Page 148 IM02601004E www.eaton.8 Setup on the Web Server PagesCONFIGURING MODBUS COMMUNICATIONSWhen Modbus/TCP is enabled, it can be configured to accept connections from either all clientsor trusted clients. You can set this by entering the IP address mask. The X.X.X.X setting ac-cepts all connections; however, you can also use the mask to accept connections from any clientwithin a given subnet. For example, 192.168.X.X allows connections from any client in the subnet192.168.0.0 to 192.168.254.254.You can also use the meter as a gateway to a Modbus subnet and the Ethernet/LAN Setup pageprovides settings for configuring the gateway. Either RS-485 serial port can be configured as theconnection to the subnet; however, there are some tuning considerations, which are covered later,that may affect the choice of port. Either of the two RS-485 ports, or the RS-232 port, can be desig-nated Master-Gateway and Master-IO. These can be designated as such on the Com 1 & 2 SetupEdit page, and the Com 3 Setup page.MODBUS TUNINGModbus clients can respond differently to polling commands and may require additional time torespond. Also, the meter may need to attempt to poll a device multiple times as it may be in a statethat does not allow it to immediately reply and therefore exceed the timeout value. You can usethese settings to configure your the meter to accommodate the various requirements of the deviceson the subnet.If there will be a high level of polling traffic, you should seriously consider having the Display Linkon a separate RS485 port from the Modbus subnet. A high level of polling traffic can degrade
