MB52XX Modbus Gateway
User Manual
Configuration
and
Setup
setting is needed, proceed to select
Basic Settings
→
VCOM Settings
and check the VCOM
’
s
“
Enable
”
box to allow
configuration on the selected TCP
’
s port of the Modbus Gateway device
.
VCOM Port
:
Using a TCP connection, the Modbus Gateway device
(
TCP server
)
listens to any TCP Clients
(
VCOM Clients
)
connecting
(
using Serial
-
IP
)
to its ports
.
The VCOM Port or the port of the TCP connection
can be configured as a number between 1 and 65535
.
The default VCOM Port number is 4660
.
Note
:
For Windows operating system, a Serial
/
IP software is required to use this feature
.
A restrictive
Serial
/
IP Redirector
software is installed
along with Atop
’
s
Device Management Utility®
.
The user can access the Serial
/
IP software through
Virtual COM
Serial
/
IP Tools
menu
.
Figure 4.11 VCOM Settings Web Page
VCOM Mode
:
This setting is a pull
-
down menu in which the user can select the
Operation Mode
of the devices
connected through this VCOM port as shown in
Its definition is the same to the one given in
Section 4.6.2
Here the user can choose whether device conforms to a RTU or an ASCII message format and
can select whether the device is either Modbus Slave node or Modbus Master Node
Figure 4.11 depicts the
RTU Slave
mode
.
So, the devices connected through VCOM 1 port will assume Modbus Slave role and
communicate using Modbus
/
RTU protocol
.
If a Master mode
(
either RTU or ASCII
)
is selected, the options for
the Master mode will be the same as the Slave mode
.
The only difference is the device
’
s function
.
Figure 4.12 Pull
-
down Menu of VCOM Mode
VCOM inactivity Time Out
:
This is a period of time allowed between actions
.
This setting can be set with a
maximum of 600 minutes
(
36000 seconds
)
or 10 hours
.
If there is no activity within this period, the VCOM
connection
(
TCP connection
)
will be automatically closed by the Modbus Gateway
.
These settings can be applied to All VCOMs if needed by checking the last checkbox on the options
highlights the checkbox for applying the settings to all VCOMs
.
