A is another device that is not mine, and that I have to access to=20
figure out.  I have to treat it as a black box.  B and C I have access=20
to.  The RS232 link between A and C is just 2 wires.  We did have some=20
noise issues there when the person with the truck significantly=20
lengthened the wires (from approx 2ft to 13 ft), and swapping to=20
shielded wires resolved that.  They are adamant that they can't relocate=20
and shorten things.

The power conditioning should not be cleaning up the ground side=20
though.  What would be a good way to correct that if necessary?  I would=20
think that tying all grounds to the same point would be best, but not=20
sure if the extra wire length to do so would be worse then using the=20
closest chassis grounds.

Cheers,
-Neil.


On 11/13/2014 10:56 AM, alan.b.pearce@stfc.ac.uk wrote:
> That would certainly be a concern, but I would also wonder why device=20
> A is not fed from the output side of the power conditioner instead of=20
> the input side. The possibility of noise then being injected into=20
> device C via the ground of the Rs232 link between A and C should not=20
> be overlooked.=20

--=20
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