22
1980
2010
-0
2
10
Product Specifications
2
Product Specifications
2.1
Introduction
The HART 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 has been using the wired 4 ... 20 mA loop
as physical layer.
WirelessHART now allows for the wireless transmission of HART data. To be employable
worldwide, WirelessHART 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 2.1: WirelessHART mesh network
1
WirelessHART field device
2
WirelessHART adapter
3
WirelessHART gateway
4
Fieldbus/Ethernet
5
Host applications
1
2
3
4
5
