A blog from Navigant Research (formerly Pike Research) on wireless building controls standards included this graphic and the VERY interesting words quoted below:
The ZigBee Alliance was founded in 2002 to develop an open standard for wireless sensor networking, with commercial building automation a key application target. While market attention has focused on an Internet Protocol (IP) version of ZigBee for Smart Energy (i.e., smart meter and home area networks), other groups quietly, steadily, and quite slowly, inched toward a ZigBee implementation for commercial building control systems.
It took more than 10 years and several detours, but the working groups ultimately adapted the popular BACnet building control protocols to the proven ZigBee PRO networking stack to deliver a mesh networking solution that most industry participants are now embracing . . .
Ultimately, a long, multi-vendor effort has produced an acceptable general wireless standard that spans lighting, HVAC, fire & safety, and security & access building controls systems.
AND
The EnOcean specifications have emerged by a completely different path that started from a proprietary single-vendor product set targeting a specific problem; it subsequently opened up to multiple vendors and a broader solution space. EnOcean GmbH was spun out in 2001 from Siemens AG as a provider of self-powered wireless lighting controls, whereby the energy inherent in physically toggling a light switch is harvested to power wireless communications to the lighting system. This avoids the battery maintenance problem associated with battery-based wireless switches.
EnOcean the company initiated the creation of an industry alliance, and though the technology has been accepted as a ISO/IEC standard, the underlying technology remains essentially sourced by a single vendor. Yet, the EnOcean solution has garnered broad industry support and customer acceptance, particularly in Europe – enough to cause the ZigBee Alliance to develop a similar energy harvesting specification.
Source: http://electricalcontractor.com/?p=9537
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