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5-59
Bit 5, Event Summary Bit (ESB)
Set bit indicates that an enabled standard event has oc-
curred. The event can be identified by reading the Standard Event Status Register using the
*ESE? query command (see paragraph 5.10.2).
Bit 6, Master Summary Status (MSS) / Request Service (RQS)
Set bit indicates that one
or more enabled conditions have occurred to generate a service request (SRQ). Note that the
IEEE-488.1 standard designates Bit 6 as the RQS bit and is read by performing a Serial Poll.
Bit 7, Operation Summary Bit (OSB)
Set bit indicates that an enabled operation event has
occurred. The event can be identified by reading the Operation Event Status Register using the
following SCPI command structure:
:STATus:OPERation?
See paragraph 5.16 for details.
10
OUTPUT 707; “*SRE?”
! Request contents of register
20
ENTER 707; A$
! Address 7001 to talk
30
PRINT A$
! Display value of register
40
END
Programming
example
Figure 5-16
Status Byte Register
B7
B6
B5
B4
B3
B2
B1
B0
(2 )
7
(2 )
6
(2 )
5
(2 )
4
(2 )
3
(2 )
2
32
0/1
Bit Position
Event
Decimal Weighting
Value
Value : 1 = Event Bit Set
0 = Event Bit Cleared
Events : OSB = Operation Summary Bit
MSS = Master Summary Status
RQS = Request Service
ESB = Event Summary Bit
MAV = Message Available
QSB = Questionable Summary Bit
EAV = Error Available
OSB
ESB MAV QSB EAV
0/1
0/1
0/1
0/1
128
16
8
4
MSS,
RQS
64
0/1
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