On Wed, Oct 23, 2013 at 11:05:19AM +0800, Andrew Elwell wrote:
> > I would move the power to the other end of the cable if possible (you
> > could use a 5V wallwart at the computer end and run it through a
> > separate pair, with just a cap on the remote end).  Better if you can
> > put the wallwart at the remote end too (minimise crosstalk).
> 
> ah OK - so make the Vcc a 'loop'? hadn't thought about that.
> 
> In my case it's all powered via a PoE splitter
> (http://www.tp-link.com.au/products/details/?categoryid=234&model=TL-POE10R
> ) which drives a headless raspberry-pi @5v with a DS2482-100 hanging
> off the I2C bus (http://www.sheepwalkelectronics.co.uk/RPI2.shtml) -
> sadly no chance of a wall-wart to the area (hence why all coming off a
> PoE feed)

Ok, well good luck, lots of ground wires, but don't try more than 1
signal/data line because you'll get multipath echoy things.  Btw,
there are tiny 5v to 5v dc isolators available for about $10 I think,
which could help.

njh

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