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Modbus devices connected to EtherGate gateway show 65535 or 0 in ION Setup


A Modbus device is connected to ION Setup through an EtherGate gateway connection. Communications are established, but the meter menus are only displaying "65535" or "0" values, which correspond to an empty Modbus register.

Communications are established with the Modbus meter

Values in ION Setup menus display either 65535 or 0

Serial settings of gateway are set to EtherGate protocol

Product Line

  • Ethergate ION meters
  • Modbus meters


ION Setup v3.0


The IP port for the gateway is incorrectly set to 502. An Ethergate connection communicates through IP ports 780X, where X corresponds to the appropriate com port of the gateway.

IP Port of EtherGate gateway set to 502


Set the IP Port of the gateway to 780X, where X is the EtherGate com port.

Port changed to 7802, which corresponds to the EtherGate over Com 2

ION Setup menu displays meaningful values

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