Configuring the MP Modem to Report GPS and I/O
Data
Rev 1.4 Apr.08
57
A
digital
input
can
be
connected
to
four
of
the
pins
on
the
DB15HD
connector:
Pins
3,
4,
11,
and
12.
(Pins
3
and
11
could
alternatively
be
used
for
digital
output.)
Note: Before using the input/output lines, you must configure them as
inputs or outputs.
Typically
a
digital
input
device
should
be
connected
between
Ground
(Pin
10)
and
the
input
port
(Pin
3,
4,
11,
or
12).
Figure 7-2: A button wired to Pin 4 (digital input) and Pin 10 (Ground).
The
pins
report
a
logic
high
on
an
input
of
3.45
VDC.
An
internal
pull
‐
up
resistor
provides
a
high
condition
when
the
switch
is
open.
The
digital
input
pins
report
a
logic
low
on
an
input
between
0
VDC
and
0.8
VDC.
Sinking
the
input
pin
to
ground
yields
a
logic
low
(0x00)
when
the
port
is
polled.
If
you
configure
the
MP
modem
to
send
data
to
a
network
server,
digital
input
data
can
be
remotely
monitored.
Example: panic button connections
An
I/O
cable
for
a
panic
button
requires
a
wire
to
one
of
the
digital
input
or
I/O
pins
(such
as
#3)
and
one
wire
to
the
Ground
pin
(#10).
Содержание MP 881W
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