Vega WHA-GW-WIRELESSHART GATEWAY User Manual download pdf (Page 10)

221981 2011-07

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 ... 5 6 7 8 9 10 11 12 13 14 15 ... 95 96

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Vega WHA-GW-WIRELESSHART GATEWAY User Manual Page 10