VEGA WHA-GW-WIRELESSHART GATEWAY - Manual (Page 10)

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2011
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WHA-GW-*
Product Specifications
2 Product Specifications
2.1 Introduction
The HART
®
communication protocol (Highway Addressable Remote Transducer) is used
by many 4 ... 20 mA transmitters to enable digital communication for diagnosis and
maintenance purposes. Many device parameters, but also measurement values, can be
transmitted digitally to and from the device. Until now, HART
®
technology has mostly been
using the wired 4 ... 20 mA loop as physical layer.
WirelessHART
®
technology now allows for the wireless transmission of HART
®
data. To be
employable worldwide, WirelessHART
®
technology utilizes the 2.4GHz Band (IEEE
802.15.4 wireless network) as physical layer. All WirelessHART devices form a mesh
network in which every device is not just a measurement point, but also a repeater. This
results in a bigger range of the whole network as well as an increased reliability through
redundant communication paths.
Figure 2.1WirelessHART mesh network
1 WirelessHART field device
2 WirelessHART adapter
3 WirelessHART Gateway
4 Fieldbus/Ethernet
5 Host applications
1
2
3
4
5