If we are talking about cables - how you use UTP cable? Let me explain
THere are 3 wires has to be used (or two in parasite mode- but in this case
it is not a question :) - what you use as a "stand alon" wire?
In my current installation I use a twisted pair for GND and Data, and use a
separate for VCC. I read the design document, but I cannot remember any
recommendation about the "orphan" wire...
(I use GND and Data twistid by the following logic: Data has to be in the
twist, no question. VCC is optional, so I left it alone...
Another option was to use the VCC and GND together in twist (as they are
similar), but they do not generate noise as they are constant voltages -
not like data...)
Am I good?
Plus - do you use any additional hardware filtering when a sensor is
connecting to the bus? Documentation mentiones a schottky diode and a
ferrit bed/resistor. Are they required for a 30m long bus, 15 sensors?
I would like to build a reliable, but easy bus.
Thanks!
On Thu, Oct 18, 2012 at 7:35 PM, Paul Alfille <paul.alfi...@gmail.com>wrote:
> According to wikipedia, there should be a (gentle) twist rate for each
> pair:
> http://en.wikipedia.org/wiki/Cat_5e#Category_5e
>
> Individual twist lengths
>
> By altering the length of each twist,
> crosstalk<http://en.wikipedia.org/wiki/Crosstalk_(electronics)>is reduced,
> without affecting the characteristic
> impedance
> <http://en.wikipedia.org/wiki/Characteristic_impedance>.[10]<http://en.wikipedia.org/wiki/Cat_5e#cite_note-prc88_cat5_turns-9>
> [*dubious <http://en.wikipedia.org/wiki/Wikipedia:Disputed_statement> –
> discuss<http://en.wikipedia.org/wiki/Talk:Category_5_cable#Individual_twist_lengths>
> *] The distance per twist is commonly referred to as pitch.
> Pair color [cm] per turn Turns per [m] Green 1.53 65.2 Blue 1.54
> 64.8 Orange 1.78 56.2 Brown 1.94 51.7
>
>
>
> Is it possible that you removed the twist when you stripped the outer
> covering?
>
> In any case, I suspect your cable will work for 1-wire.
>
> Paul Alfille
> On Thu, Oct 18, 2012 at 10:58 AM, Colin Law <clan...@googlemail.com>wrote:
>
>> On 18 October 2012 15:28, Markus Gaugusch <mar...@gaugusch.at> wrote:
>> > Hi Colin!
>> >
>> > On the image on your link, the wires are twisted ... but you say they
>> are
>> > not. Can you send us another image of your cable?
>>
>> Will the list allow attachements? If it will then here it is.
>> My question though is not so much whether it is the same as in the
>> picture but whether it can possibly be Cat5e if it is not twisted
>> pair.
>>
>> Colin
>>
>> >
>> > br,
>> > Markus
>> >
>> > On Oct 18, Colin Law <clan...@googlemail.com> wrote:
>> >
>> >> I saw that Cat5e ethernet cable is good for 1-wire so I bought 50m of
>> >> cable from an amazon shop [1]. When the cable arrived the cable outer
>> >> has printed on it PLUSCOM Cat5e UTP 4Pairs 24AWG Patch Cable. It does
>> >> not contain 4 twisted pairs, which I believe it should, but 8 separate
>> >> wires. Am I correct in thinking that it is therefore not Cat5e?
>> >>
>> >> Colin
>> >>
>> >> [1]
>> http://www.amazon.co.uk/gp/product/B008EELSPK/ref=oh_details_o03_s00_i00
>> >>
>> >>
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>> > --
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