Specifications
I
NTROOUCT
ION
The
Tecmar
5-100
AD212
board
is
designed for sophisticated
industrial,
scientific.
corrmercial.
laboratory
or
educational
apolications requiring high-speed, accurate analog to
digital
conversion including real time
aoolications.
The
AD212
interfaces
various
Complete
Data
Acquisition
Modules
and
the
A~D
9513
Timer
Controller
to each
other
and to
the
5-100 bus.
The
AD212
consists
of
a mother board
that
plugs into the 5-100
bus
which
has
all
the
control logic
and
timer
circuitry,
and
a daughter board
which
has
the data
acquisition
module
and
the associated jumpering. This
daughter
board
can
be
plugged into the mother board inside the
5-100
bus
or connected to the mother board via a ribbon cable.
Placinq the daughter
board
outside the 5-100
bus
is
recommended
for
high gain and/or
14
or
16
bit
operation. A separate enclosure
is
available
for the daughter board.
The
standard
board
can
be
jumpered
for
16
single-ended or 8
true
differential
inputs. Optional expansion boards
which
accommodate
two
exoansion
modules
each
(48
additional single-ended or
24
additional
differential
channels per expansion
module)
provide additional channels
up
to
256
channels.
The
standard resolution
and
accuracy
is
12
bits.
However,
14
and
16
bit
resolution options are
available.
The
higher
resolution
modules
are
designed for sophisticated users with very
exacting requirements.
The
A0212
supports three
different
modes
of
programmable
gain.
The
PRK
precision
resistor
kit
option provides a
selection
of
seven
resistors
to achieve gain
settings
from
1 to
1000.
Software
programmable
gain
of
each channel
is
provided
by
PGH
with gains
of
1,
2,
4,
aDd
8 for high level inputs
or
PGL
with gains
of
1, 10,
100
and
SOD
for
low
level,
wide
range inputs. Single
resistor
gain
proqramming
is
not necessary with software
programmable
gain.
This board complies with the
IEEE
5-100
specifications
and
will
allow 8 or
16
bit
transfer
of
data.
If
8
bit
systems are being used,
two
transfers
are necessary.
However,
if
a
16
bit
system
is
being
used, only
one
transfer
of data
is
required.
The
AD212
automatically
recognizes
if
an
8 or
16
bit
device
is
requesting information
so
both
8
and
16
bit
CPU's
can
be
used
in the
same
system to acquire data
from
this
board.
The
AD2l2
may
~e
jumpered to
act
as
an
I/O
device or
memory-mapped
device
and
requires
16
locations.
The
data
is
latched
after
conversion. This provides the capacity
to
start
the next conversion while reading the information into the
computer's
memory
from
the conversion
just
como1eted.
If
the data
from
the next conversion replaces the data in the latches before the
data
is
read into the computer, a "data overrun"
bit
is
set.
The
throughput using
this
technique
is
comparable to
that
obtained with
direct
memory
access.
The
standard
module
~as
a conversion
rate
of
30
KHz.
However,
options are
available
for conversion
rates
of
40
KHz,
100
KHz
and
125
KHz.