
2
0
1
7
-0
5
10
Product
2
Product
2.1
Introduction
The HART
®
(Highway Addressable Remote Transducer) communication protocol 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.
Wireless
HART
®
technology now allows for the wireless transmission of HART
®
data. To be
employable worldwide,
Wireless
HART
®
technology utilizes the 2.4 GHz Band (IEEE 802.15.4
wireless network) as physical layer. All
Wireless
HART 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
Wireless
HART mesh network
The
Wireless
HART network is built up, organized and maintained by the
Wireless
HART
Gateway and is therefore self-organizing and self-healing. The
Wireless
HART Gateway also
takes care for connection to different host systems through different industrial protocol bus
interfaces.
The
Wireless
HART Gateway supplies
Wireless
HART Temperature Converters and
Wireless
HART Adapters with the necessary information for seamless network operation.
1
Wireless
HART Temperature Converter
2
Wireless
HART Adapter
3
Wireless
HART Gateway
4
Fieldbus/Ethernet
5
Host applications
1
2
3
4
5