There is a possibility with long cable runs that you can get capacitive
or inductive effects from other cables close by. It is normally only a
problem when running parallel and very close to high current power
cables, but maybe worth thinking about.
Do you have a spare long length of CAT5 that you could use to test? Just
leave it in a coil on the floor so it is not close to other cables and
see if that causes the same problem.
Still doesn't explain why it was working before though...
On 25/01/14 13:34, Paul Alfille wrote:
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
<mailto: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 athttp://www.g1gsw.org/ it
will be slow as I awaiting for BT to resolve a slow connection.
Help.
Thanks
Colin
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