Difference between revisions of "WirelessHART"
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https://en.wikipedia.org/wiki/WirelessHART<br> |
https://en.wikipedia.org/wiki/WirelessHART<br> |
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http://sourcetech411.com/2013/05/hart-protocol-for-communications-in-wireless-sensor-networks/<br> |
http://sourcetech411.com/2013/05/hart-protocol-for-communications-in-wireless-sensor-networks/<br> |
Revision as of 18:51, 11 April 2016
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.
Protocole | Standard & Fréquence standard | Exemples | Avantages | Désavantages |
Zigbee | IEEE 802.15.4ISM band 2.4GHz and 900MHz | 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. | 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. | 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) | 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. | 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 |
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/