WirelessHART

WirelessHART est une technologie adaptée aux réseaux de capteurs basée sur le Highway Addressable Remote Transducer Protocol (HART)

Caractéristiques:

• Fiable même avec un fort bruit, grâce à sa topologie topologie "mesh", aux changement de chaîne, e.t aux messages synchronisés
• Sécurité et confidentialité des communications grâce aux chiffrement, authentification etc.
• Faible consommation adaptée aux appareils sur batteries, panneaux solaires etc.

Le protocole HART est basé sur 5 caractéristiques clés :

• Saut de fréquences
• Ajout automatique d'un noeud
• "Network formation"
• Topologie mesh
• Transferts de messages sécurisés

Ce protocole n'est qu'un protocole parmi les nombreux utilisés dans les réseaux de capteurs.

Protocol	Standard & Operating Frequency	Description	Example Modules	Advantages	Disadvantages
Zigbee	IEEE 802.15.4ISM band 2.4GHz and 900MHz	A mesh-networking standard for control and monitoring; building/home automation, embedded sensing. Distance range of up to 50 m.	NXP Panasonic	Low-cost, power efficient, easy solution for small networks. Use is widespread.	Cannot serve a high number of nodes within the specified period.
WirelessHART - Highway Addressable Remote Transducer Protocol	IEEE 802.15.4ISM band 2.4GHz.	A multi-vendor standard specifically designed for process monitoring and control; mesh networking with large numbers of sensors/nodes. Range is less than 100 feet.	Panasonic	Designated as an International standard. Built on a 30-year old HART technology. An accepted standard. Created specifically for industrial controls.	Not compatible with some existing wired protocols (FieldBus®, Profibus®, etc.)Up to 250 nodes on a network.
ISA-100.11a	IEEE 802.15.4ISM band 2.4GHz.	A multi-vendor standard for reliable and secure wireless connectivity for non-critical control and monitoring. Low-data-rate, very low power consumption. ISM band 2.4GHz. Range of 600m.	RFM Microchip Panasonic	Can scale above 250 nodes per network. An accepted standard. Created specifically for industrial controls. 600m range.	Not yet in wide use. Communicates with HART®, Fieldbus®, Modbus®, Profibus®.
Wi-Fi – Low power	IEEE 802.11a/b/g/n/ac2.4 GHz and 5GHz. (inconsistent worldwide)	Mature wireless standard developed for commercial/consumer use. Maximum distances from 100 – 200m.	Murata Microchip	Higher data rate.Mature technology; no bridges required to interface to the web.	Higher power consumption.
Bluetooth Low Energy	IEEE 802.15.1ISM band 2.4GHz.	Replaces serial connections like RS-232 and RS-485 and Ethernet over short distances (<100m)	Murata Panasonic	Compatible with large number of consumer devices. Low cost with high data rate(1 Mbit/s).	Consumes more power than 802.15.4 protocols, but less than 802.11

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Ressources : https://en.wikipedia.org/wiki/WirelessHART http://sourcetech411.com/2013/05/hart-protocol-for-communications-in-wireless-sensor-networks/ http://www.mouser.fr/applications/rf-sensor-networks/