LonTalk is a protocol optimized for control created by Echelon Corporation for networking devices over media such as twisted pair, powerlines, fiber optics, and RF. It is popular for the automation of various functions in industrial control, home automation, transportation, and buildings systems such as lighting and HVAC; see Intelligent building.

LonTalk is part of the technology platform called LonWorks.

LonTalk is defined by ANSI Standard ANSI/CEA 709.1. The LonTalk protocol has been ratified by standards setting bodies in the following industries & regions:

  • ANSI 709.1 - Control networking (US)
  • EN 14908 - Building controls (EU)
  • GB/Z 20177.1-2006 - Control networking and building controls (China)
  • IEEE 1473-L - Train controls (US)
  • SEMI E54 - Semiconductor manufacturing equipment sensors & actuators (US
  • IFSF - International forecourt standard for EU petrol stations

The protocol is only available from the official distribution organizations of each regional standards body or in the form of microprocessors manufactured by companies that have ported the standard to their respective chip designs.

ee also

* BACnet -- A gateway-to-gateway protocol supported by ASHRAE that is being supplanted by standardized web services such as oBix. LonTalk will continue to be used for device-to-device communication, with these standardized web services connecting together these LonWorks systems.
* LonTalk is not to be confused with LocalTalk, although both run over twisted pair telephone cable.


* [http://www.echelon.com/ Echelon Corporation Homepage]
* [http://www.geocities.com/lonsite/protocol.html LonTalk Protocol information from Harold's World of LON]
* [http://global.ihs.com/doc_detail.cfm?item_s_key=00391891&item_key_date=971131&rid=CEA Global Engineering Documents (purchase the current EIA, non-ANSI, specification document for EIA/CEA 709.1]

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