Re: Cat5 pairs, RS232 and power

[ian.bird@xxxxxxx]

Pass on the best way to wire but I think I remember a while back Keith
worked out that a single pair of Cat5 wires carrying both +ve and -ve
would carry up to about 250 - 300ma safely. I remember this as my water
valves draw 230ma so I could get 7 of them on one cat5 cable as long as
they were only on one at a time. Best check the maths rather than rely on
my sketchy memory though. If you are using two pairs then no problems.
Don't forget distance has a bearing on the current calculation.

I _think_ because the power is DC the winding sequence on the pairs may be
irrelevant but I could also be completely wrong ;-))

Ian








"Paul Gale" <groups@xxxxxxx>
27/11/2003 13:02
Please respond to ukha_d


To:     <ukha_d@xxxxxxx>
cc:
Subject:        [ukha_d] Cat5 pairs, RS232 and power


Going to run an RS232 signal and 12V at 400mA through a single piece of
Cat5e.

To take advantage of the twisted nature of Cat5, should I be running Tx/Rx
on one pair or Tx/Gnd and Rx/Gnd on two pairs with the third pair carrying
+12V/Gnd?

What's best?

Paul.







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