscilloscope.
They include the Standard Event Status Register (SESR) and the Status Byte
Register (SBR).
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).
The Standard Event Status Register (SESR) and the Status Byte Register (SBR)
record certain types of events that may occur while the oscilloscope 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 service request. When an event of a given type occurs, the
oscilloscope 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 the Enable
Registers section on page 3--3.) Reading the status registers tells you what types
of events have occurred.
The Standard Event Status Register (SESR). The SESR, shown in Figure 3--1,
records eight types of events that can occur within the oscilloscope. 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.
PON URQ CME EXE DDE QYE RQC OPC
76543210
Figure 3- 1: The Standard Event Status Register (SESR)
Status Registers
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