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About Lynxspring Wireless Mesh Networks
The Lynxspring wireless card (VWG-APP-1020 ) and related wireless thermostat family (VT7xxxXxxxxW)
networkable devices operate using ZigBee/IEEE 802.15.4 physical layer for communication.
General characteristics of the wireless physical communication layer are:
• Uses a wireless physical layer of 2.4GHz with a data rates of 250 kbps
• Yields high throughput and low latency
• Automatic multiple topologies configuration: star, peer-to-peer, mesh
• Fully handshake protocol for transfer reliability
• Range: 30 feet / 10M typical (up to 100 feet / 30 M based on environment)
IEEE 802.15.4 along with ZigBee Networks and Application Support Layer provide:
• Low cost installation deployment
• Ease of implementation
• Reliable data transfer
• Short range operation
• Very low power consumption
• Appropriate levels of security
The JENE with the wireless communication card acts as network coordinator device for the IEEE
802.15.4/ZigBee network used with the Lynxspring wireless thermostats.
Many network specific features of the IEEE 802.15.4 standard are not covered in detail in this paper. However,
these are necessary for the efficient operation of a ZigBee network. These features of the network physical layer
include receiver energy detection, link quality indication and clear channel assessment. Both contention-based
and contention-free channel access methods are supported with a maximum packet size of 128 bytes, which
includes a variable payload up to 104 bytes. Also employed are 64-bit IEEE and 16-bit short addressing,
supporting over 65,000 nodes per network. All those properties of the physical layer are used and employed by
the Lynxspring mesh network but are hidden to the installed / user for ease of configuration and commissioning of
the network database.
A “recommended” typical maximum of 30
networkable thermostats can be supported by a single JENE2.
Database creation and configuration is easily made using the Niagara AX
®
environment.
The theoretical maximum of number of thermostats supported by a single JENE is dependent on the resources
available for the WirelessStatNetwork driver Jar file and the extent of integration added to the station itself. When
additional functions and services are added to the station, the available resources for the driver will be less. Once
you have configured the station for the wireless network and all other features (graphics, services, histories,
alarms, etc.), you should monitor the resources so that they do not exceed the recommended limits for each
specific platform.
Wireless Card Installation
Please refer to the “Wireless Communication Card Installation” manual supplied with the VWG-APP-1020
communication card for detailed information on the wireless communication card installation inside a JENE
controller.
Only use Com1 option slot card position for the card
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