Status and Events

3–6 TDS Family Oscilloscope Programmer Manual

Event Handling Sequence

Figure 3–6, on page 3–6, shows how to use the status and event handling

system. In the explanation that follows, numbers in parentheses refer to numbers

in Figure 3–6.

Device Event Status Enable Register
(DESER)
Read using DESE?
Write using DESE
Standard Event Status Register
(SESR)
Read using *ESR?
Cannot be written
Event Status Enable Register
(ESER)
Read using *ESE?
Write using *ESE
Status Byte Register
(SBR)
Read using *STB?
Cannot be written
Service Request Enable Register
(SRER)
Read using *SRE?
Write using *SRE
Event
Queue
Output
Queue
Event
Event
Event
Byte
Byte
Byte
1
2
3
4
6
7
5
PON URQ CME EXE DDE QYE RQC OPC
76543210
PON URQ CME EXE DDE QYE RQC OPC
76543210
PON URQ CME EXE DDE QYE RQC OPC
76543210
—
RQS
ESB MAV — — — —
MSS
76543210
6
— — ESB MAV — — — —
76543210

Figure 3–6: Status and Event Handling Process

When an event occurs, a signal is sent to the DESER (1). If that type of event is

enabled in the DESER (that is, if the bit for that event type is set to 1), the

appropriate bit in the SESR is set to one, and the event is recorded in the Event

Queue (2). If the corresponding bit in the ESER is also enabled (3), then the ESB

bit in the SBR is set to one (4).