Do you have a volt meter? The dimming light suggests that there is enough
of a short circuit to pull down power.

I'm a little unclear on the total picture.
1. You had a well functioning system.
2. Lightning strike took out a number of devices, including computers,
1-wire devices and masters.
3. You've replaced faulty devices, restored the same software setup and
versions, and tested the devices individually.
4. Adding a particular device (with a long cable run) causes all devices to
disappear from the 1-wire network.
5. You tried more than one master.

It still sounds like a hardware issue. I presume your 1-wire master is
bus-powered and that you have a powered hub for it. When all devices
disappear, is the 1-wire master still there?



On Sat, Jan 25, 2014 at 6:02 AM, Colin Tinker <colin.tin...@gmail.com>wrote:

>
> Paul
>
> I have checked all the cables with an RJ45 cable tester They are all straight 
> through no shorts all are 1 - 1, 2 - 2 etc.
>
> I have tested all the sensors on short 1 meter cables and thrown out the ones 
> which are faulty.  It does not matter what I plug in
> the devices disappear. as I say even a cable with nothing on it which is 
> straight through all devices disappear.
>
> The other thing I have noticed is when this happens the light on the linkUSB 
> stays on very dim even with an open ended cable.
>
> Colin
>
> This sounds like a hardware problem. My first suspicion is the cable --
> could it be shorted or the polartity reversed?
>
> On 24/01/14 12:01, Colin Tinker wrote:
>
> Hi
>
> I feel like I am banging my head against a wall with the problem I
> have.  3 weeks ago we had a lightning strike on the telephone cables in
> our village it too out a lot of kit for all of our village.  I lost my
> 1-wire USB adapter, a couple of temperature sensors, a dual counter, 2
> power supplies and my 2 homeplug adapters as well as my BT home hub and
> the BT face plate.
>
> My problem now is if I plug a cable longer than 2 meters into my new
> RPI2 interface via the temperature sensor in the lounge even with
> nothing on the other end, every device on the network disappears!!!!
>
> I have tried a LinkUSB interface with the same result, I have chnaged
> the Raspberry pi for a different one re installed the Rasbian image and
> owfs and the result is still the same.  All the cables have been swapped
> for ones not used during the strike although they all tested fine.  All
> the devices have been tested on short 1 meter cables all linked together
> and it all works fine.
>
> I have temperature sensors in every room with a weather station
> outside.  What should be there can be seen at http://www.g1gsw.org/ it
> will be slow as I awaiting for BT to resolve a slow connection.
>
> Help.
>
> Thanks
>
> Colin
>
>
>
>
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