Digi TransPort WR11 User Manual page 660

Configuring legacy protocols
Slave addresses/unit ids
The address of the slave unit.
Remote Host
The IP address of the remote host, such as the slave unit.
IP Port
The IP port number. The default port is 502.
IP Mode
Select the IP mode using this drop down list. The default mode is TCP.
Add
Adds the slave to the MODBUS configuration.
Digi TransPort® Routers User Guide
Configure a MODBUS gateway
660