SCPI and IEEE Bus Descriptions
Status Reporting System
4B
4B-21
Standard Status Registers
The Event Status registers are mandatory in all instruments that fulfill the IEEE 488.2
standard. They are structured as shown in Figure 4B-13, and an overview of the status
bits is shown in Figure 4B-14.
Output Queue not empty
<. . . r ead by * STB?
Service Request Enable
Logical OR
Statu s Byte
Register
SRQ
signal
1
6
RQS
MSS
ES
B
MAV
Service
Request
Gener
ation
Standard Event Status Enable
Logical OR
1
6
7
5 4 3 2
0
Output
Queue
1
3 2
0
7
* ESE <NRf
>
* ESE?
*
SRE <NRf >
* SRE?
Standard Event
Status Register
* ESR?
PON URQ
CME EXE DDE
QYE RQC
OPC
ead114f.eps
Figure 4B-13. Structural Overview of the Status Event Register
ead115f.eps
Figure 4B-14. Bits in the Standard Event Status Register
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