Specifications
AD,1,
CIRCUIT
~,SCRIPTIO~
AND
SET-UP
GUIDE
,.
Conventions
•
Orientation
references
in
the
fol1owin3
description
such as
I'U,.
dOk'n".
etc.
assu,e
tnat
the
ADZ12
is
being
viewed
with
its
S100
connector (Pl) oointing
down.
Signals
described
as
being
"high"
or
"low"
refer
to
voltages
of 3 to 5 volts or zero
volts.
resoectively. Signals described as
being
"true"
or
"false"
refer
not
to
voltage
levels,
but
to
the
relationship
between
the voltage levels
and
the presence or
absence
of
"bubbles"
(or
small
circles)
where
the
signal
trace
on
the
sche~atic
connects
to
the
circuit
element.
The
absence of a
bubble
means
that
"true"
;s
"hioh"
and
"false"
is
"low". The'
presence
of
a bubble means
that~"true"
;s
"low" and
"false"
is
"higlt".
2. Genera 1
The
AD212
is
constructed out of
two
orinted
circuit
boards,
one
of
which
is
called the mother
board
and
the other the daughter
board.
The
Mother
board
contains
entirely
digital
logic
and
plugs
directlY into the
5100
bus.
The
daughter board contains
all
the
analog
circuitry
and
is
designed to bolt
rigidly
to the
back
of
the mother board thus creating a single
unit
which
occupies
two
SlOO
bus
slots.
Pin
and
socket
style
connectors are
used
to
carry signals
between
tne
two
boards. Since these are comoatible
with ribbon cable connectors,
it
is ootionally possible to
locate
the daughter
board
at
a location
remote
from
the
5100
mainframe.
This feature
has
the advantage of
~llowing
the
dau9~ter
board
to
be
located nearer
to
the source of the
sign~ls
being acquired
rather
than
havinQ
to
run
these signals over a
sistance
and
into
the noisy
S100
mainfral"1e
which
might
cause noise pickup.
The
II
AD212
is
designed
to
work
with
as
much
as about
100
feet
of
ribbon cabie
between
the
two
boards
alt~ouqh
even
lancer runs
may
be
possible deoending
on
the environment.
The
daughter board
has
six standoffs
swaged
to
it
that accept 6-32 threaded bolts to
facilitate
mountin~
in a
remote
location.
The
AD2l2
is
designed to
be
totally
compatible with the
orooosed
IEEE
SlOO
bus
standards. This
is.
in general,
an
advantaoe, but there are
specif~c
details
in the
new
standard
which
are not compatible with
some
earlier
processors.
For
users
of
the
A0212.
the
most
important potential incompatibility
arises
from
the
fact
that
the
A0212
uses
all
of
the
proDosed.
additional
ground
connections to the
5100
bus.
These
are pins 20.
53
and
70.
If
any
of
these
bus
lines
are in
use
in the
machine
which
the
ADZ1Z
will
be
used
with, then the correspondinq
9round
traces
on
the
ADZ12
must
be
cut near the
edge
connector.
These
traces
may
be
identified
in
part
by
their
width wiieh
is
wider than
that
of
the signal
traces.
6