The ModbusTcpGatewayDevice represents a Modbus serial (RTU or ASCII) device on the “far side” of a ModbusTcpGateway (network), for TCP client access by the station (acting as Modbus master). In addition to the typical device components, it specifies its Modbus address plus other settings, including slots to specify the base address for its Modbus data items (holding registers, input registers, inputs, coils), and a DevicePollConfigTable for device polling.

Its Points extension (ModbusClientPointDeviceExt) contains Modbus proxy points with client proxy extensions (ModbusClientBooleanProxyExt, ModbusClientNumericProxyExt, ModbusClientRegisterBitProxyExt), used to read and write data to the defined data items. The device can also contain one or more ModbusClientStringRecord components.

For more details, see About Modbus client devices.