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List: owfs-developers
Subject: Re: [Owfs-developers] industrial values
From: "Robert Conway" <rjconway () bigpond ! com>
Date: 2011-10-19 8:15:18
Message-ID: 001d01cc8e37$3ce07430$b6a15c90$ () bigpond ! com
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Hi Roberto,
An industrial standard for converting 4-20mA is to use a precision 250 ohm
resistor in series with the circuit. This provides a 1-5VDC voltage drop
across the resistor which is proportional to 4-20mA. 250 ohm resistors are
expensive so I generally use 4 x 1k resistors in parallel.
The industry uses a 4-20mA signal as it can typically be transmitted >2 klm
over a twisted pair cable and is not influenced by the resistance of the
signal wire.
Regards
Rob
Australia
From: Roberto Spadim [mailto:roberto@spadim.com.br]
Sent: Wednesday, 19 October 2011 1:47 PM
To: OWFS (One-wire file system) discussion and help
Subject: Re: [Owfs-developers] industrial values
ok paul, i will check some devices too, maxim have samples for it :D hehehe
2011/10/18 Paul Alfille <paul.alfille@gmail.com>
Look at http://owfs.org/index.php?page=voltage-measurement -- a table of the
voltage ranges for the different 1-wire slaves.
Current you read as voltage across a known (low) resistor.
On Tue, Oct 18, 2011 at 4:17 PM, Roberto Spadim <roberto@spadim.com.br>
wrote:
hi guys, another question....
how could i read industrial values?
0-20mA
4-20mA
0-10V
1-10V
--
Roberto Spadim
Spadim Technology / SPAEmpresarial
----------------------------------------------------------------------------
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--
All the data continuously generated in your IT infrastructure contains a
definitive record of customers, application performance, security
threats, fraudulent activity and more. Splunk takes this data and makes
sense of it. Business sense. IT sense. Common sense.
http://p.sf.net/sfu/splunk-d2d-oct
_______________________________________________
Owfs-developers mailing list
Owfs-developers@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/owfs-developers
--
Roberto Spadim
Spadim Technology / SPAEmpresarial
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class=WordSection1><p class=MsoNormal><span \
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Hi \
Roberto,<o:p></o:p></span></p><p class=MsoNormal><span \
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p \
class=MsoNormal><span \
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>An \
industrial standard for converting 4-20mA is to use a precision 250 ohm resistor in \
series with the circuit. This provides a 1-5VDC voltage drop across the \
resistor which is proportional to 4-20mA. 250 ohm resistors are expensive so I \
generally use 4 x 1k resistors in parallel.<o:p></o:p></span></p><p \
class=MsoNormal><span \
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p \
class=MsoNormal><span \
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>The \
industry uses a 4-20mA signal as it can typically be transmitted >2 klm over a \
twisted pair cable and is not influenced by the resistance of the signal \
wire.<o:p></o:p></span></p><p class=MsoNormal><span \
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p \
class=MsoNormal><span \
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Regards<o:p></o:p></span></p><p \
class=MsoNormal><span \
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p \
class=MsoNormal><span \
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Rob<o:p></o:p></span></p><p \
class=MsoNormal><span \
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Australia<o:p></o:p></span></p><p \
class=MsoNormal><span \
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p \
class=MsoNormal><b><span lang=EN-US \
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span \
lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Roberto Spadim \
[mailto:roberto@spadim.com.br] <br><b>Sent:</b> Wednesday, 19 October 2011 1:47 \
PM<br><b>To:</b> OWFS (One-wire file system) discussion and help<br><b>Subject:</b> \
Re: [Owfs-developers] industrial values<o:p></o:p></span></p><p \
class=MsoNormal><o:p> </o:p></p><p class=MsoNormal \
style='margin-bottom:12.0pt'>ok paul, i will check some devices too, maxim have \
samples for it :D hehehe<o:p></o:p></p><div><p class=MsoNormal>2011/10/18 Paul \
Alfille <<a href="mailto:paul.alfille@gmail.com">paul.alfille@gmail.com</a>><o:p></o:p></p><p \
class=MsoNormal>Look at <a \
href="http://owfs.org/index.php?page=voltage-measurement" \
target="_blank">http://owfs.org/index.php?page=voltage-measurement</a> -- a table of \
the voltage ranges for the different 1-wire slaves.<o:p></o:p></p><div><p \
class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal \
style='margin-bottom:12.0pt'>Current you read as voltage across a known (low) \
resistor.<o:p></o:p></p><div><div><div><p class=MsoNormal>On Tue, Oct 18, 2011 at \
4:17 PM, Roberto Spadim <<a href="mailto:roberto@spadim.com.br" \
target="_blank">roberto@spadim.com.br</a>> \
wrote:<o:p></o:p></p></div></div><blockquote style='border:none;border-left:solid \
#CCCCCC 1.0pt;padding:0cm 0cm 0cm \
6.0pt;margin-left:4.8pt;margin-right:0cm'><div><div><p class=MsoNormal \
style='margin-bottom:12.0pt'>hi guys, another question....<br>how could i read \
industrial values?<br><br>0-20mA<br>4-20mA<br>0-10V<br>1-10V<br clear=all><span \
style='color:#888888'><br>-- <br>Roberto Spadim<br>Spadim Technology / \
SPAEmpresarial</span><o:p></o:p></p></div></div><p class=MsoNormal \
style='margin-bottom:12.0pt'>------------------------------------------------------------------------------<br>All \
the data continuously generated in your IT infrastructure contains a<br>definitive \
record of customers, application performance, security<br>threats, fraudulent \
activity and more. Splunk takes this data and makes<br>sense of it. Business sense. \
IT sense. Common sense.<br><a href="http://p.sf.net/sfu/splunk-d2d-oct" \
target="_blank">http://p.sf.net/sfu/splunk-d2d-oct</a><br>_______________________________________________<br>Owfs-developers \
mailing list<br><a href="mailto:Owfs-developers@lists.sourceforge.net" \
target="_blank">Owfs-developers@lists.sourceforge.net</a><br><a \
href="https://lists.sourceforge.net/lists/listinfo/owfs-developers" \
target="_blank">https://lists.sourceforge.net/lists/listinfo/owfs-developers</a><o:p></o:p></p></blockquote></div><p \
class=MsoNormal><o:p> </o:p></p></div><p class=MsoNormal \
style='margin-bottom:12.0pt'><br>------------------------------------------------------------------------------<br>All \
the data continuously generated in your IT infrastructure contains a<br>definitive \
record of customers, application performance, security<br>threats, fraudulent \
activity and more. Splunk takes this data and makes<br>sense of it. Business sense. \
IT sense. Common sense.<br><a href="http://p.sf.net/sfu/splunk-d2d-oct" \
target="_blank">http://p.sf.net/sfu/splunk-d2d-oct</a><br>_______________________________________________<br>Owfs-developers \
mailing list<br><a href="mailto:Owfs-developers@lists.sourceforge.net">Owfs-developers@lists.sourceforge.net</a><br><a \
href="https://lists.sourceforge.net/lists/listinfo/owfs-developers" \
target="_blank">https://lists.sourceforge.net/lists/listinfo/owfs-developers</a><o:p></o:p></p></div><p \
class=MsoNormal><br><br clear=all><br>-- <br>Roberto Spadim<br>Spadim Technology / \
SPAEmpresarial<o:p></o:p></p></div></body></html>
------------------------------------------------------------------------------
All the data continuously generated in your IT infrastructure contains a
definitive record of customers, application performance, security
threats, fraudulent activity and more. Splunk takes this data and makes
sense of it. Business sense. IT sense. Common sense.
http://p.sf.net/sfu/splunk-d2d-oct
_______________________________________________
Owfs-developers mailing list
Owfs-developers@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/owfs-developers
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