Modbus
Cellular
Gateway
Index
skipping
is
used
to
reserve
slots
for
new
function
insertion,
when
required.
345
Modbus
Serial
Definition
Window
Item
Value setting
Description
Serial
Port
N/A
It
displays
the
name
of
the
serial
port
used.
E.g.
SPort
‐
1
Serial
Mode
Slave
is
set
by
default
Select
Slave
Serial
Protocol
RTU
is
set
by
default
Select
RTU
or
ASCII.
Then
Click
Save
to
save
the
setting.
Enable
N/A
It
displays
whether
it
is
enabled
or
disabled.
To
enable
or
disable
Modbus
go
to
Advanced
Network
>
Communication
Bus
>
Port
Configuration
tab.
Save
N/A
Click
the
Save
button
to
save
the
settings.
Setup
TCP/IP
Connection
for
Receiving
Modbus
Master
Request
The
TCP
Connection
Configuration
screen
allows
the
Modbus
device
operator
to
set
up
the
AMIT
gateway
of
the
attached
Modbus
Slave
to
listen
for
the
server
request
(that
is
coming
from
the
TCP
Client’s
connection
request)
on
the
specified
TCP
port.
Before
Modbus
Slave
can
receive
requests
from
the
server,
TCP
session
connection
must
be
established
first.
Specify
the
gateway’s
TCP
server
listening
port
number
to
receive
TCP
client’s
(Modbus
Server
side)
session
connection
request
and
other
required
parameters.
The
TCP
Connection
Configuration
screen
also
allows
user
to
specify
authorized
masters
on
the
TCP
network.
TCP
Connection
Configuration
Window
Item
Value setting
Description
Listen
Port
1.
502
is
set
by
default
2.
Range
1
to
65535
Enter
the
listening
port.
TCP
Connection
Idle
Time
1.
300
is
set
by
default
2.
Range
1
to
65535
Enter
the
idle
timeout
in
seconds.
If
the
gateway
does
not
receive
another
TCP
request
before
the
idle
timeout
elapsed,
the
gateway
terminates
the
TCP
session.
Maximum
TCP
Connections
1.
4
is
set
by
default
2.
Range
1
to
4
Enter
the
allowed
maximum
simultaneous
TCP
connections.
TCP
Keep
‐
alive
Unchecked
by
default
Check
the
Enable
box
to
ensure
to
keep
the
TCP
session
connected.
Trust
IP
Access
1.
A
Must
fill
setting
2.
Allow
All
is
set
by
default
Specify
authorized
masters
on
the
TCP
network.
Select
Allow
All
to
allow
any
Modbus
Master
to
reach
the
attached
Slave(s).
Otherwise,
limit
only
specific
Master
to
reach
the
Slave(s)
by
selecting
Specific
IPs.
When
Specific
IPs
is
selected,
a
Trusted
IP
Definition
window
will
appear.
Refer
to
the
following
Trusted
Modbus
Master
sub
‐
section.
