Standard field bus networks for industrial applications
Computer Standards & Interfaces
An Ethernet compatible protocol to support real time traffic and multimedia applications
Computer Networks and ISDN Systems
On the use of Ethernet at low level of factory communication systems
Computer Standards & Interfaces
Engineering Web Technologies for Embedded Applications
IEEE Internet Computing
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This paper deals with the feasibility of a compact and low-cost web-enabled sensor. A sensor can be interfaced to Ethernet using a low-cost microcontroller and few resources, as in fieldbus sensors. To realize a web sensor, Internet Protocols must be provided and most of the cost is in full-compliant implementation of these high-level protocols (Transfer Control Protocol/ Internet Protocol (TCP/IP) or Hyper Text Transfer Protocol (HTTP)). This approach allows access to the sensor from everywhere with a commercial browser instead of a proprietary interface. The proposed web sensor, which requires about 15 kbytes of C-code and 1 kbyte of Random Access Memory (RAM), supports IP fragmentation, manages two simultaneous TCP connections (one "fast" and one "slow") and exchanges information (web page) with commercial browsers.