I hear the term "HART" protocol, but only have a rough idea what it actually is. Is it in any way related to GPIB protocol?
would someone point to a reference that would give me some basic defintions and a protocol reference.
Yes, GPIB and HART are related, in the same way that any two network protocols are related. Certainly, GPIB and HART are both used primarily for analog data acquisition. The similarites end there, however.
Sage Automation, Inc.
HART is a 2-wire, current-loop communication link for instrumentation devices (pressure, flow, level, temperature.... transmitters). It can be used in Ex zones (undes certain conditions). Fisher-Rosemont, Invensys, Foxboro, and other manufacturers of field transmitters have joined to create the HartComm organisation; you can look at their weppage at:
Hope this helps,
There is an excellent book written by Romilly Bowden of Fisher Rosemount that describes HART in detail.
I have no idea what GBIB is but HART exists only over 4/20 mA loops, either superimposed over the 4/20mA in a point to point application or in a purely digital form for multi-drop applications (although applications of this are rare)
It's a digital communication system that is superimposed on 4-20mA signals for field devices... nothing to do with GPIB...... developed by Rosemount many years ago and made available to anyone. The HART Communication Foundation now has the rights.
hey! in what way is it just not related or hasn't anything to do with GPIB? could u give more clarification? may i know ur conceptual frame of mind about HART?
HART is not related to GPIB. HART in an enhancement to 4-20mA communication that allows two way digital communication with smart (i.e.,
microprocessor-based) field devices. If you will, HART field device simultaneosly support two communications channels: the 4-20mA communications and modulated two-way digital communications.
I will be glad to answer any questions about HART you have. In addition, there is abundant information about HART on our web site.
Wally Pratt (firstname.lastname@example.org)
HART Communication Foundation
Do you know of any protocol converter to get HART devices onto ethernet? A Linux based program is what I am looking for.
You might also want to check out "www.thehartbook.com":http://www.thehartbook.com it is an indpendant site that has detailed articles of HART technology and applications, it also has hundreds of products and pdf datasheets.