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RE: Re: Wanted - two pair cable for 12VDC and RS485
- Subject: RE: Re: Wanted - two pair cable for 12VDC and
RS485
- From: "Keith Doxey" <ukha@xxxxxxxxxxx>
- Date: Fri, 24 Jun 2005 20:53:08 +0100
> From: ukha_d@xxxxxxx [mailto:ukha_d@xxxxxxx]On Behalf Of
> Neil Fuller
>
> >>in fact, a screen is likely to bedetrimental to performance
IMO.
>
> When we use RS485 to shift data around buildings (which often have
high
> amounts of EMI from VSDs etc), we always use STP. Why would a screen
be
> detrimental to performance?
>
Hi Neil
It probably wont affect RS485 too much if the speed is quite low but
screened cable has a much higher capacitance so therefore greater losses.
HTH
Keith
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