Chapter Seven: IEEE-488 Communications Option
Status Information
105
Status Information
The 670 instrument uses two software registers (defined by IEEE-488.2) to provide status
information. The registers are the Standard Event Status register and the Status Byte register.
The relationship of the registers is shown in Figure 17.
7
6 5
4
3
2
1
0
7
6 5
4
3
2
1
0
Po
w
e
r O
n
No
t U
s
e
d
U
n
re
c
o
gn
iz
ed
Cm
d
In
ap
pr
op
ri
a
te Cm
d
D
a
ta
In
v
a
lid
Qu
er
y
E
rr
o
r
No
t U
s
e
d
No
t U
s
e
d
&
&
&
&
&
&
&
&
Logical OR
Standard Event
Status Register
Standard Event Status
Enable Register
7
6 5
4
3
2
1
0
7
5
4
3
2
1
0
&
&
&
&
&
&
&
Lo
gi
ca
l OR
Status Byte Register
No
t U
s
e
d
No
t U
s
e
d
No
t U
s
e
d
No
t U
s
e
d
No
t U
s
e
d
Re
qu
es
t S
e
rv
ic
e
E
v
en
t S
tat
us
B
it
M
e
s
s
ag
e A
v
a
ila
bl
e
Output Queue
}
Queue
Not Empty
Service
Request
Generation
Service Request
Enable Register
{
Figure 17: IEEE-488 Registers
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