RS-485 likes 120 ohm impedance cable. CAT5 is that and is generally a
good choice for RS-485. RS-485 is differential signaling, so make sure
that you use a single pair for A (D-) and B (D+). Your C (common) can be
any other wire.
Belden Data-tuff is good stuff. Midnite Solar also apparently sells 600
volt rated CAT5e.
Shielding is helpful, but probably isn't necessary.
Termination resistors are essential. Follow the manufacturers
recommendations on these.
Good luck,
-James Jarvis
APRS World, LLC
On 5/14/2014 7:40 PM, will...@millersolar.com wrote:
Friends:
I am connecting up some RS485 cards in Sunny Boys and Sunny Islands.
Can I use Cat5 wire for that? It is supposed to be shielded which
standard Cat5 is not. As usual, 600 volt rating would be preferable.
Anyone have a source?
Maybe this is another use for the Belden Data-tuff wire. It is shielded
if memory serves me correctly.
Thanks for the input.
William
Gradient Cap_mini
Lic 773985
millersolar.com <http://www.millersolar.com/>
805-438-5600
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+1-507-454-2727
www.aprsworld.com
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