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'[EE] RS-485 twisted pair'
2009\04\27@002639 by solarwind

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Does an RS-485 cable HAVE to be twisted pair?

-- [ solarwind ] -- http://solar-blogg.blogspot.com/

2009\04\27@004020 by Richard Prosser

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RS485 is a differential signal, so you want to minimise the noise
difference on the two wires. Twisting them together is the easiest way
of doing this as magnetically induced  interference tends to cancel,
and electric  field interference is turned into a common mode signal.
You don't _have_ to use twisted pairs, but if there is noise -
particularly magneticlly induced noise - then twisted pairs are the
safest bet.

RP

2009/4/27 solarwind <spam_OUTx.solarwind.xTakeThisOuTspamgmail.com>:
> Does an RS-485 cable HAVE to be twisted pair?
>
> -- [ solarwind ] -- http://solar-blogg.blogspot.com/
> -

2009\04\27@005307 by Xiaofan Chen

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On Mon, Apr 27, 2009 at 12:26 PM, solarwind <.....x.solarwind.xKILLspamspam@spam@gmail.com> wrote:
> Does an RS-485 cable HAVE to be twisted pair?

No you don't. In fact, I have device before me which use ribbon
cable and 16MHz RS485, the distance is not that long though.

The following guide is good. I have the PDF version printed for
reference.
http://www.bb-elec.com/tech_articles/rs422_485_app_note/table_of_contents.asp

--
Xiaofan http://mcuee.blogspot.com

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