PoE
AP
Router
166
TCP
Server
Mode
When
the
administrator
expects
the
gateway
to
wait
passively
for
the
serial
data
requests
from
the
Host
Device
(usually
we
use
a
computer
to
play
as
a
Host),
and
the
Host
will
establish
a
TCP
connection
to
get
data
from
the
serial
device,
the
operation
mode
for
the
"Virtual
COM"
function
is
required
to
be
"TCP
Server".
In
this
mode,
the
gateway
provides
a
unique
"IP:
Port"
address
on
a
TCP/IP
network.
It
supports
up
to
4
simultaneous
connections,
so
that
multiple
hosts
can
collect
data
from
the
same
serial
device
at
the
same
time.
After
the
data
has
been
transferred,
the
TCP
connection
will
be
automatically
disconnected
from
the
host
computer
by
using
the
TCP
alive
check
timeout
or
idle
timeout
settings.
UDP
Mode
If
both
the
Remote
Host
Computer
and
the
serial
device
are
expected
to
initiate
a
data
transfer
when
it
requires
doing
that,
the
operation
mode
for
the
"Virtual
COM"
function
in
the
gateway
is
required
to
be
"UDP".
In
this
mode,
the
UDP
data
can
be
transferred
between
the
gateway
and
multiple
host
computers
from
either
peer,
making
this
mode
ideal
for
message
display
applications.
The
remote
host
computer
can
directly
send
UDP
data
to
the
serial
device
via
the
gateway,
and
also
receive
UDP
data
from
the
serial
device
via
the
gateway
at
the
same
time.
The
gateway
supports
up
to
4
legal
hosts
to
connect
simultaneously
to
the
serial
device
via
the
gateway.
