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Interested in WirelessHART? Stay tuned for an announcement about a WiHART protocol stack from STG.
STG products among First ZigBee™ Certified Products Now Available
STG Announces 802.15.4 MAC Software Availability
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Sensor Network Infrastructure
802.15.4 Bridge
Router for ZigBee Networks
ZigBee is built on top of the IEEE 802.15.4 low power networking standard.
The 802.15.4 standard is a simple packet data protocol for lightweight wireless networks.
ZigBee adds key functionality on top of the core networking support provided by the IEEE 802.15.4 standard including support for peer to peer and mesh networking.
Simple packet frame structure: Mechanisms for devices to join and leave the network (Association and Disassociation)
Channel Access via Carrier Sense Multiple: Access with collision avoidance 64-bit IEEE-assigned addresses and a 16-bit short for network-specific address (similar to an IP address which is assigned to a device on a local network)
Network size of 264 nodes: Networks of up to several thousand devices are possible and practical
Message acknowledgement and optional beacon structure: Support for guaranteed time slice network access for QoS applications
Network Coordinator: Hands out addresses and coordinates the forming of the network as devices join and leave the network.
Full Function Device (FFD): Could be a sensor or control node but also provides packet routing and forwarding)
Reduced Function Device (RFD): Does not provide packet routing or forwarding, intended as a low cost node dedicated to a specific purpose such as sensing a condition or controlling a device)
Provides up to AES-128 level security at the physical layer
Allows for selectable latency for controllers, sensors, remote monitoring and portable electronics. When configured for maximum battery life, has the potential to last as long as the shelf life of many typical consumer batteries (for example, AAA, AA, or 9 volt battery).