Wireless HART Standard

Wireless Standard – Wireless HART

 

This document is designed as a very brief introduction to the Wireless HART protocol standard. The link page points to additional websites where more information is available.

The Wireless HART standard was developed under the auspices of the HART Foundation (www.hartcomm.org). The original HART (Highway Addressable Remote Transducer) Protocol was developed by Rosemount as a wired protocol based on the utilization of the Bell 202 modem sending digital data on the  4-20ma wire used for communication with field sensors. The wireless HART protocol was added to the original wired HART standard. The wireless HART standard is also an international standard (IEC/PAS 62591Ed. 1) and is publicly available.

Introduction

Wireless HART operates in the 2.4 Gigahertz band using the IEEE 802.15.4 radio standard with direct sequence spread spectrum communication. The standard was primarily established for use in process control applications but it can be used in more generalized applications.  In addition wireless HART uses TDMA (Time Division Multiple Access) to transmit information. TDMA assigns slots in the communication channel for data transmission and reception of data. The standard also utilizes a frequency hopping technique to minimize interference on the network. The standard defines 12 channels.

The network organization allows every node to be a router and wireless HART is a peer to peer mesh. It is not an ad hoc network in the sense it requires both a centralized network manager and security manager. The Network Manager is responsible for configuring the network, scheduling communications between devices, managing message routes, and monitoring network health.

For a complete and comprehensive analysis of Wireless HART the HART foundation website is an excellent source of information. (www.hartcomm.org)

For additional information regarding Wireless HART implementations please examine app notes pages and/or go to our contact page and request information.

 

 

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