Wireless HART

 

 

WIRELESS HART MODULE FOR WiWIZ1

 

Wireless HART Module

Introduction


The WiWiz1- WiHART module is a fully compliant with the Wireless HART standard (IEC/PAS 62591 wireless HART international standard). The Wireless HART module is an option for the WiWIZ1 development board. . Because of its small form factor and extremely low power consumption, it is a perfect choice for battery powered devices.. The WiWiz1-WiHART module incorporates a 2.4GHz radio, protocol processor, wireless HART stack, real-time clock, crypto accelerator, and power management.

 

Wireless HART module features

 

1) Low power consumption

2) Extended transmit performance (1 mile+ range possible) with 100mW RF output and appropriate external antennas

3) On-board temperature compensated oscillator for TDMA-based protocol support (alternate 32KHz crystal option available) including external access to temperature compensated signal (TXCO-based modules only)

4) Dual antenna support for antenna diversity and multipath interference resistance with two on-module U.FL antenna connections; external antenna connections support “deep embedding” inside devices offering maximum integration flexibility and module mounting options without concern as to RF performance resulting from location of the module

5) Rich mix of digital, analog, and communications  I/O capabilities including SPI and I2C buses plus two UARTs (one with hardware flow control)

6) Strategically located ground connections for reduced EMI and improved signal integrity

7) Supports 16 RF channels operating in the 2.4GHz ISM band for worldwide unlicensed operation

8) 32-bit ARM7 processor core for high performance processing power with on-chip 128K FLASH, 96K RAM, and 80K ROM

9) Additional 1 MB on-board Flash memory for support of OTA (Over The Air) updating or local data storage capability

10) On chip 128-bit AES encryption processor support

Operational Considerations

The Wireless HART module is a communication processor and interacts with the auxiliary applications on the WiWIZ1. All RF communication is accomplished by sending and receiving information from the module. A software API is available so that the user can write software to communicate with the module. All applications and data acquisition is performed by the Atmel microprocessor using the freely available development environment. Through the utilization of the communication API information is sent and received from the communication module.

NETWORK ARCHITECTURE

 

Wireless HART enables deployment of easy to use reliable and interoperable wireless mesh networks.

Wireless HART specifies three principle elements:

Wireless HART Field Devices (WFD) that are connected to the Process or to Plant Equipment.

Wireless HART Gateways that enable communication between Host Applications and

WFDs in the Wireless HART Network. Gateways support one or more Access Points.

A Gateway and its Access Points must included in every Wireless HART network.

 

A Wireless Hart Network Manager that is responsible for configuration of the network, scheduling communication between Wireless HART devices (e.g. configuring superframes), management of the routing tables and monitoring and reporting the health of the Wireless HART Network.  While redundant network managers are supported, there must be only one active Network Manager per Wireless HART Network.

 

In addition, Wireless HART supports: 


• Wireless HART Adapters that allow existing HART field devices to be integrated into a Wireless HART Network.

Wireless HART Handhelds support direct access to adjacent Wireless HART field devices using its embedded Wireless HART transceiver.


Wireless HART devices support all that users have come to expect from HART including HART's rigorous and high standards of interoperability.   All Wireless HART equipment consist of core mandatory capabilities that will allow equivalent device types to be exchanged without compromising system operation. To this end the majority of WirelessHART requirements are mandatory and must be universally supported.

 

Wireless HART Networking


 

 

For More Information Go Here

http://www.hartcomm.org/protocol/wihart/wireless_technology.html

 

A copy of the standard can be purchased here:  http://webstore.iec.ch




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