Moxa Technologies MGate MB3000 Modbus, User Manual, Page: 54 / 89

MGate MB3000 Modbus Gateway User Manual 54
Port Routing Table
The MGate MB3000 gateways support two kinds of port routing mechanism: by IP address and by TCP
port . The Modbus master can communicate with the Modbus slave devices connected to a specific serial
port on the gateway by assigning an IP address or TCP port to the specified serial port. Under these two
kinds of port routing mechanisms, each serial port can be accessed by up to four Modbus masters.
For example, you could assign TCP ports 2001 to 2004 to serial ports 1 to 4, respectively. When the
gateway receives a Modbus request designated for TCP port 2001, it will forward the Modbus request to
serial port 1 directly. Similarly, if it receives a Modbus request designated for TCP port 2004, it will forward
the Modbus request to the serial port 4 directly.
The MGate MB3000 gateways can forward the Modbus requests from different IP addresses to a specific
serial port. For example, if IP address 192.168.1.1 is assigned to serial port 1, and when the gateway
receives a Modbus request sent to 192.168.1.1, the gateway will forward the Modbus request to serial port
1 directly.