Specifications
2
The
AID
can
be
triggered
by
an
external device. A
TTL
compatible
signal
is
required.
The
external
tr;gqer
signal
;s
under software
control.
For
example. the board could respond to
CPU
commands
which
would
mask
out the external
trigger,
i.e.,
the
AID
could not respond
to
the external
triggers,
and
at
a
later
time. under software
control,
the
board
could
be
made
to
trigger
on
an
external
signal.
There are
also provisions for synchronizing
A/Os
enabling the
acquisition
of
data
from
several
sources
at
the
same
time.
Auto
incrementing
from
any
channel to
any
channel provides the
capability
of obtaining data
at
a specified
starting
channel
and
then the next channel,
etc.
until
the specified ending channel
is
reached
at
which
time
it
automatically obtains data
from
the
starting
channel agian.
Programming
directions
are thoroughly
documented
in the technical
manual
prOVided
with the
ADZ1Z
and
software examples
are
numerous.
The
software
interfacing
techniques
available
include
status
bit
check,
vectored
interrupts
or
CPU
suspension.
The
AD2l2
timer
is
available to the
CPU
as a general timer, to
control
A/D
conversion, or to
interface
equipment external to the
computer.
The
timer
used
is
the
Am9513.
It
also
has
15
lines
available
for external use.
It
contains five independent
16
bit
counters
which
are
cascadable
and
can
provide internal timing
down
to 1 microsecond.
It
is
capable
of
counting events
up
to a
rate
of
7
MHz.
Time
of
day
with a resolution to 1 second
is
available
by
cascading
two
timers.
There are also alarm comparators
on
two
counters.
The
Am95l3
can
be
used
for continuous frequency outputs
or
one-shot.
It
has
programmable
gating
and
count source
selection.
The
Tecmar
AD212
Software Support
Package
(AD212-SSP)
is
designed
to help the user perform
complex
data
acquisition
tasks
and
timing
operations with
an
5-100
computer operating under
CP/M
and
using the
Tecmar
AD212.
The
following tasks
can
be
performed with the
AD2l2-SSP;
1. Set time of
day
2.
Set
24
hour
time
of
day
3.
Read
time of
day
4.
Read
24
hour
alarm
status
5.
Collect a given
number
of
data points using the
AD212
at
a
timer interval varying
from
40
microseconds to
64
kiloseconds
6. Optional continuous visual monitoring
of
the data being
collected
7.
With
the
TM-DA100
an
array
of
data in
memory
is
converted to
an
analog signal
that
can
be
used
to drive a
plotter,
oscilloscope,
etc.
8.
An
event counter
is
provided
which
can
count
from
0 to
64K
9.
A routine
is
provided
which
displays the contents
of
an
integer
array
on
a video monitor (see option
6)
The
AD2l2
is
designed to
meet
a
wide
range of sophisticated
data
acquisition
needs
at
a
low
price with high
reliability.