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'one pin communication'
1999\01\03@225822 by Fernando Santos

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Hello all,

I need know the best way to communicate with one pin between more than 5

Pic's
"like a little network"  in a very noise environment.
Or must I make that in RS485 ?

How is the princip of the one pin communication with one Master and many

Slaves ?

Thank You

spam_OUTmop18932TakeThisOuTspammail.telepac.pt

1999\01\04@004823 by James Cameron

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Fernando Santos wrote:
> I need know the best way to communicate with one pin between more
> than 5 Pic's [...]

I don't know about the best way, but having just figured out the Dallas
one-wire protocol, I'd probably see if I could use that.

--
James Cameron                                      (.....cameronKILLspamspam@spam@stl.dec.com)

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1999\01\04@105107 by Roger Morella

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Check out Dallas Semiconductor.    You may be able to use a modified version
of their Micro-Lan protocol.  This is a link to an ap note in pdf format
http://www.dalsemi.com/DocControl/PDFs/app108.pdf


Fernando Santos wrote:

{Quote hidden}

1999\01\05@062127 by Dr. Imre Bartfai

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Hi,

can you tell us a reliable specification source for the Dallas 1-wire (TM)
protocol. I'm fascinated by it...
Imre


On Mon, 4 Jan 1999, James Cameron wrote:

{Quote hidden}

1999\01\05@065654 by Wolfgang Strobl

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On 4 Jan 99, 10:51  Roger Morella wrote:

> Check out Dallas Semiconductor.    You may be able to use a modified version
> of their Micro-Lan protocol.  This is a link to an ap note in pdf format
> http://www.dalsemi.com/DocControl/PDFs/app108.pdf

Hm.  There is a much more interesting application note 106
mentioned in the ds2437 documentation, but I couldn't find it in the
application note index. Does anybody out there have an idea why it
is missing? I asked their web master, but haven't got an answer,
yet.



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1999\01\05@071128 by Wolfgang Strobl

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On 4 Jan 99, 11:33  Dr. Imre Bartfai wrote:

> can you tell us a reliable specification source for the Dallas 1-wire (TM)
> protocol. I'm fascinated by it...

I believe most of their data sheets provide enough information to
implement it. I just wrote small test program which interfaces with
a handfull of 1820 sensors (using bare CCS C, with no assembly
interspersed), using just that info, and the program worked the first
time I tried it out.

There are two questions, though.

a) is there anything proprietary about that protocol, besides the
trademark? While it might be easy to come up with a
nonproprietary version, one would prefer to follow their specs to the
bit, if only for being able to mix different devices on the same "1-
wire".

b) if there is a satisfactory answer to a) - what about the so called
"family code"? It would certainly be nice to know which family
codes NOT to use.

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1999\01\05@073647 by Nigel Orr

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At 11:33 04/01/99 +0100, you wrote:
>can you tell us a reliable specification source for the Dallas 1-wire (TM)
>protocol. I'm fascinated by it...

It's called microLAN, details are at http:\\http://www.ibutton.com (or via
http://www.dalsemi.com)- they have lots of pdf files!

ibuttons are the little metal cases that some of the 1-wire devices are
supplied in.

Nigel

1999\01\05@081257 by Philippe

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At 11:33 04/01/99 +0100, you wrote:
>can you tell us a reliable specification source for the Dallas 1-wire (TM)
>protocol. I'm fascinated by it...


Go at http://www.dalsemi.com for PDF file on 1-Wire device
and try UMPS example on DS1821 and PIC16C84: 1-wire protocol and CRC source
are in the example.

Regards,
       Philippe.

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1999\01\05@083343 by Gerry Cox

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Wolfgang,

I have it on the Dallas CD-ROM.
It title is 'Complex Microlans'and it is 117 Kilobytes in the Acrobat PDF
format.
I'll post it on to you or anyone that mails me privately.

Regards,
Gerry Cox
Weymouth, Dorset, U.K.


-----Original Message-----
From: Wolfgang Strobl [KILLspamwsKILLspamspamGMD.DE]
Sent: 05 January 1999 11:46
To: RemoveMEPICLISTTakeThisOuTspamMITVMA.MIT.EDU
Subject: Re: one pin communication


Hm.  There is a much more interesting application note 106
mentioned in the ds2437 documentation, but I couldn't find it in the
application note index. Does anybody out there have an idea why it
is missing? I asked their web master, but haven't got an answer,
yet.

1999\01\05@084558 by Roger Morella

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Check out Dallas Semiconductor.    You may be able to use a modified version

of their Micro-Lan protocol.  This is a link to an ap note in pdf format.
There are others on their web site that also contain information about
Micro-Lan.
http://www.dalsemi.com/DocControl/PDFs/app108.pdf

Roger

Fernando Santos wrote:

{Quote hidden}

1999\01\07@074329 by Dr. Imre Bartfai

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Hi Folks,

many thanks to all for the advices. The app108.pdf was too general for me,
however technical details could be found in 1990a.pdf. The protocol is
really admireable.

Imre

1999\01\14@231812 by jcline

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Check out the ibutton protocol created by dallas.  It supports
many devices on the 'bus' (which is one line).  Also called the
1-wire protocol.  Basically it defines valid data times for the
master & slaves.

{Quote hidden}

Jonathan
RemoveMEjclinespamTakeThisOuTee.calpoly.edu

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