>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.The DS2480B 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 _________________________________________________________________ Express yourself instantly with MSN Messenger! Download today it's FREE! http://messenger.msn.click-url.com/go/onm00200471ave/direct/01/
Converter2_sch.pdf
Description: Adobe PDF document
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