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'[EE]:HART protocol'
2003\05\14@122654 by Alex

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Nobody responded to my last post, what am I doing wrong?"
Hi Pic-ers!
Is anybody here that works with HART protocole?
If yes please send me some links or some sample
code done with PIC.
Thanks in advance!

Alex




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2003\05\14@124930 by erholm (QAC)

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What is HART ?
Jan-Erik.

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2003\05\14@124935 by Tal

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I see your post
but can't help
Tal

-----Original Message-----
From: pic microcontroller discussion list [spam_OUTPICLISTTakeThisOuTspamMITVMA.MIT.EDU]On
Behalf Of Alex
Sent: Wednesday, May 14, 2003 7:23 PM
To: .....PICLISTKILLspamspam@spam@MITVMA.MIT.EDU
Subject: [EE]:HART protocol


Nobody responded to my last post, what am I doing wrong?"
Hi Pic-ers!
Is anybody here that works with HART protocole?
If yes please send me some links or some sample
code done with PIC.
Thanks in advance!

Alex




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2003\05\14@130809 by Alex

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-----Original Message-----
From:   Jan-erik Soderholm (QAC) [SMTP:Jan-erik.SoderholmspamKILLspamPAC.ERICSSON.SE]
Sent:   Wednesday, May 14, 2003 7:49 PM
To:     .....PICLISTKILLspamspam.....MITVMA.MIT.EDU
Subject:        Re: [EE]:HART protocol

What is HART ?
Jan-Erik.

HART is simultaneous analg(4-20mA) $ digital signals difrent freq. for "1" and "0".

Anyway thanks
Alex
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2003\05\14@131703 by

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All right, I found the http://www.hartcomm.org web page.

Anyway, I think the problem with your post was that
you begun with asking people to send you free code,
not that it was about HART as such...

And, no, I don't know anything about HART.

Jan-Erik.

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2003\05\14@132326 by Oliver Broad

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I think that the need to implement a modem puts many people off.

If I recall HART uses a very old frequency shift keying standard, and 300
baud maybe or is it slower?


{Original Message removed}

2003\05\14@143256 by alexburcea

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Hi
Thancks all end if you find more please anonce me, enithing is useful.
Sorry my english!

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2003\05\14@150758 by Olin Lathrop

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> Nobody responded to my last post,

That can happen for a number of reasons.  It's nobody's job to answer
questions here.  You are not owed an answer.

> what am I doing wrong?"

Bugging people after they clearly aren't interested in responding to your
first post.

> Is anybody here that works with HART protocole?

Personally, I have no idea what "HART" protocol is.  By the way,
"protocol" doesn't have an "e" on the end.


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2003\05\14@161645 by John Nall

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At 03:07 PM 5/14/2003 -0400, Olin wrote:

> >Personally, I have no idea what "HART" protocol is.  By the way,
>"protocol" doesn't have an "e" on the end.

Oh, come on now!  Chiding the guy is one thing -- carping about spelling by
someone who is not a native speaker of English is petty!   So long as the
word is understandable (which it is) that should not be a sticking
point.  Missed your afternoon cup of coffee?? :-)

John

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2003\05\14@165200 by Spehro Pefhany

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At 06:27 PM 5/14/2003 +0100, you wrote:
>I think that the need to implement a modem puts many people off.
>
>If I recall HART uses a very old frequency shift keying standard, and 300
>baud maybe or is it slower?

No, 1200 baud. Analog signal and digital and power simultaneously on 2
wires. It's really pretty simple, if a kludge.

I think the OP will have to join the HART foundation to get the
proper documents to design a conforming instrument.

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
EraseMEspeffspam_OUTspamTakeThisOuTinterlog.com             Info for manufacturers: http://www.trexon.com
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2003\05\14@165834 by Olin Lathrop

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John Nall wrote:
>>> Personally, I have no idea what "HART" protocol is.  By the way,
>> "protocol" doesn't have an "e" on the end.
>
> Oh, come on now!  Chiding the guy is one thing -- carping about
> spelling by someone who is not a native speaker of English is petty!
> So long as the word is understandable (which it is) that should not be
> a sticking
> point.  Missed your afternoon cup of coffee?? :-)

Whoa, Down boy!  Pointing out the correct spelling to a non-native english
speaker is hardly "carping".  Actually I thought it would help him.
Wouldn't you want to know if you spelled something wrong in another
language?  And, where did you get the notion from that it was a "sticking
point"?  I certainly never said nor implied that.  No, I don't drink
coffee, although I do drink an occasional diet Coke.


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2003\05\14@171141 by Lenihan.Eugene

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Wasn't the HART FOUNDATION a family of professional rasslers?

-----Original Message-----
From: Spehro Pefhany [speffspamspam_OUTINTERLOG.COM]
Sent: Wednesday, May 14, 2003 1:52 PM
To: @spam@PICLISTKILLspamspamMITVMA.MIT.EDU
Subject: Re: [EE]:HART protocol


At 06:27 PM 5/14/2003 +0100, you wrote:
>I think that the need to implement a modem puts many people off.
>
>If I recall HART uses a very old frequency shift keying standard, and 300
>baud maybe or is it slower?

No, 1200 baud. Analog signal and digital and power simultaneously on 2
wires. It's really pretty simple, if a kludge.

I think the OP will have to join the HART foundation to get the
proper documents to design a conforming instrument.

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the
reward"
KILLspamspeffKILLspamspaminterlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com

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2003\05\14@173323 by Bob Blick

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Olin Lathrop said:
> Personally, I have no idea what "HART" protocol is.  By the way,
> "protocol" doesn't have an "e" on the end.

Wow, two for two in the "getting paid to post to the piclist?" department.

If everyone responded to each message for which they had no idea, this
list would be BUSY!

Protocole is the correct spelling in some languages. Sort of the way
"colour" is a correct spelling in many places. It'd be one thing to
suggest to someone they say "power supply" instead of "alimentation de
puissance", but in this case it's just a regional difference in spelling,
not likely to lead to lack of understanding. I have better things to do
than reply to messages like this, and I'm sure you do too.

Of course by now even you know something about the HART protocol, and
perhaps a little French as well.

Cheerful regards,

Bob

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2003\05\14@181419 by Olin Lathrop

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> It'd be one thing to
> suggest to someone they say "power supply" instead of "alimentation de
> puissance",

I guess that's sortof like having to say "Viertopfzerknalltreipling"
because a word with "motor" in it wasn't german enough for the Nazis?


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2003\05\14@182644 by Spehro Pefhany

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At 01:55 PM 5/14/2003 -0700, you wrote:
>Wasn't the HART FOUNDATION a family of professional rasslers?

Dunno.. Is that a cattle rassler or a people rassler?

There was a store in a Simpson's episode called the
"Texas Cheesecake Repository". Maybe you had to be there..

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
RemoveMEspeffTakeThisOuTspaminterlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com

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2003\05\14@221252 by Richard Graziano

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HART Protocol is used in instrumentation systems such as signal
conditioners, calibrators, weight transmitters, temperature transmitters,
etc., typically in petro-chem tank farms or similar operations.  It is the
protocol, I believe, that allows hand held calibration computers to
interface with the instrumentation, transmitters, etc.for validation,
lockout-tagout and so on.
{Original Message removed}

2003\05\14@224945 by Tal

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I also don't know what HART protocol is ;-) but I do know SECS protocol
(seriously).

I think it stands for Semiconductor Equipment Control Standard and it is
and old protocol that supports various data abstractions over serial
link (similar to RPC/NDR).

I remember the surprise of new stuff members when the engineers start
talking about 'SECS'.

Tal

> {Original Message removed}

2003\05\15@035747 by Nigel Orr

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> Nobody responded to my last post, what am I doing wrong?"
> Hi Pic-ers!
> Is anybody here that works with HART protocole?
> If yes please send me some links or some sample
>  code done with PIC.
>  Thanks in advance!
>

I saw both your messages, but hadn't heard of HART before.  I was a bit
curious to find out about it so first stop, as ever, was google... you
might like to have a look at:

www.google.com/search?hl=en&lr=&ie=ISO-8859-1&q=HART+protocol+PIC&bt
nG=Google+Search

There are quite a few links, maybe you could come back with more specific
questions after reading them, and get more response?  It's quite possible
that no-one else on the list has used it, but could answer questions about
the specifics (eg how to generate 1200 baud FSK, how to interface to a
current loop)

(For others info, HART appears to be a protocol which superimposes 1200
baud FSK data on a 4-20mA current loop, for instrumentation control and
calibration.)

Nigel
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2003\05\15@044420 by dr. Imre Bartfai

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Hi,

Google gave me 72000+ hits at the first trial. I hope this helps.

Imre

On Wed, 14 May 2003, Alex wrote:

{Quote hidden}

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2003\05\15@100235 by Alex

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Hi Nigel,

Thanks for your help!
I used Google and I found the protocol.
Here USD500 it's a lot of money and I can't
buy a full documentation from the HART website.
Anyway I found the Google links and I think I can
do the rest. Now I work to the HART Modem with a PIC.

Thanks again and to everybody!


Alex



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