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In a follow up to that, my readings for the serial port levels are:
        DTR: -4.23
        TXD: -4.91
        RXD: -4.57
Shouldn't they be -12 to +12?

Chris

Christopher Malton wrote:
> OK, so I was using the 25 pin diagram, and translating the pin IDs.
> That didn't work.  Sadly, neither does the 9 pin one.  Same result,
> 0.35V between Data and Gnd.
> 
> The 9 pin one I have built on an breadboard first for checking, before
> soldering.  Again it is picked up by OWFS, but the problem seems to be
> in the circuit somewhere!
> 
> If anyone has ANY ideas, please let me know.  Otherwise I will just go
> and buy the Maxim USB or Serial adaptor.
> 
> Chris
> 
> Paul Alfille wrote:
>> I've built the circuit myself. After a few awkward soldering attempts, it
>> did work. In fact it's been in use continuously over a year.
> 
>> So my first suggestion is to just test the voltages, with no devices
>> attached. The data line should be 5V higher than the ground.
> 
>> Second, make sure you are attaching the DS1990A with the correct polarity.
> 
>> After that, there is always the issue of correct ports, etc. The fact you
>> have different responses depending on what is attached suggests you have
>> chosen correctly.
> 
>> Please report on your progress.
> 
>> Paul Alfille
> 
>> On 8/22/06, Christopher Malton <[EMAIL PROTECTED]> wrote:
>> Hello,
>>         I recently bought the parts for a 1-Wire adaptor (the DS9097),
>> and
>> assembled using the diagram on your site:
>>         http://owfs.sourceforge.net/adapters.html
>> The real problem comes reading any chip from it.  No matter how hard I
>> try, it fails to read my DS1990A iButton!
> 
>> Using OWHTTPD, it sits there for about 10 seconds refreshing the bus.0
>> page, with the DS1990A, and without the DS1990A a mere millisecond.
> 
>> Do you have any suggestions as to a fix to solve this?
> 
> 
>> Chris
>>>
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>> -------------------------------------------------------------------------
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- -------------------------------------------------------------------------
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