Of Operation 2

Where To Get More Information 52
What Information is Available? 52
Where to Find Information 52
By Mail 52
By Phone 52
By Fax 52
By E-mail 52
Online 52
Appendix A: HART Checklist 53
HART Host System Capabilities Checklist 53
Appendix B: HART Revision 5 56
Universal Commands in HART Revision 5 56
Appendix C: HART Revisions 2, 3, and 4 58
Universal Commands in HART Revisions 2, 3, and 4 (Differences from Revision 5) 58
These commands did not exist before Revision 5.0 59
Appendix D: Common Practice Commands 60
Common Practice Commands 60
Appendix E: Response Codes 65
Status 65
Response Codes 65
First Byte 65
Second Byte 66
Appendix F: HART Field Control 67
HART Field Controller Installation 67
Appendix G: Technical Information 69
Communication Signals 69
Data Information 69
Simple Command Structure 69
Communication Masters 69
Variables 69
Wiring Topologies 69
Cable Lengths 69
Intrinsically Safe 69
Glossary 71

HART APPLICATION GUIDE

Preface

In today’s competitive environment, all companies seek to reduce operation costs, deliver products rapidly, and improve product quality. The HART^® (highway addressable remote transducer) protocol directly contributes to these business goals by providing cost savings in:

• 
  Commissioning and installation
  
• 
  Plant operations and improved quality
  
• 
  Maintenance
  

The HART Application Guide has been created by the HART Communication Foundation (HCF) to provide users of HART products with the information necessary to obtain the full benefits of HART digital instrumentation. The HART communication protocol is an open standard owned by the more than 100 member companies in the HCF. Products that use the HART protocol to provide both analog 4–20 mA and digital signals provide flexibility not available with any other communication technology.
The following four sections provide you with an understanding of how the HART technology works, insight on how to apply various features of the technology, and specific examples of applications implemented by HART protocol users around the world:

• 
  Theory of Operation
  
• 
  Benefits of HART Communication
  
• 
  Getting the Most from HART Systems
  
• 
  Industry Applications