MP881W Modem User Guide
60
2130808
Analog input setup
The
Analog
Input
window
(
Tools > Options > MP > Input/Output
)
is
used
to
configure
devices
on
the
four
analog
inputs.
Each
tab
corresponds
to
a
pin:
To
configure
an
analog
sensor
or
gauge,
select
the
tab
that
corresponds
to
the
pin
you
are
using
and
complete
the
fields
as
follows:
•
Label:
Enter
a
description
of
the
sensor
or
gauge
(
Measured
Voltage
,
Vehicle Speed
,
etc.),
up
to
20
characters
long.
•
Raw
value:
Shows
the
analog
value
from
the
input
(read
‐
only).
The
analog
input
has
a
10
‐
bit
(1024
‐
step)
resolution,
so
the
raw
value
range
is
between
0
and
1023.
•
Zero
scale:
Enter
the
minimum
value
for
the
units
you
are
reporting
(used
to
convert
the
raw
analog
value
of
zero).
•
Full
scale:
Enter
the
maximum
value
for
the
units
you
are
reporting
(used
to
convert
the
raw
value
of
1023).
•
Current
value:
Shows
the
resulting
converted
value
using
the
zero
and
full
scales
entered.
•
Unit:
Specify
the
units
of
the
input
(
volts
,
km/h
,
etc.),
up
to
20
characters
long.
Example
If
you
are
measuring
temperature,
and
the
thermometer
you
have
connected
to
the
I/O
connector
measures
between
‐
30
(raw
value
0)
and
+50
(raw
value
1023)
degrees
Celsius,
then
your
zero
scale
is
-30.0
and
your
full
scale
is
50.0
.
Your
label
could
be
“Temperature
”,
and
units,
“degrees C”
.
The
measurements
are
calculated
for
the
81
‐
degree
range
(between
‐
30
and
+50),
which
is
divided
into
1024
steps
(0.0791
degrees
per
unit
step).
A
reading
of
25
degrees
(56
degrees
above
the
minimum)
would
therefore
show
a
raw
value
of
708
(56
degrees/0.0791
degrees
per
unit).
Analog Tab
Connector Pin
Input 1
14
Input 2
7
Input 3
15
Input 4
8
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