PoE
AP
Router
163
Chapter
4
Field
Communication
4.1
Bus
&
Protocol
The
gateway
may
equip
a
serial
port
for
various
serial
communication
use
through
connecting
the
RS
‐
232
or
RS
‐
485
serial
device
to
an
IP
‐
based
Ethernet
LAN.
These
communication
protocols
make
user
access
serial
devices
anywhere
over
a
local
LAN
or
the
Internet
easily.
They
can
be
"Virtual
COM"
and
"Modbus".
4.1.1
Port
Configuration
Before
using
the
supported
field
communication
function,
like
Virtual
COM
or
Modbus,
you
need
to
configure
the
physical
communication
port
first.
The
port
configuration
screen
allows
user
to
configure
the
operation
mode
and
physical
layer
settings
for
each
serial
interface,
and
also
can
quick
switch
from
one
communication
protocol
to
another
for
the
serial
port.
The
number
of
ports
and
type
of
the
supported
protocols
could
be
different
for
the
purchased
gateway
model.
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