ETnet: WattsOn Ethernet Management Gateway

The ETnet module is an internet interface for the WattsOn device. It provides a dynamic AJAX-enabled web-interface to configure the device and display real-time readings from the WattsOn Universal Power Transducer. The ETnet can also send data collected by the WattsOn to a web server via HTTP POST at regular intervals, using a highly configurable template-based format -- it can be configured to use XML, JSON, CSV, or any custom format. The ETnet will also store a backlog of data in the event of a network outage to ensure any post information is not lost due to network or server outages.

While the ETnet was designed to give internet-based monitoring and data reporting capabilities to WattsOn devices, it also functions as a general purpose Modbus/TCP to Modbus/RTU bridge, so that it can be used with existing Modbus aware software and devices. A WattsOn device can be connected directly to the ETnet's RS-485 serial port or through an external Modbus/TCP to Modbus/RTU gateway over the network.

The ETnet supports DHCP, BOOTP and AUTOIP. A Windows® utility is used to detect and configure the network parameters from a Windows PC. In addition to the web interface allows for full device configuration.