30
Reference Manual
00809-0200-4410, Rev BC
Host Integration
July 2017
Host Integration
Figure 5-4. 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.
Baud Rate: The data rate or speed of serial communications. This setting is only required for Modbus
RTU.
Parity: This setting determines parity (none, even, or odd) to use for error checking purposes. This
setting is only required for Modbus RTU.
Stop Bits: This setting determines the number (1 or 2) of stop bits to use when ending a message. This
setting is only required for Modbus RTU.
Response delay time (ms): This setting determines how long (ms) the Gateway waits before
responding to a Modbus request. This setting is only required for Modbus RTU.
Unmapped register read response?: This is the value returned by the Gateway if the Modbus master
requests a register with no data assigned to it (empty register). It is recommended this be set to zero fill
to prevent errors.
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