Moxa Technologies MGate MB3000 Modbus, User Manual, Page: 59 / 89

MGate MB3000 Modbus Gateway User Manual 59
With priority control, you can specify that certain requests are sent to the front of the queue for more
immediate response times. Priority requests can be specified by master (IP address or serial port), TCP port,
or command type (slave ID, function code, or data). When the Modbus gateway identifies a priority request,
the request will immediately be placed at the front of the queue.
To define a priority request, enable the appropriate priority scheme (i.e., Specified Masters, Specified
TCP Port , or Specified Requests ). Then, specify the parameter(s) that will indicate a priority request.
Finally, click Add/Modify to apply this definition. (This last step is not necessary for Specified TCP Port .)
For example, if you want all requests from 192.168.32.161 to be considered a priority request, you would
follow these steps:
1. Enable Specified Masters .
2. Enter 192.168.32.161 as the IP .
3. Click Add/Modify .
System Settings
Accessible IP
The MGate MB3000 uses an IP address-based filtering method to control access to itself.
The Accessible IP List function allows you to add or block remote host IP addresses to prevent unauthorized
access. Access to the MGate MB3000 is controlled by IP address. That is, if a host’s IP address is in the
accessible IP table, then the host will be allowed to access the MGate MB3000. The different restrictions are
listed in the table below (the checkbox
Apply additional restrictions can only be activated if Activate the
accessible IP list is activated.
Activate the
accessible IP list Apply additional
restrictions IPs on the list
(Active checked) IPs NOT on the list
(Active NOT checked)

–
All protocol communication
and services* are allowed.
Protocol communication is not
allowed, but services* are still
allowed.
 
All protocol communication
and services* are allowed.
All services* are not allowed.
*Services indicate HTTP, HTTPS, TELNET, SSL, SNMP, SMTP, DNS, NTP, DSU