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Reference Manual
00809-0200-4420, Rev HC
Section 5: Operation and Maintenance
July 2015
Operation and Maintenance
5.4 Modbus
The Gateway supports both Modbus RTU over the RS-485 serial port and Modbus TCP over
Ethernet. It functions as a sub device on the Modbus network and must be polled by a Modbus
master or client (host system).
5.4.1 Communication settings
It is import that the Modbus communication settings in the Gateway match the setting in the
Modbus master or client. Refer to host system documentation for more information on how to
configure these settings. The Modbus communication settings can be found by navigating to
System Settings>Protocols>Modbus.
Figure 5-5. Modbus Communications Page
One Modbus Address: When this option is selected, this address is used by the Gateway for
Modbus RTU communications.
Multiple Modbus Addresses: When this option is selected, a new column for address will
appear on the Modbus mapping page.
Modbus TCP Port: This is the TCP/IP port the Gateway uses for Modbus TCP (Ethernet). To
change TCP/IP port settings, see the Internal Firewall section for more details.
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