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6
Figure
6-1.
Common
Status
Registers
*
The
questionable
and
operation
status
trees
are
described
in
\ST
A
Tus
Commands".
Note
Unused
bits
in
any
of
the
registers
return
0
when
you
read
them.
SRQ,
The
Service
Request
A
service
request
(SRQ)
occurs
when
a
bit
in
the
Status
Byte
register
goes
from
0
!
1
AND
the
corresponding
bit
in
the
Service
Request
Enable
Mask
is
set.
The
Request
Service
(RQS)
bit
is
set
to
1
at
the
same
time
that
the
SRQ
is
caused.
This
bit
can
only
be
reset
by
reading
it
by
a
serial
poll.
The
RQS
bit
is
6-6
Remote
Commands