A network adaptor is disclosed that uses Power over Ethernet (PoE) protocols to derive power from an Ethernet port and provide the derived power to a field device. The network adapter communicates analog data with the field device and converts the analog data to digital data using an analog to digital converter before transmitting the digital data through the Ethernet port to a central office. The network adapter is uniquely assigned to the field device allowing an IP address to be assigned to the network adapter/field device system which may be accessed using IP protocols from any suitable browser.