Just as a minor point, your wiring of the RJ45's is non-standard
See 1wire.org under "open standards"
Paul Alfille
On Dec 16, 2007 5:49 AM, Tilman Glotzner <[EMAIL PROTECTED]> wrote:
>
>
> I just post the message again as it is displayed as attachment in the
> mailing list. Hope it gets represented accurately without the attachment of
> the PDF containing the schematic. The previous posting has the schematic of
> my dS2480B design attached....
>
>
>
> >This is one of the difficult cases of 'it works for me, but not you.'
> >I just tested an authentic DS9097U
>
>
> >I guess the first question is do you have other proof that your adapter
> >functions correctly?
> I don't of course :-)
>
> I setup 2 of the identical PCBs. Both of them do not work. One
> of them I checked with an oscilloscope.
> 1) The TX signal from the RS232 is correctly transfered to the
> DS2480B.TheDS2480B is
> not answering however.
> 2) Then I played with the polarity pin. Tying POL to high changes the
> output voltage of on RX on
> the DS2480B, but still does not yield a response.
> 3) I never observed any activity on the 1 wire bus.
>
> I came up with the following scenarios:
> 1) There is an systematic error in the circuitry. Hence both of them do
> not work
> 2) The DS2480B of both PCBs is broken
> 3) The DS2480B of the PCB I scrutenized with the oscilloscope is broken.
> The other PCB
> has a fabrication issue (like a soldering joint not producing an
> electrical contact)
> 4) OWFS might have an issue with DS2480B.
> 5) Supply voltage insufficient
>
> (5) The measured supply voltage is close to 5 V. That should be fine.
> (4) I understand that the DS9097U uses the DS2480B, and works fine with
> OWFS.
> (2) This I find unlikely
> (3) I lost my probes for the oscilloscope. Hence I can currently not
> validate (3) and measure the signals
> on the second PCB as well.
> (1) This is the most likely scenario. There is however Michael's circuit
> a) Michael has a similar circuit to mine and the DS9097U
> b) Michael receives the same error messages from OWFS
> c) Looking at the data sheet of DS2480B, I do not find any mistakes in
> the circuitry -- neither in Michael's nor in mine. I attached it -- please
> have a look yourself.
>
> Thanks
> Tilman
>
>
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