HP 8508A - Page 59

Operation
HP-IB
SYSTEMS
Status
Data
Structures
JEEE488.2
allows
the
Status
Byte
to
contain
up
to
seven
single
bit
summary
messages
from
data
structures,
but
the
Vector
Voltmeter
only
makes
use
of
bits
4,
5
and
7
as
described
earlier
in
Sending
the
Status
Byte
Message.
The
status
data
structures
are
queues
or
event
registers
and
the
summary
bits
are
used
as
follows:
*
Bit
4
(MAV)
reports
the
status
of
the
Output
Queue.
~
*
Bit
5
(ESB)
reports
the
status
of
the
Standard
Event
Status
Register.
*
Bit
7
reports
the
status
of
the
Operation
Status
Register.
Figure
3-25
shows
the
Standard
Status
Model
for
IEEEA88.2
instruments.
Two
of
the
Vector
Voltmeter’s
data
structures
are
not
shown,
but
are
described
later.
The
Operation
Status
data
structure
is
similar
to
the
Standard
|
Event
Status
data
structure
and
the
Error
Queue
is
summarised
in
the
error
bits
of
the
Standard
Event
Status
Register.
bo
rm z 3 =
Pe ee
reg, Gd
&
“62s
&
e
}
;
3
>
3
3
% 3
Pibigdgs
nda vi
[7Te
ts]
+]
s[2
[119]
Seater
hegieter
q
“ESR?
% rs
F
r
4
i
i
Standard
Event
|
Status
Enable
Register
wtse <hRf>
|
<r?
:
%
Queve
read by Serie! Poll
Status Bit Regi ster
read by #S1B?
&
2
Q
i)
3
Service Request
Enable Register
#SRE_<NAF>
wSRE?
Figure
3-25.
Standard
Status
Model
E1089
3-35