I am planning to deploy a network of (approx 70) remote devices via
CAT5E cabling. It will carry 24Vdc as well as RS485 data at a low speed
(2400 baud at a guess).

I've selected the low baud rate so that I can get away with a mixed
topology (part daisy, part star) that the building layout imposes. The
longest cable run from the central controller should be less than 300
metres.

All of the terminations are via 'Phoenix style' 0.2" plug-in connectors.
To lessen the voltage drop on the 24Vdc wires, I plan to double them up.

It got me thinking that since there is still a spare pair in the cable,
should I double up on the comms as well? What are the implications of
having two balanced pairs in parallel, bearing in mind the low data rate?
David...

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David Duffy        Audio Visual Devices P/L
Unit 8, 10 Hook St, Capalaba 4157 Australia
Ph: +61 7 38235717      Fax: +61 7 38234717
Our Web Site: www.audiovisualdevices.com.au
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