4339B
Status
Reporting
Structure
Status
Byte
Register
The
Status
Byte
Register
is
composed
of
eight
bits
that
summarize
an
overlaying
status
data
structure
.
The
Status
Byte
Register
can
be
read
using
either
3 STB?
or
SPOLL ,
which
return
a
decimal
expression
of
the
contents
of
the
register
(equal
to
the
sum
of
the
total
bit
weights
of
all
the
bits
set
to
\1").
Figure
5-3.
Status
byte
Register
T
able
5-2.
Status
Byte
Assignments
Bit
No
.
Bit
W
eight
Description
7
128
Operation
Status
Register
Summary
Bit
6
64
Request
Service
Bit
|
This
bit
is
set
when
any
enabled
bit
of
the
Status
Byte
Register
has
been
set,
which
indicates
4339B
has
at
least
one
reason
for
requesting
service
.
SPOLL
resets
this
bit.
5
32
Standard
Event
Status
Register
Summary
Bit
4
16
Message
A
vailable
Bit
|
This
bit
is
set
whenever
the
4339B
has
data
available
in
the
Output
Queue
,
and
is
reset
when
the
available
data
is
read.
3
8
Questionable
Status
Register
Summary
Bit
2-0
always
0
(zero)
GPIB
Reference
5-41
Summary of Contents for 4339B
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Page 268: ...Procedure 4339B Figure B 5 A1 Main Board B 8 Handler Interface Installation ...