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TDS 310, TDS 320 & TDS 350 Programmer Manual
3Ć1
Status and Events
The oscilloscope provides a status and event reporting system for the GPIB
and RSĆ232 interfaces. This system informs you of certain significant events
that occur within the oscilloscope.
The oscilloscope status handling system consists of five 8Ćbit registers and
two queues. This section describes these registers and components, and
explains how the event handling system operates.
The registers in the event handling system fall into two functional groups:
H The Standard Event Status Register (SESR) and the Status Byte Register
(SBR) contain information about the status of the oscilloscope. These
registers are the Status Registers.
H The Device Event Status Enable Register (DESER), the Event Status
Enable Register (ESER), and the Service Request Enable Register
(SRER) determine whether selected types of events are reported to the
Status Registers and the Event Queue. These three registers are the
Enable Registers.
Status Registers
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 3Ć3.) Reading the status registers tells you
what types of events have occurred.
The Standard Event Status Register (SESR) Ċ The SESR, shown in
Figure 3Ć1, records eight types of events that can occur within the oscilloĆ
scope. Use *ESR? to read the SESR register. Reading the register clears the
bits of the register so that the register can accumulate information about new
events. Table 3Ć1 shows SESR bit functions.
PON URQ CME EXE DDE QYE RQC OPC
76543210
Figure 3Ć1:ăThe Standard Event Status Register (SESR)
Registers