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6.2.7
Service Request Enable Group Structure
Service request enable group register summarizes questionable condition group, standard event
status group and operational condition group events, if these are enabled. The group also contains
busy bit and message available bit and service request bit. The register can be read by *STB?
Command. *CLS command clears service request enable register. Table 6-6 describes bit
configuration of the service request enable register group.
Bit Number Decimal Value
0
1
2
3
4
5
6
7
SYS – System error message available bit. Refer to Section 6.2.6 to read the available error
messages.
QUE – Questionable condition group summary bit. Questionable condition group event has
occurred. Refer to section 6.2.2 to determine which fault has occurred.
MAV – Message available. Refer to section 6.2.5 to read the available message.
ESB – Standard event status group summary bit. Standard event status group event has occurred.
Refer to section 6.2.4 to determine which event has occurred.
OPR – Operational condition group summary bit. Operational condition group event has occurred.
Refer to section 6.2.3 to determine which status has changed.
RQS – Service request. Whenever the power supply requests service, it latches the service
request into service request bit. When the controlling PC services the interrupt, service request bit
is cleared.
Do not enable Service Request when using IVI driver, as IVI does not support a reply from the unit
without initiating a query.
Bit Symbol
1
BSY
2
4
SYS
8
QUE
16
MAV
32
ESB
64
RQS
128
OPR
Table 6-6: Service Request Enable Register
Description
System is busy (Busy bit)
System error message available
Questionable condition group summary event
Message available in output queue
Standard event status group summary event
Service request
Operation condition group summary event
NOTE
161
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