HP 3468A - Page 48

HP3468A
FINDID
Comments
The FINDID (FIND IDentity) function searches for a device with a specific identity
and determines the address of that device. The device identity is placed in the
Alpha
register
of
the
calculator
before
FINDID
is
executed.
For
the
3468A
the
identity
is:
HP3468A.
The
decimal
address
of
the
device
is
returned
to
the
X-register of the calculator.
In
the
Auto
mode,
the
interface
searches
the
entire
loop
starting
at
the
“SELECTED”
device.
In
the
Manual
mode,
the
interface
checks
only
the
“SELECTED”
device.
What
happens
when
there
are
two
or
more
3468A’s
in
the
loop?
If
the
interface
is
in
the
Auto
mode when
FINDID
is
executed,
the
address
of
the
first
3468A
is
returned and the search ends. If we then “SELECT”
the device (see SELECT) after
the
first
3468A
and
execute
FINDID
again,
it
will
return
the
address
of
the
second
3468A.
In
this
manner,
by
selecting
the
device
after
the
3468A,
we
can
find
the
address of the next 3468A with FINDID.
MANIO
=xample
MANIO.
Comments
The MANIO (MANuai |/O) function sets the interface to the manual mode (sets
Flag 32 in the calculator). This means that devices such as printers and mass
storage
cassette
drives
must
be
manually
selected.
See
also
-
AUTOIO.
43