4
Remote Operations Using the IEEE 488 Interface
Status Reporting
Power On
User Request
Command Error
Execution Error
Device Dependent Error
Query Error
Operation Complete
Measurement Event
Overload
Lo Limit
Hi Limit
Min
Max
Service Request
∗ SRE
phs Nrf
Enable Register
∗ SRE?
MSS
ESB MAV MES
STATUS BYTE
REGISTER
7
6
5 4 3 2 1 0
RQS
∗ STB?
Request for Service Bit
Master Status Summary Bit
Event Status Summary Bit
Message Available Bit
Measurement Event Status
Summary Bit
Event
7 6 5 4 3 2 1 0
PON URQ
CME
OPCEXE DDE QYE
Standard-
Defined Event
Status Register
RQC
∗ ESE
phs Nrf
Status Enable Register
∗ ESE?
∗ ESR?
Request
Control
Not used
on 1281
Number of stored readings
matches commanded block size
Mathematical Overflow
7 6 5 4 3 2 1 0
O-L LLM HLM MIN
Measurement
Event Status
Register
MOF
Status Enable Register
Reading Available
RAV
MAX
STC
MESE
phs Nrf
MESE?
MESR?
adj255f.eps
Status Data Structure
Read Service Request Register
STB?
*
adj266f.eps
Read Service Request Register
*STB?
(Nr1) Recalls the service request register for summary bits. The returned value , when
converted to base 2 (binary), identifies the summary bits as detailed in the status data
structure diagram. There is no method of clearing this byte directly. Its condition relies on
the clearing of the overlying status data structure.
Service Request Enable
Nrf
phs
SRE
*
adj262f.eps
Service Request Enable
∗SRE
Enables the standard and user-defined summary bits in the service request byte, which
will generate a service request.
4-41
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