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Status and Event Processing Sequence
Standard Event Status Register
Read using *ESR?
Cannot be written
Event Status Enable Register
Read using *ESE?
Write using *ESE
Status Byte Register
Read using *STB?
Cannot be written
Service Request Enable Register
Read using *SRE?
Write using *SRE
Figure 3 5: Status and event processing sequence
3026 Programmer Manual
Figure 3-5 shows an outline of the sequence for status and event processing.
7
6
(SESR)
PON
7
6
(ESER)
PON
6
RQS
7
(SBR)
OSB
6
MSS
6
7
6
(SRER)
OSB
1. If an event has occurred, the SESR bit corresponding to that event is set and
the event is placed in the event queue.
2. A bit corresponding to that event in the ESER has is set.
3. The SBR ESB bit is set to reflect the status of the ESER.
4. When a message is sent to the output queue, the SBR MAV bit is set.
5. Setting either the ESB or MAV bits in the SBR sets the respective bit in the
SRER.
6. When the SRER bit is set, the SBR MSS bit is set and a service request is
generated when using the GPIB interface.
1
5
4
3
2
1
CME EXE DDE QYE
2
5
4
3
2
1
CME EXE DDE QYE
3
4
5
4
3
2
1
ESB MAV
QSB
5
5
4
3
2
1
ESB MAV
QSB
Status and Events
0
OPC
Event
Event
Event
0
OPC
Byte
Byte
Byte
0
0
Event
queue
Output
queue
3 7
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